USER`S MANUAL - Docket Alarm
Contents
1. 9999999092090999990 99090920909909009020009090200 60900900009000000006000066 9 900994202099600000609020 9020002820000000090009090009 00000000090900000009909999 55995999955 eeeeeeeeo x 455 Dn Ji Ue Bet I uk B 11000000000 BANK C 0 0162 910272 DUE RO iios SE aur H lt 999990 elt Ty 1000000000 10000000000 sep rol J 0000000000 0000000000 4 989 150 7 18921 lt 4 UTU 0000000000 we cp E aI Q 0000000000 0000000000 ssssU sseeeesCeceses v d we 9 T 1 0000000000 0000000000 127 a 1 ES pU sb SOUL E TOT mE 28 E gt mindi 9 pomi 000000 MASS S m 000000 Um Gol os d am ons BS ant 29 9 ye nnnm Figure 1 System2. Res As BR 9 RUNNING THE WINBIOS 00 2000 10 Exiting the Setup Program eese eene nnne 11 Main Menu Setup Screen 12 Standard Setup eed ede te ete det 13 Hard Disk 15 Advanced Setup id eed a n edet 17 Chipset Setup iu adu EE UE ta ie S sassa 22 Peripheral Setup ipe ete ee 26 URHIYYWIRdoW esce ed uite tein eise 28 Security WING OW e Tere Sige 28 Boot Sector Virus nnne nnne 29 Formatting the Hard Disk Drive s 29 Password SuppoOtt uu eei tee t ise chiude us D ei e Lt eode ey 30 Default Windows eiie etae tee 31 FACTORY RECOMMENDED CMOS SETTINGS 32 TECHNICAL REFERENCE roses opo eoo etos sodos 35 586 SYSTEM BOARD JUMPER SETTINGS 35 CONNECTOR CABLE 36 Serial Cable er o e ane eie E 36 FIGURE 1 SYSTEM BOARD essen 4 FIGURE 2 EXIT SETUP MENU rone pernesan eie eneee poaa N aa enn 11 FIGURE 3 MAIN SETUP MENU nasisa S 12 FIGURE 4 STANDARD SETUP 13 FIGURE 5 ADVANCED SETUP MENU PAGE 1 OF 5 17 FIGURE6 ADVANCED SET
3. 112MB 10 820 3 65535 820 17 20MB 11 855 5 65535 855 17 35MB 12 855 7 65535 855 17 50MB 13 306 8 128 319 17 20MB 14 733 7 65535 739 17 43MB 16 612 4 0 663 17 20MB ya 977 5 300 977 jJ 41MB 18 7 65535 977 17 57MB 19 1024 D 512 1023 17 60MB 20 733 5 300 732 17 30MB 21 733 7 300 732 yia 43MB 22 733 5 300 733 17 30MB 23 306 4 0 336 We 10MB 24 925 3 0 925 17 54MB 25 925 9 65535 925 17 69MB 26 754 7 754 754 17 44MB 27 754 11 65535 754 Hn 69MB 28 699 T 256 699 17 41MB 29 823 10 65535 823 17 68MB 30 918 7 918 918 17 53MB 31 1024 65535 1024 17 94 32 1024 15 65535 1024 17 128 33 1024 5 1024 1024 fr 43MB 34 612 2 128 612 17 10 35 1024 9 65535 1024 177 77MB 36 1024 8 512 1024 17 68MB 37 615 8 128 615 41MB 38 987 3 987 987 17 25MB 39 987 7 987 987 17 57MB 40 820 6 820 820 17 41MB 41 977 5 977 977 41MB 42 981 5 981 981 17 41MB 43 830 7 512 830 17 48MB 44 830 10 65535 830 17 69MB 45 917 19 65535 918 yi 114MB 46 1224 65535 1223 17 152 47 USER USER USER USER USER USER Table 4 Standard Hard Drive Parameter Settings 16 20 Advanced Setup This menu permits the user to configure and setsome of the more complex settings forsystem components such as floppy drive swapping system caches shadow RAM control interrupt mapping Use the arrow keys tohighlight the icon labeled Advanced then press Enter The following screen appears American AMIBIOS Setup Megatrends C 1994 American Megatre
4. System Boot Up CPU Speed This option sets the speed of the CPU at system boot time The settings are High or Low L1 amp L2 Caches This option enables primary CPU and secondary cache memory If Enabled is selected the internal CPU cache and the external cache memory are enabled If Disabled is chosen all cache memory is disabled The settings are Enabled or Disabled Password Checking This option enables the password check option every time the system boots or the user runs Setup The selections are Always or Setup If Always is chosen a user password prompt appears every time the computer is turned on If Setup is chosen the password prompt appears if WINBIOS setup is executed and a password has been entered previously The Optimal and Fail Safe default settings are Setup Video ROM Shadow C000 16K Video ROM Shadow C400 16K These options when set to Enabled copy the video ROM area from C0000h C7FFFh to shadow RAM for faster execution The settings are Enabled or Disabled 23 American AMIBIOS Setup Megatrends lt C 1994 American Megatrends Inc fidvanced Setup Shadow C800 16K Shadow CC G 16K Shadow D G 16K Shadow D400 16K Shadow D800 16K Shadow DC00 16K IRQ4 IRQS Disabled Disabled Disabled Disabled Disabled Disabled Auto Auto Auto Set Advanced Features Figure 7 Advanced Setup Menu Page 3 of 5 Shadow C800 16K Shadow 00 16 Shadow D000 16K Shadow D400 16K Shado
5. 15 Main Menu Setup Screen Below is the Setup Main Menu American AMIBIOS Setup gt Megatrends lt 1994 American Megatrends Inc Setup Utility Lm fidvanced Chipset DetectMaster DetectSlave Peripheral Color Set 3 Password Anti Virus Set Date Time Floppy Hard Disk Figure 3 Main Setup Menu The Main Setup Menu is divided into four windows each with several submenu options Setup Window Security Window Standard Setup Password Advanced Setup Anti Virus Chipset Setup Peripheral Setup Default Window Original Settings Utility Window Optimal Settings Detect Master Hard Disk Fail safe Settings Detect Slave Hard Disk Color Set 16 Standard Setup This menu permits the user to configure and set system components such as time and date floppy drives and hard disk drives Use the arrow keys tohighlight the icon labeled Standard then press Enter The following screen appears American AMIBIOS Setup Megatrends 21984 American Megatrends Inc Utilitu Standard Setup cas Standard Floppy k Peripheral Securi Master Disk Slave Disk 5 gt Password Anti Virus Original Optimal Current Date Tue Jan 1 1980 Current Time 00 05 54 Figure 4 Standard Setup Menu Date Time This option permits the month day year hour minute and secondstored in CMOS to be changed Press l
6. no parity NexGen Internet Web Site www nexgen com NexGen Internet FTP Site ftp nexgen com 38 42 Notes Notes cont 44 Notes cont 45
7. Board Layout Hardware Installation Step by Step The installation of your Nx586 system board consists of6 basic steps your installation may vary depending on your system configuration Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Configure the system board Install the system board into your computer chassis Install the DRAM modules Install any internal PCI ISA peripherals Connect the monitor keyboard and other external peripherals Run the WINBIOS Setup program to configure your system board s memory hard drive and floppy drive parameters Step 1 Configuring the System Board The Nx586 system board options are configured through both software WINBIOS and hardware jumpers The software WINBIOS configuration settings are discussed in the Software Configuration section of this manual and the Technical Reference section of this manualists all of the jumper settings for the Nx586 system board We do not recommend changing ANY jumper settings unless the user is an experienced installer misuse of jumper settings can result in system board failure and or loss of warranty The factory default configuration for the onboard peripherals is Onboard serial ports Enabled as COM1 and COM2 Onboard parallel port Enabled as LPT1 Onboard floppy controller Enabled Onboard IDE controller Enabled Please refer to the appropriate section of this manual if you need to change any of these settings Step 2 Installing the System Bo
