IBM Mother Board 486F39X User manual

Copyright Notice
0 Copyright 1994.
The information contained in this user’s manual and all accompa-
nying documentation is copyrighted and all rights reserved. This
publication may not, in whole or in part, be reproduced, tran-
scribed, stored in a retrieval system, translated into any language
or computer language, or transmitted in any form whatsoever
without the prior written consent from the manufacturer, except
for copies retained by the purchasers for their personal archival
purposes.
The manufacturer reserves the right to revise thisuser’s manual
and all accompanying documentation and to make changes in the
content without obligation to notify any person or organization of
the revision or change.
IN NO EVENT WILL THE VENDOR BE LIABLE FOR DIRECT,
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THIS PRODUCT OR DOCUMENTATION, EVEN IF ADVISED
OF THE POSSIBILITY OF SUCH DAMAGES. IN PARTICULAR,
THE VENDOR SHALL NOT HAVE LIABILITY FOR ANY
HARDWARE, SOFTWARE, OR DATA STORED OR USED WITH
THE PRODUCT, INCLUDING THE COSTS OF REPAIRING,
REPLACING, OR RECOVERING SUCH HARDWARE,
SOFTWARE, OR DATA.
IBM is a registered trademark of International Business Machines
Intel is a registered trademark of Intel Corporation
80486 is a registered trademark of Intel Corporation
VESA VL-Bus is a registered trademark of Video Electronics Standard
Association

n Table Of Contents
Chapter 1
Introduction
486F39X Mainboard Features
Power Supply for
486F39X Mainboard
Chapter 2
Hardware Guide
Before You Begin
486F39X Mainboard Layout
Connectors
Cache Memory
System Memory
CPU Type and Speed Selection
System Speed Change
Chapter 3
Software Guide
Software Setup
Running Award BIOS
Standard CMOS Setup
BIOS Features Setup
Chipset Features Setup
Power Management Setup
Load BIOS Defaults
Load Setup Defaults
Password Setting
IDE HDD Auto Detection
Save and Exit Setup
Exit Without Saving
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486F39X User’s Manual
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Warranty Information
Your 486F39X mainboard comes with a limited one-year
warranty. The manufacturer warrants this product against
defects in material and workmanship for one (1) year from date
of purchase. Defective parts will be exchanged or repaired at
the manufacturer’s option, for one (1) year after date of original
purchase.
Service can be obtained by calling the manufacturer for a
Return Merchandise Authorization (RMA) number. A receipt or
copy of invoice with date of purchase is also required before
any warranty service will be rendered. Write the RMA number
legibly on the outside of the shipping carton and mail prepaid
or hand carry to the manufacturer. Shipping and handling
charges
will be applied for all orders that have to be mailed
whenservice is complete.
This warranty covers normal consumer use and does not cover
damages incurred in shipping or failure due to abuse, misuse,
or misapplication, nor as a result of service or modification
other than by the manufacturer.
486F39X User’s Manual
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Chapter 1: Introduction
1 Introduction
486F39X Mainboard Features
The 486F39X is a high performance, function enchanced
computer mainboard that combines the power of 80486
DX/
DX2/DX4 CPU and the VESA VL-bus. The features integrated
onto the 486F39X mainboard are as follows:
l Supports the following 3-VOLT or 5-VOLT CPUs:
1. Intel 486DX4-100 (486F39X-X4 only)
2. AMD 3-VOLT CPUs (486F39X-X4 only)
3. Pentium’” Over Drive Processor
(P24T)
4. 486 SX/DX/DX2, 487SX, 486 Over Drive Processor
Optional 128KB/256KB/512KB external cache.
72-pin DRAM SIMM modules in multiple configurations up
to 64 MB.
Power Saving functions for“SL” and non-“SL”
CPUs with a
flexible power management setup.
Compatible with EPA “Energy-Star” specifications and power
management utilities such as Microsoft APM.
3 32-bit VL-Bus slots and 5
16-bit ISA slots.
System and Video BIOS relocateable to RAM area to enhance
performance.
Fast A20 and hidden DRAM refresh to boost system
performance.
Break switch connector for a manual suspend button.
2 on-board connectors to control “green” devices such as a
“green” power supply.

Chapter 1: Introduction
Power Supply for 486F39X Mainboard
A clean steady power source is necessary to get reliable perfor-
mance from the system. With the high clock speeds of the CPU
(running at
25MHz or above) the quality of the power supply
becomes even more important. Most
power supplies in the market
meet the standards required bythe CPU, however some have been
found to be out of specification. To be certain of the highest
performance by your system, be sure your powersupply
provides a voltage range of 5.25 volts maximum to 4.95 volts
minimum.
In areas with noisy power transmission, we suggest the use of
a linenoise filter between the power and the computer.
486F39X User’s Manual 3

Chapter 2: Hardware Guide
2 Hardware Guide
Before You Begin
Before removing the mainboard from its anti-static bag, you
need to eliminate any static electricity that may be accumulated
on your body. The charge that can build
up in your body may
be more than enough to damage integrated circuits on the
system board. Therefore, it is important to observe basic
precautions whenever you handle or use computer components.
Although areas with humid climate are much less prone to
static build-up, it is best to always safeguard against accidental
damage that may lead to costly repairs. The following measures
should be sufficient to protect your equipment from static
discharge:
l After removing the system cover, discharge any static
electricity that might have accumulated in your body by
touching a grounded or anti-static surface (e.g. anti-static
pads). If nothing is available, touch the power supply
housing. This assumes the system unit is plugged in and
grounding the case. Be certain to do this before removing
components from their anti-static coverings.
l When handling separate cards, boards or modules, be
cautious to avoid contacting with the components on them,
and also with the “gold edge” connectors that plug into
the expansion bus. It is best to handle them either by their
edges or by mounting brackets that attach to the slot
opening in the system cases. However, the above
recommendations are just intended to avoid the static
discharge problems.
l Make certain that everything that connects to the system
case, including the power supply, is
unplugged before
doing the installation work.
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