SOYO 80486 Green Mainboard User Guide

A486VESA Green Mainboard
User’s Guide &
Tachnical Reference

80486 Green Mainboard

About This Guide
This User’s Guide is for assisting system manufacturers and end users in setting up and installing the mainboard. Information in this guide has been carefully checked for reliability; however, no guarantee is given as to the correctness of the contents.
The information in this document is subject to change without notice.

Copyright Notice
Copyright 1993, Soyo Technology Co. Ltd. Al rights reserved. This manual is copyrighted by Soyo Technology Co., Ltd. You may not reproduce, transmit, transcribe, store in a retrieval system, or translate into any language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual, or otherwise, any part of this publication without express written permission of Soyo Technology Co., Lid.
Trademarks
Soyo is a registered trademark of Soyo Technology Co., Ltd. Al trademarks are the property of their owners.
Disclaimer
Soyo Technology Co., Ltd. makes no representations or warranties regarding the contents of this manual. We reserve the right to revise the manual or make changes in the specifications of the product described within it at any time without notice and without obligation to notify any person of such revision or change. The information contained in this manual is provided for general use by our customers. Our customers should be aware that the personal computer field is the subject of many patents. Our customers should ensure that they take appropriate action so that their use of our products does not infringe upon any patents. it is the policy of Soyo Technology Co., Ltd. to respect the valid patent rights of third parties and not to infringe upon or assist others to infringe upon such rights
Restricted rights legend
Use, duplication, or disclosure by the Goverment is subject to restrictions set forth in subparagraph (c)(1)ii) of the Rights in Technical Data and Computer Software clause at 252.277-7013.

Edition: February 1994
Version 2.0 100% POST-CONSUMER RECYCLED PAPER
25H SERIAL
100% POST-CONSUMER RECYCLED PAPER

Electrostatic Discharge Precautions
Make sure you ground yourself before handling the mainboard or other system components. Electrostatic discharge can easily damage the components. Note that you must take special precaution when handling the mainboard in dry or air-conditioned environments.
Abide by the precautions below to protect your equipment from electrostatic discharge:

• Do not remove the anti-static packaging until you are ready to install the mainboard and other system components.
• Ground yourself before removing any system component from its protective anti-static packaging. You can ground yourself by grasping the expansion slot covers or other unpainted portions of the computer chassis.
• Frequently ground yourself while working, or use a grounding strap.
• Handle the mainboard by the edges and avoid touching its components.

Introduction

The 486 VESA mainboard is a high-performance system board that supports 486DX2/DX/SX/SL Enhanced 486, P24T, and Cyrix M6/M7 CPUs. The mainboard is fully compatible with industry standards, while incorporating many technical enhancements.
The 486 VESA mainboard offers superior system performance, compatibility, and reliability, and is the ideal choice for a wide variety of system applications.

Key Features

• Fully AT compatible. Supports 486DX2/DX/SX/SL Enhanced 486, P24T, and Cyrix M6/M7 CPUs

• Supports internal cache (CPU) write-back (P24T, M6/M7) systems

• Supports Power Management Mode
  Supports the SMM and the SMI
  CPU Stop. Clock Function
  Four Power Saving States (normal/standby/suspend/off)
  Supports the APM control
  – Supports Berg Switch control
  – Power Saving also on non-SMI CPU
  – More System Event Monitoring and the Power Saving Control

• Direct map cache controller that supports 64K, 128K, or 256K cache size

• Fast page burst mode DRAM controller

• Memory configurations from  of 80ns 256K, 512K, 1M, 2M, 4M and 16M SIMM modules

• BIOS/Video ROM Cacheable

Unpacking the Mainboard
The mainboard package contains:

• The 486 VESA Mainboard
• This User’s Guide

Note: Do not unpack the mainboard until you are ready to install it.
Follow the precautions below while unpacking the mainboard.