8. ISA Divisor Clock 2 4 Set Chipset Features Figure 10 Chipset Setup Menu Page 1 of 3 Alternate Instructions This option should be set to OFF for normal operation The settings are OFF or ON ISA 16 bit I O Delay Delay Count This option controls the minimum number of ISA clock cycles SCLK permitted between back to back 16 bit I O cycles to the ISA bus When enabled the PCI to ISA bridge controller will guarantee that the minimum delay period defined in the Delay Count field is present between 16 bit I O cycles When enabled the options are 6 7 8 or 9 SCLK periods ISA 8 bit I O Delay Delay Count This option controls the minimum number of ISA clock cycles SCLK permitted between back to back 8 bit I O cycles to the ISA bus When enabled the PCI to ISA bridge controller will guarantee that the minimum delay period defined in the Delay Count field is present between 8 bit I O cycles When enabled the options are 6 7 8 9 10 11 12 or 13 SCLK periods PCI to ISA Divisor Clock This option controls the divisor used to generate the ISA bus CLK SCLK from the PCI bus clock PCICLK The settings are divide by 3 or divide by 4 For example a system with a 32Mhz PCICLK with a divide by 4 setting results in a ISA bus speed of 8MHz 22 26 Memory Page Mode This option enables or disables the DRAM controller s use of page mode timing Page mode timing provides a performance improvement over no
9. click on the close box in the upper left corner of a window to close the window or exit from Setup 14 Exiting the Setup Program When finished making changes within Setup press the Esc key until the following menu shown in figure 2 appears Atthis point you are presented with the three choices described below American AMIBIOS Setup E Megatrends 1994 American Megatrends Inc Setup Utility E Exit Setup Ad Save changes and Exit ter DetectS lave Peripheral Do not save chakges and Exit Password Fail safe Securitu Set Date Time Floppu Hard Disk ALt H Help Figure 2 Exit Setup Menu Save Changes and Exit This option is used to save the changes made during this sessionin the Setup program then continue the boot process After pressing Enter with this option highlighted all settings that were modified are stored in CMOS RAMthen a CMOS RAM checksum is calculated and written to CMOS RAM Control is then passed to the ROMWINBIOS and the WINBIOS either reboots the system if any new setting changed the memory map or continues the booing process Do Not Save Changes and Exit This option passes control to the WINBIOS without writing any changesmade to the CMOS RAM Press Enter with this option highlightedto continue the boot process without saving any altered System parameters Continue Press Enter with this option highlightedto return to the main menu of the Setup program
10. k OMB Block Size 4KB Non cacheable Region 2 Disabled Base fiddress GMB Offset KB Block Size 4KB Set Advanced Features Figure 9 Advanced Setup Menu Page 5 of 5 21 25 Chipset Setup This menu configures chipset specific features These parameters have already been optimized for your system improper use of this utility could result in system failure Consult your dealer before attempting to use this option Several of the options in this section refer to NexBus clock periods NxCLK or clk This period is fixed at one half of the processor s clock speed For example a P100 processor operates at 93Mhz and a P90 processor operates at 84Mhz therefore the NXCLK periods would be 21 5ns for the P100 and 23 8ns for a P90 processor The PCI bus in the asynchronous mode operates at 32Mhz for both processors SCLK is the ISA bus clock witch is derived from the PCI bus clock This information and detailed specifications on the other components installed such as the DRAM is necessary before making any adjustments to these settings EN American AMIBIOS Setup Megatrends C 1994 American Megatrends Inc Setup Utility ES Chipset Setup etectSlave Alternate Instructions Off ISA 16 Bit 1 0 Delay Disabled 9 sclk Disabled 13 sclk Delay Count ISA 8 Bit I O Delay Delay Count Memory Page Mode Enabled Memory Read Prefetch Enabled CAS Low Time Read Z clk CAS Low Time Write Z clk Passwor Fail safe PCI to
11. DE LBA Mode Secondary IDE LBA Mode Set this option to Enabled if using an IDE drive that supports LBA Logical Block Address mode IDE drives with a capacity greater than 528 MB support LBA mode The settings are Enabled or Disabled The Optimal and Fail Safe default settings are Enabled Primary IDE Block Mode Secondary IDE Block Mode This option enables multiple sector reads and writes for IDE drives The settings are Enabled or Disabled The Optimal and Power On defaults are Enabled American AMIBIOS Setup Megatrends C 1994 American Megatrends Inc Setup Utilitu Peripheral Setup Drive 1 Mode fiuto Block Mode Both S3Z Bit Transfer Both etectSlave LBA Mode Both Secondary Device Installed Other Drive Mode Secondary Device 1 Installed Drive 1 Mode LR Block Mode Disabled Passuor Fail safe Set Peripheral Options Figure 14 Peripheral Setup Menu Page 2 of 3 Secondary Device 0 Installed Secondary Device 1 Installed These options determine whether there are any devices connected to the secondary IDE channel device 0 is the Master and device 1 is the slave device In general if you are installing an IDE CDROM or tape backup unit in general it is best to connect these devices to the secondary IDE connector The options are no none disk and other Use the disk selection for a hard disk and other for any other type of device 27 31 ES American AMIBIOS Setup gt Megat
12. P05 JP06 JP07 mP dp X 1 2 Onboard IDE with Legacy IRQ Default OUT OUT 2 3 2 3 Onboard IDE with PCI INT Onboard IDE disabled x don t care Onboard Serial Port Interrupts J07 1 2 3 4 COM to IRQ3 COM to IRQ4 Default 1 3 2 4 COM to IRQ3 COM to IRQ4 35 PCI BUS Clock JP12 IN Async PCI Bus Clock Default OUT Sync PCI Bus Clock CRT Type JP02 IN Color CRT OUT Mono Default Clear CMOS Memory JP20 IN Clear CMOS memory OUT Normal Default JP14 1 2 Set at factory do not change JP9 JP10 JP11 Set at factory do not change Connector Cable Diagrams Serial Cable DB 25M DB 9M IDC Header Connector Pin Connector Pin Signal Names Pin aper ME p DataCarrierDetect J04 J06 SSS Data Set Read 2 _ il 36 40 Parallel Cable DB 25M Connector Pin Signal Names Number 41 P4 EEHEEHE EEEE E 37 Technical Support If you encounter any problems during the installation or operation of your system please contact the dealer where you purchased the system If they are unable to resolve the problem check one of NexGen s on line support sites NexGen maintains a BBS Bulletin Board System a Internet FTP site and a Internet World Wide Web site These sites contain the latest driver and BIOS releases and answers to commonly asked questions NexGen BBS System 408 955 1839 14 4K bps 8 bits 1 stop
