The Retro Web 486DX VL BUS Main Board

INTRODUCTION

SYSTEM BOARD Feature

• CPU
  • 80486DX(PGA)
  • P23(PGA)
  • P23N(PGA)
  • M6(Cyrix, PGA)
• Co-processor: Cx87(PQFP) for M6 only
• Cache memory: 32KB/64KB/128KB/256KB Selectable
• Main Memory
  • 32MB max on board
  • Using 256K, 1M, 4M SIMM
  • Support 1/2/4/5/8/16/17/20/32
  • MB memory
• I/O SLOT: 6 16-bit and 1 8-bit ISA Slots, 3 VL-BUS Slots
• BIOS: AMI, Award, or other

System Board Layout

CONFIGURATION

Jumper setting and connector

• J1: Keyboard Connector
• J2:External Battery Connector
• 13: Power Connector
• J4:Hardware Reset
• J5: Turbo LED
• J6: Turbo Switch
• J7: Power LED and Key Lock
• J8: Speaker
• JP15: Cx87 Selectable
  • 2-3 Present
  • 1-2 Absent
• JP 11,JP12: CPU Configuration
• JP 16,JP17: VESA BUS Jumper
  • 1-2: Default Setting
  • 2-3: Delay it for 50MHz
• JP13: VESA BUS Jumper
  • OPEN: CPU Clock <= 33MHz
  • CLOSE: CPU Clock > 33MHz
• JP1: Power Good select
  • 1-2: External Power Good
  • 2-3: Internal Power Good
• JP3.4,5: CPU Clock select
• JP19: Monitor Select
  • OPEN: Color
  • CLOSE: Mono
• JP20: Password Clear
  • OPEN: Normal
  • CLOSE: Password Clear

DRAM Installation

• The memory is capable of supporting a minimum of 1 Megabyte of memory up to a total of 32 megabytes of memory. The 256KB /1MB / 4MB SIMM memory is available.
• Each bank consists of 4 sockets for SIMMs and the 80ns or faster (Access time) Page mode DRAM is required. There are two banks of memory (BankO and Bank1), but you don’t care which one is BankO because the BIOS will automatically test which one is BankO.
• Before you even consider altering the memory configuration on your main board, please read this section below:

Cache memory Installation

• This mainboard supports Cache SRAM configurations: 32KB,64KB,128KB, and 256 KB.
• Before you even consider altering the CACHE memory configuration on your main board, please read this section below:

AMI BIOS SETUP

• BIOS SETUP
  • When the system is first powered on or reset, the BIOS will display a copyright message on the first line of the screen, then the BIOS will perform the diagnostics and initialization. When all of the above tests have been passed, the message
  • “Press [DEL] key to run SETUP utility” is displayed. If the [DEL] key is pressed, the screen will be cleared and then the following message will be shown:

Standard CMOS Setup

The setup program is completely menu-driven:

1. Use arrow keys to select entries: Data, Time, Hard Disk(C/D), Floppy, Display, and keyboard.
2. Use the PgUp/PgDn key to modify the option of each entry.
3. Use Esc to exit this screen.

Advanced CMOS Setup

If you don’t understand the meanings of each item, please don’t change the default values. The default setting may be different from those shown below:

Note: “IDE Standby Mode (Min)” can be loaded with values from 1 minute to 255 minutes to set up the Hard disk entering power down mode.

Advance Chipset Setup

• The advanced chipset setup is entirely chipset-specific portion and requires full knowledge of the detail definition of the UMC chipset. Each option is tightly corresponding with the hardware structure.
• Without our engineering change notice, we strongly recommend”don’t change any contents in the advanced chipset setup menu”.

Power Management Setup

• The programmable timers for sequencing of power to the system, but the AMI “MEGAKEY” (U2) and TTL 74LS74 (U33) must be installed.
• The timers can be loaded with values from 1 minute to 255 minutes. This mode can be extended to external devices.

