486SH_VL-Bus_System_Board_User
Contents
1. A ry JN A Y i e b y h e PR A e A Ur ia s y gt pe ae la PO gh o gt y p eN o s A _ i yi A po Ra a e O ART gt so 7 os s o w gt v e e Y o y 1 Y Pro ats re F gt e E P A q 2 i wie 8 r La an A k ae e a f is a IA gt 5 te E b A pl lt een yh Zm Syst em USER S MANUAL ve ig De p ig lt A pe gt 7 2 gt noth te A q o Ae 5 Board 486SH Bus System Board USER S MANUAL Revision 1 1 111 WARNING I Be careful while installing VESA Local Bus cards on to your system board Keep the following tips in mind to properly install and remove a VESA Local Bus card 1 Always install remove the card vertically straight down up Never at an angle Inserting the card at an angle may damage the pins in both the AT and VESA Local Bus slots 2 To install the board vertically hold the card in the middle Make sure that the card is even with both slots Then gently fit the card into the slots with equal pressure at both ends VL BUS SLOT AT SLOT 486SH QUICK REFERENCE PREFACE I STANDARD CMOS SETUP2. DRAM Hidden Refresh Select Enabled to maximize system performance Cache Write Cycle Cache Burst Read Cycle Follow below table to set these Cache options 20MHz or 26MHz 33MHz with 64KB or 256KB Cache 2 3 33MHz with 128KB cache T T T T T ISA Bus Clock Default setting is 7 16MHz for any CPU speed Latest ISA adapters may operate with ISA bus clock speed up to 1OMHz ISA bus speed above 10MHz is not recommended Different than 7 16MHz speed can also be selected by following below table 4 2 CLK LOMEIZ or 1 3 CLK 6 67MHz 25MHz 1 3 CLK 8 33MHz 33MHz 1 4 CLK 8 33MHz 40MHz 1 4 CLK 10MHz or 5OMHz 1 5 CLK 10MHz or Latch Local Bus Device Local Bus Ready Follow below table to set these options ODO AN OOOO OOOO DONA MMM COR eee gt OOOO PIDO AO SA BORACAY AAA GOOD Sea RA BD Wd EDDIE ODE PODER nie DD see et sete a ae ere ee a ste a E ER DRI IE OO ODO OOOO OOOO OOOO OOOO IRR EI III MMMM MIN MMR RMN RD Page 24 486SH System Board User s Manual A86SH System Board User s Manual Page 25 POWER MANAGEMENT SETUP The Power Management Setup provides a programming way to slow down CPU clock speed and put other system devices such as Video Monitor into power saving mode There are five software timers internal to the MEGAKEY keyboard controller that perform power management These timers are initialized by BIOS with user defined time out values from 1 to 25
3. Date Current date a Tino Rat timo E Thank you for purchasing the 486SH system board This document Hard Disk C Type Hard disk parameters 3 gives an aid to the configuration and installation of this system Hard Disk D Type Hard disk parameters j board Floppy Drive A Type of floppy drive installed q Flo Drive B Type of flo drive installed a Poppy Ai Type Bel dub dar e D 4 The information in this document is subject to change without Keyboard Installed notice ll ADVANCED CMOS SETUP Ra a This document contains information protected by copyright All Typematic Rate Programming Disabled rights are reserved No part of this document may be used or Typematic Rate Delay eae reproduced in any forms or by any means or stored in a database or Typematic Rate retri o Above 1MB Memory Test Disabidd j etrieval system without prior written permission Memory Test Tick Sound Enabled Memory Parity Error Check Enabled Hard Disk Type 47 RAM Area 0 300 System Boot Up NumLock On Floppy Drive Seek At Boot Disabled System Boot Up Sequence As E External Cache Memory Enabled Internal Cache Memory Enabled TRADEMARKS Pe alt Checking Option Setup y poh OM Sha e CODO fae Enabled ROM ow CBO Disabled ROM h e dow 000 O 32K Disabled OM 5h O 2K Disabled Po Disabled E Disabled Disabled Disabled Disabled Disabled Disabled Intel is a registered trademark of I
