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1. 2 10 Figure 2 4 External Devices Only 2 10 Figure2 5 SCSILEDConnedor 2 14 Figure 2 6 Connecting Cabletolnternal Connedor 2 17 Figure 2 7 Connecting Cable to SCSI Device 2 17 Figure 2 8 Connecting a Second Internal SCSI Device 2 18 Figure 2 9 Connecting External Cable to Host Adapter 2 19 Figure 2 10 Connecting External Cable to SCSI Device 2 19 Figure 2 11 Connecting Multiple External SCSI Devices 2 20 Figure 2 12 Connecting Floppy Cable to Host Adapter 2 21 Figure 2 13 Connecting Floppy Cableto Floppy Drive 2 22 Figure 2 14 Connecting a Second Floppy Drive 2 22 Figure 3 1 Host Adapter Parameters 3 5 Figure 3 2 Selecting nterrupt Level 3 6 Figure 3 3 Selecting Bus ReleaseTime 3 7 Figure 3 4 Selecting Data FIFO Threshold 3 7 Figure 3 5 Selecting Host Adapter BIOS Base Address 3 8 Figure 3 6 Selecting Host Adapter SCSI ID 3 9 Figure 3 7 Selecting SCSI Bus Parity 3 10 Figure 3 8 Selecting SCSI Selection Timeout 3 11 Figure 3 9 Selecting SCSI Bus Reset at Power on 3 11 Figure 3 10 Configuring SCSI Bus Termination 3 12 Figure 3 11 BIOS and Device Configuration 3 12 Figure 3 12 BIOS Configuration Selection 3 13 Figure 3 13 SCSI DeviceConfiguration 3 15 Figure 3 14
2. 1 8 Adaptec Technical Support 1 9 H Getting Started About This Chapter 2 1 Installation Overview 2 3 The Host Adapter and the SCSI Bus 2 4 Quick Installation 2 5 Prepare Your SCSI Devices 2 5 Install Your Host Adapter and Peripherals 2 6 Configure the Host Adapter 2 7 Installations ed epee a Pack aes 2 8 Termination on the SCSI Bus 2 9 SCSI ID Seftting 2 12 Board Installation 2 13 V Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 v Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual SCSI Bus Activity LED Connector 2 14 Conneding Peripherals 2 15 Before Re booting Your System 2 23 Reassemble the System 2 23 Configuring the HostAdapter About This Chapter 3 1 The EISA Configuration Utility 3 3 Run the EISA Configuration Utility 3 4 Copy Configuration and Overlay Files 3 4 Select the Host Adapter 3 4 Configure the Host Adapter Parameters 3 5
3. 1 5 Board Layout sensum La dte res anda a MANG kang maa 1 6 Default Settings 1 7 The On board Floppy Controller AHA 2742 2742T Only 1 8 Unpacking and Inspedion 1 8 Adaptec Technical Support 1 9 H Getting Started About This Chapter 2 1 Installation Overview 2 3 The Host Adapter and the SCSI Bus 2 4 Quick Installation 2 5 Prepare Your SCSI Devices 2 5 Install Your Host Adapter and Peripherals 2 6 Configure the Host Adapter 2 7 Installations ed epee a Pack aes 2 8 Termination on the SCSI Bus 2 9 SCSI ID Seftting 2 12 Board Installation 2 13 V Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 v Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual SCSI Bus Activity LED Connector 2 14 Conneding Peripherals 2 15 Before Re booting Your System 2 23 Reassemble the System 2 23 Configuring the HostAdapter About This Chapter 3 1 The EISA Configuration Uti
4. Figure 3 L Host Adapter Parameters Note If your host adapter is an AHA 2740T 2742T a set of parameters for SCSI Channel B is displayed and can be configured Configure the Host Adapter Parameters Use the cursor keys and or function keys as instructed on the Screen s menu to move between each parameter or to select and configure each parameter Intenupt Level Select Interrupt Level to configure the interrupt channel IRQ used by the host adapter Figure 3 2 displays your choices The default setting is IRQ 11 Multiple AHA 2740 Series host adapters installed in your system can share the same RQ however to increase system perfor mance you may want to select a different IRQ for each host adapter installed 3 5 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 5 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 r 1 e mi m m m m m iu m m m i m mr m i cm a Em rm m ee Da m mim A eae AHA 2740 Series User s Manual Note The IRQ cannot be shared with ISA mode SCSI host adapters such as the Adaptec AHA 1540 and AH A 1520 Series adapters If those adapters are installed in your EISA system they must be assigned unique IRQs Host Adapter Interface Definitions Interrupt Level Done F10 Edit Resources F6 gt lt Cancel ESC gt Figure 3 2 Selecting Interrupt Level Bus Release Time Sele
5. 3 18 C 4 STA a RA e ete ena mec ee a 9 1 3 Signal refledtion 9000000 ee 2 4 Spedfications avare Xaya yay Kl a bida A 1 A 7 Staticeledridty 1 8 2 13 Synchronous negotiation 3 16 C 3 Tapedrives oea ous yo R A b RI ER ela il 2 12 Task scheduling 1 4 Index 6 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 6 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 Las a a Ti mm m m D Tedhnicalsupport 1 9 4 3 Termination See SCSI termination Transfer rate See Data transfer Translation schemes 3 14 Troubleshooting 4 1 4 7 TwinCharnnel lake satur AE N pd s 2 4 Unpacking and inspecting 1 8 D tlibies s ias Lures tetto tna ab m asc us A 3 19 Adaptec EZ SESI my mile Du dalla e Russe eR tease B 4 disk format Ad ee tue tad Pact a 3 20 4 4 host adapter diagnostics 3 21 low level format 3 20 4 4 4 5 D 1 D 5 WINdOWS eee a EC PA rede edes E B 3 C 5 O Index 7 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 7 Print Spec Number 491709 00 Rev C Current Date
6. 04h Hardware error The disk drive may be defective Consult the hardware documentation and contad the manufacturer 05h Illegal request The Adaptec formatting utility does not support a low level format of this device The device may already be low level formatted by the manufacturer This error rarely occurs 4 5 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 4 5 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 4 6 AHA 2740 Series User s Manual 06h Data protect The removable media may be write protected Remove write protection and run the utility again TheAdditional Sense Code field provides more information about the error The meaning of these codes may be listed in your hardware manual My computer locks up when press Esc to exit the EISA Configuration utility If this happens turn your machine off and then on to reboot Any settings you changed before you tried to exit the program have been registered in the EEPROM and will not be lost One of the SCSI devices on my system does not allow termination to be disabled How can l attach it to the SCSI bus You might beable to attach this device on the end of the SCSI bus so you donat need to disable termination on it If this is not possible contact the manufacturer about possible work arounds I installed my host adapter board at IRQ12 and it does not work properly What is wrong Anoth
7. Each AHA 2740 Series host adapter is equipped with an FCC compliancelabel which shows only the FCC identification number Thefull text of the assodated label follows This device complies with part 15 of the FCC rules Operation is subject to the follow ingtwo conditions 1 this device may nc cause harmful interference and 2 this device must accept any interference received induding interferencethat may cause undesired operation m mmm al aa E 1 Adaptec 2740 Series User s Manual Stock Number 510381 00 Rev C Page O iii Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 iv Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 e Table of Contents Preface InsideThis Manual xi Conventions x cedet da e beer e eiii ren e xii Advisories sele B ep NI eee ia xiii H Introduction About This Chapter 1 1 a setae Shi ER ED RR EE 1 3 The AHA 2740 Series of Host Adapters 1 3 e N E wa nw Ce a Rr RE e mr eon ERE 1 4 Fast Data Transfer Rates 1 4 Maximum Off loading the Host CPU 1 4 Fully Disk Array Capable 1 5 Advanced Fast SCSI 2 Implementation 1 5 Multiple Device and Applications Support
8. Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 km mmn m mim m mm m m im rie mm RUR sn i mmm Em m xm m R ns min m i c Index E ladp7771 cfg configurationfile 2 7 EY Adaptec EZ SCSIL a Ad ana B 4 C 5 Address See Base address adp7770 ovl overlay file 2 7 1 701 configuration dilp 1 7 AIC 7770 bus master SCSI diip 1 7 Arbitrationphase 2 12 ASPI manager sz A DA B 4 Asynchronous negotiation 3 16 B Base addressi a a eR et ik eee 1 7 3 8 4 7 BCLKS See Bus dock B OS eure BAN DEM EE US ERA EXRORUETA S 1 7 base address 1 7 3 8 4 3 4 7 config rati on su ek are erga bh ape e ek Rn 3 12 3 13 CE aa v pier a dez a e C 3 error if device not found 3 18 extended translation support 3 14 D 1 D 5 indude in BIOS scan 3 17 partitioningsupport 1 6 removable disk drive 3 13 3 17 support for more than twodrives 3 14 Board layout zc ia ei heed epee UNLAD ANG 1 6 EE 1 7 4 4 Booting your system 3 18 C 4 Bullet
9. AHA 2740 Series User s Manual Host Adapter BIOS Base Address Select Host Adapter BIOS Base Address to configure the BIOS base address for the host adapter or to disable the host adapter BIOS Figure 3 5 displays your choices The default setting is a base address of D8000h When choosing the base address verify that there is no conflict with other devices using the same address often the Configura tion utility will notify you if thereis a conflict Note The BIOS must be enabled in order to boot from a SCSI fixed disk drive attached to the host adapter BIOS Definitions Host Adapter BIOS Base Address Done F10 Edit Resources F6 gt lt Cancel ESC gt Figure3 5 Selecting Host Adapter BIOS Base Address 3 8 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 8 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Configuring the Host Ada pter Host Adapter SCSI ID Select Host Adapter SCSI ID to configurethe SCSI ID 0 7 setting for the host adapter Figure 3 6 displays your choices The default setting is 7 Each installed SCSI device must have a unique SCSI ID SCSI ID 7 is normally assigned to the host adapter SCSI IDs O and 1 should be reserved for SCSI hard disk drives If two host adapters are installed each would have its own SCSI bus thus each host adapter would stil
10. E AHA 2740 Series User s Manual Hoppy Disk Interface Standard Electronic and Physical Interface Table A 6 Output and Input Signals Driver Output Signals E Receiver Input Sionals 1 0 volts maximum 1 4 volts minimum Tied to 45 volt supply through 150 ohm resistors Schmitt Trigger with 0 8 volt hysteresis Connector Thefloppy disk interface connector should be an unshrouded 34 pin header O A 8 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 8 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 O Operating Environment About This Appendix Read this appendix to find out e f embedded support for your host adapter is available with your operating system e Whether or not you need additional software for your host adapter in the DOS Windows envi ronment e Information on Adaptecs EZ SCSI I O Operating Environment Software that makes driver installation easier than ever before B 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page B 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page B 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 Host Adapter Support Y ou may not need to install additional environment software in order to use your ho
11. Most problems that might occur during installation can betraced to errors in preparing devices on the SCSI bus The following suggestions should help you to solve any problems that you may encounter If you need additional help in getting the host adapter running properly information on contacting Adaptec Technical Support is included in Chapter 1 ntroduction If a problem occurs during installation check these items first 1 Besureall SCSI peripheral devices are conneded to power Connect internal peripherals to your computer s power sup ply plug external peripheral power cables into a grounded line power outlet Follow the instructions in the hardware documentation 2 Besureall cables are properly connected Check both power and SCSI interface cables See Installation in Chapter 2 3 Besurethe SCSI devices and host adapter on each SCSI bus are each set to different SCSI IDs See SCSI ID Setingin Chapter 2 4 Check SCSI bus termination The ends of the bus must be terminated See Termination on theSCSI Bus in Chapter 2 5 Ifyou have installed more than one SCSI host adapter make sure that each host adapter is set to a separate BIOS address or disablethe BIOS on all but one of the host adapters See Configurethe Host Adapter Parameters in Chapter 3 If your problem is still not resolved continue with the next sedion 43 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 4 3 Prin
12. the basic steps indude Run the EISA Configuration utility Copy the configuration and overlay files e Select the host adapter e Configurethe host adapter parameters e Configure BIOS and SCSI device e Exit the EISA Configuration utility Note Thescreens displayed in this chapter may vary from the screens dis played by the EISA Configuration utility supplied with your system 3 3 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 3 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual Run the EISA Configuration Utility Run the El SA Configuration utility as instructed by the EISA system vendor Place the bootable EISA configuration diskette in an operative drive and reset the system to boot from this diskette If you have the Configuration utility installed on your hard disk reboot your system and run the utility from your hard disk After booting with the host adapter installed ignore any error that indicates that an unknown board has been detected in the system Copy Configuration and Overlay Files The adp7771 cfg configuration file and adp7770 ovl overlay file needed to configure your host adapter with your EISA system are located on the diskette that came with your host adapter The EISA Configuration utility typically allows you to select among a number of options induding copying new configuration files Select
13. tion regardless of whether extended translation is enabled What if I have more than two fixed disk drives on the host adapter You can use up to seven fixed disk drives under the BIOS provided you are running DOS 5 0 What if use older versions of software drivers when extended translation is enabled To protect your data the host adapter will lock out any driver that does not identify itself as capable of extended translation If you need to use software that is not compatible with extended translation do not enable extended translation 3 D 5 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page D 5 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page D 6 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Glossary About This Glossary Read this glossary tofind out e Definitions of technical terms used in this manual e Definitions of terms commonly used in other documents and publications which discuss the SCSI to microcomputer peripheral connection Glossary 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 S amemus minem m mule iu nin Q nm n m m m m a lal mb Adaptec AHA 2740 Series User s Manual Stock Number