13. UP MENU 2 OF 19 FIGURE 7 ADVANCED SETUP MENU PAGE 3 OF5 20 FIGURE 8 ADVANCED SETUP MENU PAGE4 OF5 21 FIGURE 9 ADVANCED SETUP MENU PAGE 5 OF5 21 FIGURE 10 CHIPSET SETUP MENU PAGE 1 OF3 22 FIGURE 11 CHIPSET SETUP MENU PAGE 2 OF3 23 FIGURE 12 CHIPSET SETUP MENU PAGE3 OF3 24 FIGURE 13 PERIPHERALSETUP MENU PAGE OF3 26 FIGURE 14 PERIPHERALSETUP MENU PAGE OF3 27 FIGURE 15 PERIPHERALSETUP MENU PAGE3 OF33 28 List of Tables TABLE 1 PARTIAL DRAM COoNFIGURATIONLIST 7 TABLE 2 KEYBOARD USE WITHIN 10 TABLE 3 HARD DRIVE 5 15 TABLE4 STANDARD HARD DRIVE PARAMETER SETTINGS 16 TABLE 5 ADVANCED SETUP DEFAULT SETTINGS 32 TABLE CHIPSET SETUP DEFAULT SETTINGS 33 TABLE 7 PERIPHERAL SETUP DEFAULT SSETTINGS 33 Introduction Congratulations You have purchased a NexGen Nx586 system board part of the family of high performance
14. USER S MANUAL NexGen Nx586 PCI ISA System Board with on board Bus Master PCI IDE and Super I O October 2 1995 Designed for i 22225 e Microsoft Windows 95 DOC 720006 01 1 EX 1011 IPR of Pat No 5 836 013 NOTICE Copyright 1995 NexGen Inc ALL RIGHTS RESERVED No part of this document may be photocopied reproduced stored in a retrieval system transcribed or translated to another language in any form or by any means electronic mechanical magnetic optical chemical or otherwise without the prior written consent ofNexGen Inc NexGen Inc reserves the right to revise this document and make changes in the specifications of the product described herein at any time without notice and without obligation to notify any person of any such revision or change NexGen Inc makes no warranty express implied or statutory concerning this document or its use and assumes no responsibility for any omissions or errors which may appear in this document nor does it make a commitment to update the information contained in this document NEXGEN INC SPECIFICALLY DISCLAIMS LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE ACQUISITION USE OR SALE OR OTHER TRANSFER PERMITTED OR OTHERWISE OF THIS DOCUMENT OR THE USE OF THE PRODUCTS DESCRIBED IN THIS DOCUMENT NexGen NxPCI and NXMC are trademarks of NexGen Corporation Nx586 is a registered trademark of NexGen Corporation and WINBIOS are registered t
15. a virus warning message will be displayed when you attempt to format the hard disk drive If you select Continue formatting proceeds as normal If you do not want to continue formatting you may have to pressN several times depending on how many retries are performed by the upper level software DOS for example does at least five retries before the Format utility is actually aborted 29 33 Password Support WINBIOS Setup has an optional password feature The system can be configured so that all users must enter a password every time the system boots or when WINBIOS Setup is executed The following screen appears when you select the password icon You can enter a password by typing the password on the keyboard selecting each letter via the mouse or Setting a Password Setup Utilitu The password check option is Password enabled in Advanced Setup by choosing either Always the password prompt appears every time the System is powered on or Setup the password prompt appears only when 2 2 nua s s WINBIOS Setup is run The password is stored in CMOS RAM e e 8 The system asks for password x EI 2 2 Enter a 1 6 character password sJ Hv TES TES TEX 2 The password does not appear on the screen when typed WINBIOS will ask you to retype the password Make sure you write it down If you forget it you must drain CMOS RAM and reconfigure the syst
16. ard CAUTION Make sure to observe precautions for handling static sensitive devices Static electricity can harm components on your Nx586 system board and cause System failure The Nx586 system board is designed to fit into most standard AT Baby AT enclosures Follow the instructions for your particular chassis in order toinstall the Nx586 system board Make sure your chassis power supply can generate adequate power for your system board and peripherals For safety purposes NexGen recommends using only chassis that employ UL CSA or TUV certified power supplies WARNING The Nx586 processor requires adequate air flow to dissipate the heat generated by the processor Make sure that the processor fan is not obstructed and is operational If the fan is not working return the board to your dealer for an exchange 10 Step 3 Installing DRAM Modules The Nx586 system board accommodates six72 pin 32 bit or 36 bit DRAM SIMM modules When installing memory the DRAM speed for P90 and P100 systems must be 70ns or faster and must support fast page mode The six SIMM slots are labeled in pairs as Bank A Bank B and Bank C The banks may be populated in any order Bank C then Bank A then Bank B etc but both SIMMs within a bank must be installed at the same time with the same density 1M 2M 4M of DRAM module Any of thefollowing single density SIMMs 1M 4M or 16M or double density 2M 8M or 32M SIMM modules may be used Ta
17. bilities of the device connected to the parallel port The default setting is Normal mode IDE Hard Disk Standby This option controls whether the IDE hard drives are told to spin down after a selected time interval When enabled the IDE drives will be told to power down after a period of inactivity resulting in reduced system power consumption When set to disabled the IDE drives will never be told to power down The selections are disabled 20 seconds 1 minute and 10 minutes Primary Drive 0 Mode 26 30 Primary Drive 1 Mode These options control the transfer mode and rate between the selected IDE drive and the system When set to Auto the BIOS will interrogate the drive upon boot up and select the optimum PIO transfer mode Selecting any other option will force the drive into the particular mode selected The DMA transfer modes can only be enabled by manually selecting them Under some conditions the DMA mode will provide better performance however many IDE drives that purport to be compatible in truth are not Warning selecting a mode which is beyond the capabilities of your drive will result in system failure and potential data loss on the hard drive Primary IDE 32 Bit Transfer Secondary IDE 32 Bit Transfer This option enables 32 bit data transfers on the IDE data port If disabled 16 bit data transfer is used by the WINBIOS The settings are Enabled or Disabled The Optimal and Fail Safe default settings are Enabled Primary I
