Gigabyte GA-486AS User Manual

GA - 486AS

USER'S MANUAL

¡iCPU VOLTAGE SELECTION¡j

VOLTAGE JP29

3.3V Open
5V Short

PCI-Bus 486SX / DX / DX2 / S-Series / OverDrive / P24D / P24T / DX4 Mainboard

Rev. 1 First Edition

May 3, 1995

GA-486AS
______________________________________________________________________

The author assumes no responsibility for any errors or omissions which may appear in
this document nor does it make a commitment to update the information contained
herein.

IBM PC/AT, PC/XT are trademarks of International Business Machine Corporation.
AWARD is a trademark of AWARD Software, Inc.
Intel is a trademark of Intel Corporation, Inc.
AMD is a trademark of Advanced Micro Devices, Inc.
Cyrix is a trademark of Cyrix Corporation.
UMC is a trademark of United Microelectronics Corporation.
MS-DOS, WINDOWS NT are registered trademarks of Microsoft Corporation.
OS/2 is a trademark of Internal Business Machines Corporation.
UNIX is a trademark of Bell Laboratories.

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2

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Table of Contents

Table of Contents

1.INTRODUCTION......................................................................................................1-1

1.1. PREFACE.......................................................................................................1-1

1.2. KEY FEATURES ............................................................................................1-1

1.3. PERFORMANCE LIST ...................................................................................1-2

1.4. BLOCK DIAGRAM..........................................................................................1-3

1.5. INTRODUCE THE PCI-BUS..........................................................................1-3

2.SPECIFICATION......................................................................................................2-1

2.1. HARDWARE ...................................................................................................2-1

2.2. SOFTWARE ...................................................................................................2-2

2.3. ENVIRONMENT.............................................................................................2-2

3.HARDWARE INSTALLATION .................................................................................3-1

3.1. UNPACKING...................................................................................................3-1

3.2. MAINBOARD LAYOUT ..................................................................................3-2

3.3. JUMPERS AND CONNECTORS SETTING..................................................3-3

3.4. SRAM INSTALLATION AND JUMPERS SETUP..........................................3-4

3.5. CPU INSTALLATION AND JUMPERS SETUP ............................................3-4

3.6. DRAM INSTALLATION ..................................................................................3-6

3.7. SPEAKER CONNECTOR INSTALLATION...................................................3-6

3.8. POWER LED & KEY LOCK CONNECTOR INSTALLATION.......................3-6

3.9. TURBO SWITCH CONNECTOR INSTALLATION........................................3-6

3.10. TURBO LED CONNECTOR INSTALLATION.............................................3-6

3.11. HARDWARE RESET SWITCH CONNECTOR INSTALLATION................3-6

3.12. GREEN FUNCTION INSTALLATION..........................................................3-7

3.13. PERIPHERAL DEVICE INSTALLATION.....................................................3-7

4.BIOS CONFIGURATION .........................................................................................4-1

4.1. ENTERING SETUP........................................................................................4-1

4.2. CONTROL KEYS............................................................................................4-1

4.3. GETTING HELP .............................................................................................4-2

4.3.1.Main Menu.............................................................................................4-2

4.3.2.Status Page Setup Menu / Option Page Setup Menu..........................4-2

4.4. THE MAIN MENU...........................................................................................4-2

4.5. STANDARD CMOS SETUP MENU...............................................................4-4

4.6. BIOS FEATURES SETUP..............................................................................4-7

4.7. CHIPSET FEATURES SETUP ......................................................................4-9

4.8. POWER MANAGEMENT SETUP..................................................................4-11

4.9. PCI / IDE CONFIGURATION SETUP............................................................4-13

4.10. LOAD BIOS DEFAULTS..............................................................................4-15

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3

GA-486AS
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4.11. LOAD SETUP DEFAULTS...........................................................................4-16

4.12. PASSWORD SETTING................................................................................4-17

4.13. IDE HDD AUTO DETECTION .....................................................................4-18

4.14. HDD LOW LEVEL FORMAT........................................................................4-19

4.15. SAVE & EXIT SETUP ..................................................................................4-20

4.16. EXIT WITHOUT SAVING.............................................................................4-21

4.17. KEYBOARD SETTING FUNCTION.............................................................4-21

5.AT TECHNICAL INFORMATION.............................................................................5-1

5.1. BUS CONNECTOR PIN OUT........................................................................5-1

5.1.1.ISA BUS SLOT PIN OUT......................................................................5-1

5.1.2.PCI BUS SLOT PIN OUT......................................................................5-2

5.2. I/O & MEMORY MAP .....................................................................................5-3

5.3. TIMER & DMA CHANNELS MAP..................................................................5-3

5.4. INTERRUPT MAP ..........................................................................................5-4

5.5. RTC & CMOS RAM MAP...............................................................................5-4

APPENDIX A: POST MESSAGE................................................................................A-1

APPENDIX B: POST CODES.....................................................................................B-1

APPENDIX C: BIOS DEFAULT DRIVE TABLE .........................................................C-1

APPENDIX D: PROBLEM SHEET..............................................................................D-1

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4

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Introduction

1INTRODUCTION

1.1 PREFACE

Welcome to use the GA-486AS motherboard. The motherboard is a 128 KB - 1 MB
CACHE 486DX series PC/AT compatible system with ISA bus, PCI (Peripheral
Component Interconnect) bus and has been designed to be the fastest 486 PC/AT
system and the GREEN FUNCTION (Power-Down Mode). There are some new
features allowing you to operate the system with just the performance you want.

This manual also explains how to install the motherboard for operation, and how to set
up your CMOS CONFIGURATION with BIOS SETUP program.

1.2 KEY FEATURES

• 80486 based PC/AT compatible mainboard with ISA and PCI Bus.

• Supports 3 Master PCI bus slots .

• Supports 486SX / DX / DX2 / S-Series / OverDrive / P24D / P24T / DX4 running at

25 - 100 MHz.

• Supports True Green Function.

• Supports Intel, AMD, Cyrix and UMC CPU.

• Supports 237 pins (Socket 3) ZIF White socket / LIF socket on board.

• Supports 128 / 256 / 512 KB / 1 MB 2nd cache memory operated in BURST mode.

• Supports Write-Through / Write-Back cache operation.

• Supports 1 - 128 MB DRAM memory on board.

• Supports 2 channels Enhance PCI IDE ports for 4 IDE Devices.

• Supports 2 x COM (16550) ports, 1 x LPT (EPP / ECP) port, 1 x Floppy port.

• Supports shadow RAM for BIOS & VIDEO BIOS.

• Supports shadow RAM cacheable function to improve performance.

• Supports Hardware & Software speed change function.

• Licensed AWARD BIOS.

• 2/3 Baby AT size (22 cm x 25 cm) with 4 AT slots and 3 PCI slots .

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1-1

GA-486AS
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1.3 PERFORMANCE LIST

The following performance data list is the testing results with some popular benchmark
testing programs. These datas are just reference for users and there is no responsibility
for different testing data values gotten by users.( The different H/W & S/W configuration
will result in different benchmark testing results.)