14. 1 PerformanceTips C 3 Enabling Synchronous Negotiation C 3 Disabling the Host Adapter BIOS C 3 E nabling SCSI Bus Parity C 4 Setting Enable Disconnection C 4 Send Start Unit Command C 4 DOS Windows Performance C 5 Disk Drives Over 1 Gigabyte AboutThisAppendix D 1 Extended Translation Using DOS 5 0 D 3 The DOS 1 Gigabyte Limit D 3 When to Use Extended Translation D 4 With DOS Version 5On y D 4 Drives VVith Mixed Partitions D 4 Using FISK oos a Gah Gov e s GE RA Pere e a a D 4 Questions and Answers About Extended Translation D 5 Glossary AboutThisGlossary Glossary 1 GIGSS APY ct uoa rem we ees doe be eta Glossary 3 Index had aida te tele am lde ndex 1 vii Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page O vii Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 viii AHA 2740 Series User s Manual List of Figures Figure 1 1 Host Adapter Board Layout 1 6 Figure 2 1 Connectors on the Host Adapter 2 8 Figure 2 2 Internal and External Devices 2 9 Figure 2 3 Internal Devices Only
15. 1 93 ECN Date 9 14 93 Specifications About This Appendix Read this appendix to find out e Technical specifications of the AHA 2740 Series host adapter EISA interface SCSI interface and floppy disk interface e Pinassignments for the internal and external SCSI connectors A 1 gl is A 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Rosin mmm m mm m s ue mm nn m i m em s m mm cs nm mn E Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Technical Information The basictechnical specifications of the host adapter are described below If you need more detailed information contact Adaptec s Literature Department at the address or phone numbers listed in Chapter 1 Introduction Product Spec ific ations Physical Dimensions Length 7 0 inches Width 0 625 inches Height 5 0 inches Standard EI SA compatible form factor Power Requirements 45 0 0 25 Volts at 2 0 Amps maximum Environmental Requirements Temperature 0 55 C operating or storage A 3 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 3 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Rosin mmm A ier PA nn m em s m m
16. 9 1 93 ECN Date 9 14 93 a m m l f mm mu n ia AHA 2740 Series User s Manual Synchronous Data Transfer Negotiati on The message exchange between the initiator and the target that allows the negotiation of the data transfer frequency and delay be tween requests and acknowledgments requi red for synchronous data transfer Once negotiated synchronous data transfer parame ters remain unchanged until certain re initialization activities occur Tagged Queuing A SCSI 2 feature that allows the SCSI deviceto return data in a different order than requested by the SCSI host adapter Target or Target Device A SCSI devicethat performs an operation requested by an initiator Thetarget may be a peripheral device such as a disk drive perform ing a servicefor an initiator The target may also be a host adapter performi ng a processor type device service for an initiator Termination A physical requirement of the SCSI bus The devices at the physi cal ends of the SCSI bus must have terminating resistors either installed or enabled devices in the middle of the bus must have terminating resistors either removed or disabled Word A 2 byte 16 bit unit of data Zero Latency Reads A Method of minimizing mechanical limitations of fixed disk by requesting data in an unordered sequence The data is reordered by the host adapter O Glossary 12 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 12
17. D 3 drives vvith mixed partitions D 4 extended translation 1 7 D 1 D 5 low level format 3 20 4 4 removable disk drive 1 7 3 13 3 17 4 6 See also SCSI device SES aaa e M os ua 2 12 support for more than tvvodrives 1 7 3 14 translation schemes 3 14 verify disk media 3 20 Host adapter BIOS See BIOS Host adapter diagnostics 3 21 See Utilities Host adapter support oo 0000000 3 3 B 3 ul I O operating environment B 1 D 4 DOS Windows B 3 C 5 ID See SCSI ID Initiate syncnegotiation 3 16 Installation forexperiencedusers eee 2 5 fOr n eW USerS acc e pies E Saad AURA EA a ce 2 8 hest adapter is cai ed deg darkest edges 2 6 2 13 din d de oka d 2 3 SCSI deviae Lk bida bpm sik LER elen 2 6 Interrupt evel aker nnne mI IE REST Kel 1 7 3 5 See alsolRQ IRO Lact iT 07 RC EAE ANA 1 7 3 5 4 6 4 7 CONTIICES WIED SN 4 6 Index 4 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 Las dim
18. ECN Date 9 14 93 Configuring the Host Ada pter Configuration Setting for SCSI Devices 1x8 Channel A Device ID 0 1 2 3 4 5 6 7 Enable Disconnection yes yes yes yes yes yes yes yes Initiate Sync Negotiation yes yes yes yes yes yes yes yes Maximum Sync Xfer Rate 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 Include in BIOS Scan yes yes yes yes yes yes yes yes Error if Device Not Found no no no no no no no no Send Start Unit Command no no no no no no no no OK lt ESC gt lt DEFAULT gt Figure 3 13 SCSI Device Configuration Enable Disconnection This option is used to determine whether or not the host adapter will allow a SCSI device to disconnect from the SCSI bus some times referred to as disconnect reconnect This allows the host adapter to perform other operations on the SCSI bus whilethe SCSI deviceis temporarily disconnected When set to yes the SCSI device may disconnect from the SCSI bus The SCSI device however may choose not to disconnect even if allowed to by the host adapter this is usually configurable on the SCSI device When set to no the SCSI device will not be allowed to disconned from the SCSI bus The default setting is yes In general disconnect should be allowed for the most effi dent SCSI bus utilization and highest overall system performance If only one SCSI deviceis attached to the SCSI host adapter discon necs are not required for efficient SCSI bus utilization since o
19. Exiting SCSI Device Configuration 3 19 Figure 3 15 Utility Seledion 3 20 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 viii Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Table of Contents List of Tables Table1 1 HostAdapterComponents 1 7 Table 1 2 Host Adapter Default Settings 1 7 Table 2 1 SCSI Device and AHA Configuration 2 9 Table A 1 Standard EI SA Bus Electronic and Physical Interface A 4 Table A 2 Output Signals A 4 Table A 3 Input Signals A 5 Table A 4 Internal Connector Pin Assignments A 6 Table A 5 External Connector Pin Assignments A 7 Table A 6 Output and Input Signals A 8 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page O ix Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 x Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93
20. Figure 3 10 Configuring SCSI Bus Termination 3 12 Figure 3 11 BIOS and Device Configuration 3 12 Figure 3 12 BIOS Configuration Selection 3 13 Figure 3 13 SCSI DeviceConfiguration 3 15 Figure 3 14 Exiting SCSI Device Configuration 3 19 Figure 3 15 Utility Seledion 3 20 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 viii Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Table of Contents List of Tables Table1 1 HostAdapterComponents 1 7 Table 1 2 Host Adapter Default Settings 1 7 Table 2 1 SCSI Device and AHA Configuration 2 9 Table A 1 Standard EI SA Bus Electronic and Physical Interface A 4 Table A 2 Output Signals A 4 Table A 3 Input Signals A 5 Table A 4 Internal Connector Pin Assignments A 6 Table A 5 External Connector Pin Assignments A 7 Table A 6 Output and Input Signals A 8 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page O ix Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 x Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Prefac
21. Host A microcomputer system in which a host adapter is installed The host uses software to request the services of the host adapter in transferring information to and from peripheral devices attached tothe SCSI host adapter Host Adapter A printed circuit board or integrated drcuit that installs in a standard microcomputer system and provides a SCSI bus connec tion sothat SCSI devices can be connected to the microcomputer IBM PC AT Compatible Any computer system that emulates exactly the BM PC AT and that uses an ISA backplane bus Industry Standard Architecture SeelSA Initiator A SCSI device that requests an operation to be performed by another SCSI device the target Theinitiator provides all the command information and parameters required to perform the operation but the details of the operation are actually sequenced by the target The host adapter is sometimes called the initiator Glossary 7 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 7 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 a m m l f mun m nal nil AHA 2740 Series User s Manual VO Operating Environment Software Additional software that may be required in certain operating sys tem environments in order to use some kinds of SCSI devices with the AHA 2740 Series of host adapters For example addi tional software is needed in order toinstall CD ROM drives on the SCSI bus
22. Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual Installation This section is intended primarily for users who are new to SCSI peripherals or have limited experience in installing an option board in their computer system Note Experienced users may want to refer to the Quick nstallation sedion described earlier in this chapter The comprehensive instructions in this section guide you through terminating the SCSI bus settingthe SCSI ID installing the host adapter and connecting peripherals and cables Oncethe host adapter is properly installed in your EISA system you will haveto configureit as explained in Chapter 3 Configuring the Host Adapter Toassist you with installation Figure 2 1 shows the location of all the connectors on the host adapter EXTERNAL LED FLOPPY CONNECTOR SCSI CHANNEL A CONNECTOR AHA 2740T 2742T ONLY INTERNAL CONNECTOR 1 1 A A PIN 1 B PIN 1 PIN 1 SCSI CHANNEL B INTERNAL CONNECTOR SCSI CHANNEL A AHA 2740T 2742T ONLY EXTERNAL CONNECTOR Figure 2 1 Connectors on the Host Adapter 2 8 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 8 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 1 ii min nim ii m d m mi mk im im m ei m i m TR R Sm m Term
23. Termination to enable or disable SCSI termination on the host adapter Figure 3 10 displays your choices The default setting is enabled Host adapter termination should be disabled only if you attach SCSI devices to both internal and external connectors since the host adapter would then bein the middle of the SCSI bus Refer to Chapter 2 Getting Started for information on termination SCSI Channel A Configuration SCSI Bus Termination Enabled Disabled Done F10 Edit Resources F6 lt Cancel ESC gt Figure 3 10 Configuring SCSI Bus Termination BIOS and Device Configuration Select BIOS and Device Configuration to configurethe BIOS and SCSI device options Figure 3 11 displays your choices BIOS and Device Configuration BIOS configuration Device configuration lt ESC gt Figure 3 11 BIOS and Device Configuration 3 12 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 12 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 1 a m BR B eS Configuring the Host Ada pter BIOS Configuration BIOS Configuration allows you to configure the host adapter BIOS Figure 3 12 displays your choices Usethe cursor keys to move between options To toggle values for each option press the Enter key BIOS Configuration This configuration
24. disk s media for defects If bad blocks are found you are prompted to reassign them Host Adapter Diagnostic Utility This utility runs a diagnostic on your host adapter by doing DMA transfers between the SCSI host adapter and system memory This test will run indefinitely until Esc is pressed O 3 21 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 21 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 22 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 4 Troubleshooting About This Chapter Read this chapter tofind out Howtousethetroubleshooting checklist to diagnose prob lems that may occur when you install a host adapter in your system e Problems you may encounter and how to fix them e How toresolve conflicts with other options 4 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 4 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 4 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 4 SCSI Troubleshooting Checklist The AHA 2740 Series has been extensively tested for compatibil ity with popular SCSI peripheral devices across various operating systems
25. extension of the 16 bit ISA bus standard allows expansion devices like network cards video adapters and modems to transfer data across the PC bus 32 bits at a time This standard was introduced in 1988 EISA Configuration The operation of configuring a device on the EISA bus through accessing registers in the device by the host This replaces the method of using jumpers commonly found on ISA bus devices EPROM Erasable Programmable Read Only Memory An integrated circuit used to store the host adapter BIOS and firmware EZ SCSI See Adaptec EZ SCSI FIFO First In First Out A queuing order in which items are removed from the queue for execution in the same order in which they are placed in the queue An integrated circuit that buffers data in Glossary 6 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 6 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 hz mmn m mim m mim m m mm Em mm See ee mim ee Glossary such a manner that each byte placed in the buffer is removed from the buffer in the same order Firmware The software that controls and manages the host adapter It is firm as opposed to soft because it is designed into the host adapter and cannot be modified by the user GByte Gigabyte A measure of computer storage One GB yte equals approximately one billion bytes A byte is the amount of storage needed to hold one character
26. external connector for SCSI Channel A uses a 50 pin shielded cable with a high density external connector E xternal cable connectors are keyed and can only be plugged in one way Pin 1 orientation is automatic To connect external SCSI devices 1 Connect one end of the external cabletothe host adapter external connector as shown in Figure 2 9 Getting Started EXTERNAL SCSI CABLE EXTERNAL CONNECTOR Figure 2 9 Connecting External Cable to Host Adapter 2 Connect the other end of the external cable to either one of the SCSI connectors on the SCSI device as shown in Figure 2 10 EXTERNAL SCSI DEVICE EXTERNAL SCSI CABLE Figure 2 10 Connecting External Cable to SCSI Device 2 19 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 19 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 r 1 Eme nmm m mmm E m MR M RM EIE Rm RE m ja m m ete aaa 3 Toconnect subsequent external SCSI devices obtain addi tional external cables and chain each device to the previous device until all external SCSI devices have been connected as shown in Figure 2 11 Floppy Diskette Drives Floppy diskette drives connected to the floppy connector on the host adapter are not part of the SCSI bus floppy diskette drives are controlled by the 5 51 floppy diskette controller on the host adapter Connecting Floppy Diskette Drives AHA 2742 2742T Only