4. If you are installing an 486DX or 486SX the internal CPU clock speed is the same as the external CPU clock speed This is different for i486DX2 CPU where the external speed is one half of the internal speed For example a 486DX2 66 has an external clock speed of 33MHz SEIS Pie 2 3 OPEN OPEN SHORT 2 3 OPEN SHOR Care should be taken when installing the CPU into the Pin Grid Array PGA socket on the system board Make certain that pin 1 of the CPU chip is correctly aligned with pin 1 of CPU socket The location of pin 1 on the CPU is denoted by a small notch CPU Chip Pin 1 486SH System Board User s Manual Page 7 ach ize Jumper The system board supports 64KB 128KB 256KB of cache memory Cache S PE RCM DO la ize Jumper Selectio n AS III III VESA L Bu mper Jumper JP4 allows any VL Bus adapter to identify the speed of the system board o tl a o a A DD O O ONO NN SS OOOO 2 3 Default System board runs one wait state write transfer All VL Bus adapters can operate in this mode System board runs zero wait state write transfer Some VL Bus adapters may not be able to run this mode 1 2 Pago 8 486SH System Board User s Manual Clear CMOS Data Jumper The CMOS jumper JP10 is used to clear the system configuration data currently stored in the CMOS RAM All system setup information hard disk type date time etc stor
5. The pin assignments are indicated below ION DO mo O OU E OIR Keyboard Lock Speaker Connector The Speaker connector SPEAKER is a 4 pin keyed BERG strip It is used to connect an external 2 inch 8 ohm speaker to the system board to provide sound capability The pin assignments are defined below Key No Connection speaker 4 Connection a Q N ga 12 486SH System Board User s Manual ji de 2 iy 2 ji R nn r The system RESET connector RESET is a 2 pin BERG strip It is used to connect the push button reset switch located on the front panel to the system board System reset can be done by shorting pin 1 to pin 2 with the same effect as turning the power off and then on again Tur witch nn r The Turbo switch TB SW is a 2 pin BERG strip It is used to connect the front panel 2 position push switch to the system board speed switching circuitry In Turbo speed the cache memory is enabled and full speed of 32 bit memory transfer is utilized In non turbo speed the cache memory is disabled In both speeds the ISA expansion bus timing compatibility is still preserved Turbo Speed Notes System runs at Turbo speed when pins 1 and 2 are shorted System runs at Slow speed when pins 1 and 2 are open Turbo LED nn r The Turbo LED connector marked as TB LED is a 2 pin BERG strip It is used to connect a CPU operating frequency indicator LED
6. gt lt Alt gt lt Backspace gt When the System Password feature is enabled in BIOS Setup the user can invoke this feature at any time by pressing this key sequence This feature is useful for preventing unauthorized access to the system Once system locking is invoked the keyboard does not accept anything from the keyboard until the correct password is entered The Num Lock Caps Lock and Scroll Lock LEDS blink when the system is password locked SYSTEM POWER DOWN MODE Pressing lt Ctrl gt lt Alt gt lt gt key sequence puts the system into immediate power down mode This hot key sequence is active if the Green PC system power saving mode is enabled in BIOS Setup 486SH System Board User s Manual Page 29 PASSWORD STATE APPENDIX A AMI BIOS HARD DISK TYPE The table below lists the Green PC power saving hot key sequence id and the state of Password in various modes SE ee eee een System Condition OP a e AO A Be The password feature is enabled The Keyboard Num Lock Caps a IA IA EU through BIOS Setup and the Lock and Scroll Lock LEDs op Tal ay Cacio EPeskaace gt bin until thee comset password Se me do key sequence is pressed s ptered via keyboard e m s eas a oe The password feature is enabled Same as above foo as A so RE frame through BIOS Setup and the lt Ctrl gt lt Alt gt lt gt hot key O O OA RS sequence is pr
7. need not speculate about the value of the interleave factor while entering the parameters for format This function determines the optimum interleave factor for the best disk performance Media Analysis does a comprehensive analysis of the harddisk surface to find out bad patches on your harddisk This leaves the surface of the harddisk formatted with bad tracks marked bad WRITE TO CMOS AND EXIT After you have made any changes during setup use this option to store those new information into non volatile CMOS memory The system should reboot with the correct system board configuration DO NOT WRITE TO CMOS AND EXIT After you have have not made any changes during setup and decided