• CPU : 486DX4-100 / 75, DX2-66 / 50, P24T 63 • Config.sys: • Autoexec.bat:

• DRAM : 32 MB / 70ns DEVICE = C:\DOS\SETVER.EXE C:\DOS\SMARTDRV.EXE /X

• CACHE : 256KB DEVICE = C:\SISIDE\SISDR.SYS @ECHO OFF

• VGA : ATi Mach64 4MB VRAM DEVICE = C:\DOS\HIMEM.SYS PROMPT $p$g

• H.D. : CONNER CFA540A DOS = HIGH PATH C:\;C:\DOS

• O.S. : MS DOS V6.22 FILES = 30 SET TEMP = C:\DOS

¡° Using Intel DX4-100 / 75

Software Item Unit P24T 63 WB DX4-100x3 DX4-75x3
LandMark Speed CPU MHz 361.38 364.10 273.05
V2.0 FPU MHz 1202.89 885.38 663.97

Norton SI CPU index 198.4 198.5 148.8
V8.0 DISK index 15.5 15.5 15.5

Power Meter MIPS Mips 28.2 28.7 21.7
V1.81 CPU/MEM Agg. PMUs 45015.0 39212.0 29354.0

PC Bench mark DOS Mark index 579.96 605.81 484.26
V9.0 CPU mark 16 index 111.40 113.52 84.78

System Benchmarks At DOS Environment with IDE Controller

Video chr/ms 7620.00 10031.00 7620.00

Overall index 137.0 137.4 104.3

Data-Xfer KB/sec 32233.8 32233.8 32233.8
DISK Agg. PMUs 4888.7 4883.6 4886.6

Video Score index 3417.32 4431.14 3481.2
DISK Score index 384.71 392.68 337.60

Software Item Unit DX2-66 DX2-50
LandMark Speed CPU MHz 223.52 167.63
V2.0 FPU MHz 590.23 442.64

Video chr/ms 10031.00 7620.00
Norton SI CPU index 144.3 108.2
V8.0 DISK index 15.6 15.6

Overall index 101.3 77.2
Power Meter MIPS Mips 21.1 15.7
V1.81 CPU/MEM Agg. PMUs 26242.3 19423.7

Data-Xfer KB/sec 32233.8 32233.8

DISK Agg. PMUs 4883.6 4885.3
PC Bench mark DOS Mark index 481.40 378.25
V9.0 CPU mark 16 index 84.07 62.78

Video Score index 4411.34 3461.05

DISK Score index 322.00 267.76

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1-2

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Introduction

1.4 BLOCK DIAGRAM

486 Series CPU

DATA
SRAM

Host Data Bus

Host Address Bus

TAG
SRAM

IDE

BUFFER

Dual Channels
IDE Connector

PCM DRAM ATM

Sis 85C496 Sis 85C497

PCI

SLOT

F-S LINK BUS

X-BUS

SD[15:8]

BIOS KBC BUFFER

SD[7:0]

SLOT

SA[9:0]

ISA

1.5 INTRODUCE THE PCI-BUS

Connecting devices to a local bus of CPU can dramatically increase the speed of I/O­bound peripherals with only a slight increase in cost over traditional systems. This
price/performance point has created a vast market potential for local bus products. The
main barrier to this market has been the lack of an accepted standard for local bus
peripherals.

The PCI-bus standard, under development since Jun. 1992, which is designed to bring
workstation-level performance to standard PC platform. The PCI-bus removes many of
the bottlenecks that have hampered PC for several years. On the PCI-bus, peripherals
operate at the native speed of the computer system, thus enabling data transfer
between peripherals and the system at maximum speed. This performance is critical for
bandwidth-constrained devices such as video, multimedia, mass storage and
networking adapters.

PCI-bus standard provide end-users with a low-cost, extendible and portable local bus
design, which will allow systems and peripherals from different manufacturers to work
together.

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1-3

GA-486AS

−

128 / 256 / 512 KB / 1 MB 2nd cache memory on board.

−

Support 486 Burst mode on 2nd cache memory access.

−

Supports 1 x EPP/ECP LPT port. (Using DMA3 & IRQ7)

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2 SPECIFICATION

2.1 HARDWARE

• CPU − 80486SX/DX/DX2/S-Series, 80487SX, OverDrive,

P24D, P24T, DX4.

− 237 pins (Socket 3) ZIF white socket / LIF socket on

board.

• COPROCESSOR − Coprocessor included in 80486DX.

• SPEED − 25 / 33 MHz system

− 25 - 33 MHz PCI- bus speed.

− 8 MHz (programmable) AT Bus speed.

− Hardware and Software speed switchable function.

• GREEN FUNCTION − Support Suspend mode 10 sec to 40 min.

− Power Down Timer from 0.25 min to 512 min.

− When enter Power Down Mode, 16 MHz system speed

for non S-Series and 0 MHz system speed for Intel &
Cyrix S-Series.

− Ext. Power Control Port for Monitor Power ON / OFF

− Support IDE Hard Disk Standby Mode control.

− Wake Up by all IRQ, DMA, and PCI Master Devices.

− Support Green LED Indicator and Green Switch.

• DRAM MEMORY − 4 banks 72 pins SIMM module sockets on board.

− DRAM type can be 256K / 512K x 32 / 36,

1M / 2M x 32 / 36, 4M / 8M x 32 / 36.

− Support Fast Page DRAM access mode.

• CACHE MEMORY − 8 KB cache memory included in 80486 DX / SX / DX2 /

SX2 and AMD DX4.

− 16 KB cache memory included in INTEL DX4.

• SHADOW RAM − Main BIOS shadow function programmable.

− Video BIOS shadow function programmable.

− Shadow RAM cacheable function programmable.

• IDE PORTS − 2 Enhanced IDE channels on board.(Using IRQ14,15)

− Support Mode 4 IDE & ATAPI CD-ROM.

− Driver Support DOS, WINDOWS, OS/2, NT, Novell.

• I/O PORTS − Supports 2 x 16550 COM ports. (Using IRQ4,3)

− Supports 1 x Floppy port. (Using DMA2 & IRQ6)

• I/O BUS SLOTS − 4 AT-bus.

− 3 PCI-bus.

• DIMENSION − 2/3 Baby AT size (22 cm x 25 cm).

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2-1

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Specification

2.2 SOFTWARE

• BIOS − Licensed AWARD BIOS.

− AT CMOS Setup, Advanced / Chipset Setup and Power

Management included.

• O. S. − Operation with MS-DOS, WINDOWS NT,OS/2,

NOVELL, SCO UNIX.

2.3 ENVIRONMENT

• AMBIENT TEMP.

− °C to +50 C (operating).

• − 0 to +85% (operating).

ALTITUDE −

• VIBRATION 0 to 1,000 Hz.

• − 4.9 V to 5.2 V.

3 A to 5 A current.

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2-2

GA-486AS
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3 HARDWARE INSTALLATION

3.1 UNPACKING

The ainboard ackage hould ontain he ollowing:

• The A-486AS ainboard

• User's manual

• A Driver Diskette

The mainboard contains sensitive electric components which can be easily damaged by
static electricity, so the mainboard should be left in its original packing until it is installed.

Unpacking and installation should be done on a grounded anti-static mat. The operator
should be wearing an anti static wristband, grounded at the same point as the anti-static
mat.

Inspect the mainboard carton for obvious damage. Shipping and handling may cause
damage to your board. Be sure there are no shipping and handling damages on the
board before proceeding.

After opening the mainboard carton, extract the system board and place it only on a
grounded anti-static surface component side up. Again inspect the board for damage.
Press down on all of the socket IC's to make sure that they are properly seated. Do this
only on with the board placed on a firm flat surface.

