486-OCV Plus System Board User’s Manual - D21840429 -
v Copyright 1994, by DFI Inc. All rights reserved. No part of this document may be copied or reproduced in any form or by any means without the prior written consent of DFI, Inc. DFI, Inc. makes no warranties with respect to this documentation and disclaims any implied warranties of merchantability, quality, or fitness for any particular purpose. The information in this document is subject to change without notice. DFI, Inc.
v Table of Contents v Introduction ................................................................................. 1-1 Features and Specifications ................................................. 1-2 2-1 2-1 2-2 2-2 2-2 2-2 2-6 2-7 2-8 2-8 Installation Overview ................................................................. Preparing the Area ................................................................ Handling the System Board ..................................................
Change Password ......................................................... Auto Detect Hard Disk .................................................. Hard Disk Utility ............................................................. Write to CMOS and Exit ................................................ Do not write to CMOS and Exit .................................... 3-8 3-9 3-10 3-11 3-11 Troubleshooting Checklist ...................................................... 4-1 Appendix A: Types of Modules .......
486-OCV Plus v Introduction The 486-OCV Plus system board is designed so that it may be equipped with Intel's 80486DX, 80486DX2, 80486SX, and 80486 OverDriveTM Processors which can run from speeds of 25MHz to 66MHz. It may also use a PentiumTM OverDrive Processor running at 50MHz or 66MHz. This Pentium-based system board is twice as fast as the 80486DX-33 and accommodates almost all of the existing programs designed for 386 or 486-based systems.
PentiumTM OverDrive Ready System Board The 486-OCV Plus uses 256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36 and 8Mx36 HSIM modules with speeds of at least 80ns. The memory can be configured to twenty-one different sizes from 1MB to 64MB. The system is equipped with two 32-bit VESA VL-Bus and eight 16-bit ISA expansion slots.
486-OCV Plus • Supports VESA VL-Bus devices (2 VESA Master/ Slave) ISA DMA Master access to local device Local Master access to an ISA device Fully compatible with VESA VL-Bus rev. 1.0 • Two 32-bit VL-Bus and eight 16-bit ISA slots • Maximum card length Full-length cards in all VL-Bus slots and in three ISA slots 9.
PentiumTM OverDrive Ready System Board v Installation Overview This chapter summarizes the steps in installing the 486-OCV Plus system board into your system unit. It also includes a description of the area in which you must work and directions for memory installation. Before installing the system board, obtain the memory you plan to install. Preparing the Area Before unpacking the system board, make sure the location you have selected is relatively free of dust and static.
486-OCV Plus Handling the System Board It is quite easy to inadvertently damage your system board even before installing it to your system unit. Static electrical discharge can damage computer components without causing any signs of physical damage. You must take extra care in handling the system board to ensure that no static build-up is present. Tips in Handling the System Board 1) To prevent electrostatic build-up, leave the board in its anti-static bag until you are ready to install it.
PentiumTM OverDrive Ready System Board An HSIMM consists of several RAM chips soldered onto a small circuit board. An HSIMM connects to the system board via a 72-pin card-edge connector. The HSIMM sockets are divided into four banks on the system board. The 486-OCV Plus system board uses 256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36 and 8Mx36 HSIM modules. Note: The 8Mx36 HSIM module must be the standard size module. Mechanical problem may occur if a longer size of module is installed.