not to store those information into non volatile CMOS memory use this option to exit Setup The system should reboot with the current configuration stored in CMOS memory S Page 28 486SH System Board User s Manual CHAPTER 5 KEYBOARD HOT KEYS SYSTEM SPEED System speed can also be changed through keyboard There are two available speeds as shown below Turbo speed Cache memory and 32 bit DRAM transfer mode are ON Set by pressing lt gt key once while holding lt Ctrl gt lt Alt gt and lt Shift gt keys Slow speed Cache memory and 32 bit DRAM transfer mode are OFF Set by pressing lt gt key once while holding lt Ctrl gt lt Alt gt and lt Shift gt keys SYSTEM SECURITY LOCKING The default hot key sequence is lt Ctrl
8. page shows the component layout of the 486SH system board with locations of the system board jumpers and connectors Note that most jumpers and connectors on the system board are labeled with proper names with pin 1 marked as 1 To avoid damaging the board and to have proper operation caution should be taken when connecting these components SYSTEM BOARD JUMPERS Jumpers are used to select between various operating modes A jumper switch consists of two three or four gold pins projecting from the system board Placing the plastic jumper cap over two pins connects those pins and makes a particular selection Using the cap to cover two pins in this way is referred to as shorting those pins If the cap is not placed on any pins at all this is referred to as leaving the pins open Note When you open a jumper leave the plastic jumper cap attached to one of the pins so you don t lose it PINS 1 2 OPEN SHORTED SHORTED 2 pin jumper 3 pin jumper 486SH System Board User s Manual Page 5 reen P A Connector eyboard Controller Monitor Type Selection Green Power u Contr CMOS Reset Holes for Plastic Mountings or Selection Cache Size CPU 4865H System CE AN SIMM7 85C461 Keyboard connector an UN NO 00 fad 5 s pa es sE 1S sH v pr OS ev MES 533 23 o 3 eo a 5 2 Board User s Manual AO A COMPONENT LAYOUT External Clock Jumpers
9. the cables from the back of the system in order to give more room to work Note how all cables are connected prior to disconnection Remove the computer s cover Choose an unused VL Bus slot Setting the VL Bus card according to its user s manual Holding the card at the center of the top edge gently push straight down with equal pressure at both ends Replace the screw to hold the card into place Replace and secure the system cover 10 Reconnect all the wires and cables VL BUS SLOT AT SLOT 486SH System Board User s Manual Page 17 EQUIPMENT REQUIRED The dimension of the 486SH system board is designed to fit perfectly in a PC XT or PC AT standard case To build a complete high performance system based on the 486SH system board the following equipment are needed A chassis with dimension similar to PC XT AT standard chassis A standard AT 220W power supply which is capable to provide a continuous power within a 4 85 VDC to 5 25 VDC range A power line filter may be needed for areas with noisy transmission A 2 inch 8 Ohm speaker to provide sound capability A 2 position switch with a 2 pin connector for speed function A push button switch with 2 pin connector for reset function One floppy drive 360K or 1 2M or 1 44M Hard disk drive A combinational hard disk and floppy disk controller card A video card Monochrome CGA EGA VGA A set of flat cables between floppy drive and hard disk dr
10. 5 minutes The I O pins that are associated with each timer are hardware design specific and are defined as connectors JP8 and JP50 on the 486SH motherboard Please refer to Chapter 2 for detailed description of these connectors CPU and devices connected to JP8 and JP50 will go in to power saving mode if the keyboard is not used by user for a period of time programmed through this BIOS option AUTO CONFIGURATION WITH BIOS DEFAULTS Use this option to load the default configuration values directly from ROM If the stored record created by the Setup program becomes corrupted these defaults will load automatically when you turn the computer on AUTO CONFIGURATION WITH POWER ON DEFAULTS Use this option to load the settings detected by the