18. ble 1 1 shows a short list of the possible memory configurations DRAM Configurations SIMM 10f2 1MB x32 1MB x 32 8 MB 2MB x 32 2MB x 32 16 MB 4MB x 32 4MB x 32 32 MB 8MB x 32 8MB x 32 64 MB 2MB x 32 2MB x 32 1MB x 32 1MB x 32 24 MB 2MB x 32 2MB x 32 2MBx 32 2MB x 32 32 MB 2MB x32 2MB x 32 4MB x 32 4MB x 32 48 MB 2MB x 32 2MB x 32 8MBx 32 8MB x 32 80 MB 4MB x 32 4MB x 32 2MBx 32 2MBx 32 1MBx 32 1MB x32 56 MB 4MB x32 4MB x32 2MBx 32 2MB x32 2MBx 32 2MB x 32 64 MB 4MB x 32 4MB x 32 2MBx 32 2MBx 32 4MBx 32 4MB x 32 80 MB 4MB x 32 4MB x 32 2MB x 32 2MB x 32 8MB x 32 8MB x 32 112 MB 8MB x 32 8MB x 32 4MB x 32 4MB x 32 1MB x 32 1MB x 32 104 MB 8MB x 32 8MB x 32 4MB x 32 4MB x 32 2MB x 32 2MBx32 112 MB 8MB x 32 8MB x 32 4MBx 32 4MBx 32 4MBx 32 4MBx32 128MB 8MB x 32 8MB x 32 4MB x 32 4MB x 32 8MB x 32 8MB x 32 160 MB 8MB x 32 8MB x 32 8MB x 32 8MB x 32 1MB x 32 1MB x 32 136 MB 8MB x 32 8MB x 32 8MB x 32 8MB x 32 2MB x 32 2MB x 32 144 MB 8MB x 32 8MB x 32 8MB x 32 8MB x 32 4MB x 32 4MB x 32 160 MB 8MB x 32 8MB x 32 8MB x 32 8MB x 32 8MB x 32 8MB x 32 192 MB Table 1 Partial DRAM Configuration List 11 Step 4 PCI ISA Bus Adapter Installation Procedure To install a PCI or ISA Bus adapter card 1 Locate a free PCI or ISA Bus slot on the system board either a PCI or ISA sl
19. ce in sector size by boosting the write current for sectors on inner tracks This parameter is the track number where write precompensation begins Lz Landing Zone This number is the cylinder location where the heads will normally park when the system is shut down Sec Sectors The number of sectors per track Hard drives that use MFM have 17 sectors per track RLL drives have 26 sectors per track RLL and ESDI drives have 34 sectors per track SCSI and IDE drives may have even more sectors per track Size The formatted capacity of the drive based on the following formula Number of heads x Number of cylinders x number of sectors per cylinder x 512 bytes per sector Table 3 Hard Drive Configurations IDE EIDE drives can be configured simply by using the DetectMaster and DetectSlave commands in the Utility Window Older ST 506 MFM type hard drives require manual selection of these parameters The WINBIOS provides a table with 46 of the most common parameters for these drives Also a 47th entry can be used to enter any configuration not found in the table Refer to your hard disks manual for the proper settings if you have this type of drive 15 19 Type Cyls Heads Write Landing Sectors Capacity Precomp Zone 1 306 4 128 305 17 10MB 2 615 4 300 615 Jy 20MB 3 615 6 300 615 17 31MB 4 940 8 512 940 y 62MB 5 940 6 512 940 17 47MB 6 615 4 65535 615 We 20MB 7 462 8 256 511 17 31MB 8 733 5 65535 733 174 30MB 9 900 15 65535 901
20. drives will be exactly the ones reported by the drive The user is not allowed to override these settings Type Cyl Size MB ot Installed 306 4 128 305 615 300 615 17 19 615 300 615 940 512 940 940 512 940 615 65535 615 462 256 511 18 Hard Disk Configuration Hard disks are available with many different types of interfaces and controller options The WINBIOS has built in support for several of the most common interface standards IDE EIDE SCSI ESDI and ST 506 MFM In general depending on the controller used the WINBIOS needs to be configured to recognize the hard drives connected The most common type of hard disk today uses the IDE or EIDE interface This type of drive is very simple to install and configure The Nx586 system board supports up to four IDE EIDE devices using a primary and a secondary IDE channel Each channel supports up to two IDE EIDE drives or other IDE ATAPI devices such as CDROMs or Tape Backup devices Hard drives are identified by several parameters Parameter Description Type The number designation for a drive with certain identification parameters Cyl Cylinders The number of cylinders in the disk drive Hd Heads The number of heads WP Write Precompensation The size of a sector gets progressively smaller as the track diameter diminishes Yet each sector must still hold 512 bytes Write precompensation circuitry on the hard disk compensates for the physical differen
21. em Enter Neu Password Changing a Password Select the Password icon from the Security section of the WINBIOS Setup main menu Enter the password and press Enter The screen does not display the characters entered After the new password is entered retype the new password as prompted and press Enter If the password confirmation is incorrect an error message appears If the new password is entered without error press Esc to return to the WINBIOS Setup Main Menu The password is stored in CMOS RAM after WINBIOS Setup completes The next time the system boots you are prompted for the password if the password function is present and is enabled Remember the Password Keep a record of the new password when the password is changed 30 34 Default Window This window contains three options Original Optimal and Fail safe These three options set all of the Advanced Chipset and Peripheral settings to preprogrammed values by the factory Under most conditions the optimal Optimal Fail safe settings should be used to achieve the best overall system performance If you experience any abnormal system behavior try using the Fail safe settings If you change your mind after selecting either the Optimal or Fail safe settings before you save changes and exit the Original menu can be used to restore and modified parameters to their original values when you entered Setup Original Choose the O
22. et addresses PCI Master Locking Utilitu T etectSlave Disabled Enabled Disabled High Enabled Enabled Disabled Enabled Disabled Enabled I Fail safe ALt H Help This option when enabled causes the NexBus to become locked during write access by a PCI Bus Master In most cases this option should be disabled to permit the NexBus to operate independently from the PCI bus PCI Master Read Prefetch Enables the NxPCI to use the prefetch buffers to read ahead data on the NexBus for PCI Bus masters Frame Write Merging Enables byte word double word merging of writes to the video frame area This option permits multiple 8 bit or 16 bit writes to be combined to a single 16 or 32 bit write by the NxPCI 24 28 Frame to PCI Write Burst Permits the gathering of multiple writes to the video frame area into a single PCI write burst cycle VGA Frame Buffer A0000 BFFFF Enables the 128K address space from A0000 BFFFF as a prefetchable video frame buffer region CPU Stop Clock on Halt When enabled the internal processor clock is stopped after the execution of a HALT instruction This feature permits the processor to enter a low power state when idling waiting for an event to occur Dual ported PCI Adapter Latency The settings are High or Low 25 29 Peripheral Setup This menu configures chipset specific features These parameters have already been optimized for your system improper use of this utility c