27. power off unplug your computer and remove the cover 2 Install the host adapter in an available EISA slot which supports bus master operations refer to the host system documentation for details 3 Forinternal SCSI devices connect one end of the 50 pin SCSI ribbon cabletothe internal connector on the host adapter connect the other end to the connector on the internal SCSI device Make sure to align Pin 1 of the cable with Pin 1 of the connectors on the host adapter and internal SCSI device 4 Toconnect a second internal SCSI device plug the middle con nector of the SCSI ribbon cabletothe connector on the second internal SCSI device Toconnect additional internal SCSI devices to a SCSI bus you will need to obtain a 50 pin SCSI ribbon cable with enough connectors to accommodate all of your internal SCSI devices 5 Forexternal SCSI devices connect one end of the 50 pin shielded cable to the external connector on the host adapter connect the other end to one of the SCSI connectors of the external SCSI device External cable connectors are keyed and can only be plugged in one way To connect subsequent external SCSI devices you will need to obtain additional shielded cables to chain the devices together 2 6 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 6 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Getting Started 6 If you are using the floppy c
28. the DOS 1024 cylinder limit and supports disk drives up to 8 Gigabytes GBytes in size Xi Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 xi Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual The Glossary has definitions of special terms used in this manual and in SCSI literature in general Thelnde helps you locate specific information quickly Conventions Xii Thefollowing typographic conventions are used throughout this User s Manual bold U sed for keystrokes press the E nter key and screen selec tion fields select Backup Device and Helvetica Used for operator entry that must be typed exactly as shown device c adaptec aspidos sys and for screen messages Enter Password Helvetica Italics U sed as a place holder for text you must determine and typein enter nn for number Also used for program and file names in body text the autoexec bat file Italics Used for emphasis is only supported and document reference refer to Chapter 2 Setting Up ALL CAPITALS Used for acronyms such as SCSI and CD ROM Hexadecimal Numbers Are followed by an h e g 330h Numbered Step Marker The gt symbol marks the first in a series of numbered steps End Mark The symbol marks the end of the text for each chapter Adaptec AHA 2740 Series User s Ma
29. the PC bus also called Micro Channel architecture Multi tasking Operation The execution of commands in such a way that more than one command is in progress at the same time Multi tasking allows a computer system to take advantage of overlapping activities by using resources that are temporarily not required for other opera tions More than one program or more than one portion of a program may be operating in parallel Multi threaded I O A method by which data is accessed simultaneously from multiple SCSI devices to increase a system s data transfer rate For exam ple if the system needs data from two disk devices it requests data from the first device which temporarily disconnects from the SCSI bus whileit is seeking the data During this delay the System requests data from the second device and while that device disconnects from the bus to seek the data the first device starts sending the requested data over the bus etc The AHA 2740 Series and all other Adaptec host adapters fully support multi threaded I O PC AT A family of small computers sold by IBM also called the Personal Computer AT family of computers The name is trademarked by IBM PIO See Programmed Input Output Glossary 9 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 9 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 a a Programmed I nput Output A method of data transfer in wh
30. the signals used on the SCSI bus interface Differential signals occupy two conductors with a positive and negative polarity component of the signal This minimizes the effed of common mode signal noise and allows the SCSI bus to operate reliably over greater distances at a higher speed Direct Memory Access A mechanism that allows hardware control of the transfer of streams of data to or from the main memory of a computing sys tem The mechanism may require setup by the host software After initialization it automatically sequences the required data transfer and provides the necessary address information Glossary 5 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 5 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 is m d l n il AHA 2740 Series User s Manual Disconnect Reconnect Disconned is the function that occurs when a target releases con trol of the SCSI bus allowing the bus to go to the Bus Free phase Reconned is the function that occurs when a target selects an initiator to continue an operation after a disconnect DMA See Dired Memory Access EEPROM E ledrically E rasable Programmable Read Only Memory An inte grated drcuit used to store the host adapter configuration The data stored in the EEPROM can be updated whileit is installed on the host adapter EISA Extended Industry Standard Architecture A kind of computer bus EISA an
31. will affect BIOS only e Support Removable Disks as Fixed Disk Boot Device Only Extended Translation for Drives gt 1 GByte Enabled SupportMorethantwodrives Disabled lt ESC gt Figure 3 12 BIOS Configuration Selection Support Removable Disks as Fixed Disk This option allows you to configure removable media drives sup ported by the BIOS The default setting is Boot Devi ce Only The following choices are available Boot Device Only Only the removable media drive designated as the boot device will betreated as a fixed disk All Devices All removable media drives supported by the BIOS will betreated as fixed disk drives Disabled No removable drives will be treated as fixed disks Software drivers are needed for drives not controlled by the BIOS Note Support for removable drives means only that the BIOS allows for use of a removable drive as if it were a fixed disk drive it does not mean that the disk media can be removed during operation 3 13 um See m as Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 13 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 r 1 aa m im im m i mi iu m m a uoo m m m A AHA 2740 Series User s Manual Extended Translation for Drives 1 GByte This option allows you to enable or disable extended translatio
32. 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual Adaptec EZ SCSI B 4 If you are running MS DOS or MS DOS with Windows Adaptec EZ SCSI I O Operating Environment Software makes dri ver installation easier than ever before Adaptec EZ SCSI isa menu dri ven software package that configures your operating environment automatically Adaptec EZ SCSI has a number of utility programs including afdisk and scsifmt which are used to format and partition SCSI disk devices Adaptec E Z SCSI also includes an ASPI device driver called aspicd that supports most models of CD ROM drives and the aspidisk device driver which supports up to 24 fixed disk devices Toinstall support for SCSI devices other than fixed disk devices and CD ROM drives check the hardware documentati on for those devices If the device requires ASPI support you first need torun Adaptec EZ SCSI toinstall an ASPI manager and then install any other software provided with the device If the device is designed to interface directly with the host adapter then no ASPI manager is required Refer to the Adaptec EZ SCSI User s Manual for instructions on installing and running Adaptec EZ SCSI O Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page B 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Optimizing Performance About This Appendix Read this appendix to find out e How to optimize your system s per
33. 4 fdisk command 235 vidrios a en s ena e P e a dafs D 4 E EISA DUS recita hex GUERRE VER RAE 1 3 ELSAconfigurationdiskete 2 7 3 4 EISA configuration utility 1 4 2 7 3 3 3 4 is 3 19 running in monochrome mode 4 4 EISA SIOL eink ii M Re amm 2 4 2 6 2 7 2 13 3 4 Enable disconnection 3 15 C 4 Error if device not found 3 18 Erro Message isc ya Wd yaa e eR Rad ada bi a x 3 18 E xtended translation 1 7 3 14 D 1 D 5 EZ SCSI See Adaptec EZ SCSI i Fdisk COMMAND die iw D 4 Features essi pA Ea e PIG Yt eee er ci Mans 1 4 AA twee erui EV RR Edu 1 7 3 7 Floppydiskdrive 2 15 2 20 A 8 niz acai ded a aa d eec e d a ec i d Seana t 1 7 2 7 2 8 controller ul xe pe X eed 1 4 1 7 2 7 disablingthedrive 1 8 2 20 Index 3 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 3 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual Harddiskdrive 3 9 D 1 D 5 1 GBytesupport 1 7 3 14 D 1 D 5 asbootdevice 1 7 4 4 diskformatutility 3 20 DOS disk capadtylimit
34. 510381 00 Rev C Page G 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 zs nis Glossary A Adaptec EZ SCSI A user friendly software program that automatically installs SCSI devices such as fixed disks and CD ROM drives on a PC Adaptec EZ SCSI copies the required software programs to the PC s fixed disk and edits the configuration files so the host adapter can access the devices Advanced SCSI Programming Interface SeeASPI AIC 7770 Adaptec s single chip El SA to F ast SCSI host adapter ASPI Advanced SCSI Programming nterface A standard SCSI soft ware interface that acts as a liaison between host adapters and SCSI device drivers ASPI enables host adapters and device driv ers toshare a single SCSI hardware interface ASPI Manager A software module that provides an interface between ASPI mod ules a host adapter board and the SCSI devices connected to the adapter A single ASPI manager can handle multiple I O requests from multiple ASPI modules ASPI managers are written for a spedfic operating system such as DOS OS 2 or UNIX and a spedfic family of host adapter boards Asynchronous Data Transfer A data transfer method that involves interlocking a signal tothe initiator and a signal tothe SCSI target in such a way that each step of the data transfer must occur before the next step can begin Asynchronous data transfer is usually slow The rate is not affected by external tim
35. 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 8 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 bie Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 9 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 L S Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 10 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Las Table of Contents Preface InsideThis Manual xi Conventions x cedet da e beer e eiii ren e xii Advisories sele B ep NI eee ia xiii H Introduction About This Chapter 1 1 a setae Shi ER ED RR EE 1 3 The AHA 2740 Series of Host Adapters 1 3 e N E wa nw Ce a Rr RE e mr eon ERE 1 4 Fast Data Transfer Rates 1 4 Maximum Off loading the Host CPU 1 4 Fully Disk Array Capable 1 5 Advanced Fast SCSI 2 Implementation 1 5 Multiple Device and Applications Support 1 5 Board Layout sensum La dte res anda a MANG kang maa 1 6 Default Settings 1 7 The On board Floppy Controller AHA 2742 2742T Only 1 8 Unpacking and Inspedion
36. AHA 2740 2742 Single Channel AHA 2740T 2742T TwinChannel EISA to Fast SCSI Host Adapters User s Manual Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 inim m mmm mm m mm mM m mM m m mM M mM m M M mM M M M M M M M M E M m a Adaptec Inc 691 South Milpitas Boulevard Milpitas CA 95035 Copyright 1993 Adaptec Inc All rights reserved Adaptec and the Adaptec logo are registered trademarksof Adaptec Inc Printed in Singapore SIOCKNO 510381 00 Rev C LL 9 93 Information subjectto change without notice Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 2742 Single Channel AHA 2740T 2742T TwinChannel EISA to Fast SCSI Host Adapters User s Manual Gladaptec AAAAAAAAAAAA Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 i Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Copyright Copyright 1993 Adaptec Inc All rights reserved No part of this publication may bereproduced stored in a retrieval system or transmitted in any form or by any means eledronic mechanical photocopying recording or otherwise without the prior written consent of Adaptec Inc 691 South Milpitas Blvd Mil
37. BIOS and Device Configuration 3 12 Exit the EISA Configuration Utility 3 19 Utilities edic kx REST Rev RE SERE KAG 3 19 Disk Format Utility 3 20 Host Adapter DiagnosticUtility 3 21 Troubleshooting About This Chapter 4 1 SCSI Troubleshooting Checklist 4 3 Problems and Solutions 4 4 Conflicts With Other Options 4 7 APPENDIC ES Specific ations About This Appendix A 1 Tedhnicalinformation A 3 ProdudSpecifications A 3 Extended I ndustry Standard Architecture Interface A 4 SCSI interface A 4 Electrical Interface A 4 Floppy Disk nterface A 8 Standard Electronic and Physical Interface A 8 COnned vicario va te neue eae EMME A 8 vi Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page O vi Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Table of Contents I O Operating Environment AboutThisAppendix B 1 HostAdapterSuppot B 3 DOSMindows B 3 Optimizing Performance AboutThisAppendix C
38. CSI connector must be an unshrouded 50 pin header compatible vvith unshielded Alternative 1 connector as specified in ANSI X3 131 1986 Table A 4 lists the pin assign ments for the internal connector gl lulu ala is 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 5 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual Table A 4 Internal Connector Pin Assignments Pin signal Name Ground p Gron Ja Term Povver F used a jm l wo w sa pe ho A 6 A Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 6 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Specifications Extemal SCSI Connector The external SCSI connector must be a shielded 50 pin high den sity Alternative 1 connector as spedfied in proposed ANSI standard X3T9 2 86 109 Revision 10h Section 4 Figure 5 Table A 5 lists the pin assignments for the external connector Table A 5 External Connector Pin Assignments Pin a6 Open HG UJ 7 10 11 12 14 15 16 17 18 19 20 21 22 23 24 25 A 7 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 7 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 r b mmm m mn mm m nm m n s m mm m nm m m nm
39. CSI software package for the DOS Windows environment Refer to Appendix B 1 O Operating E nvi ronment These utilities are also available from the Adaptec BBS Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 4 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Troubleshooting When tried to use the format verify utility on a disk device got an Unexpected SCSI Command Failure pop up box with a lot of error information What does this mean This probably means that the utility encountered a problem with the disk device or the media and therefore cannot run The following information appears in the pop up window e SCSI target ID of the device e SCSI CDB Sent e g 2F 00 00 00 00 00 00 08 00 00 e Host Adapter Status e g 11h Selection timeout e Target Status e g 00h Good status e Sense Key e g O6h Unit attention e Additional Sense Code e Additional Sense Code Qualifier You can probably determine from the Sense K ey informati on both the cause of the problem and its solution Here are some of the more common Sense K ey values and their meanings 02h Not ready The media is not ready to format Besurethat media is inserted in the drive and that the media is spun up 03h Medium error The disk media may be defective If it is a removable media drive try using a different media If itis a fixed disk drive the disk may be physically damaged