system when you turn it on It your system behaves erratically you can use this feature to check for incorrect settings CHANGE PASSWORD Follow these steps to change system password Note that the pass word cannot be longer than 6 characters 1 Choose CHANGE PASSWORD from the Setup Main Menu and press lt Enter gt 2 If this option has never been used the screen will display the following message Page 26 486SH System Board User s Manual Enter NEW Password If you want to disable the password option just press lt Enter gt key to return to the Main Menu 3 If this option has been used to enter the password the screen will display the following message Enter Current Passw
11. ATE NO NO NO OO CINE APPENDIX A AMI BIOS HARD DISK TYPE APPENDIX B MEMORY MAPPING APPENDIX C AT I O ADDRESS MAP APPENDIX D INTERRUPT ASSIGNMENTS APPENDIX E ENVIRONMENTAL SPECIFICATION 486SH System Board User s Manual Page 3 486SH System Board User s Manual CHAPTER 1 INTRODUCTION The 486SH system board adds to our 486 product line high integration and cost effective solution without compromising performance and quality With top speed at 50MHz and integrated 64K 128K 256K Write Back cache the 486SH dramatically boosts system throughput for even the most demanding applications The 486SH offers features and functionality exceeding any other system board in its class including CPU e Intel i486DX i486DX2 486SX i487SX P24T and Overdrives Cache Memory e Supports 64K 128K 256K cache memory Main Memory e Supports 256Kx9 1Mx9 and 4Mx9 SIMM modules Up to 32 MBytes on board memory Slots e Three 32 bit VESA Local Bus slots e Six 16 bit ISA bus slots e One 8 bit ISA bus slot Green PC L glock slow down and monitor shut down features Battery i n be rd battery as e 486SH System Board User s Manual 4 CHAPTER 2 JUMPERS amp CONNECTORS When working with the 486SH it is extremely important that you avoid static electricity Always ground yourself by wearing a wrist or ankle strap Figures 1 on the next
12. O DODOOODOOOOOOO NO wh oe o 88 6 0 ee oe arate ae ete ee ee ete ee a a ee es sre ee tie bh ee ete ee is sie se a MOA es a ele OOO OOOO OOOO ese a ee ee te eres a ee a se RIR ower cod Ground ese ee a 12 VDC sm F5 VDC 486SH System Board User s Manual External Battery Connector The external battery connector J1 is a 4 pin keyed BERG strip It is used to connect 4 5 Volt external battery in case the on board battery capsule is not installed to provide power to the system board Real Time Clock and CMOS memory when the system power is off For an external battery the battery s cable connector attaches to pin 1 and 4 of J1 as shown below 1 2 External Battery 3 Battery Connection A eu K rd Conn r The keyboard connector is a 5 pin circular type DIN socket It is used to connect the system board keyboard interface to any standard AT compatible keyboard 84 or 101 key type keyboards The pin assignment is shown below es Clock Signal Keyboard Data Signal 5V Fused VDC 486SH System Board User s Manual Page 11 Power LED and Keyboard Lock Connector The Power LED and Keyboard Lock connector KEYLOCK is 5 pin keyed BERG strip It is used to connect 5 VDC power to the power indicator LED at the front panel and connect security keyboard lock to the keyboard controller This allows you to switch off the keyboard and so provide limited security against casual intruders
13. ed in the CMOS will be destroyed This function would be useful if you were to forget the user password for the system 1 2 Default 2 3 Normal CMOS Operation Clear CMOS Data Display Type i Video display is A EGA or OPEN Monochrome Default Video display is CGA SHORT Enable Gree SH control During specified idle period Default CPU clock is slowed down to 8 MHz to conserve power Disable Green PC clock slow down control CPU is always running at full speed 486SH System Board User s Manual Page 9 Nara ido ui in SYSTEM BOARD CONNECTORS Following is the list of 486SH system board connectors required to be installed for proper system operation Power supply connectors CN1 CN2 External battery connector J1 Keyboard connector KB1 Power LED and keyboard lock connector KEYLOCK Speaker connector SPEAKER Reset connector RESET Turbo switch connector TB SW Turbo LED connector TB LED Green PC Connectors JP8 JP50 P nn r The two Power Supply connectors CN1 and CN2 are 6 pin AT standard power connectors Most power supplies have two six wire connectors two of the wires on each connector are black Align the two six wire connectors so that the two black wires on each connector are in the middle as shown below nnector ease e us a o 4 505 5 onnector OCO OTAN Re EN onnector CN2 EEE ER ED RE E EE DO O E DR OOO