1. Before handling the mainboard, ground yourself by grasping an unpainted portion of the system’s metal chassis.
2. Remove the mainboard from its anti-static packaging and place it on a grounded surface, component side up.
3. Check the mainboard for damage. If any chip appears loose, press carefully to seat it firmly in its socket.

Do not apply power if the mainboard appears damaged. If there is damage to the board contact your dealer immediately.

Mainboard Layout

Hardware Setup

This chapter explains how to configure the mainboard’s hardware. Alter you install the mainboard, you can set jumpers install memory and a coprocessor on the mainboard and make case connections. Refer to this chapter whenever you upgrade or reconfigure your system.
CAUTION: Turn off power to the mainboard, system chassis, and peripheral devices before performing any work on the mainboard or system.

Setting Jumpers
You can configure hardware options on the mainboard by setting jumper switches. Jumper switches are rows of small pins on the mainboard that are set by using a jumper cap. Refer to Figure 1-1 for jumper locations.

• Close a jumper switch by inserting the plastic jumper cap over two pins of the jumper.
• Open a jumper switch by removing the jumper cap.
  Note: When you open a jumper, attach the plastic jumper cap to one of the pins so you won’t lose it.

For jumper settings, the symbol: denotes a jumper cap.
For example, three-pin jumper settings are designated as below.
Pins 1 and 2 are Closed with a jumper cap.
Pins 2 and 3 are Closed with a jumper cap.

Hardware Setup
JP3: Display Type Settings
JP3 configures the mainboard for use with a color or monochrome monitor.

JP5: CMOS Reset Jumper
Jumper JP5 lets you discharge CMOS memory in the event you forget your password or encounter a BIOS Setup problem. Before you install the mainboard make sure that JPS is set to retain CMOS memory.

P28: Green PC Power Control
This jumper controls Green PC Power, where the output status is low active.
Note: The Green PC Power must accept a low input signal and the POWER MANAGEMENT function must be Enabled (see page 25).
JP34: Berg Switch
Toggle this jumper to force the system to enter the 8 MHz (Standby) mode.
Press any key or move the mouse to wake the system to full speed mode.
J4: Green Control Pin
The mainboard supports 4 sets of BIOS controlled jumpers. You can set the timer to control an extental device. Output status is low active.
CPU Type Configuration
Configure the 486 VESA mainboard’s CPU by inserting the specified CPU and setting jumpers as described in the diagrams that follow. Note that the CPU Type jumpers on the mainboard have yellow caps and the Clock Setting jumpers have red caps.

Intel / AMD CPUs *486DX-25/33/40/50 and 486DX2-50/66 Settings Note: For the CPUs marked with an asterisk, a cooling fan is suggested for system stability
P24T Settings**

Note: For the CPUs marked with an asterisk, a cooling fan is suggested for system stability

Cyrix CPUs
*Cyrix 486S (M6) Settings Note:** For the CPUs marked with an asterisk, a cooling fan is suggested for system stability

Cyrix 486DX (M7, or M6+C6) Settings

*Note: For the CPUs marked with an asterisk, a cooling fan is suggested for system stability.

Cache Configuration
The 486 VESA mainboard has a write-back caching scheme. You can configure the mainboard’s external cache for 64KB, 128KB, or 256KB by setting jumper switches and installing cache chips. Refer to the following pages for jumper switch settings and cache socket locations.
Cache Jumper Settings
You must set jumpers JP24, J25, and J26 to configure cache size. See the illustrations below.
Note that the cache jumpers on the mainboard have white jumper caps.
Cache Size and RAM Locations
The table below describes the chip type and socket locations for each cache size configuration.