40. Channel A that can accommodate a SCSI bus with up to seven SCSI devices con neded The AHA 2740T 2742T uses Adaptec s TwinChannel architecture and has two channels SCSI Channel A and SCSI Channel B that can each accommodate a SCSI bus with up to Seven SCSI devices connected SCSI Channel A is comprised of both an internal and external connector while SCSI Channel B is comprised of only an internal 2 15 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page2 15 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual connector To connect SCSI devices to SCSI channel A you will need either an internal SCSI cable and or external SCSI cable To connect SCSI devices to SCSI Channel B you will need only an internal SCSI cable Connecting Internal SCSI Devices Theinternal connector for your host adapter uses a 50 pin SCSI ribbon cable with a 50 pin header internal connector When connecting the 50 pin internal SCSI ribbon cable to both the host adapter and tothe internal SCSI device s make surethat Pin lorientation is maintained throughout the bus Pin 1 of the SCSI cableis designated by a colored stripe on one edge of the ribbon cable Pin 1 of the host adapter or SCSI device connector is usually designated by a delta or arrow symbol A on the connector Note Refer to the manufacturer s instructions to install and mount internal SCSI devic
41. Configuration utility provided with your EISA system e Thehost adapter parameters that can be configured e Theoptions availableto configure the host adapter BIOS and the devices connected to the host adapter e Thetwoutilities availablein the EISA Configuration utility 3 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 El The EISA Configuration Utility All ELSA machines are shipped with a bootable EISA Configuration diskette that contains a software program generally known as the EISA Configuration utility This utility is used to automate the configuration of the motherboard and all option boards installed in your EISA system The EISA Configuration utility must be run every time an adapter card is physically added removed or moved The utility operates on the information provided by the cfg configuration files and ov overlay files that accompany the EISA system board and or adapter card Note Always refer to the documentation provided with your EISA system for instructions on adding and configuring adapter boards Depending on the EISA Configuration utility supplied with your system host adapter configuration will vary however
42. DOS but also indudes ASPI management softwareto provide Vir tual DMA Services VDS support and enhanced Windows support Thedrivers that areinstalled will give DOS users the best perfor mance possible under not onl y DOS but Windows O C 5 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page C 5 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page C 6 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 D Disk Drives Over 1 Gigabyte About This Appendix Read this appendix to find out An overview of extended translation and the DOS 1 GByte limit e Whentousethe extended translation feature e Questions and answers about extended translation D 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page D 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 m is m uif m m ciim icm im Rm m m m m m m m m min Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page D 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 etm D Extended Translation Using DOS 5 0 Adaptec host adapters have always supported the full range of disk drive sizes under all major operating systems As disk drives have recently grown beyond 1 GByte in format
43. I O Operating Environment AboutThisAppendix B 1 HostAdapterSuppot B 3 DOSMindows B 3 Optimizing Performance AboutThisAppendix C 1 PerformanceTips C 3 Enabling Synchronous Negotiation C 3 Disabling the Host Adapter BIOS C 3 E nabling SCSI Bus Parity C 4 Setting Enable Disconnection C 4 Send Start Unit Command C 4 DOS Windows Performance C 5 Disk Drives Over 1 Gigabyte AboutThisAppendix D 1 Extended Translation Using DOS 5 0 D 3 The DOS 1 Gigabyte Limit D 3 When to Use Extended Translation D 4 With DOS Version 5On y D 4 Drives VVith Mixed Partitions D 4 Using FISK oos a Gah Gov e s GE RA Pere e a a D 4 Questions and Answers About Extended Translation D 5 Glossary AboutThisGlossary Glossary 1 GIGSS APY ct uoa rem we ees doe be eta Glossary 3 Index had aida te tele am lde ndex 1 vii Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page O vii Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 viii AHA 2740 Series Us
44. Jm mid ii i ei m eo m m a Ti m m m m D Index JUMPERS a AA AA 1 4 floppyenable 1 4 1 7 PA a eek ahd eed eae eek Lp 1 4 1 7 1 8 LED Connector 2 eee 1 7 2 8 2 14 Low level format 3 20 4 4 Multiplehostadaptes 2 4 Operatingenvironment B 1 configuring automatically B 4 Optimizing performance C 1 C 5 Parameters er aa Cie aduersa DP e we 2 7 3 5 Panty orco dene gana mi cel Mason ete uei 1 7 3 10 C 4 Partition cion a ez D 4 Performance tips eee C 3 PhliaseEnglne zs cuoco vus aa ee AE SES EE Ae 1 3 Powerreguirements 2 0 0 1 1 1 A 3 RAM 00000 1 7 Removablediskdrive 1 7 3 13 3 17 4 6 See also Hard disk drive See also SCSI device Reset oi 0000000000 KAB es 1 7 Reedtatpower on ete 3 11 Ribbon Cabl8 iussa erer edet pecie ay ahah den 2 16 Index 5 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 5 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual SCSI DUS ruens peste Su oec a ooo HS celda 1 3 2 4 3 9 3 15 connecting deviceS 2 15 1103040000 2 5 Danley soy iis amal Sa
45. M iU CE Mug 3 3 parameters Hrs ouo vp a EU SEO Balans 2 7 3 5 SCSI deviee Xml cesse hie S ERU pe YiGG 3 14 Configurationchip 1 7 Connectors external 1 7 2 6 2 15 A 7 EE 0 de 1 7 2 7 2 8 A 8 Internal aora cere e eli lazm de bila deye HESS 1 7 2 6 2 15 A 5 LED aaa Dana AR 1 7 2 8 2 14 o e o o RE 2 8 SCSl channel A Metros rone e deen 1 7 2 8 SCSI channel B 1 7 2 8 AA 7 CER DE RE CUR 1 3 1 4 Customer support See Technical support Index 2 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 r jm m alee ae ee ae m m R eS eae m m mi a mim Um m m m m Index BELA PE 2 15 Data FIFO threshold 1 7 3 7 Dataitransfer 3 od sada aaa ix Baal 1 3 1 4 3 17 Default Settings 4 vue exime ir la geylani ka ne e 1 7 Device driver softvvare 3 17 Disconnect reconnect 3 15 C 4 Disk devi ce booting TOM oo Deor a b ob aed ak EYE ni 4 4 formatting sss Blk D Re Lk H Pale KE Xa B 4 removable s saa BV Ba uix pau Ua aki B 3 DOS duc ese eere Ge acts rece ee ire et iere Ve B 3 C 5 copy command i e sesobsepesee bererUssUe4u oyma ei 3
46. ON TERMINATION ENABLED Figure 2 4 External Devices Only 2 10 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 10 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 1 iii min nim jm im m mmm a ei m i m eee ea Getting Started Terminating the Host Adapter The factory installed bus terminators on the host adapter are enabled by default Host adapter termination should be disabled only if you attach SCSI devices to both internal and external con nectors since the host adapter would then bein the middle of the SCSI bus Enabling or disabling host adapter termination is software selectable only and is done through your computer s EISA Configuration utility To disable termination on the host adapter refer to Chapter 3 Configuring the Host Adapter for instructions Terminating Other SCSI Peripheral Devices Most SCSI devices use a jumper or a switch located close to their SCSI connector s On some SCSI devices you will have to physi cally remove resistor module s Refer tothe manufacturer s docu mentation for instructions on enabling or disabling SCSI bus termination on your SCSI peripheral device s Note Some drives allow for the option of supplying termination power to their resistor modules from the SCSI bus instead of from the drives power supply This option is acceptable since the AHA 2740 Series of host adapters always supplies termina tion po
47. The floppy connectoy on the AHA 2742 2742T uses a 34 pin are not using the floppy controller on the AHA 2742 2742T eto disable it by removing thejumper shunt on J umper J 4 Getting Started To connect floppy diskette drives 1 Connect one end of the 34 pin floppy ribbon cable to the floppy connector on the host adapter as shown in Figure 2 12 COLORED STRIPE FLOPPY RIBBON CABLE l PIN 1 FLOPPY CONNECTOR Figure 2 12 Connecting Floppy Cable to Host Adapter 2 21 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 21 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual 2 Connect the other end of the 34 pin floppy ribbon cable to the connector on the first floppy drive Drive A as shown in Figure 2 13 COLORED STRIPE FLOPPY DISKETTE DRIVE Figure 2 13 Connecting Floppy Cableto Floppy Drive 3 Toconnect a second floppy drive plug the middle connector of the floppy ribbon cable to the connector on the second floppy drive Drive B as shown in Figure 2 14 COLORED STRIPE TO HOST ADAPTER FLOPPY DISKETTE DRIVE TO 1ST FLOPPY DRIVE Figure 2 14 Connecting a Second Floppy Drive 2 22 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 22 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Getting Started Before Re booti
48. a high performance connection between the EISA Extended 1 ndustry Standard Architecture bus and the SCSI Small Computer System nterface bus The AHA 2740 Series is a bus master device that transfers data into host memory at burst rates of 33 MB ytes sec These transfers are generally 32 bits wide except when transferring data into 8 or 16 bit memory Bus mastering minimizes host CPU overhead sincethe AHA 2740 Series has an on board sequencer SCSI PhaseE ngi nerM that allows it to independently manage data transfer between SCSI devices and the computer system memory without requir ing the involvement of the CPU This is the highest performance type of data transfer availablefor the EISA bus in multi tasking operating systems 1 3 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 3 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 a dcn s m m m nim E TE SM OE Eg EE EE AHA 2740 Series User s Manual The AHA 2740 Series supports only single ended SCSI devices Most of the SCSI drives on the market today are of this type Like all EISA I O cards the AHA 2740 Series does not havejump ers to change various EISA configuration options These options are changed via the EISA Configuration utility provided with every EISA system however the 2742 2742 does have a single jumper J 4 that is used to enable or disable the on board floppy controller Fe
49. ajor components e Thedefault settings of the host adapter and how to disable or enable the on board floppy controller e How to get help from Adaptec Technical Support 1 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 a mie i m m nm d n s s min m me m mom EE Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 H Overview This user s manual provides information on how toinstall and configure the AHA 2740 and AH A 2742 single channel and the AHA 2740T and AHA 2742T TwinChannel EI SA to F ast SCSI host adapters in an EISA computer system The AHA 2740 and AHA 2742 support a single SCSI channel SCSI Channel A whilethe AHA 2740T and AHA 2742T sup port Adaptecs TwinChannel SCSI Channel A and SCSI Channel B architecture Procedures for all adapters are the same except when regarding the on board floppy controller on both the AH A 2742 and AHA 2742T In this manual the AHA 2740 and AHA 2742 are referred to jointly as the AHA 2740 2742 host adapter the AHA 2740T and AHA 2742T are referred to jointly as the AHA 2740T 2742T host adapter Cumulatively all four host adapters are referred to as the AHA 2740 Series The AHA 2740 Series of Host Adapters The AHA 2740 Series provides
50. ard in the EISA system e Connecting cables and devices Reassembling the system e Configuring the host adapter with the EISA Configuration utility described in Chapter 3 2 3 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 3 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual The Host Adapter and the SC SI Bus 2 4 TheAHA 2740 Series ads on your computer s behalf as the host to your suite of SCSI devices Each chain of SCSI peripheral devices and their host adapter work together and is referred to as a SCSI bus When connecting SCSI devices to the SCSI bus consider the following Each AHA 2740 2742 installed in your system can be used to form a SCSI bus consisting of up to seven internal and external SCSI devices on its single channel SCSI Channel A Each AHA 2740T 2742T installed in your system can be used toform two SCSI busses using its TwinChannel architecture SCSI Channel A and SCSI Channel B SCSI Channel A can control up to seven internal and external SCSI devices while SCSI Channel B can control up to seven internal SCSI devices only The number of host adapters installed in your system is limited only by the number of available EISA slots that support bus master functions As with any standard bus the wires in a SCSI cable resemble transmission lines which can generate undesir able effects such as signal
51. atures Fast Data Transfer Rates Up to 33 MBytes sec on EISA bus 2 0 MBytes sec asynchronous SCSI data rate 5 0 MBytes sec synchronous SCSI data rate 10 0 MBytes sec synchronous F ast SCSI data rate Maximum Off loading the Host C PU 1 4 On board sequencer SCSI PhaseE ngine automates all SCSI protocol Low SCSI processing overhead Bus master DMA implementation Task scheduling and message based communication Programmable interrupts 32 16 and 8 bit host bus data transfer Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Km mmi mim m mim mmi mm s m m lm n in Gi ny m m m m i i Introduction Fully Disk Array Capable Ableto boot from any drive on the SCSI bus Background processing permits smooth error recovery Extensive support from leading disk array vendors Advanced Fast SCSI 2 Implementation Concurrent support of Fast SCSI synchronous and asynchronous devi ces Concurrent support of both standard and Fast SCSI devices Scatter Gather operation Simultaneous Target nitiator Fully multitasking multithreading Uses the superior SCSI 2 Alternative 1 external connector and standard internal ribbon connector Tagged queui ng support Programmable active SCSI termination Multiple LUN support Parity handling in Data Message and Command phases Multiple Device and Applications Sup