M

Do not apply power to the board if it has been damaged..

You are now ready to install your mainboard. The mounting hole pattern on the
mainboard matches the IBM-XT system board. It is assumed that the chassis is
designed for a standard IBM XT/AT mainboard mounting.

Place the chassis on the anti-static mat and remove the cover. Take the plastic clips,
Nylon stand-off and screws for mounting the system board, and keep them separate.

A summary of Jumper Setting

¡i Intel 486 Series ¡j

CPU Type JP14 RN1 RN2 RN3 JP30 JP31 JP20 JP23 JP27 JP28 JP29

SX-25/SX2-50
DX-25/DX2-50
DX-33/DX2-66
P24T-63 WT
P24T-63 WB
P24T-83 WT
P24T-83 WB
P24D WT
P24D WB
DX2-50 OverDrive
DX2-66 OverDrive
DX4-75 OverDrive
DX4-100 OverDrive
DX4-75 ¡]3.3 V¡^
DX4-100¡]3.3 V¡^

¡i AMD 486 Series ¡j

CPU Type JP14 RN1 RN2 RN3 JP30 JP31 JP20 JP23 JP27 JP28 JP29

X X O O X O X O 2-3 2-3 O
X X O O X O X O 2-3 1-2 O
O X O O X O X O 2-3 1-2 O
X X O O X O X O 2-3 1-2 O
X X O O X O X X 2-3 1-2 O
O X O O X O X O 2-3 1-2 O
O X O O X O X X 2-3 1-2 O
O X O O X O X O 2-3 1-2 O
O X O O X O X O 1-2 1-2 O
X X O O X O X O 2-3 1-2 O
O X O O X O X O 2-3 1-2 O
X X O O X O X O 2-3 1-2 O
O X O O X O X O 2-3 1-2 O
X X O O X O X O 2-3 1-2 X
O X O O X O X O 2-3 1-2 X

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3-1

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Enhanced DX2-66 WT¡]3.3 V¡^
Enhanced DX2-66 WB¡]3.3 V¡^
Enhanced DX4-100 WT¡]3.3 V¡^
Enhanced DX4-100 WB¡]3.3 V¡^
DX2-66 N. E.¡]3.3 V¡^
DX4-100 N. E.¡]3.3 V¡^

O X O O X X O O 2-3 1-2 X
O X O O X X O O 1-2 1-2 X
O X O O X X X O 2-3 1-2 X
O X O O X X X O 1-2 1-2 X
O X O O X X X O 2-3 1-2 X
O X O O X X X O 1-2 1-2 X

¡i Cyrix 486 Series ¡j

Hardware Installation

CPU Type JP14 RN1 RN2 RN3 JP30 JP31 JP20 JP23 JP27 JP28 JP29

DX2-50
DX2-66
DX2-66 (3.3V)

X O X X O X X O 2-3 1-2 O
O O X X O X X O 2-3 1-2 O
O O X X O X X O 2-3 1-2 X

¡i UMC 486 Series ¡j

CPU Type JP14 RN1 RN2 RN3 JP30 JP31 JP20 JP23 JP27 JP28 JP29

U5SX-33

O X O O X X X O 2-3 2-3 O

O: Jumper or Resistor Installed
X: Jumper or Resistor Not Installed

3.2 MAINBOARD LAYOUT

×GA-486ASØ

+ + + +

1 1 1

J

J2J

J1J

P

P

J

2

4

3

J
P

J

3

4

DATA CACHE

DATA CACHE

JP29

JP30

RN1

JP31

RN2
RN3

P
1

JP10

JP23

JP20

U1

85C497

J

J

J

1

GA-486AS

P

P

P

9

8

7

U10

85C496

T
A
G

R
A
M

1

JP27

1

JP28

1
1
1

CPU

SL2

SL4

SL6

SL8

JP14

PCI 1

PCI 2

PCI 3

IDE 1
IDE 2

SL1

SL3

SL5

SL7

1
1

SIMM 1
SIMM 2
SIMM 3
SIMM 4

BIOS

CN 2
CN 4

J5

+

1
1

JP5

U13

UM8886AF

COM 2/4

CN 1

COM 1/3

CN 3

1

1

J7

1
1
1

1

1

J9

1

JP24

1

GND

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3-2

GA-486AS
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3.3 JUMPERS AND CONNECTORS SETTING

• CONNECTOR SETTING

w J2: Reset Connector

Open Normal operation.
Close Hardware reset system.

w J3: Turbo Switch Connector

1 - 2 Low speed.
2 - 3 High speed. (Default)

w J5: External Battery Connector

1 Battery Anode (+).
2 NC.
3 GND.
4 Battery Cathode(-).

w JP1: HDD LED (On board layout, "+" is LED anode)

Onboard IDE Hard disk Read/Write indicator.

w JP2: Turbo LED (On board layout, "+" is LED anode)

This jumper is for Turbo LED.

w JP3: Speaker Connector

1 Data.
2 GND.
3 GND.
4 VCC (+5V).

w JP5: CMOS Data Clear / Power Supply Jumper.

1 - 2 Close for Normal Operation.
2 - 3 Close for Not Supplying Power to CMOS RTC (Clear).

w J4: Power LED & Key-Lock Connector

1 LED anode (+).
2 NC.
3 LED cathode (-).
4 Key-lock.
5 GND.

w J9: Keyboard Connector

1 Keyboard clock.
2 Keyboard data.
3 NC.
4 VCC (+5V).
5 GND.

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3-3

______________________________________________________________________

w J7: Power Supply Connector

1 Power good signal.

2,10,11,12 VCC (+5V).

3 +12V.
4 -12V.

5,6,7,8 GND.

9 -5V.

Hardware Installation

• GREEN FUNCTION JUMPER SETTING

w J1: Brake Switch

w JP4: Green LED (On board layout, "+" is LED anode)

Shorting this jumper and then releasing it immediately will force system
into Green mode right away.

When system gets into Green, the LED on this jumper will be light.

w JP24: Green Power Connector (On board layout, "+" is positive voltage)

If your power supply has signal to control the A.C. output, and then the
signal can be connected to this connector; when system gets into
Green mode, your power supply A.C. output will be turned OFF. By
this way, you can control your monitor ON/OFF or other devices.

3.4SRAM INSTALLATION AND JUMPERS SETUP

The cache memory system consists of two parts, one is TAG SRAM, the other is DATA
SRAM. The TAG SRAM type used in this mainboard is 8Kx8, 16Kx8, 32Kx8 or 64Kx8 ­15ns, and the DATA SRAM type is 8Kx8-15ns, 32Kx8-15ns 64Kx8-20ns or 128Kx8­20ns.

The mainboard can be installed with 128, 256, 512 KB or 1MB cache memory when
using 8Kx8 or 32Kx8 or 64Kx8 or 128Kx8 type DATA SRAM respectively.

• CACHE MEMORY SIZE SETTING

1 BANK 128K
2 BANK 256K 512K 1M

JP7 OFF ON ON ON
JP8 OFF OFF ON ON
JP9 OFF OFF OFF ON

JP10 1 - 2 2 - 3 2 - 3 2 - 3

U15 8K x 8 16K x 8 32K x 8 64K x 8

U6-U9 32K x 8 32K x 8 64K x 8 128K x 8

U17-U20 32K x 8 64K x 8 128K x 8

3.5 CPU INSTALLATION AND JUMPERS SETUP

The CPU is a sensitive electric component and it can be easily damaged by static
electricity, so users must keep it away from metal surface when the CPU is installed
onto mainboard.