64K Cache (White Caps) Settings

X = setting doesn’t matter
128K Cache (White Caps) Settings

256K Cache (White Caps) Settings

Memory Configuration
The 486 VESA mainboard lets you increase the system’s main memory via on board SIMM (Single In-line Memory Modules) sockets. The mainboard supports two banks of 256K, 1M, 4M and 16M SIMM.. The mainboard requires SIMM of at least 80ns access time.
On-board memory is located in two banks: Bank 0 and Bank 1. See Figure 1-1.
Four SIMM sockets are provided in each bank. You can install either a 256K, 1M, 4M or a 16M SIMM in each socket with any configuration.
The mainboard supports the following configurations:

Table 2-1. On-board Memory Configurations

Connectors
Attach the 486 VESA mainboard to case devices, or an external battery, via connectors on the mainboard. Refer to Figure 1-1 for connector locations and connector pin positions
J17 – Keylock & Power LED Connector
J17 is a connector for a lock that may be installed on the system case for enabling or disabling the keyboard. J17 also attaches to the case’s Power LED

J18 – Speaker Connector
Attach the system speaker to connector j18.
J19 – Hardware Reset Control
Attach the Reset switch to J19. Closing the Reset switch restarts the system.
J20 – External Battery Connector
J20 is a 4-pin connector to which you can attach an external battery. Pin 1 of
J20 is positive (+ ) and pin 4 is negative (-).
J21 – Turbo Switch Connector
J21 is connected to a Turbo switch on the front of the system case. The connector’s pins 1-2 are shorted for normal operation and pins 2-3 are shorted for turbo operation.
J22 – Turbo LED Connector
J22 connects to a Turbo LED on the case control panel and works with the Turbo Switch. If the mainboard is in Turbo mode, the Turbo LED lights

CN1- Keyboard Connector
A five-pin female DIN keyboard connector is located at the rear of the board.
Plug the keyboard jack into this connector.
CN2 – Power Supply Connectors
The mainboard requires a power supply with at least 200 watts and a “power good” signal. CN2 has two six-pin male header connectors.
Plug the dual connectors from the power directly onto the board connector while making sure the black leads are in the center.

BIOS Setup

The mainboard’s BIOS setup program is the AMI BIOS from American Megatrends Inc. Enter the AMI Setup program’s Main Menu as follows:

1. Turn on or reboot the system. After a serics of diagnostic checks, the  following message appears:
   “Hit if you want to run SETUP”

2. Press the key to enter the AMI BIOS setup program and the following screen appears:

3. Choose an option and press <Enter›. Modity the system parameters to reflect the options installed in the system. (See the following sections.) A warning message appears. each time one of the first three options is selected, before any changes are allowed to the parameters.

4. Press at anytime to return to the Main Menu

5. In the Main Menu, choose “WRITE TO CMOS AND EXIT” to save your changes and reboot the system. Choosing “DO NOT WRITE TO CMOS AND EXIT” ignores your changes and exits the program.

Main Menu Options
The Main Menu options of the AMI BIOS are described below.

Standard CMOS Setup
Run the Standard CMOS Setup as follows.

1. Choose “STANDARD CMOS SETUP” from the Main Menu and a screen with a list of items appears.
2. Use the arrow keys to move between items and select values. Modify fields using the PUp/PgDn keys. Some fields let you enter values directly.
   Date (mn/date/year)| Type the current date.
   ---|---
   Time (hour:min:sec)| Type the current time
   Hard disk C & D| Choose from the standard hard disk types 1 to 46.
   Type 47 is user definable. If a hard disk is not
   installed choose “Not installed.” (default)
   Floppy drive A & B| Choose 360KB, 5 1/4*
   1.2MB, 5 1/4″ (default)
   720KB, 3 1/2″
   1.4M, 3 1/2″
   2.88 MB, 3 1/2″
   Not installed
   Primary display| Choose Monochrome, (default)
   Color 40×25,
   VGA/EGA/PGA,
   Color 80×25, or
   Not installed
   Keyboard| Choose Installed (default) or Not installed
3. After you have finished with the Standard CMOS Setup program, press the ‹ESC> key to return to the Main Menu.

Advanced CMOS Setup
Run the Advanced CMOS Setup as follows.