23. h Enabled PCI Master Locking Disabled CAS Low Time Read 2 Master Read Prefetch Enabled CAS Low Time Write 2clk Write Merging Disabled CAS Precharge Time 1 to PCI Write Burst Enabled Memory Hole 80000 9FFFF Disabled VGA Frame Buffer A0000 BFFFF Enabled Memory Hole E00000 FFFFFF Disabled CPU Stop Clock on Halt Disabled High BIOS Map Enabled Table 6 Chipset Setup Default Settings Peripheral Setup Embedded ISA Peripheral Setup Auto Primary IDE LBA Mode Both OnBoard FDC Enabled Secondary Device 0 Installed No Serial Port1 3F8H Drive 0 Mode N A Serial Port2 2F8H Secondary Device 1 Installed N A Parallel Port 378H Drive 1 Mode N A Parallel Port Mode Normal Block Mode N A IDE Hard Disk Standby Disabled 32 bit Transfer N A Primary Drive 0 Mode Auto LBA Mode N A Drive 1 Mode Auto PCI IDE Add on Card Slot Absent Block Mode Both PCI IDE IRQ Connected to N A 32 bit Transfer Mode Both Table 7 Peripheral Setup Default Settings 33 37 34 This page is intentionally left blank 38 Technical Reference Nx586 System Board Jumper Settings Connectors Reset Switch INA Speaker connector Keylock Power LED connector 12 Fan connector REM Turbo LED connector PCI bus slots 16 bit ISA slots LZ Power connector Keyboard connector Extended Capabilities Parallel Port ECP Mode DMA Selection Onboard IDE JP04 J
24. n page mode DRAM Most DRAMs starting with the 1Mbit and later generation permit page mode operation The default setting is enabled Memory Read Prefetch The NxMC memory controller contains read prefetch buffers which minimize the latency involved in sequential reads from DRAM When enabled the NxMC attempts to have the next anticipated read data from the DRAM available to the processor in the zero wait state prefetch buffers The settings are enabled and disabled CAS Low Time Read This option controls the number of NxCLK periods that the CAS signal is low active during DRAM read cycles CAS Low Time Write This option controls the number of NxCLK periods that the CAS signal is low active during DRAM write cycles The settings are 1 or 2 NXCLK periods American AMIBIOS Setup gt Megatrends C 1994 American Megatrends Inc Utilitu E Chipset Setup etectSlave CAS Precharge Time 1 clk Memory Hole 80008 9 Disabled Memory Hole Disabled High BIOS k Enabled RAS Low High Time 4 Frame Read firound Hrite Enabled CPU to PCI Write Buffer Enabled PCI Fast Write Enabled PCI Bus Resource Lock Disabled NexBus PCI Concurrent Mode Enabled Set Chipset Features Figure 11 Chipset Setup Menu Page 2 of 3 CAS Precharge Time This option controls the minimum number of NxCLK periods that the CAS signal will be high inactive during required CAS precharge intervals The
25. nabled the WINBIOS memory test is performed on all system memory When this option is disabled the memory test is done only on the first 1 MB of system memory The settings are Enabled or Disabled Memory Test Tick Sound This option enables turns on or disables turns off the ticking sound during the memory test The settings are Enabled or Disabled 21 Parity Error Check This option enables or disables parity error checking for system DRAM The settings are Enabled all system DRAM parity is checked or Disabled no parity is checked on any system DRAM Parity checking should only be enabled when 36 bit SIMM modules are used If 32 bit SIMMs are mixed with 36 bit SIMMs parity checking must be disabled Hit DEL Message Display Disabling this option prevents the message Hit DEL if you want to run Setup from appearing when the system boots The settings are Enabled or Disabled Extended BIOS RAM Area Specify in this option if the top 1 KB of the system programming area beginning at 639K or 0 300 in the system BIOS area in low memory will be used to store hard disk information The settings are Top 1K or 0 300 Wait for F1 If Any Error WINBIOS POST runs system diagnostic tests that can generate a message followed by Press F1 to continue If this option is enabled WINBIOS waits for the end user to press F1 before continuing If this option is disabled WINBIOS continues the boot process without waiting fo
26. nds Inc m Utility Twana fidvanced Setup etectSlave Typematic Rate Chars Sec System Keyboard TS Primary Display 25 Boot with PnP OS Disabled Above 1MB Memory Test Disabled Memory Test Tick Sound Enabled Paritu Error Check Disabled Hit DEL Message Display Enabled Extended BIOS rea 0 300 Wait For Fi If Any Error Enabled m Passwor Fail safe Set Advanced Features Figure 5 Advanced Setup Menu Page 1 of 5 Typematic Rate Chars Sec Typematic Rate sets the rate at which characters on the screen repeat when a key is pressed and held down The settings are 15 20 24 or 30 characters per second System Keyboard This option does not specify if a keyboard is attached to the computer Rather it specifies if error messages are displayed if a keyboard is not attached This option permits you to configure workstations with no keyboards The settings are Absent or Present Primary Display Select this icon to configure the type of monitor attached to the computer The settings are Monochrome Color 40x25 Color 80x25 VGA PGA EGA or Not Installed Boot with PnP OS This option controls whether the BIOS or the OS gets to configure certain aspects of PnP compatible features In general this option should be set to disabled which permits the BIOS to control the PnP features unless you are exclusively using a PnP compatible operating system Above 1 MB Memory Test When this option is e
27. on sectiondescribes the WINBIOS setup e The Technical Reference sectiondescribes the jumper and switch settings for the Nx586 System board Checklist The following items are included with your Nx586 system board package 586 system board This manual 2serial 1 parallel 1 IDE and 1 floppy drive cable s Diskette with device drivers for the on board IDE controller If you suspect that any of the items in the system unit package have been damaged or that items are missing contact your reseller immediately Hardware Setup Overview This section provides instructions for installing and setting up your Nx586 system board installing memory modules and PCI ISA BUS peripherals It also contains a diagram of the system board see Figure 1 System board Layout next page for reference purposes To rurthe WINBIOS setup see the Software Configuration Sectionfor the AMI WINBIOS CAUTION The procedures described are meant as general guidelines for the experienced installer Contact your dealer if you are unsure about the installation or if you need more detailed information about any portion of the installation process System Board Layout Familiarize yourself with the components of the Nx586 system board t cun D 0000000 s Ju om immu t ME d e lo Sg