52. ct Bus Release Time to configure the amount of time in BCLKS Bus Clocks the host adapter will continue to transfer data after being pre empted in bus master mode Figure 3 3 displays your choices T he default setting is 60 BCLKS Normally 60 BCLKS is optimum however if multiple bus master cards are installed in the system you may want to lower the value to free the EISA bus sooner 3 6 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 6 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 a an 616 19 an Configuring the Host Ada pter Host Adapter Interface Definitions Bus Release Time 12 BCLKS Done F10 Edit Resources F6 gt lt Cancel ESC gt Figure 3 3 Selecting Bus Release Time Data HFO Threshold Select Data FIFO Threshold to configure the percentage used by the host adapter Figure 3 4 displays your choices The default setting is 10096 Normally a Data FIFO Threshold of 100 is optimum Host Adapter Interface Definitions Data FIFO Threshold 10076 7596 50 0 Done F10 Edit Resources F6 gt lt Cancel ESC gt Figure3 4 Selecting Data FIFO Threshold 3 7 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 7 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 r 1 AA AA a a
53. d or enabled All other SCSI devices installed between the ends of the SCSI bus must have their terminators either removed or disabled Enabling or disabling host adapter termination is software selectable onl y The factory installed bus terminators on the AHA 2740 Series are enabled by default Todisabletermination on the host adapter refer to Chapter 3 Configuring the Host Adapter for instructions Refer tothe SCSI device documentation for information on enabling or disabling SCSI termination on other SCSI devices 2 Verify that each SCSI device located on the SCSI bus is set to a unique SCSI ID 0 7 The default value for your host adapter is SCSI ID 7 Refer to Chapter 3 Configuring the Host Adapter for instructions on changing the SCSI ID for the host adapter Refer tothe SCSI device documentation for information on changing the SCSI D on other SCSI devices 2 5 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 5 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual Install Your Host Adapter and Peripherals Once the SCSI bus is properly terminated and each SCSI device is set to a unique SCSI ID you can physically install your host adapter and SCSI devices WARNING Turn OFF and disconnect power to the system and external equipment before removing the chassis cover or attempting any motherboard modifi cations 1 Turn
54. d set this option to yes however if you have more devices on the SCSI bus See ConfiguretheBlOS and SCSI Devicein Chapter 3 Send Start Unit Command This option which is supported by some SCSI devices reduces the load on your computer s power supply by allowing the host adapter to power up disk devices and other peripherals one at a time when you boot your system Otherwise the peripherals will all power up at the same ti me Send Start Unit Command is disabled set to no by default Check your hardware documentation before you enable set to yes this option to make sure your devices support it Then change the switch or jumper settings on the device to enable the options Toenable disable Send Start Unit Command See Configurethe BIOS and SCSI Devicein Chapter 3 C 4 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page C 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Optimizing Performance Try enabling Send Start Unit Command for one peripheral at a time rebooting each time to make sure each SCSI device works properly Some older disk devices do not support this option and may malfunction if they receive the command Note TheSend Start Unit Command has no effect if the host adapter BIOS is disabled DOS Windows Performance Adaptecs EZ SCSI 1 0 Operating Environment Software is designed not only to simplify installation of devi ce dri vers under
55. e Inside This Manual This manual provides complete instructions on how to install and use the Adaptec AHA 2740 Series of EISA to F ast SCSI Host Adapters Chapter 1 ntroduction provides general information about the Adaptec AHA 2740 Series of host adapters The features board layout and default settings areinduded It alsotells you how to contact Adaptec Technical Support Chapter 2 Getting Started has the information needed to install the host adapter and SCSI devices Chapter 3 Configuring the Host Adapter describes the EISA Configuration utility and how it is used to configure your host adapter The chapter also describes the utilities available through the EISA Configuration utility Chapter 4 T roubl eshooti ng has information to assist you in troubleshooting problems that may occur during installation and configuration Appendix A Specifications lists technical spedfications of the host adapter and its connectors which may be of useto the advanced user or technidan Appendix B O Operating Environment provides information on using your host adapter with various operating systems such as DOS Windows A brief discussion on Adaptec s EZ SCSI 1 O Operating Environment Software is also induded Appendix C Optimizing Performance has various tips on maximizing the performance of your host adapter Appendix D Disk Drives Ove 1 Gigabyte describes Adaptec s extended translation feature which allows you to bypass
56. e Older SCSI 1 devices may not accept the F ast AHA 2740 Series User s Manual Error if Device Not Found This option determines whether or not the host adapter BIOS generates an error message when the BIOS is unable to find the device during boot up When set to yes the BIOS checks the SCSI ID for a SCSI device if noneis found an error message is displayed during boot up sim ilar tothe following Channel A Target 1 Device Not Found When set to no the BIOS does not attempt to display en error message if the SCSI deviceis not found The default setting is no Send Start Unit Command This option which is supported by some SCSI devices deter mines whether or not the SCSI Start Unit Command SCSI com mand 1B is sent to the SCSI device most devices do not require this The Start Unit Command reduces the load on your comput er s power supply by allowing the host adapter to power up SCSI devices one at a time when you boot your system Otherwise the devices will all power up at the same ti me When set to yes the SCSI Start Unit Command is sent tothe SCSI device during boot up When set to no the SCSI device will power up in its normal fashion The default setting is no If this option is selected for more than one SCSI device the SCSI device with the lowest SCSI ID will besent the SCSI Start Unit Command first When the first device is ready and responds to the host adapter the next highest SCSI ID with a setting o
57. e smallest address able unit of memory and the smallest unit of transfer on the SCSI bus CCB See Command Control Block CCS See Common Command Set Glossary 4 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 iS Glossary CDB See Command Descriptor Block Command Control Block A software object prepared by the host microcomputer software for the host adapter to provide it all the control information it needs to execute a SCSI command Abbreviated CCB Command Descriptor Block A block of information passed across the SCSI bus to provide the command parameter and address information necessary for the target to execute the desi red functions Prepared by the host soft ware and placed in the CCB to be passed to the target by the host adapter Abbreviated CDB Common Command Set A de facto standard SCSI command set for communication with fixed disk drives The Common Command Set CCS is the basis for the SCSI 2 command set for all types of peripheral devices Device Driver A software program that enables a PC to communicate with peripheral devices such as fixed disk drives and CD ROM drives Each kind of device requires a different driver Device driver pro grams are stored on a PC s fixed disk and are loaded into memory at boot time Differential A term referringtothe electrical characteristics of
58. er device such as a mouse may be using IRQ12 Changethe adapter board s IRQ to the default value 11 or to some other value See Confi gure the Host Adapter Paramders in Chapter 3 When install my host adapter it either does not get automatically added by my EISA Configuration utility or an error is reported by the motherboard as not being a valid board even after running the EISA Configuration utility Verify that you are using the correct cfg file and ov file for the host adapter Also other EISA boards and their position on the bus could be causing the board to be mis identified Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 4 6 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Troubleshooting Conflicts With Other Options You will encounter problems if your host adapter and peripheral devices use overlapping extended BIOS and I O addresses To correct this probl em 1 ChangethelRQ settings with the EISA Configuration utility 2 UsetheEISA Configuration utility to view BIOS addresses for the host adapter and if necessary changethem O 4 7 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 4 7 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 4 8 Print Spec Number 491709 00 Rev C Current Date 9
59. er s Manual List of Figures Figure 1 1 Host Adapter Board Layout 1 6 Figure 2 1 Connectors on the Host Adapter 2 8 Figure 2 2 Internal and External Devices 2 9 Figure 2 3 Internal Devices Only 2 10 Figure 2 4 External Devices Only 2 10 Figure2 5 SCSILEDConnedor 2 14 Figure 2 6 Connecting Cabletolnternal Connedor 2 17 Figure 2 7 Connecting Cable to SCSI Device 2 17 Figure 2 8 Connecting a Second Internal SCSI Device 2 18 Figure 2 9 Connecting External Cable to Host Adapter 2 19 Figure 2 10 Connecting External Cable to SCSI Device 2 19 Figure 2 11 Connecting Multiple External SCSI Devices 2 20 Figure 2 12 Connecting Floppy Cable to Host Adapter 2 21 Figure 2 13 Connecting Floppy Cableto Floppy Drive 2 22 Figure 2 14 Connecting a Second Floppy Drive 2 22 Figure 3 1 Host Adapter Parameters 3 5 Figure 3 2 Selecting nterrupt Level 3 6 Figure 3 3 Selecting Bus ReleaseTime 3 7 Figure 3 4 Selecting Data FIFO Threshold 3 7 Figure 3 5 Selecting Host Adapter BIOS Base Address 3 8 Figure 3 6 Selecting Host Adapter SCSI ID 3 9 Figure 3 7 Selecting SCSI Bus Parity 3 10 Figure 3 8 Selecting SCSI Selection Timeout 3 11 Figure 3 9 Selecting SCSI Bus Reset at Power on 3 11
60. es inside your computer chassis Toconnect internal SCSI devices 1 Conneconeend ofthe 50 pin SCSI ribbon cabletothe internal connector on the host adapter as shown in Figure 2 6 2 16 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 16 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 ii min nimm a m m d em mi Ei m im im ia ei m ii ee 15 T Getting Started COLORED STRIPE PIN 1 INTERNAL SCSI CONNECTOR Figure 2 6 Connecting Cable to Internal Connector N Connect the other end of the 50 pin SCSI ribbon cable to the connector on the internal SCSI device as shown in Figure 2 7 PIN 1 COLORED STRIPE INTERNAL SCSI DEVICE Figure 2 7 Connecting Cable to SCSI Device 2 17 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 17 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 1 Eme nmm m Mmmm E m MR M RE EIE E m m m ja m AA E 3 Toconnect a second internal SCSI device plug the middle connector of the SCSI ribbon cabletothe connector on the second internal SCSI device as shown in Figure 2 8 PIN 1 COLORED STRIPE INTERNAL SCSI DEVICE 4 Toconnectthreeor more internal SCSI devices to a SCSI bus obtain a 50 pin SCSI ribbon cable with enough connectors to accommodate all of your internal SCSI devices Connecting External SCSI Devices The
61. f yes is sent the SCSI Start Unit Command This process continues until all supported devices respond to the host adapter Note If many drives are set to yes for the SCSI Start Unit Command system boot time will vary depending on how long each drive takes to spin up 3 18 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 18 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Configuring the Host Ada pter Exit SC SI Device Configuration When configuration of SCSI devices is complete press Esc to exit SCSI device configuration you will be prompted to either save or abandon device configurations as shown in Figure 3 14 Save Abandon device configuration e Save device configurations Abandon device configurations lt ESC gt Figure 3 14 Exiting SCSI Device Configuration Exit the ESA Configuration Utility Oncethe host adapter and SCSI devices are properly configured save and exit the EI SA Configuration utility as instructed on the screen s menu The following section Utilities describes the two utilities availablein the EISA Configuration utility Utilities Select Utilities from the EI SA Configuration utility to access the two SCSI utilities that are available with your host adapter as shown in Figure 3 15 3 19 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Pa
62. formance after installing the host adapter C 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page C 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page C 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Performance Tips Ther AHA 2740 Series is designed to maxi mize the performance of your SCSI devices and computer The following tips will help you take full advantage of the host adapter s advanced design features Enabling Synchronous Negotiation Synchronous negotiation is enabled set to yes by default on the AHA 2740 Series Y ou should normally enablethis option on the host adapter because most SCSI devices support it and becauseit allows data to be transferred faster on the bus however because a few SCSI devices e g certain CD ROM drives do not support synchronous negotiation and may malfunction if they receive a request for it you may want to disable synchronous negotiation See ConfigureBIOS and SCSI Devicein Chapter 3 Note Even when synchronous negotiation is disabled on the host adapter the host adapter will still switch to synchronous mode if it receives a request from the SCSI device Disabling the Host Adapter BIOS Disabling the host adapter BIOS saves you 16 KBytes of memory address space and can also shorten boot up time by as
63. ge 3 19 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual AIC 7770 Utility Selection Options e Disk Format Utility Host Adapter Diagnostic Utility lt ESC gt Figure 3 15 Utility Selection Disk Format Ulility This utility allows you to low level format your SCSI disk and or verify disk media for defects Note When migrating hard disk drives and or removable media drives from other manufacturers host adapters the disk format utility should be run to low level format your drive Disk Format Your fixed disk media must be low level formatted before you can use your operating system s partitioning and file perparation commands such as MS DOS fdisk and format Most SCSI disk devices are pre formatted and do not need re formatting The Adaptec low level formatting utility is compatible with the vast majority of today s SCSI disk drives Caution All data on the drive will be lost when performing a low level for mat Be sure to back up your data before performing this operation 3 20 e UNI mE Mm mimm s m in mmm m UR Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 20 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Configuring the Host Ada pter Disk Verify Once your SCSI disk is low level formatted disk verify scans the