486-OCV Plus Memory Size Bank 0 Bank 1 Bank 2 Bank 3 1MB 2MB 2MB 4MB 5MB 6MB 6MB 8MB 8MB 9MB 9MB 12MB 12MB 13MB 13MB 16MB 16MB 16MB 18MB 18MB 20MB 20MB 24MB 24MB 24MB 24MB 28MB 28MB 28MB 28MB 28MB 28MB 32MB 32MB 256Kx36 256Kx36 512Kx36 1Mx36 256Kx36 256Kx36 512Kx36 1Mx36 2Mx36 1Mx36 2Mx36 1Mx36 2Mx36 256Kx36 256Kx36 1Mx36 2Mx36 4Mx36 256Kx36 512Kx36 1Mx36 4Mx36 1Mx36 2Mx36 1Mx36 4Mx36 1Mx36 2Mx36 1Mx36 1Mx36 4Mx36 4Mx36 4Mx36 8Mx36 256Kx36 1Mx36 256Kx36 1Mx36 1Mx36 1Mx36 1Mx36 1Mx36 1Mx36 256Kx36 4M
PentiumTM OverDrive Ready System Board Memory Size Bank 0 Bank 1 Bank 2 Bank 3 34MB 34MB 36MB 36MB 36MB 36MB 40MB 40MB 40MB 40MB 40MB 40MB 48MB 48MB 52MB 52MB 52MB 52MB 52MB 52MB 64MB 64MB 256Kx36 512Kx36 1Mx36 4Mx36 4Mx36 8Mx36 1Mx36 2Mx36 1Mx36 4Mx36 4Mx36 8Mx36 4Mx36 8Mx36 1Mx36 1Mx36 4Mx36 4Mx36 4Mx36 8Mx36 4Mx36 8Mx36 256Kx36 4Mx36 1Mx36 4Mx36 1Mx36 4Mx36 1Mx36 4Mx36 4Mx36 4Mx36 4Mx36 1Mx36 1Mx36 4Mx36 4Mx36 - 4Mx36 8Mx36 4Mx36 4Mx36 1Mx36 1Mx36 4Mx36 8Mx36 4Mx36 4Mx36 1Mx36 2Mx36 4Mx36 4Mx36
486-OCV Plus OPTi 82C499 Pin 1 of the HSIMM socket Bank 0 Bank 1 Bank 2 Bank 3 Locations of the HSIMM Sockets on the System Board Installing the Modules HSIMMs simply snap into a socket on the system board. Pin 1 of the HSIMM must correspond with Pin 1 of the socket.
PentiumTM OverDrive Ready System Board 1. Position the HSIM module above the HSIMM socket with the chips of the module facing the center of the system board. 2. Seat the module at an angle into the bank. Make sure it is completely seated. Tilt the module upright until it locks in place in the socket. Board Configuration The 486-OCV Plus is designed with jumpers and connectors onboard. Make sure that the jumpers are set correctly before installing the system board into your system unit.
486-OCV Plus Jumper Settings Jumper Settings for VL-Bus Add-On Board If a VL-Bus add-on board is installed in the 486-OCV Plus system board, make sure Jumpers JP18, JP23, JP24 and JP34 are set correctly.
PentiumTM OverDrive Ready System Board Jumper JP23 High Speed Mode for VL-Bus Board Set Jumper JP23 to Off only if the VESA VL-Bus add-on board installed in the VL-Bus slots support Zero Wait State. If you are not sure that your add-on board(s) support Zero Wait State, set JP23 to On; otherwise, a system error may occur.
486-OCV Plus Jumper JP18 VL-Bus Ready Signal Select If a VESA VL-Bus add-on board is installed in either one of the VL-Bus slots and the 486-OCV Plus system board is using a 486-50DX CPU, we recommend that you set Jumper JP18 to "Delay 1 PCLK". Your system board might not work properly if Jumper JP18 is set to "No Delay".
PentiumTM OverDrive Ready System Board * If Jumper JP34 is set to Delay 1 PCLK, the 486-OCV Plus will only support one VL-Bus Master in Slot SL2. Jumper Settings of Internal/External/CMOS Clean, Display Type and Diagnostic/Password Clear Jumper J11 enables or disables the internal battery, external battery or CMOS Clean. JP29 allows you to select between a color or monochrome display. JP39 allows you to perform diagnostic test and clear the password.
486-OCV Plus Jumper J11 Internal Battery/CMOS Clean Select The 486-OCV Plus comes with an internal battery. If there is a problem with the internal battery, or if you prefer to connect an external battery, set Jumper J11 pins 1-2-3 to Off and connect an external battery to Connector J10. 1 2 3 1-2-3 Off: External Battery Enable (Default) If, for some reason, the CMOS becomes corrupted, the system can be reconfigured with the default values stored in the ROM chips.