28. ot whichever is appropriate for the card to be installed 2 Remove the appropriate expansion slot cover plate from the chassis 3 Line up the adapter along the slotto be used and insert the gold edged connectors into the connector on the motherboardcompletely Make sure that the adapter is well seated in the slot Secure the adapter to the chassis with a slot cover screw 4 The system should automatically recognize the added adapter If you have added a video adapter and wish to use the extended video modes you may have to install additional drivers corresponding to the programs and environments used Step 5 Connecting External Peripherals Connect your monitor keyboard mouse AC power cord and other external devices to your chassis before powering on the system Step 6 Running WINBIOS Setup Once the motherboard has been mounted in the case and all of the peripherals connected the final step is to run the WINBIOS setup program When the system is turned on for the first time the WINBIOS will notice the addition of DRAM memory and other peripherals and prompt you to enter the setup utility The next section of this manual describes the use ofthe AMI WINBIOS Setup utility in configuring your system After running Setup you can proceed with installation of system and application software 12 Software Configuration of System Board Components AMI WINBIOS Setup Introduction The WINBIOS setup is aprogram in the Flash ROM pe
29. ould result in system failure Consult your dealer before attempting to use this option American AMIBIOS Setup gt Megatrends C 1994 American Megatrends Inc Parallel Port Mode Normal IDE Hard Disk Standby Disabled Primary Drive Mode Auto Drive 1 Mode Auto Block Mode Both Set Peripheral Options Figure 13 Peripheral Setup Menu Page 1 of 3 Embedded ISA Peripheral Setup This option controls whether the BIOS is allowed to automatically control the settings for the onboard peripherals serial parallel and floppy ports or if the user manually controls their settings in setup When set to Auto the BIOS will enable disable or remap the onboard I O devices to eliminate conflicts with I O ports on adapter cards The selections are Auto or Manual When set to manual the following options can be controlled by the user Onboard FDC This setting enables or disables the onboard floppy controller Serial Port1 Serial Port2 These options determine the base address for the two onboard serial ports The selections are disabled O3F8H COM1 02F8H COM2 03E8H COM3 and 02E8H Parallel Port This option controls the base address for the onlpard parallel port The options are disabled 3BCH 378H and 278H Parallel Port Mode This options controls the functionality of the onboard parallel port The options are Normal and Extended ECP Extended Capabilities Port mode This option should be set to match the capa
30. personal computer products fromNexGen This motherboard has been designed to fit in most standard AT and baby AT enclosures To avoid damage to your system please read the installation section thoroughly before attempting to install the motherboard or configure your system This chapter describes the many features of the 586 PCI ISA system board This chapter also provides an overview of this manual to help you locate information quickly Features The NexGen Nx586 system board includes the following features e Supports NexGen Nx586 processors with 32KB level 1 cache NexGen NxPCI NxMC chipset High performance 256KB write back secondary cache e Supports up to 192MB of main memory on boardusing 72 pin SIMM DRAM Fast Mode memory modules Three 32 bit PCI 2 0 compatible local bus expansion slots with bus mastering capability four 16 bit ISA Expansion slots with one shared slot position AMI WINBIOS with Plug and Play support On board Super I O with 2 serial ports 1 parallel port and floppy controller e On board Dual Channel Bus Mastering PCI IDE controller Flash BIOS support for easy upgrading 3 year limited warranty About This Manual This manual is organized as follows The Hardware Setup sectiondescribes how to install and set up the Nx586 system board memory and peripherals Included in this section are the motherboard layout memory table The Software Configurati
31. r F1 to be pressed The settings are Enabled or Disabled 22 Amer ican AMIBIOS Setup Megatrends C 1994 American Megatrends Inc Setup Utility EE fidvanced Setup Standar etectSlave Keuboard Num Lock Floppy Drive Seek At Boot Disabled Floppy Drive Swapping Disabled Sustem Boot Up Sequence cz Sustem Boot Up Speed High Li amp LZ Caches Enabled Password Checking Setup Video Shadow C000 16K Enabled Video Shadow C400 16K Enabled Passwor Set Advanced Features Figure 6 Advanced Setup Menu Page 2 of 5 Keyboard Num Lock When On this option turns off Num Lock when the system is powered on so the end user can use the arrow keys on both the numeric keypad and the keyboard The settings are On or Off Floppy Drive Seek At Boot When this option is enabled the WINBIOS performs a Seek command on floppy drive A before booting the system The settings are Enabled or Disabled Floppy Drive Swapping When this option is enabled the WINBIOS will swap the A and B floppy drives without the need to change any physical cabling or jumpers This feature is handy when you have two drives of different types i e 1 2MB and 1 44MB and you need to boot at times from the drive installed as drive B System Boot Up Sequence This option sets the sequence of boot drives either floppy drive A or hard disk drive C that WINBIOS attempts to boot from after POST completes The settings are or A C
32. rademarks of American Megatrends Inc Microsoft WindowsA95 and the Windows logo are registered trademarks of Microsoft Corporation First printing October 1995 WARNING FOR CONTINUED PROTECTION AGAINST FIRE REPLACE FUSE WITH SAME TYPE AND RATING FUSE RATING 1A 125V THE USER IS CAUTIONED THAT CHANGES OR MODIFICATIONS NOT EXPRESSLY APPROVED BY THE MANUFACTURER COULD VOID THE USER S AUTHORITY TO OPERATE THIS EQUIPMENT Table of Contents INTRODUGTIQN 6 ein one qu e sona on u a eap Ne Pn TaS 1 BEATURES 1 ABOUT DHIS MAANUAT 2 CHECKLIST petere 2 HARDWARE SETUDBP 3 OVERVIEW ect ee EE gay A VERE ee 3 SYSTEM BOARD LAYOUT u tanpu ni tenete 4 HARDWARE INSTALLATION STEP BY 5 5 Step 1 Configuring the System Board sse 5 Step 2 Installing the System Board seen 6 Step 3 Installing DRAM Modules sese 7 Step 4 PCI ISA Bus Adapter Installation Procedure 8 Step 5 Connecting External Peripherals eee 8 Step Running WINBIOS Setup a SOFTWARE CONFIGURATION OF SYSTEM BOARD 8 4717 4 1 sees ee teet esas esee sette etas eese ee 9 AMIWINBIOS SETUP eR eee reu a LES 9