When the user installs the CPU on socket, please notice the PIN 1 of CPU is in the
same corner as the PIN 1 of socket!

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3-4

GA-486AS
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Before the CPU is installed, the mainboard must be placed on a flat plane in order to
avoid being broken by the pressure of CPU installation.

• CPU CLOCK SETTING

The system speed depends on the frequency of CLOCK GENERATOR. The user can
change the clock selection jumper to set up the system speed at 25, 33 ,40 or 50 MHz
for different CPU speeds.

The mainboard can use 80486DX, DX2, SX, SX2 OverDrive, P24T, P24D and DX4
CPU, and the CPU speed must match with the frequency of CLOCK GEN. It will cause
system hanging up if the CLOCK GEN.'S frequency is higher than CPU's.

Refer to the following table to set up the CPU clock:

CPUCLK 25 MHz 33 MHz

JP14 OFF ON

• CPU BRAND SELECTION

BRAND JP30 JP31 RN1 RN2 RN3

AMD, UMC OFF OFF OFF Installed Installed

Intel OFF ON OFF Installed Installed

Cyrix ON OFF Installed OFF OFF

• CPU TYPE SELECTION

w JP20:

Short DX4 x 2 for Intel & AMD Enhanced.
Open DX4 x 3 for Intel & AMD Enhanced.

w JP23:

Short P24T WT.
Open P24T WB.

w JP27:

1 - 2 P24D & AMD Enhance WB, AMD DX4 x 3 (Not Enhance Type).
2 - 3 P24D & AMD Enhance WB, AMD DX4 x 2 (Not Enhance Type).

w JP28: DX or SX CPU Selection

1 - 2 For DX, DX2 OverDriver, DX4 Type CPU.
2 - 3 For SX Type CPU.

Note: Please remember set CPU internal cache to WB in BIOS CHIPSET FEATURES

SETUP, if you already set JP23 or JP27 to support WB CPU.

• CPU VOLTAGE SELECTION

VOLTAGE JP29

3.3V Open
5V Short

3.6 DRAM INSTALLATION

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3-5

______________________________________________________________________
This mainboard can be installed with 1, 2, 4, 8, 16 or 32 MB 72 pins SIMM module
DRAM. The DRAM speed of both mainboard is using 60/70 ns. The banks of memory
system on the mianboard includes from SIMM 1 to SIMM 4.

The DRAM installation position refer to MAINBOARD LAYOUT, and notice the PIN -1 of
SIMM module must match with the PIN -1 of SIMM socket when the DRAM SIMM
module is installed.

Insert the DRAM SIMM module into the SIMM socket at 45 degree angle. If there is a
wrong direction of PIN -1, the DRAM SIMM module couldn't be inserted into socket
completely. After completely insert SIMM module into socket, then press the SIMM
module in vertical direction until the left and right metal holders can keep the SIMM
module standing up con-firmly.

Hardware Installation

3.7 SPEAKER CONNECTOR INSTALLATION

There is always a speaker in AT system for sound purpose. The 4-Pins connector (JP3)
is used to connect speaker. The speaker can work well in both direction of connector
when it is installed to the connector (JP3) on mainboard.

3.8 POWER LED & KEY LOCK CONNECTOR INSTALLATION

There are a system power LED lamp and a key on the panel of case. The power LED
will light on when system is powered-on, and the key can lock the keyboard input or
unlock it, both of them are connected to a 5 PIN connector. The connector should be
installed to J4 of mainboard in correct direction.

3.9 TURBO SWITCH CONNECTOR INSTALLATION

The TURBO switch on the panel is used for controlling the system speed. Some
program developed on XT should be executed with a low speed system, so a high
speed system needs the speed switching function to change its running speed.

Because a 80486 CPU cannot accept the real clock speed change when program is
executed, so the mainboard uses cache-enable or disable function to simulate TURBO
switching function. The J3 on mainboard should be connected to the TURBO switch on
panel, and user can push in or pop out the TURBO switch to enable or disable the
cache function of system.

3.10TURBO LED CONNECTOR INSTALLATION

The TURBO LED on panel can indicate the current speed status of system. The
TURBO LED connector should be installed to JP2 in correct direction.

3.11HARDWARE RESET SWITCH CONNECTOR INSTALLATION

The Reset switch on panel provides users with Hardware Reset function which is almost
the same as power on / off. The system will do a cold start after the Reset switch is
pushed and released at once. The Reset switch is a 2 PIN connector and should be
installed to J2 on mainboard.

3.12GREEN FUNCTION INSTALLATION

For the purpose of power saving, there are two jumpers, J1 and JP4, to make sure the
power saving function doing well. The JP4 is a indicator (Green LED) for Green function.

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3-6

GA-486AS
______________________________________________________________________
If the green LED is ON, the system is operating in green mode. The J1 is a switch to
force the system into Green mode immediately.

3.13PERIPHERAL DEVICE INSTALLATION

If a PCI-bus device is to be installed in the system, any one of three PCI-bus slots can
be used no matter what Slave or Master PCI-bus device being installed.

After the peripheral device installed, the user should check everything again, and
prepare to power-on the system. Now, the mainboard can be mounted into the case and
fixed with screws.

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3-7

______________________________________________________________________

BIOS Configuration

4 BIOS CONFIGURATION

Award's BIOS ROM has a built-in Setup program that allows users to modify the basic
system configuration. This type of information is stored in battery-backed CMOS SRAM
so that it retains the Setup information when the power is turned off.

4.1 ENTERING SETUP

Power ON the computer and press <Del> immediately will allow you to enter Setup. The
other way to enter Setup is to power on the computer, when the below message
appears briefly at the bottom of the screen during the POST (Power On Self Test),
press <Del> key or simultaneously press <Ctrl>,<Alt>,and <Esc> keys.

• TO ENTER SETUP BEFORE BOOT PRESS CTRL-ALT-ESC OR DEL KEY

If the message disappears before you respond and you still wish to enter Setup, restart
the system to try again by turning it OFF then ON or pressing the "RESET" bottom on
the system case. You may also restart by simultaneously press <Ctrl>,<Alt>,and<Del>
keys. If you do not press the keys at the correct time and the system does not boot, an
error message will be displayed and you will again be asked to,

• PRESS F1 TO CONTINUE, CTRL-ALT-ESC OR DEL TO ENTER SETUP

4.2 CONTROL KEYS

Up arrow Move to previous item
Down arrow Move to next item
Left arrow Move to the item in the left hand
Right arrow Move to the item in the right hand
Esc key Main Menu - Quit and not save changes into CMOS

PgUp key Increase the numeric value or make changes
PgDn key Decrease the numeric value or make changes
F1 key General help, only for Status Page Setup Menu and Option Page

F2 key Change color from total 16 colors
F3 key Calendar, only for Status Page Setup Menu
F4 key Reserved
F5 key Restore the previous CMOS value from CMOS, only for Option Page

F6 key Load the default CMOS value from BIOS default table, only for
F7 key Load the default

F8 key Reserved
F9 key Reserved
F10 key Save all the CMOS changes, only for Main Menu

Status Page Setup Menu and Option Page Setup Menu - Exit current
page and return to Main Menu

Setup Menu

Setup Menu
Option Page Setup Menu

______________________________________________________________________

4-1

GA-486AS
______________________________________________________________________

4.3 GETTING HELP

4.3.1Main Menu

The on-line description of the highlighted setup function is displayed at the bottom of the
screen.