14. essed to invoke E eh REE EXE PS O a merate power down mode por the Green PC power savings Same as above Cie 2 ja o es impone feature and the password feature a Rc A A are enabled The system goes to ower down state after the time OS Ee a a A RS p S did OC expires The Green PC power savings Press any key for full power oo A O IN EE reature is enabled through BIOS operation ca 4 cs ss iaa Setup Password is disabled and ee RECO EA EVO E A PENE the lt Ctrl gt lt Alt gt lt gt key rem Ega sequence s pressed ae i sas EE ATA alo 98 7 A RO 6 e 17 93 moe o ar ade PS SS ST 7 toe eee Oe A 7 Ez oa 18 ea ea AA 7 E coa e a A 7 Re Tea dr Se 17 E OI E A A 17 Mec E MD DRC toe 17 41MB Be 5 8 18 085 oo GM 25MB CACIONES REU dE REM SALAO E 40 so e no so 17 eme Mi 7 e e er E S ame 41M Berl ss 5 se st 17 sm da eo 10 65535 830 17 69MB MRE om 15 Ss as 17 114m8 gt SLO a A MOTTA asp AE TE TR Pago 30 486SH System Board User s Manual 486SH System Board User s Manual Page 31 APP ENDIX B MEMORY MAPPING APPENDIX C AT I O ADDRESS MAP 7 00000000 DMA Controller 1 8237A 5 00080000 000A0000 000C0000 OFO OFF CPU s Internal Math Coprocessor 1FO 1F8 Fixed Disk Drive Adapter 200 207 20C 20D 21F 000C8000 000D0000 SAO DELE 64K 1 0 ROM Not Cached Reser
15. from the front panel to the system board The pin assignments are indicated below LED Cathode LED Anode 486SH System Board User s Manual Page 13 CHAPTER 3 INSTALLATION reen P r This function requires AMI Megakey keyboard controller To program the Green PC feature use BIOS Power Management Setup THE DRAM SIMMs The on board DRAM memory subsystem has eight module mounting parma sockets which are divided into banks of four sockets each These ite banks are labeled Bank O and Bank 1 Single In Line Memory Module e this pin for controlling SIMM added to these banks must be installed a full bank at a time general purpose Green PC device When signal Start with bank O then work your way up DRAM speed must be on this pin goes low the external Green PC 80ns 7Ons or 60ns You can configure the memory of the 486SH device connected to this pin should go into in a variety of ways The chart below shows the possible power saving state This pin must be f combinations programmed through BIOS Power Management Setup ts Keyboard P12 Connect this pin to the Video card s Feature Connector also called VGA Pass Through connector Sync Enable pin 18 During power saving mode if enabled through system BIOS signal on this pin goes low to turn OFF the Vertical Horizontal Sync going to the display monitor to conserve power This pin must be programmed through BIOS Power Management Setup Keyboard P13 Use thi
16. g BIOS code to fast 32 bit RAM area and executes it from there The default setting is Enabled Adapter ROM Shadow Default setting is Disabled If you have other expansion cards with ROMs on them such as SCSI controller you will need to know which addresses the ROMs use Boot Sector Virus Protection Select Enabled to protect the Boot sector of your hard disk from software virus such as Michael Angelo EEE O EN RR 486SH System Board User s Manual Page 23 IDE Block Mode Transfer Some latest IDE hard disks support multiple sector Block Mode transfer for faster performance Users select Enabled to take advantage of this feature If your system hard disk supports Block Mode BIOS message Block Mode Enabled will appear during boot up IDE Standby Mode Default is Disabled If this feature is enabled IDE hard disk will go into Standby Mode to save power in 15 minutes of no access Auto Key Lock Time out Default is Disabled Keyboard will lock up to prevent unauthorized access after an idle period from 1 to 15 minutes This feature is enabled by setting up system Password and selecting number of minutes Cyrix Suspend Feature Default is Disabled 486 compatible CPUs from Cyrix support Suspend Feature that allows a dramatic reduction in CPU power consumption DRAM Speed DRAM Write CAS Pulse DRAM Write Cycle Select these options according to table below 20MHz or Fastest 25MHz 33MHz 40MHz 50MHz