33. rends C 1994 American Megatrends Inc Utility letectS lave Secondary Device Installed Drive Mode Secondary Device 1 Installed Drive 1 Mode Block Mode 32Z Bit Transfer LBA Mode PCI IDE Add on Card Slot Disabled Disabled Disabled Absent Set Peripheral Options ALt H Help Figure 15 Peripheral Setup Menu Page 3 of 3 PCI IDE Add on Card Slot PCI IDE IRQ Connected to These options control the setup of IDE adapters installed in the PCI slots Normally the WINBIOS automatically detects and configures PCI IDE adapters If a non compliant PCI IDE adapter is installed and not recognized by the WINBIOS use this option to enter the slot and IRQ used by the adapter In order for this type of adapter to function properly the BIOS needs to know if such an adapter is installed and which IRQ is used Utility Window This window contains three options DetectMaster DetectSlave and Color Set The DetectMaster option Utilitu allows IDE EIDE hard disks to be automatically detected configuring the proper number of heads cylinders and m sectors to make full use of the drive The DetectSlave option performs the same operation for the slave or 2nd petectS ave IDE hard disk installed in the system The Color Set option allows you to control the color settings for optimal viewing on all type of displays Color Set Security Window This window contains two menus Password and Anti Virus The Password menu allow
34. riginal icon to return to the system configuration values present in WINBIOS Setup when you first began this WINBIOS Setup session Optimal You can load the optimal default settings for the WINBIOS Setup options by selecting the Optimal icon The Optimal default settings are best case values that should optimize system performance If CMOS RAM is corrupted the Optimal settings are loaded automatically Fail Safe You can load the Fail Safe WINBIOS Setup option settings by selecting the Fail Safe icon from the Default section of the WINBIOS Setup main menu The Fail Safe settings provide far from optimal system performance but are the most stable settings Use this option as a diagnostic aid if the system is behaving erratically 31 35 Factory Recommended CMOS Settings The factory recommended settings are listed below These settings should be used in the event CMOS RAM has been corrupted or for some reason you wish to reset CMOS to the factory s recommended settings However if your hard disk does not have an operating system change the setting at System boot up sequence to A C For Adapter ROM shadowing enable shadow whenever appropriate i e adapter card has on board BIOS CAUTION Users are not encouraged to change Advanced CMOS settings unless they are familiar withconfiguring system parameters Improper use of these utilities can result in System failure Advanced CMOS Setup Typematic Rate Chars sec 30 Shado
35. rmanent memory of your system board that configures the DRAM date and time the typeand number of hard disks connected and virtually all of the main system level components TheWINBIOS Setup values may have already been set prior to shipment A record of the system parameters such as amount of memory types of disk drives video display numeric coprocessor and other peripherals is stored in a special area of memory called CMOS RAM When the computer is turned off a backup battery provides power to the CMOS RAM thereby retaining your system configuration The backup battery contained on this motherboard is rated for a 10 year average life Each time the system is turned on it is configured with the valuesstored in the CMOS RAM unless the CMOS RAM was corrupted If for some reason the CMOS RAM is corrupted the system is configured with the default values stored in theFlash ROM There are two sets of WINBIOS values stored in the Flash ROM the WINBIOS Setup default values and the Power On default values Note Your system may have been pre configured prior to shipment It is only necessary to execute the configurationprogram if A You have changed the hardware configuration i e added memory added or removed drives etc The system itself has detected an error while booting up and requires you to reconfigure CMOS RAM Users are not encouraged to run this setup program unless theyare familiar with it Improper use of this setup p
36. rogram can result in system failure 13 Running the WINBIOS Setup When the system power isturned on the computer performs a series of device initializations and diagnostic tests During this process the system will allow you to interrupt the process and run Setup by pressing the Del key Whenthe Power On Self Test POST has completed the following message appears Press the Del key to enter the Setup program Once inside the Setup program either a mouse or the keyboard can be used to maneuver and modify the setup parameters The table below describes special keys used to perform certain functions within the Setup program Keystroke TAB Move to the next window or field 3 1 Moves cursor from one option to the nextwithin a window or menu lt ENTER gt Select item highlighted Increments a value Decrements a value lt Esc gt Returns to previous screenor menu also used to exit setup lt PgUp gt Returns to the previous page lt PgDn gt Advances to the next page lt Home gt Returns to the beginning of the text lt End gt Advances to the end of the text lt Alt gt lt H gt Displays Help screen lt Alt gt lt SPACE gt Global Exit Setup from any menu Table 2 Keyboard Use Within Setup The WINBIOS will also recognize most PS 2 serial and in port style mice The mouse click functions are single click to change or select items double click to perform an operation in the current field
37. s you to set a password that will be required each time the system is Security turned on If you forget your password you will need to use the CLEAR CMOS jumper to erase the S password Doing this will also clear all of the other Passuord Anti Virus settings which you have made in any of the setup menus 28 32 Boot Sector Virus Protection When this option is enabled WINBIOS issues a warning when any program or virus issues a Disk Format command or Virus Protection attempts to write to the boot sector of the hard disk drive The settings are Enabled or Disabled If enabled the following is displayed if any program attempts to write to the boot sector You may have to type N several times to prevent the boot sector write Disabled Enabled Boot Sector Write Possible VIRUS Continue Y N _ The following is displayed if any program attempts to format any cylinder head or sector of any hard disk drive via the BIOS INT 13 Hard Disk Drive Service Format Possible VIRUS Continue Y N Formatting the Hard Disk Drive You should not enable anti virus protection when formatting a hard disk drive The DOS hard disk Format utility does not use INT 13h function AH 05h to format the hard disk It only verifies the hard disk using the INT 13h Verify function AH 04h The virus warning message is not displayed during DOS hard disk drive formatting If the anti virus feature is enabled