4.3.2Status Page Setup Menu / Option Page Setup Menu

Press F1 to pop up a small help window that describes the appropriate keys to use and
the possible selections for the highlight item. To exit the Help Window press <Esc>.

4.4 THE MAIN MENU

Once you enter Award BIOS CMOS Setup Utility, the Main Menu (Figure 1) will appear
on the screen. The Main Menu allows you to select from nine setup functions and two
exit choices. Use arrow keys to select among the items and press <Enter> to accept or
enter the sub-menu.

¡iFigure 1¡j

ROM PCI/ISA BIOS ( 2A4IBG01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

PCI/IDE CONFIGURATION SETUP

LOAD BIOS DEFAULTS

LOAD SETUP DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Time, Date, Hard Disk Type ...

PASSWORD SETTING

IDE HDD AUTO DETECTION

HDD LOW LEVEL FORMAT

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

: Select Item
: Change Color

______________________________________________________________________

4-2

______________________________________________________________________

BIOS Configuration

• Standard CMOS setup

This setup page includes all the items in a standard compatible BIOS.

• BIOS features setup

This setup page includes all the items of Award special enhanced features.

• Chipset features setup

This setup page includes all the items of chipset special features.

• Power Management Setup

This setup page includes all the item of power management features.

• PCI/IDE Configuration Setup

This setup page includes all the configurations of PCI slots parameters and onboard
I/O setting.

• Load BIOS Defaults

BIOS defaults indicates the most appropriate value of the system parameter which
the system would be on more safety operation.

• Load SETUP Defaults

SETUP defaults indicate the most appropriate value of the system parameter which
the system would be in maximum performance.

• Password setting

Change, set, or disable password. It allows you to limit access to the system and
Setup, or just to Setup.

• IDE HDD auto detection

Automatically configure hard disk parameter.

• HDD low level format

HDD low level format utility.

• Save & exit setup

Save CMOS value changes to CMOS and exit setup.

• Exit without save

Abandon all CMOS value changes and exit setup.

______________________________________________________________________

4-3

GA-486AS

16

______________________________________________________________________

4.5 STANDARD CMOS SETUP MENU

The items in Standard CMOS Setup Menu (Figure 2) are divided into 11 categories.
Each category includes none, one or more than one setup items. Use the arrows to
highlight the item and then use the <PgUp> or <PgDn> keys to select the value you
want in each item.

¡iFigure 2¡j

ROM PCI/ ISA BIOS ( 2A4IBG01 )

STANDARD CMOS SETUP

AWARD SOFTWARE, INC.

Date (mm:dd:yy)
Time (hh:mm:ss)

HARD DISKS TYPE SIZE

Primary Master

Secondary Master
Secondary Slave

Drive A

: 1.44 M, 3.5 in.

Drive B

: 1.2 M, 5.25 in.

Video

: EGA/VGA

Halt On : No Errors

ESCF1: Quit

: Help (Shift)F2

: Mon,
: 15 : 55 : 25

: User
: NonePrimary Slave
: None
: None

May 08

540

0
0
0

1995

CYLS HEAD PRECOMP LANDZ SECTOR

1048

: Select Item

: Change Color

65535 1047 63

Base Memory:

Extended Memory:

Other Memory:

Total Memory:

NORMAL

------------- 0 0 0 0 0

------------- 0 0 0 0 0

------------- 0 0 0 0 0

640 K

31744 K

384 K

32768 K

PU/PD/+/- : Modify

• Date

The date format is <day>, <date> <month> <year>.
Press <F3> to show the calendar.

day The day, from Sun to Sat, determined by

the BIOS and is display-only

dateThe date, from 1 to 31 (or the maximum

allowed in the month)

monthThe month, Jan. through Dec.

MODE

______________________________________________________________________

4-4

______________________________________________________________________

BIOS Configuration

yearThe year, from 1900 through 2099

• Time

The time format in <hour> <minute> <second>. The
time is calculated base on the 24-hour military­time clock. For example, 1 p.m. is 13:00:00.

______________________________________________________________________

4-5

GA-486AS
______________________________________________________________________

• Primary Master / Slave, Secondary Master / Salve

The category identify the types of hard disk
drive C or drive F 4 devices that has been
installed in the computer. There are 46 pre­defined types and a user definable type. Type 1
to Type 46 are pre-defined. Type User is user­definable.

Press PgUp or PgDn to select a numbered hard disk
type or type the number and press <Enter>. Note
that the specifications of your drive must match
with the drive table. The hard disk will not work
properly if you enter improper information for
this category. If your hard disk drive type is
not matched or listed, you can use Type User to
define your own drive type manually.

If you select Type User, related information is
asked to be entered to the following items. Enter
the information directly from the keyboard and
press <Enter>. Those information should be
provided in the documentation form your hard disk
vendor or the system manufacturer.

CYLS number of cylinders
HEAD number of heads
PRECOMP write precom
LANDZ landing zone
SECTOR number of sectors

If a hard disk has not been installed select NONE
and press <Enter>.

______________________________________________________________________

4-6

______________________________________________________________________

• Drive A type / Drive B type

BIOS Configuration

The category identify the types of floppy disk
drive A or drive B that has been installed in the
computer.

None No floppy drive installed
360K,

5.25 in.

1.2M,

5.25 in.

5-1/4 inch PC-type double-sided
drive; 360 kilobyte capacity
5-1/4 inch AT-type double-sided and
high-density drive; 1.2 megabyte
capacity

720K,

3.5 in.

1.44M,

3.5 in.

2.88M,

3.5 in.

3-1/2 inch double-sided drive; 720
kilobyte capacity
3-1/2 inch double-sided and high­density drive; 1.44 megabyte capacity
3-1/2 inch double-sided drive; 2.88
megabyte capacity

• Video

The category detects the type of adapter used for
the primary system monitor that must match your
video display card and monitor. Although
secondary monitors are supported, you do not have
to select the type in setup.

EGA/VGAEnhanced Graphics Adapter/Video

Graphics Array. For EGA, VGA, SVGA, or
PGA monitor adapters.

CGA 40 Color Graphics Adapter, power up in 40

column mode.

CGA 80 Color Graphics Adapter, power up in 80

______________________________________________________________________

4-7

GA-486AS
______________________________________________________________________

column mode.

MONO Monochrome adapter, includes high

resolution monochrome adapters.

______________________________________________________________________

4-8

______________________________________________________________________

• Halt on

BIOS Configuration

The category determines whether the computer will
stop if an error is detected during power up.

All errors Whenever the BIOS detects a non-

fatal error the system will be
stopped and you will be prompted

No errors The system boot will not stop for

any error that may be detected
All, But
Keyboard

The system boot will not stop for

a keyboard error; it will stop for

all other errors
All, But
Diskette

The system boot will not stop for

a disk error; it will stop for all

other errors
All, But
Disk/Key

The system boot will not stop for

a keyboard or disk error; it will

stop for all other errors

• Memory

The category is display-only which is determined
by POST (Power On Self Test) of the BIOS.