64. he host adapter The SCSI ID on most SCSI devices is typically set with jumpers or with switches on the SCSI device Refer to the SCSI device doc umentation for information on changing the SCSI ID on other SCSI devices 2 12 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page2 12 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Getting Started Board Installation Toinstall the host adapter in your El SA system the chassis cover must be removed and the motherboard exposed Always refer to your El SA system documentation for instructions on removing the chassis cover and adding option boards such as the AHA 2740 Series of host adapters WARNING Turn OFF and disconnect power to the system and external equipment before removing the chassis cover or attempting any motherboard modifi cations Toinstall the AHA 2740 Series of host adapters in your EISA computer system 1 Removethe cover of your EISA computer system to expose the EISA bus slots on the motherboard 2 Locatean unused EISA slot in your system which supports bus master operations refer to the host computer system doc umentation for details and remove the corresponding slot cover 3 Carefully removethe host adapter from the antistatic bag Place the host adapter on top of the bag if you need to set it down 4 Align and insert the host adapter in the EISA slot Securethe host adapter in yo
65. ich the host microprocessor trans fers data to and from memory via the computer s I O ports PIO enables very fast data transfer rates espedally in single tasking operating systems like DOS RAM Random Access M emory M emory of which any byte can be accessed directly in a single memory cyde Information can be read from and written to the memory ROM Read Only Memory Memory in which any byte can be read but not written Scatter Gather A device driver feature that allows the host adapter to modify the transfer data pointer so that a single host adapter transfer can transfer to many segments of memory in a singletransfer minimizing interrupts and overhead SCB SCSI Control Block The mechanism used in emulation mode to transfer control information to and from the board SCSI Small Computer Systems Interface A bus interface standard that defines physical and electrical characteristics for hardware Glossary SCSI Device A device such as a host adapter board fixed disk drive or CD ROM drive that conforms to the SCSI interface standard and is attached to a SCSI bus cable The device may bean initiator a target or capable of both types of operation SCSI ID An identifier assigned to SCSI devices that enables them to com municate with a computer when they are attached to a host adapter via the SCSI bus Ead SCSI host adapter board has eight available SCSI I Ds with the numbers 0 through 7 Usually the host adapter itself
66. in Board Service BBS 1 9 Burstrates A A ot ieee ee p IN p Ve ape 1 3 Bus See SCSI bus Index 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 A ms mn s m m in OO d AHA 2740 Series User s Manual BUS DOK iio a ede ns ED eR STA E 3 6 Bus Mastar at a odia ee BER Re 1 3 1 4 2 6 Busreleasetime 1 7 3 6 Cables external 2 oc Sena 3000000000 2 6 2 18 floppy EY a 2 20 floppy Gable 21 eia reta terme om th ORS dunes ined 2 7 internal izle xr xe LEY pu 2 6 2 10 2 16 LED val ce eec gul bin yun Gad eee eee 2 14 pinlorientation 2 6 2 16 POWER x A IO A ee eis doute p dede d 2 7 SVSUOITL rer ion Deane esce natur ee a un acere Lic E VLA ce 2 7 CDROM or caida m YANA Ehe daa Kila WG B 3 B 4 CMOS ie e yala TAS UR Eee 7 4 4 Components eco ci KR NE N k l 1 6 Configuration configurationfile 2 7 3 3 3 4 conflicts with other options 4 7 EISA configuration diskette 2 7 3 4 See also EISA configuration utility hostadapter 2 7 3 1 3 19 3 21 overlayfile 2 7 3 3 3 4 OVer VIOW E Bie i hm cos trea ce du Gaal m
67. in the DOS Windows environment ISA Industry Standard Architecture expansion bus A type of computer bus used in most PCs ISA enables expansion devices like network cards video adapters and modems to send data to and recei ve data from the PC s CPU and memory 16 bits at a time Expansion devices are plugged into sockets in the PC s motherboard ISA is sometimes called the AT bus because it was originally introduced with thelBM PC AT in 1983 KByte Kilobyte A measure of computer storage One KByte eguals 1024 bytes A byteistheamount of storage needed to hold one character Logical Unit A physical or virtual device addressed through a target Each target can have up to eight Logical Units Logical Unit Number An encoded three bit identifier for a logical unit LU See Logical Unit LUN See Logical U nit Number Manager See ASPI Manager Glossary 8 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 8 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 hz mmn m mm m mm mim m a mn m mmm ee Glossary MByte Megabyte A measure of computer storage One MByte equals 1 048 576 bytes A byteis the amount of storage needed to hold one character Micro Channel A 32 bit computer bus standard introduced by IBM with the PS 2 series of PCs Micro Channel is an extension of the 16 bit ISA standard allowing expansion devices to move data 32 bits at a time on
68. ination on the SC SI Bus To reduce signal reflections on the SCSI bus thefirst and last physi cal SCSI devices on the ends of the SCSI bus must have a set of resistors called terminators either installed or enabled All other SCSI devices installed between the ends of the SCSI bus must have their terminators either removed or disabled Improper termination of the SCSI bus results in erratic device operation or general bus fail ure Table 2 1 describes the three possible SCSI device and Adaptec Host Adapter AHA configurations Table 2 1 SCSI Device and AHA Configuration Devices Connected To Host Adapt16 3 2tATpsw AHA 2740 Series User s Manual Intemal Devices Only When only internal devices are connected to the host adapter the last device connected to the SCSI ribbon cable and the host adapter itself should be terminated as shown in Figure 2 3 INTERNAL DEVICE INTERNAL DEVICE NO TERMINATION TERMINATION ENABLED C1 eS a HOST ADAPTER TERMINATION ENABLED Figure 2 3 Internal Devices Only Extemal Devices Only When only external devi ces are connected to the host adapter both the last device on the external chain of devices and the host adapter itself should beterminated as shown in Figure 2 4 HOST ADAPTER TERMINATION EXTERNAL DEVICE EXTERNAL DEVICE EXTERNAL DEVICE NO TERMINATION NO TERMINATI
69. ing constraints such as cable length and circuit response time AT Bus SeelSA G lossary 3 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 3 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 a AHA 2740 Series User s Manual BIOS Basic Input Output System Software coded into computer chips for various purposes The BI OS on the motherboard of a PC is the spedal program used to boot and control the computer There are other kinds of BIOS such as Host Adapter BIOS Bus A pathway for data in a computer system All PCs have an expan sion bus which is designed to host add on expansion devices such as modems adapter boards and video adapters E xpansion devices usethe bus to send data to and receive data from the PC s CPU or memory ISA EISA and Micro Channel are the major bus standards used in PCs Bus DeviceReset A SCSI message that clears all pending activity in the SCSI peripheral device target to which it is addressed Bus Mastering A high performance method of data transfer in which the host adapter s on board processor handles the transfer of data directly to and from a computer s memory without intervention from the computer s microprocessor This is the fastest method of data transfer available for multi tasking operating systems Adaptec s AHA 2740 Series of host adapters use bus mastering Byte An eight bit unit of data A byteis normally th
70. is assigned SCSI ID 7 and fixed disk devices are assigned to SCSI Ds O and 1 Single Ended A termreferringtothe electrical characteristics of the signals used on the SCSI bus interface Single ended signals occupy a sin gl e conductor and are references to a common ground carried on the cable between the SCSI components attached Most SCSI devices use singl eended groundi ng Some SCSI devices use a differential grounding scheme These devices are not supported by the AHA 2740 Series Differential devices may be damaged if you connect them and the AHA 2740 Series to the same SCSI bus Single Threaded Operation Operation of the computer system such that only one program can be operating or active at a time The system must wait until all resources are available before starting an operation and it can not start another operation until the first one is completed Small Computer Systems I nterface See SCSI Synchronous Data Transfer A method of data transfer in which data on the SCSI bus is clocked with fixed length fixed frequency strobe pulses The ac knowledgments may be delayed several clock periods from the data requests Synchronous data transfer can be used only for data transmission on the SCSI bus It cannot be used for com mand message and status transmission Glossary 11 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page G 11 Print Spec Number 491709 00 Rev C Current Date
71. is new to SCSI or has lim ited experience can use to install the host adapter and SCSI devices 2 1 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 1 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 2 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 L Installation Overview This chapter provides instructions that guide you through preparing SCSI devices for installation on the SCSI bus install ing the host adapter in the EISA system connecting the devi ces tothe SCSI bus cabling and re assembling the system For experienced users who are already familiar with SCSI and SCSI installation refer to the Quick Installation section in this chapter for instructions that allow you to get your host adapter up and running quickly If you are new to SCSI peripherals or if you have limited experi ence installing option boards in your computer refer to the more comprehensive instructions and illustrations found in the Installation section of this chapter For a brief discussion on how your host adapter works with other SCSI devices on the SCSI bus refer tothe following section The Host Adapter and theSCSI Bus Installing your host adapter involves the following e Terminatingthe SCSI bus e Settingthe SCSI ID e Installing the host adapter bo
72. l beset to SCSI ID 7 Refer to Chapter 2 Getting Started for additional information on SCSI ID SCSI Channel A Configuration Host Adapter SCSI ID O N0 4200J Done F10 Edit Resources F6 gt lt Cancel ESC gt Figure 3 6 Selecting Host Adapter SCSI ID 3 9 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 9 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual SCSI Bus Parity Check Select SCSI Bus Parity Check to enable or disable SCSI bus parity checking on the host adapter Figure 3 7 displays your choices The default setting is enabled The host adapter always generates parity when writing to the SCSI bus If any attached SCSI devices do not support SCSI parity checking then SCSI Bus Parity Check should be disabled Most devices today however do support SCSI parity checking SCSI Channel A Configuration SCSI Bus Parity Check Enabled Disabled Done F10 Edit Resources F6 lt Cancel ESC gt Figure 3 7 Selecting SCSI Bus Parity SCSI Selection Timeout Select SCSI Selection Timeout to configure thetime in millisec onds used by the host adapter during the SCSI selection phase Fig ure 3 8 displays your choices The default setting is 256 milliseconds Lowering the SCSI Selection Timeout will speed up SCSI bus sca
73. lah m d mete ad ntn tide 1 7 3 10 C 4 reset at caca ees Pe RU ce R E 1 7 3 11 SES Dy NN GE TERRAE ERA 2 12 termination 1 7 2 5 2 9 3 12 scsldhmanndA 1 7 2 4 2 8 2 15 SsCSIdhanndB 1 7 2 4 2 8 2 15 3 5 SCSI dip ika erimi ei e Sa 1 7 ou nar ek Rei ruere reiner BR 3 17 B 3 booting from zucesiicepcecS8pepeserneperfestrege4 a 4 4 configuration 3 12 3 14 connedingdevics 2 6 2 15 2 18 external 2 4 2 6 2 9 2 10 2 15 2 18 internal 2 luem xx 2 4 2 6 2 9 2 10 2 15 preparation ssec epe ehe rp v tk 2 5 singe mndeddewvices 1 4 tape drives i sever derik SER Dor REIR IR 2 12 termination be e e PE aa RR n 2 10 3 12 SCSE ID c sea rei S 1 7 2 4 2 5 2 12 3 9 3 14 3 18 4 3 conflicts lllo lE HERR EGER blm me 2 12 for boot drive IR IE fate Reto peur ahead 4 4 SCSI termination 1 7 2 4 2 5 2 9 2 11 3 12 4 3 4 4 4 6 disabling on the host adapter 2 11 reistormodule 2 11 teminat S a tanta ek e tes Se iaa Laan ana 2 5 Sededionphase ees 3 10 Selediontimeout es 1 7 3 10 Send Start Unit command
74. ling synchro nous negotiation which may result in erratic behavior or a hang condition For these devices set I nitiate Sync N egotiation tono Maximum Synch Xfer Rate This option determi nes the maximum synchronous transfer rate M Bytes sec that the host adapter will support The host adapter supports rates up tothe Fast SCSI maximum of 10 MBytes second The default value is 10 0 MBytes sec Valid values are e 10 0 MBytes sec e 8 0MBytes sec e 6 67 MBytes sec e 5 7 MBytes sec 5 0 MBytes sec 4 4 MBytes sec 4 0MBytes sec e 3 6 MBytes sec 3 16 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 16 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 TheFast SCSI synchronous data transfer rates are 10 0 8 0 6 67 and 5 7 MBytes sec If the host adapter is set not to negatiate for synchronous data transfer i e Initiate Sync N egotiation is set to no then the value selected here will be the maxi mum rate that the host adapter will accept n most cases the maximum value of 10 0 M B ytes sec can be used If the drive is not a Fast SCSI drive and cannot support the fast data transfer rates it can negotiate for a slower rate this is standard SCSI protocol However if a drive cannot accept values greater than 5 0 MB ytes sec the highest standard synchronous transfer rate then the Fast data transfer rates should not be used for the devic
75. lity 3 3 Run the EISA Configuration Utility 3 4 Copy Configuration and Overlay Files 3 4 Select the Host Adapter 3 4 Configure the Host Adapter Parameters 3 5 BIOS and Device Configuration 3 12 Exit the EISA Configuration Utility 3 19 Utilities edic kx REST Rev RE SERE KAG 3 19 Disk Format Utility 3 20 Host Adapter DiagnosticUtility 3 21 Troubleshooting About This Chapter 4 1 SCSI Troubleshooting Checklist 4 3 Problems and Solutions 4 4 Conflicts With Other Options 4 7 APPENDIC ES Specific ations About This Appendix A 1 Tedhnicalinformation A 3 ProdudSpecifications A 3 Extended I ndustry Standard Architecture Interface A 4 SCSI interface A 4 Electrical Interface A 4 Floppy Disk nterface A 8 Standard Electronic and Physical Interface A 8 COnned vicario va te neue eae EMME A 8 vi Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page O vi Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Table of Contents