38. settings are 1 or 2 NxCLK periods Memory Hole 80000 9FFFF This option forces a hole in the DRAM memory space between 512K 640K This feature would be used if you had a adapter card that could only be memory mapped in the lower 640K address space Under normal operation this option should be set to disabled Memory Hole E00000 FFFFFF This option forces a hole in the memory space between 14MB 16MB Note that DOS will not size memory past any memory holes found in the DRAM space Therefore if this feature were enabled and more than 16MB of DRAM were installed only the first 14MB of DRAM would be useable to DOS and applications UNIX operating systems do not have this limitation This feature should be disabled under normal operation High BIOS Map When enabled this feature permits the system BIOS to be visible at just below both the 1MB and the 4GB address boundaries Setting this feature to disabled will prevent the BIOS from being visible at the 4GB address space Under normal operation this feature should be left enabled 23 27 RAS Low High Time This option controls both the minimum RAS low active time and the RAS precharge time Frame Read Around Write This option refers to the video frame buffer The NxPCI controller contains both read and write buffers to the video frame area This option when enabled allows read cycles to the video frame to bypass pending writes in the video frame write buffers CPU to PCI Write Buffer The N
39. t Enter gt to bring up the modification screen then move the cursor to the fieldyou wish to change by using the arrow keys Change the setting by Date Time using and keys or entering the value directly Mon 25 1995 with the keyboard The time uses a 24 hour clock i 10 38 49 format For P M numbers add 12 to the hour 4 30 P M is 16 30 00 17 Floppy Drives A and B The WINBIOS supports 720KB 1 44MB and 2 88MB 3 5 inch drives 360KB and 1 2MB 5 25 inch drives Move the cursor to either field with the arrow keys and set the appropriate floppy Installed drive type using the arrow keys then press Enters 5 Master and Slave Disks Hard disk types from 1 to 46 are industry standard The USER type is user definable and can be used for both the master and slave drive If the USER type is selected the user must enter the proper hard drive parameters from the keyboard The parameters forthe USER type under the master hard disk and slave hard disk can be different which allows two different user definable hard disk drives in the System Not Installed can be used for diskless workstations The two remaining settings are for ESDI and SCSI hard disks The WINBIOS only supports manual drive parameter selection for hard drives connected to the primary IDE channel Any hard drives connected to the secondary IDE channel will be auto detected during POST The parameters used for these
40. w D400 16K Disabled System Keyboard Present Shadow D800 16K Disabled Primary Display VGA EGA Shadow DC00 16K Disabled Boot with PnP OS Disabled IRQ3 Auto Above 1M Memory Test Disabled IRQ4 Auto Memory test tick sound Enabled IRQ5 Auto Parity Error Check Disabled IRQ7 Auto Hit lt DEL gt Message Display Enabled IRQ9 Auto Extended BIOS RAM Area 0 300 IRQ10 Auto Wait for F1 if any error Enabled IRQ11 Auto Keyboard Num Lock On IRQ12 Auto Floppy Drive Seek at Boot Enabled IRQ14 Auto Floppy Drive Swapping Disabled IRQ15 Auto System Boot Up Sequence Non Cacheable Region 1 Disabled System Boot Up High Starting Base Addr OMB L1 amp L2 Caches Enabled Offset OMB Password Checking Setup Block Size 4KB Video Shadow C000 16K Enabled Non Cacheable Region 2 Disabled Video Shadow C400 16K Enabled Starting Base Adar OMB Shadow C800 16K Disabled Offset OMB Shadow CC00 16K Disabled Block Size 4KB Shadow D000 16K Disabled Table 5 Advanced Setup Default Settings 32 36 Chipset Setup Alternate Instructions Off RAS Low High Time 4 ISA 16 bit Delay Disabled Frame Read Around Write Enabled Delay Coun 9sclk CPU to PCI Write Buffer Enabled ISA 8 bit I O Delay Disabled PCI Fast Write Enabled Delay Coun 13 Bus Resource Lock Disabled PCI to ISA Divisor Clock PCIcIk 4 Concurrent Mode Enabled Memory Page Mode Enabled PCI Master Read Around Write Enabled Memory Read Prefetc
41. w D800 16K Shadow DC00 16K These options enable shadowing of the contents of the ROM area named in the option title The settings are Enabled or Disabled The ROM area that is not used by ISA adapter cards will be allocated to PCI adapter cards IRQ3 IRQ4 IRQ5 IRQ7 IRQ9 IRQ10 IRQ11 IRQ12 IRQ14 IRQ15 These options control whether the selected interrupt line is assigned to an ISA peripheral or left to be automatically assigned by the BIOS or PnP OS to either a PCI device or an ISA device The selections are AUTO or ISA 20 24 AMIBIOS Setup 21894 American Megatrends Inc Advanced Setup IRQS IRQ16 Auto 180911 fiuto 18912 Auto IRQ14 Auto IRQ15 Auto Non cacheable Region 1 Disabled Base Address GMB Offset KB Block Size 4KB Set Advanced Features Figure 8 Advanced Setup Menu Page 4 of 5 Non cacheable Region 1 Non cacheable Region 2 These options along with the Base address Offset and Block Size options permit two areas of memory to be defined as non cacheable These options are useful for defining areas of memory which for some reason should not be cached by the processor An example would be a memory mapped network card or other memory mapped peripheral American AMIBIOS Setup Megatrends lt C 1994 American Megatrends Inc Setup Advanced Setup Standar IRQ14 18915 Auto Non cacheable Region 1 Disabled Offset Peripher Base fiddress
42. xPCI controller provides a write buffer between the CPU and the PCI bus to improve system performance This option controls the enabling and disabling of these write buffers PCI Fast Write This option enables the use of 0WS write cycles to the PCI bus The settings are Enabled or Disabled PCI Bus Resource Lock When enabled this feature permits PCI Bus Masters to interrupt other Bus Masters if they are targeting another resource not currently in use When disabled other Bus Masters are not permitted to interrupt locked cycles This feature should be disabled under most situations Concurrent Mode This option permits the NexBus and the PCI bus to operate independently whenever possible When set to disabled an access on either bus ties up both buses AMIBIOS Setup C 1994 American Megatrends Inc American gt Megatrends Passwor Setup Chipset Setup PCI Bus Resource Lock NexBus PCI Concurrent Mode PCI Master Read Around Write PCI Master Locking PCI Master Read Prefetch Frame Write Merging Frame to PCI Write Burst VGA Frame Buffer AGGGG BFFFF CPU Stop Clock on Halt Dual ported PCI Adapter Latency Set Chipset Features Figure 12 Chipset Setup Menu Page 3 of 3 PCI Master Read Around Write When enabled this feature permits read requests from PCI Masters to main memory to bypass pending write requests in the PCI write buffers as long as the read request is not to one of the write targ
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