17. ge 19 AMI BIOS SETUP PROGRAM BIOS SETUP UTILITIES STANDARD CMOS SETUP Use the standard CMOS Setup screen to check or modify general a id configuration information such as the date time floppy type hard ADVANCED CMOS SETUP disk type video type etc PORRADA A e Date Month Date Year On the bottom right corner of the AUTO CONFIGURATION WITH BIOS DEFAULTS screen a calendar has been provided for user You manually set GURATION WITH POWER ON DEFAULTS the electronic calendar only if the values are incorrect AUTO CONFI r CHANGE PASSWORD e Time Hour Minute Second The time here is 24 hour time You would enter 5 30 P M as 17 30 00 AUTO DETECT HARD DISK HARD DISK UTILITY e Hard Disk C D Type The BIOS provides 46 predefined types of popular hard disk drives Relevant specifications include the PRETO EMOS AND EXI number of cylinders and heads write pre compensation time DO NOT WRITE TO CMOS AND EXIT read write head landing zone number of sectors per track A hard disk will not work properly if your enter incorrect drive parameters Standard CMOS Setup for Changing Time Date Hard Disk Type etc If your particular drive is not one of the 46 pre defined types ESC Exit JoTe Sel F2 F3 Color F10 Save amp Exit simply scroll down to select type 47 and enter the appropriate values for cylinders heads WPcom LZone and sectors Size is 4 Choose an option and press lt Enter gt Modify the system automa
18. gt Modify the Setup Item section Page 20 486SH System Board User s Manual 486SH System Board User s Manual Page 21 lt ADVANCED CMOS SETUP ADVANCED CMOS SETUP lists some system features that allows you to fine tune your system setup Page 22 486SH System Board User s Manual Typematic Rate Programming Choose Enabled or Disabled Enable this option to adjust the keystroke repeat rate Adjust the rate via Typematic Rate Delay and Typematic Rate Typematic Rate Delay Choose the delay between holding down a key and when the character begins repeating Default is 500milliseconds Typematic Rate Choose the rate a character keeps repeating Default is 15 characters per second Above 1MB Memory Test Default is Disabled to speed up power on initialization process and the BIOS will only test the extended memory every 32K locations only to determine the on board memory size Memory Test Tick Sound Default is Enabled for the ticking sound during memory test Memory Parity Error Check Default is Enabled to test for transmission errors in data read from memory Hard Disk Type 47 RAM Area The BIOS uses this area to store extended information such as user definable drive type 47 There are two options Default option is 0 300 in lower system RAM DOS 1KB in the top 1KB of the 640KB DOS base memory System Boot Up NumLock When the computer boots it selects the numeric values rather than the curs
19. ive to the combinational controller card An AT compatible keyboard 84 or 101 Keyboard with cable A video display monitor Following additional equipment will be useful to enhance the system A bus or serial mouse A tape pack up drive CO eee Page 18 486SH System Board User s Manual CHAPTER 4 BIOS SETUP You need to setup a system once every time e You start a new and unconfigured system e You receive a start up error message indicating the configuration information stored in the non volatile CMOS RAM has somehow become corrupted e You add remove or change peripherals from your system The first time you power up the system the configuration information stored in the battery backed CMOS RAM may not be correct The BIOS detects this condition and prompts user to go through the SETUP section This chapter explains how to use the BIOS SETUP program and make the appropriate entries Some of the parameters are already factory preset and do not need to be changed Please read the instructions carefully and only change the settings if necessary ENTERING SETUP 1 Reset the system by turning it OFF then ON or pushing the RESET button on the system front panel 2 Hit the lt Del gt key momentarily as soon as the following message appears Hit lt DEL gt if you want to run SETUP 3 After you press the lt Del gt key the following BIOS Setup screen appears 486SH System Board User s Manual Pa