Base Memory

The POST of the BIOS will determine the amount
of base (or conventional) memory installed in
the system. The value of the base memory is
typically 512 K for systems with 512 K memory
installed on the motherboard, or 640 K for

______________________________________________________________________

4-9

GA-486AS
______________________________________________________________________

systems with 640 K or more memory installed on
the motherboard.

Extended Memory

The BIOS determines how much extended memory is
presented during the POST. This is the amount
of memory located above 1 MB in the CPU's
memory address map.

Expanded Memory

Expanded Memory in memory defined by the
Lotus/Intel/Microsoft (LIM) standard as EMS.
Many standard DOS applications can not utilize
memory above 64KB, the Expanded Memory
Specification (EMS) swaps memory which is not
utilized by DOS with a section, or frame, so
these applications can access to all of the
system memory. Memory can be swapped by EMS is
usually 64KB within 1 MB or memory above 1 MB,
depending on the chipset design.

Expanded memory device driver is required to
use memory as Expanded Memory.

Other Memory

This refers to the memory located in the 640KB
to 1024KB address space. This is the memory
that can be used for different applications.
DOS uses this area to load device drivers to
keep as much base memory free for application
programs. Most use for this area is Shadow RAM.

______________________________________________________________________

4-10

______________________________________________________________________

BIOS Configuration

4.6 BIOS FEATURES SETUP

ROM PCI/ISA BIOS ( 2A4IBG01 )

BIOS FEATURES SETUP

AWARD SOFTWARE, INC.

Security Option : Setup
Virus Warning
CPU Internal Cache
External Cache
Quick Power On Self Test : Enabled
Boot Sequence
Swap Floppy Drive : Disabled
Boot Up Floppy Seek
Boot Up NumLock Status
Turbo SW Function Enable

: Disabled
: Enabled
: Enabled

: A, C

: Enabled
: Off
: Yes

Video BIOS Shadow
C8000 - CFFFF Shadow
D0000 - D7FFF Shadow
D8000 - DFFFF Shadow

: Enabled
: Disabled
: Disabled
: Disabled

ESC

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

PU/PD/+/­(Shift)F2

: Select Item
: Modify
: Color

• Security Option

The default value is Setup.

Setup Asking password when enter CMOS Setup.
System Asking password when enter CMOS Setup and boot system.

• Virus Warning

This category flashes on the screen. During and after the system boots up, any
attempt to write to the boot sector or partition table of the hard disk drive will halt the
system and the following error message will appear, in the mean time, you can run
anti-virus program to locate the problem. The default value is Disabled.

Enabled Activate automatically when the system boots up and causes a

warning message to appear when anything attempts to access to
the boot sector or hard disk partition table.

Disabled No warning message to appear when anything attempts to access

to the boot sector or hard disk partition table.

• CPU Internal Cache / External Cache

These two categories speed up memory access. However, it depends on CPU /
chipset design. The default value is Enabled.

Enabled Enable cache.
Disabled Disable cache.

______________________________________________________________________

4-11

GA-486AS
______________________________________________________________________

• Quick Power On Self Test

This category speeds up Power On Self Test (POST) after you power on the
computer. If it is set to Enable, BIOS will shorten or skip some check items during
POST. The default value is Enabled.

Enabled Enable quick POST.
Disabled Normal POST.

• Boot Sequence

This category determines which drive computer searches first for the disk operating
system (i.e., DOS). The default value is A,C.

A,C System will first search for floppy disk drive and then hard disk drive.
C,A System will first search for hard disk drive and then floppy disk drive.

• Swap Floppy Drive

The default value is Disabled.

Enabled Floppy A & B will be swapped under DOS.
Disabled Floppy A & B will be normal definition.

• Boot Up Floppy Seek

During POST, BIOS will determine if the floppy disk drive installed is 40 or 80 tracks.
360 type is 40 tracks while 720,1.2 and 1.44 are all 80 tracks.

The default value is Enabled.

Enabled BIOS searches for floppy disk drive to determine if it is 40 or 80

Disabled BIOS will not search for the type of floppy disk drive by track

tracks, Note that BIOS cannot tell from 720, 1.2 or 1.44 drive type

as they are all 80 tracks.
number. Note that there will not be any warning message if the

driver installed is 360.

• Boot Up NumLock Status

The default value is Off.

On Keypad is number keys.
Off Keypad is arrow keys.

• Turbo SW Function Enable

The default value is Yes.

Yes Enable IDE HDD Block Mode.
No Disable IDE HDD Block Mode.

• Video BIOS Shadow

It determines whether video BIOS will be copied to RAM, however, it is optional
from chipset design. Video Shadow will increase the video speed. The default value
is Enabled.

Enabled Video shadow is enabled.
Disabled Video shadow is disabled.

______________________________________________________________________

4-12

______________________________________________________________________

BIOS Configuration

• C8000 - CFFFF Shadow / D0000 - DFFFF Shadow

These categories determine whether optional ROM will be copied to RAM by 16K
byte. The default value are Disabled.

Enabled Optional shadow is enabled.
Disabled Optional shadow is disabled.

4.7 CHIPSET FEATURES SETUP

ROM PCI/ISA BIOS ( 2A4IBG01 )

CHIPSET FEATURES SETUP

AWARD SOFTWARE, INC.

Auto Configuration
ISA Bus Clock
Cache Write Cycle
Cache Burst Read Cycle
L2 Cache / DRAM Cycle WS
DRAM Speed
CPU Internal Cache

• Auto Configuration

The default value is Enable.

Enable To Enable auto configuration function.
Disable To Disable auto configuration function.

• ISA Bus Clock

The default value is 1/4 PCLK.

1/3 PCLK For 25 MHz system.
1/4 PCLK For 33 MHz system.

• Cache Write Cycle

The default value is 2 CCLK.

2 CCLK
3 CCLK

For system speed ¡Ø 33 MHz.
For system speed ¡Ö 33 MHz.

: Enable
: 1/4 PCLK
: 2 CCLK
: 1 CCLK
: 2 CCLK
: Fastest
: Write Thru

Onboard FDD Controller
Onboard Parallel Mode
Onboard Parallel Port
Onboard Serial Port 1
Onboard Serial Port 2

ESC

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

PU/PD/+/­(Shift)F2

: Enabled
: SPP Mode
: 378H
: COM1
: COM2

: Select Item
: Modify
: Color

______________________________________________________________________

4-13

GA-486AS
______________________________________________________________________

• Cache Burst Read Cycle

Cache Burst Read Cycle can be set to 1 CCLK, 2 CCLK.
The default value is 1 CCLK.

2 CCLK
3 CCLK

For system speed ¡Ø 33 MHz.
For system speed ¡Ö 33 MHz.

• L2 Cache / DRAM Cycle WS

The default value is 2 CCLK.

2 CCLK
3 CCLK

For system speed ¡Ø 33 MHz.
For system speed ¡Ö 33 MHz.

• DRAM Speed

The default value is Fastest.

SupFast When adaptec 3940 or PCI to PCI Bridge CARD installed.
Fastest
Faster

System speed ¡Ø 33 MHz.
System speed ¡Ö 33 MHz.

• CPU Internal Cache

This option is for Cyrix or P24T CPU only.
The default value is Write Thru.

Write Thru Using write through for the configuration of CPU internal cache.
Write Back Using write back for the configuration of CPU internal cache.

• Onboard FDD Controller

The default value is Enabled.

Enabled Enable Onboard FDD Controller.
Disabled Disable Onboard FDD Controller.