76. m cs m m m m ll E AHA 2740 Series User s Manual Extended Industry Standard Architecture Interface Table A 1 Standard EISA Bus Electronic and Physical Interface Driver Output Signals oL 0 volts minimum 0 4 valts maximum OH 2 4 volts minimum 5 25 volts maximum SCSI Interface Electrical Interface Thesearethe specifications listed in ANSI X3 131 1986 for single ended operation Output Signals All signals use open collector or three state drivers Each signal driven by a SCSI device has the following output characteristics when measured at the SCSI device s connector Table A 2 Output Signals Characteristics VoL Low level output voltage 0 0 to 0 5 volts DC at 48 mA sinking signal assertion VoH High level output voltage 2 5 to 5 25 volts DC signal negation EA AAA A Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page A 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Specifications Input Signals SCSI inputs meet the following electrical characteristics on each signal induding both receivers and passive drivers Table A 3 Input Signals Signal Definition Characteristics High level input current 10 0 to0 1 mA at V1 2 7 volts DC Minimum input hysteresis 0 2 volts DC Maximum input capacitance 25 pF measured at the device connector dosest tothe stub if any within the device Intemal SCA Connector The internal S
77. much as 60 seconds See Configure the Host Adapter Parameters in Chapter 3 You should disable the host adapter BIOS if the peripherals on the SCSI bus for example CD ROM drives are all controlled by device drivers and do not require BIOS control C 3 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page C 3 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual Enabling SCSI Bus Parity Parity checking is a procedure used by the host adapter to verify the accuracy of data transfer on the SCSI bus Data verification is a desirable option so SCSI bus parity checking is normally enabled by default To usethis option most effectively be sure that it is enabled on each SCSI device as well as on the host adapter To enable disable SCSI Bus Parity Check on the host adapter See Configurethe Host Adapter Parameters in Chapter 3 Consult your hardware documentation for instructions on enabling parity checking on peripherals Note The only time when you should disable parity checking on the host adapter is when your system indudes a SCSI device that does not support this option Again consult the hardware docu mentation for the device Setting Enable Disconnection In the DOS environment you can increase performance slightly if you set Enable Disconnection to no when there is only a host adapter and a single disk device on the SCSI bus You shoul
78. n for SCSI hard disks with a capadty greater than 1 GByte The default setting is enabled Appendix D Disk Drives Over 1 Gigabyte discusses the extended translation feature in detail If this option is enabled the following translation schemes are used e SCSI hard disks x 1 GByte use a translation scheme of 64 heads 32 sectors per track SCSI hard disks 1 GByte use a translation scheme of 255 heads 63 sectors per track Note Enabling this option for operating systems that do not need extended translation e g NetWare 386 and UNIX can cause drive failure and or data loss Support More than Two Drives This option allows you to enable or disable BI OS support for more than two SCSI hard disks supported by DOS 5 0 and above The default setting is disabled SCSI Device Configuration SCSI Device Configuration allows you to customize the confi gura tion of each SCSI device connected on the SCSI bus When this option is selected a screen similar to Figure 3 13 is displayed All SCSI IDs are displayed on the screen even if no SCSI device is attached however to configure a specific SCSI device you will need to know which SCSI ID corresponds to that SCSI device Use the cursor keys to move between options To toggle values for each option press the E nter key 3 14 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 14 Print Spec Number 491709 00 Rev C Current Date 9 1 93
79. ng Your System Before re booting your system and configuring your host adapter make sure you have completed the following 1 TheSCSI bus is properly terminated 2 Each SCSI device on the SCSI bus is set to a unique SCSI ID between 0 and 7 3 Thehost adapter is firmly seated in the host computer s EISA slot 4 Internal SCSI devices are connected to the host adapter with the 50 pin SCSI ribbon cable and that proper Pin 1 orientation is maintained 5 External SCSI devices are properly installed and cabled 6 If using the on board floppy controller on the AHA 2742 2742T the floppy diskette drive is connected to the host adapter with the 34 pin SCSI ribbon cable and that proper Pin 1 orientation is maintained 7 All system and power cables are properly connected Reassemble the System Refer to your system and SCSI device documentation to replace the system cover and conned all system and SCSI device power cables O 2 23 Adaptec 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 23 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 24 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 mn El Configuring the Host Adapter About This Chapter Read this chapter tofind out e Thestepsinvolvedin configuring your host adapter with the EISA
80. nly one SCSI deviceis using the SCSI bus A slight performance increase may be realized if disconnect is not allowed in this case due to the decreased SCSI overhead In multi device environ ments disconnect should normally be enabled to take advantage of the disconnect reconnect feature Ifa particular SCSI device does not support disconnect reconnect then Enable Disconnection should be disabled set to no If a particular SCSI device does support disconnect reconnect then Enable Disconnecti on should be enabled set to yes Most SCSI devices today do support disconnect reconnect 3 15 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 15 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual Initiate Sync Negotiation This option determines whether or not the host adapter will initiate synchronous negotiation with the SCSI device When set to yes the host adapter will initiate synchronous negoti ation with the SCSI device When set to no the host adapter will not initiate synchronous negotiation with the SCSI device The host adapter however will always respond to synchronous negoti ation initiated from the SCSI device The default setting is yes If neither the host adapter nor the SCSI peripheral negotiate for synchronous data transfers all data transfers will be asynchronous Note Some older SCSI 1 devices may havetrouble hand
81. not require extended transla tion to support large disk drives Drives With Mixed Partitions Donat use extended translation on drives formatted with two or more partitions for different operating systems Use standard trans lation The sum of the DOS partitions will be less than 1 GByte Partitions for UNIX and NetWare can belarger than 1 GByte when using standard translation Note UNIX is understood tobe AT amp T SJUSL all versions SCO v3 2 4 or later and ISC v3 0 or later Using Fdisk Toinstall a new disk or tore partition an existing disk usethe fdisk DOS utility as you normally would The cylinder sizeincreases to 8 M Bytes when you enable extended translation The size of the parti tion you request must therefore be a multiple of 8 MBytes If you request a partition sizethat is not a multiple of 8 MBytes fdisk will round up to the nearest whole multiple of 8 M Bytes D 4 Adaptec AHA 2740 Series User s Manual i Stock Number 510381 00 Rev C Page D 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Disk Drives Over 1 Gigabyte Questions and Answers About Extended Translation What happens if enable extended translation with SCSI drives that are less than 1 GByte in capacity Drives handled by the BIOS will use extended translation pro vided they are over 1 GByte in formatted capacity Drives with less than 1 GByte of formatted capacity will use standard transla
82. ns considerably however before lowering this value make sure that all the devices on the SCSI bus can respond to the shorter selection time 3 10 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 10 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Configuring the Host Ada pter SCSI Channel A Configuration SCSI Selection Timeout 256 milliseconds 128 milliseconds 64 milliseconds 32 milliseconds Done F10 Edit Resources F6 gt lt Cancel ESC gt Figure 3 8 Selecting SCSI Selection Timeout SCSI Bus Reset at Power on Select SCSI Bus Reset at Power on to enable or disable a SCSI bus reset generated by the host adapter during its power on initialization and after a hard reset Figure 3 9 displays your choices The default setti ng is enabled Normally SCSI Bus Reset at Power on should always be enabled SCSI Channel A Configuration SCSI Bus Reset at Power on Enabled Disabled Done F10 Edit Resources F6 gt lt Cancel ESC gt Figure 3 9 Selecting SCSI Bus Reset at Power on 3 11 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 11 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 r 1 ii a aa AHA 2740 Series User s Manual SCSI Bus Termination Select SCSI Bus
83. nual Stock Number 510381 00 Rev C Page 0 xii Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Preface Advisories Advisories are quick notes that stress an important point or warn of a potential hazard tothe system data and or the user This manual uses three types of advisories which are as follows Note Text set off in this way presents reminder tips or suggestions which may simplify the assembly and use of the host adapter Caution Failuretoobservethis type of advisory could result in damage to your system devices and or data WARNING This type of advisory is a visual alarm Failure to observe this type of advisory could result in injury to the user xiii Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page O xiii Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page O xiv Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 0 x Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 H Introduction About This Chapter Read this chapter tofind out e Anoverview of the AHA 2740 Series of EISA to F ast SCSI host adapters e Thefeatures of the AHA 2740 Series e Thelayout of the host adapter and all its m
84. onnecting Peripherals U p to seven SCSI devices can be connected to the internal and external connectors on the AHA 2740 2742 Up totwo floppy disk ette drives can be connected to the floppy connector on the AHA 2742 27421 Always refer to the manufacturer s documentation before connecting and installing your SCSI devices and or floppy diskette drive s Note Only SingleEnded SCSI devices are supported by the host adapter Differential SCSI devices may be damaged if con nected to the host adapter bus Most SCSI devices currently produced are Single Ended SCSI devices Consult your SCSI device user documentation to verify that your SCSI device is a Si ngle E nded SCSI device SCSI Devices SCSI devices are either internal SCSI devices or external SCSI devices Internal SCSI devices usually have only a single connec tor and can only be cabled tothe internal connector on the host adapter External SCSI devices usually have two connectors and can be cabled to either the external connector on the host adapter or tothe external connector of another external SCSI device SCSI devices are cabled together in a single continuous daisy chain of devices This chain may have no branches but must run from device to device in a continuous series If your host adapter ind udes both internal and external SCSI devices the host adapter will be at the junction between the internal and external devices The AHA 2740 2742 has a single channel SCSI
85. ontroller on the AHA 2742 2742T connect one end of the 34 pin floppy ribbon cable tothe floppy connector on the host adapter connect the other end tothe connector on the first floppy drive Drive A To connect a second floppy drive plug the middle connector of the floppy ribbon cable to the connector on the second floppy drive Drive B 7 Reinstall your cover and reconnect all system and peripheral power cables Configure the Host Adapter All ELSA computer systems are shipped with a software program generally known as the EISA Configuration utility Run the utility to configure your host adapter for operation in your EISA computer system Chapter 3 Configuring your Host Adapter provides a comprehensive description of how the utility works however the basic steps involved indudethe following 1 RuntheElSA Configuration utility as instructed by the EISA system vendor 2 Copy the adp7771 cfg configuration file and adp7770 ov1 over lay file needed to configure your host adapter with your EISA system from the diskette that came with your host adapter to either the bootable EISA Configuration diskette or tothe directory on your hard disk where the utility is located 3 Select the option in the utility that allows you configure the EISA slot in which the host adapter is installed 4 Configurethe host adapter parameters 2 7 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 7 Print Spec
86. pitas CA 95035 Trademarks All product names mentioned below and in this manual aretrademarks or registered trademarks of their respediveowners Adaptec and the Adaptec logo are registered trademarks and AHA TwinChannel and PhaseE ngineare trademarks of Adaptec Inc AT amp T isa registered trademark of American Telephone and Telegraph Company Bernoulli is a registered trademark of I omega Corporation IBM OSZ AT and Micro Channel are registered trademarks of International Busi ness Machines Corporation MS DOS is a registered trademark of Miarosoft Corporation NetVVare is a registered trademark of Novell Inc SCO is a registered trademark of the Santa Cruz Operation Inc UNIX isa registered trademark and USL is a trademark of Unix Systems Laboratories Changes The material in this manual is for information only and is subject to change without ndice While reasonable efforts have been made in the preparation of this manual to assure its accuracy Adaptec nc assumes no liability resulting fran errors ar omissions in this manual or from the use d the information contained herein Adaptec reserves the right to make changes in the product design without reservation and without notification toits users Adaptec AHA 2740 Series User s Manual i Stock Number 510381 00 Rev C Page 0 ii Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 FCC Compliance Statement NOTE This equipmen
87. port The AHA 2740 2742 can be used to install up to seven SCSI devices The AHA 2740T 2742T can be used to install up to 14 SCSI devi ces The AHA 2742 2742T can be used to install up totwo floppy diskette drives 1 5 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 5 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 M n m m mm mm m mim i n Qn ge ee m mim m n m m n n n si n m AHA 2740 Series User s Manual e TheAHA 2740 Series BIOS fully supports the extended parti tioning capabilities of DOS 3 3 for up to two drives and DOS 5 0 and above for up to seven drives per host adapter eight total e The AHA 2740 Series supports both fixed and removable media devices with capacities above 1 Gigabyte GB yte e Managers and device module software available for all major operating systems Board Layout Figure 1 1 shows the location of the major components on the host adapter Table 1 1 provides a description of each component J2 U2 J4 J3 U5 Figure 1 1 Host Adapter Board Layout 1 6 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 6 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Km memini mm mim m mim mmi mm m Ra lm AA AA Int