PentiumTM OverDrive Ready System Board Jumper JP29 Display Type Select Jumper JP29 sets the display adapter to color or mono. This jumper must match the type of display adapter installed. If you change your video adapter, make sure that this jumper is changed accordingly. On: Color Display (Default) Off: Mono Display Jumper JP39 Diagnostic/Password Clear If you had enabled the Password Checking Option in the Advanced CMOS Setup and forgot your password, set Jumper JP39 to On.
486-OCV Plus Cache Configuration The 486-OCV Plus system board can be configured to three different cache sizes: 64KB, 128KB and 256KB. 128KB of cache memory is the default size. Either 8K x 8 (20ns) or 32K x 8 (20ns) chips are used for cache depending on the size of cache desired. Regardless of the amount of cache memory installed, one 8K x 8 (20ns), one 16K x 8 or one 32K x 8 (20ns) SRAM is needed for tag RAM to store the cacheable addresses.
PentiumTM OverDrive Ready System Board U3 U14 U15 U16 U17 U19 U20 U21 U22 Locations of the SRAM Sockets on the 486-OCV Plus System Board Cache Size U14/U15/U16/U17 U19/U20/U21/U22 U3 64KB 128KB* 256KB 8K x 8 32K x 8 32K x 8 8K x 8 None 32K x 8 8K x 8 8K x 8 16K x 8 or 32K x 8 * Default setting 2-15 u Installation Overview
486-OCV Plus Jumper Settings for Cache Memory JP6 JP9 JP7 JP8 OPTi 82C499 Locations of Jumpers JP6-JP9 on the 486-OCV Plus System Board Installation Overview u 2-16
PentiumTM OverDrive Ready System Board Cache Memory Size Jumpers 64KB 128KB* 256KB JP6 JP7 JP8 JP9 Off Off 2-3 On 2-3 On On Off 1-2 On 1-2 On On On 2-3 On 2-3 On * Default setting On Off 1 1 2 2 3 3 2-3 On 1-2 On 2-17 u Installation Overview
486-OCV Plus CPU Installation and Upgrade The 486-OCV Plus is equipped with a Zero Insertion Force (ZIF) socket to make upgrading flexible and easy. Make sure the jumpers are set correctly before applying power, or you may damage the CPU or system board. CPU Configuration Location U8 of the 486-OCV Plus system board is a 237-pin ZIF socket for the Intel 486TM family of CPUs, 486 OverDriveTM Processors, and the PentiumTM OverDrive Processor. This makes upgrading easy and affordable.
PentiumTM OverDrive Ready System Board Jumper Settings for CPUs JP38 JP12 JP14 JP25 OPTi 82C499 JP13 Locations of Jumpers JP12-JP14, JP25 and JP38 on the 486-OCV Plus System Board Jumpers JP12-JP14 and JP25 Clock Selection These jumpers should be set to match the speed of the CPU installed on the 486-OCV Plus system board.
486-OCV Plus 486SX/DX-25, 486DX2-50, PentiumTM OverDrive Processor 50MHz 486SX/DX-33, 486DX2-66, PentiumTM OverDrive Processor 66MHz 486SX/DX-40 486DX-50 JP12 JP13 JP14 JP25 Off Off On 2-3 On On Off On 2-3 On On Off On Off Off On 1-2 On 1-2 On On 3 2 Off 1 2-3 On 3 2 1 1-2 On Jumper JP38 CPU Type Selection Jumper JP38 should be set to match the type of CPU installed on the 486-OCV Plus system board.
PentiumTM OverDrive Ready System Board The jumpers below are for factory testing only and should always be set to their default configurations. Reconfiguring these jumpers will cause problems with your 486-OCV Plus system board.