• Onboard Parallel Mode

The defaults value is SPP .

Disabled Disable onboard LPT port.
SPP Mode Using Parallel port as Standard Printer port.
EPP Mode Using Parallel port as Enhanced Parallel port.
ECP Mode Using Parallel port as Extended Capabilities port.

• Onboard Parallel Port

The defaults value is 378H.

378H Enable onboard LPT port and address is 378H.
278H Enable onboard LPT port and address is 278H.
NONE Disable onboard LPT port.

• Onboard Serial Port 1

The defaults value is COM1.

COM1 Enable onboard Serial port1 and address is 3F8H.
COM3 Enable onboard Serial port1 and address is 3E8H.
NONE Disable onboard Serial port1.

______________________________________________________________________

4-14

______________________________________________________________________

BIOS Configuration

• Onboard Serial Port 2

The defaults value is COM2.

COM2 Enable onboard Serial port2 and address is 2F8H.
COM4 Enable onboard Serial port2 and address is 2E8H.
NONE Disable onboard Serial port2.

4.8 POWER MANAGEMENT SETUP

ROM PCI/ISA BIOS ( 2A4IBG01 )
POWER MANAGEMENT SETUP

AWARD SOFTWARE, INC.

Power Management
PM Control by APM
Viode Off Method : Blank Screen
Network Card
HDD Off After
Suspend Mode
VGA Activity

: Enable
: No

: Not installed
: Disable
: 3 Min
: Enable

Monitor IRQ5
Monitor IRQ7
Monitor IRQ9
Monitor IRQ10
Monitor IRQ12

: EnableMonitor IRQ3
: Disable
: Disable
: Disable
: Disable
: Disable

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

PU/PD/+/­(Shift)F2

: Select ItemESC
: Modify
: Color

• Power Management

The default value is Enable.

Enable Enable Green function.
Disable Disable Green function.

¡°

Please disable Green Function for Non-S CPU in OS/2, Unix,

Window NT & Novell system. (For example AMD not Enhance
CPU.)

• PM Control by APM

The default value is No.

Yes BIOS will combine DOS 6.2 (power.exe) & Windows 3.1 (DOS with

No BIOS will not combine DOS 6.2 (power.exe) & Windows 3.1 (DOS

______________________________________________________________________

APM) to get into Green mode.
with APM) to get into Green mode.

4-15

GA-486AS
______________________________________________________________________

• Video Off Method

The default value is Blank Screen.

Blank Screen BIOS will only blank monitor when gets into Green
V/H SYNC + Blank BIOS will turn off H/V SYNC & blank monitor when gets

mode.
into Green mode for Green monitor power saving.

• Network Card

The default value is Not installed.

Installed Network Card Installed.
Not installed Network Card not Installed.

If you set "Network Card Installed" to "Yes", the JP4 Green LED will not be light
when system get into Green mode.

• HDD Off After

The default value is Disable.

Disable Disable HDD Power Down mode function.
1 - 15 Mins Enable HDD enter Power Down mode between 1 to 15 mins.
Suspend HDD power down when system get into suspend mode.

• Suspend Mode

The default value is 3 min.

Disable Disable Suspend mode.
10 sec - 40 min Enable Suspend mode.

• VGA Activity

The default value is Enable.

Enable Enable VGA Activity.
Disable Disable VGA Activity.

• Monitor IRQ#

Monitor IRQ status. The default value is Enable IRQ3.

Enable Enabled Monitor IRQ Action.
Disable Disabled Monitor IRQ Action.

______________________________________________________________________

4-16

______________________________________________________________________

BIOS Configuration

4.9 PCI / IDE CONFIGURATION SETUP

ROM PCI/ISA BIOS ( 2A4IBG01 )

PCI / IDE CONFIGURATION SETUP

AWARD SOFTWARE, INC.

Slot 1 Using INT# : AUTO
Slot 2 Using INT#
Slot 3 Using INT#
GA410 Using INTA# in : N/A
1st Available IRQ
2nd Available IRQ
3rd Available IRQ
4th Available IRQ
PCI IRQ Actived By : Edge
PCI IDE IRQ Map To

Primary IDE INT#

Secondary IDE INT#
CPU-> PCI Mem Post Write Buf : Enable
CPU-> PCI Memory Burstt Write
PCI Master Burst Read/Write

: AUTO
: AUTO

: 9
: 10
: 11
: 12

: PCI-AUTO
: A
: B

: Enable
: Enable

• SLOT # Using INT#

The default value is AUTO.

AUTO The BIOS auto detect the PCI device using INTA ~ D and auto set up a

available IRQ to let device use.

A ~ D For some not PCI specification compliant device, the user must set up

IRQ manually.

• GA410 Using INTA # in

The default value N/A.
The GA-410 NCR 810 PCI SCSI card has a Jumper to select the card to be

Primary or Secondary card. If the card is been set up to Primary then the user
must set up the selection correctly (and the INT#A must be used). If the card is
been set up to Secondary then the user only set up the above selections.

• Available IRQ

The default value is shown on the above table.
These available IRQs are Mapped to be PCI INT# by BIOS for PCI device

automatically. If some one IRQ is used by ISA device then the user must keep the
IRQ out of the available table.

Onboard 496B IDE Port
IDE 0 Master Mode
IDE 0 Salve Mode
IDE 1 Master Mode
IDE 1 Salve Mode
IDE Prefetch Read Buffer
IDE HDD Block Mode

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

PU/PD/+/­(Shift)F2

: Both
: Auto
: Auto
: Auto
: Auto
: Disable
: Disable

: Select ItemESC
: Modify
: Color

______________________________________________________________________

4-17

GA-486AS
______________________________________________________________________

• PCI IRQ Actived By

The default value is Edge.

Edge Normal Operation.
Level For some PCI SCSI or Lan device using same PCI INT.

• PCI IDE IRQ Map To

You will see this option if you Disable Onboard PCI/IDE.
The default value is PCI-AUTO.

PCI-AUTO Map PCI IDE IRQ to PCI slot automatically.
ISA Map PCI IDE IRQ to ISA slot.
PCI-SLOT1 Map PCI IDE IRQ to PCI slot1.
PCI-SLOT2 Map PCI IDE IRQ to PCI slot2.
PCI-SLOT3 Map PCI IDE IRQ to PCI slot3.

• Primary / Secondary IDE INT#

You will see this option if you set PCI IDE IRQ MAP TO PCI-slot1, PCI-slot2, PCI­slot3 or PCI-AUTO.

Set INT# for Primary / Secondary PCI IDE. The Default value is A / B.

A Set INTA for Primary / Secondary PCI IDE.
B Set INTB for Primary / Secondary PCI IDE.
C Set INTC for Primary / Secondary PCI IDE.
D Set INTD for Primary / Secondary PCI IDE.

• CPU¡÷PCI Mem Post Write Buf

The default value is Enable.

Enable
Disable

Enable CPU¡÷PCI Mem Post Write Buf.
Disable CPU¡÷PCI Mem Post Write Buf.

• CPU¡÷PCI Memory Burst Write

The default value is Enable.

Enable
Disable

Enable CPU¡÷PCI Memory Burst Write function.
Disable CPU¡÷PCI Memory Burst Write function .

• PCI Master Burst Read / Write

The default value is Enable.

Enable Enable PCI Master Burst Read/Write function.
Disable Disable PCI Master Burst Read/Write function.