1. Choose “ADVANCED CMOS SETUP” from the Main Menu and a screen appears. (The screen below shows the BIOS default settings.)
2. Use the arrow keys to move between items and to select values. Modify the selected fields using the PgUp/PgDn keys. <*> keys are explained below: < F1> ：| “Help” gives options available for each item ---|--- < F2/F3> ：| Change color < F5> ：| Get the old values. These values are the values with which you started the current session. If the CMOS was good, then the old values are either the CMOS values or the BIOS Setup default values. < F6> ：| Load al options with the BIOS Setup default values. < F7> ：| Load all options with the Power-On default values.

A short description of the screen items follows:

Delay and Typematic Rate
Typematic Rate Delay| Choose the delay between holding down a key and when the character begins repeating.
Typematic Rate| Choose the rate a character keeps repeating.
Above 1 MB Memory Test| Choose Enabled or Disabled. Enable this option to invoke the POST memory routines on the RAM above 1MB. Disable and BIOS only checks the first IMB of RAM
Memory Test Tic Sound| Choose Enabled or Disabled. Enable this option to turn on Sound the “ticking” sound during the memory test. Disable to turn off this sound.
Hit Message Display| Choose Enabled or Disabled. Disable this option to prevent “Hit if you want to run SETUP” message from appearing when system boots-up.
Hard Disk Type 47 RAM Area| The choice “0:300” is recommended for most cases.
However, if the system is involved with Novell Netware, choose “DOS 1KB” to avoid conflicts with DOS. (Novell uses 0:300 for operation system programming.
Wait for F1 if any Error| Choose Enabled or Disabled. Enable this option to display “Press to continue” when a POST non-fatal error occurs. Disable to eliminate the need for user response to a non-fatal error message
System Boot Up Num Lock| Choose On or Of. On puts numeric keypad in Num Lock mode at boot-up. Off puts numeric keypad in arrow key mode at boot-up.
System Boot Up Sequence| The AMI BIOS first attempts to boot from drive A: and then, if unsuccessful, from hard disk C:. You can reverse this sequence with this option.
External Cache Memory| Choose Enabled or Disabled. This option lets you enable or disable the external on-board cache memory
Internal Cache Memory| Choose Enabled or Disabled. Use this option to enable or disable the 486 CPU’s internal cache.
Fast Gate A20 Option| Choose Enabled or Disabled. Enable this option to allow RAM accesses above 1MB using the fast gate A20 line.
Turbo Switch Function| Choose Enabled or Disabled. This option lets you enable or disable the turbo switch function.
Password Checking Option| Choose Setup, or Always. Use this feature to prevent unauthorized system boot-up or unauthorized use of BIOS Setup.
“Always” – Each time the system is booted the password prompt appears.
“Setup” – If a password is set, the password prompt only appears if you attempt to enter the Setup program. If a password is not set, this choice disables the Password Checking Option.
Video or Adaptor ROM Shadow| ROM shadow copies BIOS code from slower ROM to faster RAM. BIOS can then execute from RAM. These 32K segments can be shadowed from ROM to RAM. BIOS is shadowed in a 32K segment if it is enabled and it has BlOs present.
IDE Block Mode Transfer| Some advanced hard disks support block mode transfer, which enhances hard disk performance. The default setting is Enabled. This function is not supported by some older model hard disks
AUTO Config Function| The default setting is Enabled. This option automatically configures the menu items that follow it to their optimal settings. Note that optimal settings are not necessarily shown on the screen — so do not adjust any settings when this
function is enabled.
It is recommended that you enable this option. If this
option is Enabled, you must boot from Turbo mode.
3. After you have finished with the Advance CMOS Setup, press the key to return to the Main Menu.