486-OCV Plus Installing Upgrade CPUs The 486-OCV Plus is equipped with a 237-pin Zero Insertion Force (ZIF) socket at location U8 of the system board. The 486-OCV Plus accommodates all of the Intel 486TM and 5V PentiumTM family of OverDrive processors, and Cyrix or AMD 486DX-40 CPU. The ZIF socket allows easy CPU upgrades and minimizes the chance of breaking off CPU pins. Warning: Open the socket only if actually installing an upgrade CPU.
PentiumTM OverDrive Ready System Board Install the 80486SX, 80486DX, 80486DX2 or the 80486 OverDriveTM Processor, which only has three rows of pins, in the three inner rows of the socket. The outermost row of pin holes should be visible on all four sides of the socket when any of these CPUs is installed. The PentiumTM OverDrive Processor has four rows of pins on each side and should be installed so it covers all the pin holes of the ZIF socket. To install, simply move the handle upward.
486-OCV Plus CPU Pin 1 Positioning the CPU Above the ZIF Socket Gently push the handle down until the handle locks into place. You will hear a click when the handle is secure. When you want to remove the chip, simply lift the handle and remove the chip. Warning: The cables (floppy drive, hard drive, CD-ROM, etc.) must be routed clear of the CPU with a minimum of 0.25" horizontal clearance to allow heat dissipation. A minimum of 1.
PentiumTM OverDrive Ready System Board Cable Adequate airflow for cooling must be provided over the CPU. For PentiumTM OverDrive Processors, the airflow must be adequate to keep the system temperature below 40oC, measured 0.5 inch above the CPU and assuming a room temperature of 25oC.
486-OCV Plus Installing the System Board Before installing the system board into your system unit, you should prepare the tools you will use: You will need: • one medium size, flat-bladed screwdriver • one medium Philips screwdriver Step 1 Unlock your system unit. Turn off the power and disconnect all power cords and cables. Step 2 Remove the system unit cover. Refer to the manufacturer's instructions if necessary.
PentiumTM OverDrive Ready System Board Step 5 Insert the SIM modules into the SIMM banks on the 486-OCV Plus. The quantity and location of the SIM modules is dependent upon the memory configuration and type of modules you intend to use. Step 6 Set the corresponding jumpers. Step 7 Install the prepared 486-OCV Plus system board into the case and replace the screws. Step 8 Reinstall all cards and connectors and replace the system unit cover. Reconnect all power cords and cables.
486-OCV Plus v Initial Setup Program After you power up your system, the BIOS message appears on your screen and the memory count begins. After the memory test, the message below will appear on the screen if your CMOS Setup is correct: Enter CURRENT Password: The default password is AMI. You have three chances to type the correct password. If the password is still incorrect after the third try, the system will lock up. You must turn your system off and back on to restart it.
PentiumTM OverDrive Ready System Board AMI BIOS Setup Utilities If you want to change your CMOS setup, press when the message, "Hit if you want to run setup", appears on the screen. Again, if you enabled the password option, you will be prompted to the message below: Enter CURRENT Password: The default password is AMI. For information on how to change the password, refer to the "Change Password" section on page 3-8. After entering the correct password, the screen below appears.
486-OCV Plus This message warns you that inappropriate modifications may cause problems. Press to continue or to abort. If the system fails after the setup procedure, power off the computer and turn it on again. Wait for the message, "Hit if you want to run setup", and press .
PentiumTM OverDrive Ready System Board The upper right hand corner shows the base memory size and extended memory size of your system. You cannot alter these items; your computer automatically detects and displays them. The left side of the screen lists the modifiable parameters. You can change the date, time, hard disk drive (C and D), type of floppy drive (A and B), primary display, and keyboard options.
486-OCV Plus If none of the pre-set types is appropriate for your hard drive, choose 47, which is the user-definable type. To use this type, highlight either hard disk C or D, depending on your hard drive configuration. Use the key until type 47 is showing. Fill in all the parameters as specified by the drive manufacturer. To move between parameters, hit the key. When you are through making changes, press to return to the main menu.