20. ntel Corporation IBM is a registered trademark of International Business Machines Corporation Microsoft is a registered trademark of Microsoft Corporation VESA is a registered trademark of Video Electronics Standard Association Maleta teta LODAAGOGOGOOUT DISCOS OSSOS RI All other trademarks used in this manual are the property of their respective owners rs RECTAS ISLE Enabled 486SH System Board User s Manual Page 1 Bd eins OL n ES a 7 A E ma a A A SR id m TABLE OF CONTENTS CHAPTER 1 INTRODUCTION CHAPTER 2 JUMPERS amp CONNECTORS SYSTEM BOARD JUMPERS CPU External Clock Jumpers CPU Type Jumpers Cache Size Jumpers VESA Local Bus Jumpers rabo Clear CMOS Data Jumper CC Display Type Jumper Green PC Jumper SYSTEM BOARD CONNECTORS Power Supply Connectors External Battery Connector Keyboard Connector Power LED and Keyboard Lock Connector Speaker Connector Reset Connector Turbo Switch Connector Turbo LED Connector Green PC Connectors CHAPTER 3 INSTALLATION THE DRAM SIMMs Installing DRAM SIMMs INSTALLING A VL BUS CARD EQUIPMENT REQUIRED CHAPTER 4 BIOS SETUP ENTERING SETUP STANDARD CMOS SETUP ADVANCED CMOS SETUP POWER MANAGEMENT SETUP AUTO CONFIGURATION BIOS DEFAULTS AUTO CONFIGURATION POWER ON DEFAULTS CHANGE PASSWORD AUTO DETECT HARD DISK _ HARD DISK UTILITY ay ES ea TO CMOS AND EXIT Te TO CMOS AND EXIT BOARD HOT KEYS PEED i SE C pY LOCKING OW R DOWN MODE y yr
21. or control functions on the numeric keypad of IBM compatible keyboards Most extended compatible keyboards have separate cursor control keys It is therefore unnecessary to use the numeric keypad for this The default setting is On Floppy Drive Seek At Boot Default is Disabled On this setting the system will check the hard disk first to find the disk operating system This option also allows the user to run the system without a floppy disk drive System Boot Up Sequence f A C default the BIOS will look for bootable operating system files from floppy drive A first before looking for them in drive C You can reverse this sequence by selecting C A External Cache Memory Select Enabled to enable external on board cache memory Internal Cache Memory Select Enabled to enable the cache memory inside the 486 CPU chip Password Checking Option Choose Setup or Always default setting is Setup The password feature can be used to prevent unauthorized system boot up or unauthorized use of BIOS SETUP Always Each time the system is turned on the pass word prompt appears Setup If there is a password set the Password prompt only appears if you attempt to enter the BIOS Setup program If there is no set password the Password Checking Option is disabled You create a password by using CHANGE PASSWORD in the Main Menu Video ROM Shadow C000 32K Shadowing helps to speed up BIOS access by copyin
22. ord Enter the current password default is AMI and follow the screen instructions to change the password 4 After you correctly enter the current password the following message appears prompting you for the new password Enter NEW Password 5 Enter the new password and the following message appears Re Enter NEW Password 6 Re enter the new password If the password is mis keyed the following error message appears ERROR Press Any Key If the password is keyed in correctly the following confirmation message appears NEW Password Installed 7 Press lt Esc gt to exit to the Main Menu AUTO DETECT HARD DISK Use this BIOS utility to automatically detect popular IDE hard disk type if it is not readily available It is not guaranteed than this utility will work with all IDE hard disk There is no need to use this utility if you already have hard disk type information 486SH System Board User s Manual Page 27 HARD DISK UTILITY Use this option to do low level hard disk format Auto Interleave and Media Analysis of your MFM harddisk drive IDE ESDI and SCSI drives don t need this utility and you should not use it on them Low level harddisk format should be done for new harddisks and should be done yearly for used harddisks This format function allows you to format the entire disk or a part of the disk Warning All data on the harddisk may be lost after a low level format With Auto Interleave you