Power Management Setup

1. Choose “POWER MANAGEMENT SETUP” from the Main Menu and a screen with a list of items appears.
2. Use the arrow keys to move between items and to select values. Modify the selected fields using the PUp/PgDn keys.
   A short description of screen items follows:BIOS Power Management| Choose Enabled or Disabled. This item lets you enable or Mode disable the mainboard’s Green (power saving) function.
   ---|---
   APM Interface| Choose Enabled or Disabled (default). APM stands for Advanced Power Management. To use APM you must run “power.exe” under DOSV6.0 or later version.
   Doze Timer| The default setting is No — you can adjust the time from 10 sec. to 15 min. depending on your
   requirements.
   Sus pend Timer| The default setting is 6 minutes. Only an SL-Enhanced (or SMI) CPU can enter this mode. Time is adjustable from 10 seconds to 2 hours. Doze mode time plus Suspend time is
   the actual elapsed time before Suspend mode
   HDD Auto Standby Timer| When the set time has elapsed, the BIOS sends a command to the HDD to enter standby (sleep) mode, which turns off the motor. Time is adjustable from 1 to 15 minutes. The default setting is Disabled. Some older model HDDs may not support this advanced function.
   Be DozeState Act Monitor| This item controls when the system enters Doze mode. If an item is Enabled, its activity  prevents the system from entering Doze mode.
   Be SpoState Act Monitor| This item controls when the system enters Suspend mode.
   If an item is Enabled, its activity prevents the system from entering Suspend mode. Only an SL-Enhanced (or SMI) . CPU supports this function.
   System Wake Up Event| This item controls system wake up. If an item is Enabled, its activity wakes up the system.
   Display Off Timer| When Suspend mode occurs, the monitor screen shuts of. If keys on the keyboard are pressed or if the mouse is moved, the screen comes back on. Only an SL-Enhanced (or SMI) CPU supports this function.

Auto Configuration with BIOS Defaults
This Main Menu item loads the default system values. If the CMOS is corrupted the defaults load automatically. Choose this item and this message appears:
“Load BIOS Setup Default Values from ROM Table (Y/N)? N™
To use the BIOS defaults, change the prompt to “Y” and press < Enter>. The following message appears:
“Default values loaded. Press any key to continue.”
Auto Configuration with Power-On Defaults
This Main Menu item uses the default Power-On values. Use this option as a diagnostic aid if your system behaves erratically. Choose this item and the following message appears:
“Load Power-On Default Values (Y/N)? N”
To use the Power-On defaults, change the prompt to “Y” and press «Enter».
The following message appears:
“Default values loaded. Press any key to continue.”

Change Password This Main Menu item lets you configure the system so that a password is required every time the system boots or an attempt is made to enter the Setup program. The password cannot be longer than 6 characters. Note that there is no default password stored in the ROM. Change the password as follows:

1. Choose “Change Password” in the Main Menu and press . The following message appears: “Enter NEW Password:” (if there’s no password) or “Enter CURRENT Password:” (if a password is already set)

2. The screen will not show the characters entered.

3. After you correctly enter the current password, the following message appears prompting you for the new password:
   “Enter NEW Password:”

4. Enter the new password and the following appears:
   “Re-Enter NEW Password:”

5. Re-enter the new Password. If the password is miskeyed, the following enor message appears:
   “ERROR, Press Any Key…”
   If the password is keyed in correctly the following confirmation message appears:
   “NEW Password Installed”

6. Press < E S to exit to the Main Menu.

When you next boot the system, after saving the changed values to CMOS, you will be prompted for the password.
If you are not prompted for the password, check that the “Password Checking Option” in the Advanced CMOS Setup is configured for “Always” or “Setup.”
See the section above on “Advanced CMOS Setup.”
When the prompt appears, type the new password and press ‹Enter>.
Important: Keep a safe record of the new password. If you forget or lose the password, the only way to access the system is to set jumper JP5 to clear the CMOS RAM. All setup information is lost and you must run the BIOS setup program again.
Auto Detect Hard Disk
This Main Menu item automatically detects the hard disk type and configures the STANDARD SETUP accordingly.
Note: This function is only valid for IDE hard disks.

NOTE

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