PentiumTM OverDrive Ready System Board Set the password checking option to "Always" or "Setup" if you want to enable this option. Setting it to "always" will prompt you for a password every time you cold boot your system or access setup. When you set the option to "Setup", you will be prompted for a password only when trying to access setup. The Boot Sector Virus Protection option may be set to "enabled" or "disabled".
486-OCV Plus Auto Configuration with BIOS Defaults If, for some reason, the CMOS becomes corrupted, the system can be reconfigured with the default values stored in the ROM chips. The BIOS Setup default values should provide optimum performance for the system. You should use these values unless you are possibly having hardware problems. Highlight this option on the main menu and press . The message below will appear.
PentiumTM OverDrive Ready System Board Change Password The default password is AMI. If you want to change the password, make sure you set the Password Checking Option to "Always" or "Setup" under Advanced CMOS Setup. If not, the error message below will appear on the screen: must be enabled in Advanced CMOS Setup Press any key to continue Use the arrow keys to highlight the Change Password Option and press . The message below will appear.
486-OCV Plus Press any key on the keyboard to return to the message below: Enter NEW Password: Type in a password that is six characters long or shorter. When done, you will be asked to verify the new password: Re-enter NEW Password: Type in exactly the same password. Failure to do so will yield the error message shown below: Error, press any key If you receive this error, you will have to start all over.
PentiumTM OverDrive Ready System Board The screen displays the parameters detected and allows you to accept or reject the parameters. Type "Y" and press to accept the parameters or press to abort. If you select "Y", the parameters for hard disk Type 47 will be displayed in Standard CMOS Setup. If you select "N", the parameters in the Standard CMOS Setup will remain the same. Hard Disk Utility This option will format, set the interleave mode, and do a media analysis of your hard drives.
486-OCV Plus Use the arrow keys to select the desired options, and press to exit when done. Write to CMOS and Exit When all the changes have been made, highlight "Write to CMOS and Exit" and press . The message below will appear: Write to CMOS and Exit (Y/N)? N Type "Y" and press . The modifications you have made will be written into the CMOS memory, and the system will reboot. You will once again see the initial diagnostics on the screen.
PentiumTM OverDrive Ready System Board v Troubleshooting Checklist If you experience difficulty with the 486-OCV Plus system board, please refer to the checklist below. If you still cannot isolate the problem, please contact your dealer. 1) Check the jumper settings to ensure that the jumpers are properly set. If in doubt, refer to the “Board Configuration” section. 2) Verify that all SIM modules are seated securely into the bank sockets. 3) Make sure that the SIM modules are in the correct locations.
486-OCV Plus v Appendix A: Types of Modules The 486-OCV Plus system board allows you to populate memory with 256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36 and 8Mx36 SIM modules. The following modules have been tested with this board. Most untested brands will work but a few may fail to do so.
PentiumTM OverDrive Ready System Board For SIM 2Mx36 Modules Brand Chip Number Fujitsu OKI 814400-80 M511000B-70J A-2 u Appendix A
486-OCV Plus v Appendix B: System Error Report During the POST (Power On Self Test) routines, which are performed each time the system is powered on, errors may occur. Errors can be fatal or non-fatal. Fatal Errors Fatal errors are those which will not allow a system to continue the boot-up procedure. If a fatal error occurs, you should consult your system manufacturer for repair.
PentiumTM OverDrive Ready System Board Non-Fatal Errors Non-fatal errors are those which, in most cases, allow the system to continue the boot-up process. The error messages normally appear on the screen. Error Message 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. CH-2 Timer Error INTR #1 Error INTR #2 Error CMOS Battery State Low CMOS Checksum Failure CMOS Options Not Set CMOS Display Type Mismatch Display Switch Not Proper Keyboard is Locked...