23. s pin for controlling general purpose Green PC device When signal on this pin goes low the external Green device connected to this pin should go into power saving state This pin must be programmed through BIOS Power Management Setup Keyboard P15 Use this pin for controlling general purpose Green PC device When signal on this pin goes low the external Green device Four 256KB SIMMs 1MB connected to this pin should go into power Four 1MB SIMMs 4MB saving state This pin must be programmed i through BIOS Power Management Setup E Four 4MB SIMMs 16MB 486SH System Board User s Manual Page 15 Pago 14 486SH System Board User s Manual Installing DRAM SIMMs 1 The SIMM modules should face to the left towards ISA bus slots 2 Insert the SIMM at a 45 degree angle tilted away from the ISA slots 3 Gently push the SIMM to an upright position until it snaps into place 4 Repeat above steps Page 16 When working with DRAM SIMMs it is extremely important that you avoid static electricity Always ground yourself by wearing a wrist or ankle strap until the entire bank is filled 486SH System Board User s Manual INSTALLING A VL BUS CARD Carefully follow these steps to install a VL Bus card 1 2 8 9 Turn off your computer and unplug the power cord Turn off the power to all peripheral devices such as your printer Disconnect
24. tically determined by the other entries You can also let parameters to reflect the options installed in the system the BIOS to determine the drive type by selecting AUTO DETECT HARD DISK from the Main Menu 5 Press lt Esc gt at anytime to return to the Main Menu e Floppy Drive A Type 360KB 720KB 1 2MB 1 44MB 2 88MB 6 In the Main Menu choose WRITE TO CMOS AND EXIT to save or Not Installed Specify the type of the first floppy drive your changes and reboot the system Choosing DO NOT WRITE installed on the system Not Installed could be used as an TO CMOS AND EXIT ignores your changes and exits the BIOS option for diskless workstations SETUP program i i e Floppy Drive B Type Specify the type of the second floppy In each setup screen the following common keyboard controls may drive installed on the system d e Primary Display Monitor Color 40x25 Color 80x25 lt F1 gt Help _ VGA PGA EGA Monochrome The Not Installed option could lt F2 gt lt F3 gt Color to change screen color be used for network file servers lt F5 gt Old Setup Values lt F6 gt BIOS Setup Default Values 2 e Keyboard Installed Not Installed Default is Installed Not lt F7 gt Power On Default Values Installed allows your system to operate without keyboard lt ESC gt Exit Setup Section Arrow Keys Select Setup Item After all selections have been done press lt Esc gt key to exit this lt PG UP PG DN
25. ved Reserved 000E0000 a ooorrrrr BIOS ROM aren Nos FEA 00C00000 System Memory Not cached if memory OOFFFFFF RAM mapped I O board is ptr eo come salar Sener ee C1 FFFFFF RAM 30 383 Cuser AS FFFDFFFF Bisynchronous 1 Monochrome Display and Printer Adapter Enhanced Graphics Adapter Color Graphics Monitor Adapter Diskette Drive Controller 3BO 3BF 3CO 3CF 3DO 3DF 3FO 3F FFFEOOOO 128K On Board FFFFFFFF BIOS ROM Mgt carnau Page 32 486SH System Board User s Manual 4865H System Board User s Manual Page Page 34 486SH System Board User s Manual APPENDIX D INTERRUPT ASSIGNMENTS BH System Board User s Manual mas PeraleliPor2 o AA 106 Diskette Controller mos Expansion Bus Pin IRQ10 Expansion Bus Pin L trois Expansion Bus Pin Rao Interval Timer 1 Counter O Out C Ronm Expansion Bus Pin Parity AT Channel Check y AE pi APPENDIX E ENVIRONMENTAL SPECIFICATION TEMPERATURE RANGE Operating 50 to 104 Fahrenheit 10 to 40 Celsius Non Operating 50 to 104 Fahrenheit 10 to 40 Celsius Shipping 22 to 140 Fahrenheit 30 to 60 Celsius RELATIVE HUMIDITY NON CONDENSING Operating 20 to 80 Non Operating 5 to 90
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