88. reflection and uneven loading of the line drivers To reduce these effects the SCSI bus must be properly terminated Termination on the SCSI bus is discussed in detail later in this chapter Toidentify each SCSI device s address and to determine its priority on the SCSI bus each SCSI device induding the host adapter located on the SCSI bus must be set to a unique SCSI ID 0 7 SCSI ID setting is discussed in detail later in this chapter Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Getting Started Quick Installation Thefollowing installation procedures are intended to help experi enced users quickly install the AHA 2740 Series of host adapters into an EISA computer system f you are new to computer peripheral installation or would like more information refer to the more comprehensive instructions and illustrations found in the nstallation section of this chapter Prepare Your SCSI Devices Before you physically install the host adapter and connect the SCSI devices you must prepare your SCSI devices for installa tion on the SCSI bus 1 Terminatethe endpoints of the SCSI bus Identify which two SCSI devices induding the host adapter will form the physical endpoints of your SCSI bus These devices at the ends of the SCSI bus must have a set of resis tors called terminators either installe
89. roduction Table 1 1 Host Adapter Components Location Description O J5 SCSI Channel B Internal Connector AHA 2740T 2742T only Default Settings Your host adapter is already configured for the majority of EISA dass computers Table 1 2 lists the default settings of your host adapter Refer to Chapter 3 Configuring the Host Adapter for information on changing any of the settings Table 1 2 Host Adapter Default Settings Default Setting Interrupt Level IRQ 11 Level Sensitive SCSI Bus Reset at Power on Enabled Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 7 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 1 1 ka m mier i m m a monim mun m m ln ss nda m n on AHA 2740 Series User s Manual The On board Hoppy Controller AHA 2742 2742TOnly The on board floppy controller on the AHA 2742 2742T is enabled by default and is controlled by J umper J 4 e If your floppy diskette drives are already running under another controller disable the on board floppy controller by removing the jumper shunt on J umper J 4 e Tousethe on board floppy controller leave the jumper shunt installed on J umper J 4 and then disable your existing floppy controller refer to your computer or floppy controller user documentati on Unpacking and Inspection 1 8 Your host adapter should be undamaged when you receive it The carrier or distributor where you p
90. st adapter Adaptec is working with major operating system suppliers to provide embedded support in their operating systems Please contact Adaptec or your operating system vendor for information on the current schedule for 1 O Operating E nvironment Software support Note Until embedded support is provided for your particular operat ing system host adapter drivers for the AHA 2740 Series may be available from Adaptec To order Adaptec software call the number for ordering Adaptec software listed in the Adaptec Technical Support section found in Chapter 1 Introducti on DOS Windows Under MS DOS 5 0 or higher up to seven SCSI hard disk drives per host adapter eight total can be connected without additional software older versions of DOS support up to two hard disk drives Additional softwareis required if you desire to do any of the following e Support morethan two fixed disk drives under versions of DOS prior toMS DOS 5 0 e Support morethan eight fixed disk drives seven per host adapter under MS DOS 5 0 or higher e Removeor switch removable media for example Bernoulli cartridges while your computer is running e Support CD ROM drives e Support devices other than CD ROM drives and disk drives for example SCSI tape drives scanners plotters or worm drives B 3 Adaptec 2740 Series User s Manual Stock Number 510381 00 Rev C Page B 3 Print Spec Number 491709 00 Rev C Current Date 9
91. t Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual Problems and Solutions 4 4 The screen is difficult to read when I run the EISA Configuration utility Try pressing F5 to toggle the display between color and mono chrome modes T his may enable you to read the screen more easily I installed the host adapter and my computer will not boot from the SCSI disk drive If both SCSI and non SCSI disk drives are installed then the non SCSI disk driveis always the boot device If your system has only SCSI disk drives 1 Make sure your computer system s CMOS setup is set to No Drives Installed as is required for SCSI host adapters Try setting the SCSI boot drive to SCSI ID O This is nor mally done by changing jumpers or switches on the drive On each SCSI bus SCSI devices must be set to a unique SCSI ID which range from to 7 See SCSI ID Seating in Chapter 2 Try enabling Include in BIOS Scan in the BIOS and SCSI Device Configuration option See ConfigureBIOS and SCSI Devicein Chapter 3 Makesurethe SCSI bus is properly terminated See Termination on the SCSI Busin Chapter 2 Y ou may need to low level format the SCSI hard drive If so first back up all data on the disk then run the format utility accessible through the EISA Configuration utility See Utilities in Chapter 3 Similar formatting utilities for removable media devices are included in the Adaptec EZ S
92. t has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC rules Theselimits are designed to provide reasonable protection against harmful interference in residential installations This equipment generates uses and can radiate radio frequency energy and if nat installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause interferenceto radio or television equi pment reception which can be determined by turning the equipment off and on the user is encour aged to try to correct the interference by one or more of the following measures e Reorient or relocate the receiving antenna e Movethe equipment away from the receiver Plug the equipment into an outlet on a circuit different from that to which the receiver is powered f necessary the user should consult the dealer or an experienced radio television technician for additional suggestions CAUTION Only equipment certified to comply with Class B computer input output devices terminals printers etc should be attached tothis equipment and must haveshielded interface cables Finally any change or modifications to the equipment by the user not expressly approved by the grantee or manufacturer could void the user s authority to operate such equipment
93. ted capacity they have run up against the DOS 1024 cylinder limit Tocontinue its support for all SCSI disk drive capadties under DOS Adaptec has introduced an extended translation scheme for the AHA 2740 Series of host adapters This new feature bypasses the DOS disk capacity limit and supports disk drives up to 8 GBytes in size under DOS providing room for years of disk drive evolution To enable this feature refer to Configure BIOS and SCSI Devicein Chapter 3 The DOS 1 Gigabyte Limit All versions of DOS are limited to 1024 cylinders per drive The standard translation scheme for SCSI host adapters using 64 heads and 32 sectors provides a maximum accessible capadty of 1 GByte Toeliminate the 1 GByte limit Adaptecs new extended transla tion feature uses 255 heads and 63 sectors extending the disk drive capacity limit under DOS to 8 GBytes Caution If you have already partitioned a large disk drive with one translation method conversion to another method will erase your data Be sure to backup your disk drive prior to any change in the translation method used D 3 Adaptec AHA 2740 Series User s Manual i Stock Number 510381 00 Rev C Page D 3 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual When to Use Extended Translation With DOS Version 5 Only NetWare 386 and the newer versions of UNIX do not sharethe 1024 cylinder limit of DOS and do
94. this option to copy the adp7771 cfg and the adp7770 ovi files from the host adapter diskette to either the bootable EISA configuration diskette or tothe directory on your hard disk where the EI SA Configuration utility is located If the Configuration utility does not provide such an option use the DOS Copy command to copy these files Selectthe Host Adapter Once the configuration and overlay files have been copied choose the option in the EISA Configuration utility that allows you to con figurethe EISA slot in which the host adapter is installed If neces sary scroll down the screen until you find a screen that lists the host adapter and its parameters and looks similar to Figure 3 1 3 4 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 3 4 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Configuring the Host Ada pter Slot 1 Adaptec AHA 2470 AHA 2740T SCSI Host Adapter Host Adapter Interface Definitions Interrupt Level Bus Release Time Data FIFO Threshold BIOS Definitions Host Adapter BIOS Base Address SCSI Channel A Configuration Host Adapter SCSI ID SCSI Bus Parity Check Enabled SCSI Selection Timeout 256 milliseconds SCSI Bus Reset at Power on SCSI Bus Termination BIOS and Device configuration Press Enter to configure Utilities Press Enter to access More PgUp PgDn Edit Enter Edit Resources F6 gt lt Advanced F7 gt lt Done F10 gt
95. ur system Note EISA boards require firmer seating than typical ISA expansion boards Make sure the host adapter is fully seated in its slot 2 13 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 13 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual SCSI Bus Activity LED Connector Most computer systems have a disk drive activity light usually an LED Light Emitting Diode on the front panel If you connect your system s LED cabletothe host adapter the LED will light toindicate data transfer on the SCSI bus Note If you connect your computer s LED to the host adapter the LED will no longer indicate non SCSI disk activity So you may not want to usethis feature if you arerunning non SCSI disk drives To connect the SCSI bus LED connector 1 Refer to your system s documentation to locate and unplug the LED cable from the connector on the system board 2 Connect the LED cable to the SCSI activity LE D connector J 1 on the host adapter as shown in Figure 2 5 Note On systems with a two position LED cable connect the LED cableto pins 1 and 2 of the LED connector LED CONNECTOR Figure 2 5 SCSI LED Connector 2 14 Adaptec 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 14 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Getting Started C
96. urchased the host adapter is responsible for any damage incurred during storage or shipment n case of damage return the host adapter to your distributor if the host adapter was delivered to you directly havethe carrier note the damage on both the delivery receipt and the freight bill then notify the freight company representative so that the necessary insurance claims can be initiated Caution The host adapter is extremely sensitive to static electricity even a mild shock can destroy a component on the board Keep the host adapter in its conducive wrapping until you are ready to install it in your system Before handling the host adapter always ground yourself by touching the system chassis of your computer Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 8 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 Km memini mm mim m mim mmi mm Ri m lm E Introduction Adaptec Technical Support The AHA 2740 Series has been specifically developed for easy installation and use We hope that our manuals and the on screen instructions and help available in both the host adapter Configuration Software and Adaptec O Operating Environment Software installation programs are complete and dear enough to meet your needs If you need further help please contact us e TheAdaptecElectronic Bulletin Board Service BBS pro
97. vides information on software upgrades new releases technical advice and other topics The BBS can be reached 24 hours a day at 408 945 7727 1200 2400 9600 baud 8 data bits 1 stop bit no parity e TheAdaptecTechnical Support Hot Line can be reached at 800 959 SCSI 7274 or 408 945 2550 M Th 6 00 a m to 5 00 p m F 6 00 a m to 3 00 p m PST e TheAdaptecTechnical Support FAX can bereached 24 hours a day at 408 945 6776 e Adaptec software can be ordered by calling 800 442 7274 M F 5 00 a m to 6 00 p m PST e Additional documentation for Adaptec products can be requested by calling 800 934 2766 M F 5 00 a m to 6 00 p m PST or you can write to Adaptec Inc Literature Department 691 South Milpitas Blvd Milpitas CA 95035 1 9 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 9 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 e id m e m nm E AA AA m mm E Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 1 10 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 2 Getting Started About This Chapter Read this chapter to find out e An overview of the steps involved in installing your host adapter e A brief discussion on your host adapter and the SCSI bus e Theinstructions an experienced user can useto quickly install the host adapter e Theinstructions a user who
98. wer on the SCSI bus 2 11 Adaptec AHA 2740 Series User s Manual Stock Number 510381 00 Rev C Page 2 11 Print Spec Number 491709 00 Rev C Current Date 9 1 93 ECN Date 9 14 93 AHA 2740 Series User s Manual SCSI ID Setting Each SCSI device located on the SCSI bus must be set to a unique SCSI ID 0 7 The SCSI ID serves two purposes it uniquely defines each SCSI device s address and it determines the device s priority on the bus during arbitration phase The arbi tration phase determines which device will own the bus when two or more devices simultaneously request to use it SCSI ID 7 has the highest priority and SCSI ID O has the lowest When select ing the SCSI ID consider the following e Thedefault valuefor your host adapter is SCSI ID 7 You only need to change a devices SCSI ID if it conflicts with the SCSI ID of another device or another host adapter assuming they are on the same SCSI bus fyouareinstalling more than one SCSI host adapter each host adapter may be set to the same SCSI ID assuming they are on separate SCSI busses e SCSI IDsOand 1 are best reserved for SCSI hard disk drives e SCSI ID Ois best reserved for the SCSI hard disk drive that will be used as you computer s boot device e SCSI ID is best reserved for a second hard disk drive e SCSI ID2is often used for tape devices Refer to Chapter 3 Configuring the Host Adapter for instructions on changing the SCSI ID for t

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