486-OCV Plus v Appendix C: Memory & I/O Maps Memory Address Map Address Name Function 0000000 to 009FFFF 640K System Board RAM System Board Memory 00A0000 to 00BFFFF 128K Video Display Memory Reserved for Graphics Display Memory 00C0000 to 00EFFFF 192K I/O Expansion ROM Reserved for ROM on I/O Adapter Card 00F0000 to 00FFFFF 64K ROM on the System Board System Board BIOS 0100000 to 3FFFFFF Maximum Memory 63M System Board Memory Appendix C u C-1
PentiumTM OverDrive Ready System Board I/O Address Map I/O Address 000-01F 020-03F 040-05F 060-06F 070-07F 080-09F 0A0-08F 0C0-0DF 0E8 0F0 0F1 0F8-OFF 1F0-1F8 200-207 278-27F 2F8-2FF 300-31F 360-36F 378-37F 380-38F 3A0-3AF 3B0-3BF 3C0-3CF 3D0-3DF 3F0-3F7 3F8-3FF Function DMA Controller 1, 8237A-5 Interrupt Controller 1, 8259A, Master Timer, 8254-2 8742 (Keyboard Controller) Real-time Clock, NMI (Non-maskable Interrupt) Mask DMA Page Memory, 74LS612 Interrupt Controller 2, 8259A DMA Controller 2, 8237A-5 S
486-OCV Plus v Appendix D: 16-Bit ISA I/O Pin Assignments B Gnd Reset Drv +5V DC IRQ9 -5V DC DRQ2 -12V DC OWS +12V DC Gnd -SEMEMW -SEMEMR -IOW -IOR -Dack3 -DRQ3 -Dack1 DRQ1 -Refresh CLK IRQ7 IRQ6 IRQ5 IRQ4 IRQ3 -Dack2 T/C Bale +5V DC OSC Gnd A - 01 - 02 - 03 - 04 - 05 - 06 - 07 - 08 - 09 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - -I/O Chck SD7 SD6 SD5 SD4 SD3 SD2 SD1 SD0 -I/O Chrdy AEN SA19 SA18 SA17 SA16 SA15 SA14 SA13 SA12 SA11 SA10 S
PentiumTM OverDrive Ready System Board v Appendix E: VL-Bus I/O Pin Assignments B DAT00 DAT02 DAT04 DAT06 DAT08 GND DAT10 DAT12 Vcc DAT14 DAT16 DAT18 DAT20 GND DAT22 DAT24 DAT26 DAT28 DAT30 Vcc ADR31 GND ADR29 ADR27 ADR25 ADR23 ADR21 ADR19 GND ADR17 ADR15 Vcc ADR13 ADR11 ADR09 ADR07 ADR05 GND ADR03 ADR02 n/c RESET# D/C# M/IO# W/R# - 01 - 02 - 03 - 04 - 05 - 06 - 07 - 08 - 09 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 -
486-OCV Plus Pin Name No. LBC1 LBC2 LBM3 LBT ADR<31..2> ADS# BE<3..0> BLAST# BRDY# D/C# DAT<31..0> ID<4..
PentiumTM OverDrive Ready System Board v Appendix F: System Overview 82C206 Integrated Peripherals Controller The 486-OCV Plus uses an 82C206 integrated peripherals controller that supports the following: DMA Channels DMA Controller 1 DMA Controller 2 Ch0-Reserved for User Ch1-SDLC Ch2-Diskette (IBM Personal Computer) Ch3-Reserved for User Ch4-Cascade for CTRL 1 Ch5-Reserved for User Ch6-Reserved for User Ch7-Reserved for User Note: DMA controller 1 supports 8-bit data transfer DMA controller 2 suppor
486-OCV Plus Page Memory Address I/O Port Address Page Memory 0081H 0082H 0083H 0087H 0089H 008AH 008BH DMA Channel 2 DMA Channel 3 DMA Channel 1 DMA Channel 0 DMA Channel 6 DMA Channel 7 DMA Channel 5 System Interrupts NMI Parity or I/O Channel Check Note: The non-maskable interrupt (NMI) of the 486-OCV Plus is used to report memory parity errors. The memory parity is derived from the system board memory and I/O adapter optional memory.