The Standby Mode power savings options are:

• Down CPU Clock to 8 MHz
• Remove the sync signals from the video monitor (this option requires an intelligent monitor that supports standby Mode)
• Please don’t down the CPU clock when the system processing any information, such as formatting the diskette

Wake up the system:

• If the system PASSWORD had not been set up, pressing any key or moving the Mouse to Wake up the system.
• If the system PASSWORD had been set up, move the mouse to Wake up the system but the keyboard can not input data until type the PASSWORD first. [Type PASSWORD also Wake up the system when the Mouse is not being used. ]
• If the system PASSWORD has been set up and when the system is entering power down mode, the LEDs on the Key-board will “blink” until you type the PASSWORD.

Power Management Jumper Setting

NOTE: FOR AMI BIOS ONLY

• JP20: Display card power management
  • Pin 1: V-sync
  • Pin 2: H-sync
  • Pin 3: sync enable
  • Pin 4: general purpose I/O
• JP21: IRQ 3,5 power management select
  • 1-2 short: IRQ 3
  • 2-3 short: IRQ 5
• JP22: IRQ 4,7 power management select
  • 1-2 short: IRQ 4
  • 2-3 short: IRQ 7

Standard type of hard disk

AWARD BIOS STEPS

• When the system is first powered on or reset, the BIOS will display a copyright message on the first line of the screen, then the BIOS will perform the diagnostics and initialization. When all of the above tests have been passed, the message
• “Press DEL to enter SETUP, ESC to skip memory test” is displayed. If the [DEL] key or [ctrI-alt-esc] is pressed, the screen will be cleared and then the following message will be shown:
• ROM ISA BIOS (XXXXXXXX)
• CMOS SETUP UTILITY
• AWARD SOFTWARE. INC.

Standard CMOS Setup

The setup program is completely menu-driven:

1. Use arrow keys to select entries: Data, Time, Hard Disk(C/D), Floppy, and Display.
2. Use the PgUp/PgDn key to modify the option of each entry.
3. Use Esc to exit this screen.

BIOS Feature Setup

If you don’t understand the meanings of each item, please don’t change the default values. The default setting may be different from those shown below:

Chipset Features Setup

• The Chipset Features Setup is entirely chipset-specific portion and requires full knowledge of the detailed definition of UMC chipset. Each option is tightly corresponding with the hardware structure.
• Without our engineering change notice, we strongly recommend”don’t change any contents in the advanced chipset setup menu”.
  • ROM ISA BIOS XXXXXXXX)
  • CHIPSET FEATURES SETUP
  • AWARD SOFTWARE, INC.

Power Management Setup

• The Standby Mode power savings options are:
• HDD Standby Timer:
  • The Hard disk enters power-down mode.
• Display Power Down:
  • The display screen will be closed.
• System Slow Down:
  • • Down CPU Clock to 8 MHz
    • ROM ISA BIOS (XXXXXXXX)
    • POWER MANAGEMENT SETUP
    • AWARD SOFTWARE, INC.
• POWER MANAGEMENT Timer Selection:
  • Disabled: All functions disabled
• Min Power saving:
  • HDD Standby Timer: 15 Min
  • Display Power Down: 15 Min
  • System Power Down: 55 Sec
• Max Power saving:
  • HDD Standby Timer: 1 Min
  • Display Power Down: 1 Min
  • System Power Down: 10 Sec
• User Defined:
• HDD Standby Timer: Disabled-15 Min
• Display Power Down: Disabled-15 Min
• System Power Down: Disabled-55 Sec

Wake up the system:
Pressing any key or moving Mouse to Wake up the system.

Standard type of hard disk

Documents / Resources

The Retro Web 486DX VL BUS Main Board [pdf] User Manual mb-453, 675871c44d255497397627, 486DX VL BUS Main Board, 486DX, VL BUS Main Board, BUS Main Board, Main Board, Board

References

• User Manual