PentiumTM OverDrive Ready System Board Note: Any or all interrupts including NMI may be masked. The 15 levels of system interrupts from high to low are ordered as: IRQ0>IRQ1>IRQ8>IRQ9>IRQ10>IRQ11 >IRQ12>IRQ13>IRQ14>IRQ15>IRQ3>IRQ4>IRQ5> IRQ6>IRQ7.
486-OCV Plus RAM Module The DRAM memory on the 486-OCV Plus system board can be expanded to a total of 64MB using 256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36 and 8Mx36 HSIMMs. The DRAM controller uses a page mode design with an access time of 80ns or less. Cache Module The 486-OCV Plus supports 64KB/128KB of direct map cache using 8Kx8 (20ns) SRAMs or 256KB using 32Kx8 (20ns) SRAMs. Burst Cycles The 486 microprocessor accepts burst cycles for any bus request that requires more than one data cycle.
PentiumTM OverDrive Ready System Board v Appendix G: Connector Pin Assignments Jumper J1 Diagnostic LCD Port Pin Function 1 2 3 4 5 6 7 8 9 10 Vcc XD0 XD1 XD2 XD3 XD4 XD5 XD6 XD7 Gnd Connector J2 Keyboard Connector Pin Function 1 2 3 4 5 Keyboard Clock Keyboard Data NC Ground 5V G-1 u Appendix G
486-OCV Plus Jumper J3 Speaker Connector Pin Function 1 2 3 4 Speaker NC Ground VCC Pin Function 1 2 3 4 5 LED Power Key Ground Keyboard Inhibitor Ground Jumper J4 Keylock Connector Appendix G u G-2
PentiumTM OverDrive Ready System Board Jumper J5 Turbo LED Connector Pin Function 1 2 -LED Power Jumpers J6/J8 Reset Switch Connectors Pin Function 1 2 Ground Reset Switch Pin Function 1 2 Switch GND Jumper J7 Turbo Switch Connector G-3 u Appendix G
486-OCV Plus Jumper J9 PS/2 Mouse Connector Pin Function 1 2 3 4 5 6 Mouse Data N. C. Gnd +5V Mouse Clock N. C. Jumper J10 External Battery Connector Pin Function 1 2 3 4 Battery +3.
PentiumTM OverDrive Ready System Board Power Connector PL1 and PL2 Connectors Pin Function PL1 1 2 3 4 5 6 Power Good +5V +12V -12V Ground Ground PL2 1 2 3 4 5 6 Ground Ground -5V +5V +5V +5V G-5 u Appendix G
486-OCV Plus v Appendix H: AMI BIOS Hard Disk Table Type Cyln 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 17 18 19 20 21 22 23 24 25 26 27 28 29 306 615 615 940 940 615 462 733 900 820 855 855 306 733 612 977 977 1024 733 733 733 306 925 925 754 754 699 823 Head WPcom LZone 4 4 6 8 6 4 8 5 15 3 5 7 8 7 4 5 7 7 5 7 5 4 7 9 7 11 7 10 128 300 300 512 512 65535 256 65535 65535 65535 65535 65535 128 65535 0 300 65535 512 300 300 300 0 0 65535 754 65535 256 65535 305 615 615 940 940 615 511 733 981 828 855 855 319 7
PentiumTM OverDrive Ready System Board Type Cyln 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 918 1024 1024 1024 612 1024 1024 615 987 987 820 977 981 830 830 917 1224 H-2 u Appendix H Head WPcom LZone 7 11 15 5 2 9 8 8 3 7 6 5 5 7 10 15 15 918 918 65535 1024 65535 1024 1024 1024 128 612 65535 1024 512 1024 128 615 987 987 987 987 820 820 977 977 981 981 512 830 65535 830 65535 918 65535 1223 User defined Sect Size 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 53MB 94MB 128MB 43MB 10MB
486-OCV Plus System Board User’s Manual - 21840429 -