• Onboard 496B IDE Port

The default value is Both.

Both Enable both Primary and Secondary IDE Function onboard.
Primary Enable only Primary IDE Function onboard.
Secondary Enable only Secondary IDE Function onboard.
Disable Disable onboard PCI IDE Function.

______________________________________________________________________

4-18

______________________________________________________________________

BIOS Configuration

• IDE 0/1 Master / Slavve Mode

The default value is Auto.

Auto BIOS detect HDD mode Automatically.
0 - 4 Set HDD Maunally.

• IDE Prefetch Read Buffer

The default value is Disable.

Disable Disable IDE Prefetch Read Buffer.
Enable Enable IDE Prefetch Read Buffer.

• IDE HDD Block Mode

The default value is Disable.

Disable Disable IDE HDD Block Mode.
Enable Enable IDE HDD Block Mode.

4.10LOAD BIOS DEFAULTS

ROM PCI/ISA BIOS ( 2A4IBG01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

Load BIOS Defaults (Y/N)? N

PCI/IDE CONFIGURATION SETUP

LOAD BIOS DEFAULTS

LOAD SETUP DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Load BIOS Defaults except Standard CMOS SETUP

PASSWORD SETTING

IDE HDD AUTO DETECTION

HDD LOW LEVEL FORMAT

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

: Select Item
: Change Color

• Load BIOS Defaults

To load BIOS defaults value to CMOS SRAM, enter "Y". If not, enter "N".

______________________________________________________________________

4-19

GA-486AS
______________________________________________________________________

4.11LOAD SETUP DEFAULTS

ROM PCI/ISA BIOS ( 2A4IBG01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

Load SETUP Defaults (Y/N)? N

PCI/IDE CONFIGURATION SETUP

LOAD BIOS DEFAULTS

LOAD SETUP DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Load SETUP Defaults except Standard CMOS SETUP

PASSWORD SETTING

IDE HDD AUTO DETECTION

HDD LOW LEVEL FORMAT

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

: Select Item
: Change Color

• Load Setup Defaults

To load Setup defaults value to CMOS SRAM, enter "Y". If not, enter "N".

______________________________________________________________________

4-20

______________________________________________________________________

BIOS Configuration

4.12PASSWORD SETTING

PASSWORD SETTING
When you select this function, the following message will appear at the center of the

screen to assist you in creating a password.

ROM PCI/ISA BIOS ( 2A4IBG01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

Enter Password:

PCI/IDE CONFIGURATION SETUP

LOAD BIOS DEFAULTS

LOAD SETUP DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Change / Set / Disable Password

PASSWORD SETTING

IDE HDD AUTO DETECTION

HDD LOW LEVEL FORMAT

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

: Select Item
: Change Color

Type the password, up to eight characters, and press <Enter>. The password typed
now will clear and previously entered password from CMOS memory. You will be asked
to confirm the password. Type the password again and press <Enter>. You may also
press <Esc> to abort the selection and not to enter a password.

To disable password, just press <Enter> when you are prompted to enter password. A
message will confirm the password being disabled. Once the password is disabled, the
system will boot and you can enter Setup freely.

PASSWORD DISABLED
If you select System at Security Option of BIOS Features Setup Menu, you will be

prompted for the password every time the system is rebooted or any time you try to
enter Setup. If you select Setup at Security Option of BIOS Features Setup Menu, you
will be prompted only when you try to enter Setup.

______________________________________________________________________

4-21

GA-486AS
______________________________________________________________________

4.13IDE HDD AUTO DETECTION

ROM PCI/ ISA BIOS ( 2A4IBG01 )

STANDARD CMOS SETUP

AWARD SOFTWARE, INC.

HARD DISKS TYPE SIZE

Primary Master::

OPTIONS SIZE CYLS HEAD PRECOMP LANDZ SECTOR MODE

2(Y)3539 523
1

1046 16

539
539 523

CYLS HEAD PRECOMP LANDZ SECTOR MODE

Select Primary Master Option ( N=Skip ): N

32

32

0 63
65535
65535

ESC : Skip

1045
1045
1045

6363NORMAL

LAB

LARGE

Type "Y" will accept the H.D.D. parameter reported by BIOS. Type "N" will keep the old
H.D.D. parameter setup. If the hard disk cylinder NO. is over 1024, then the user can
select LBA mode or LARGER mode for DOS partition LARGE than 528 MB.

______________________________________________________________________

4-22

______________________________________________________________________

BIOS Configuration

4.14HDD LOW LEVEL FORMAT

ROM PCI/ISA BIOS ( 2A4IBG01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

PCI/IDE CONFIGURATION SETUP

LOAD BIOS DEFAULTS

LOAD SETUP DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Hard disk low level format utility

This utility can low level format HDD.

PASSWORD SETTING

IDE HDD AUTO DETECTION

HDD LOW LEVEL FORMAT

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

: Select Item
: Change Color

______________________________________________________________________

4-23

GA-486AS
______________________________________________________________________

4.15SAVE & EXIT SETUP

ROM PCI/ISA BIOS ( 2A4IBG01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

SAVE to CMOS and EXIT (Y/N) ? N

PCI/IDE CONFIGURATION SETUP

LOAD BIOS DEFAULTS

LOAD SETUP DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Save Data CMOS & Exit SETUP

PASSWORD SETTING

IDE HDD AUTO DETECTION

HDD LOW LEVEL FORMAT

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

: Select Item
: Change Color

Type "Y" will quit the Setup Utility and save the user setup value to RTC CMOS SRAM.
Type "N" will return to Setup Utility.

______________________________________________________________________

4-24

______________________________________________________________________

BIOS Configuration

4.16EXIT WITHOUT SAVING

ROM PCI/ISA BIOS ( 2A4IBG01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

Quit Without Saving (Y/N) ? N

PCI/IDE CONFIGURATION SETUP

LOAD BIOS DEFAULTS

LOAD SETUP DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Abandon all Datas & Exit SETUP

PASSWORD SETTING

IDE HDD AUTO DETECTION

HDD LOW LEVEL FORMAT

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

: Select Item
: Change Color

Type "Y" will quit the Setup Utility without saving to RTC CMOS SRAM. Type "N" will
return to Setup Utility.

4.17KEYBOARD SETTING FUNCTION

After booting the O.S., there are some special functions used by keyboard as follows:

"CTRL_ALT_DEL" Pressing these keys simultaneously will cause system a
"CTRL_ALT_[+]" If short J3 pin1 & 2, pressing these keys simultaneously will

"CTRL_ALT_[-]" If short J3 pin1 & 2, pressing these keys simultaneously will

WARM START (Soft Reset).
change the system speed to high speed (TURBO, all cache

memory enabled).
change the system speed to low speed (Normal, disable

cache memory).

______________________________________________________________________

4-25

GA-486AS
______________________________________________________________________

5 AT TECHNICAL INFORMATION

5.1 BUS CONNECTOR PIN OUT

5.1.1ISA BUS SLOT PIN OUT

B01

A01

-I/O CH CHKGND

B02

A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
A28
A29
A30
A31

SD07
SD06
SD05
SD04
SD03
SD02
SD01
SD00

-I/O CH RDY
AEN
SA19
SA18
SA17
SA16
SA15
SA14
SA13
SA12
SA11
SA10
SA09
SA08
SA07
SA06
SA05
SA04
SA03
SA02
SA01
SA00

-MEMCS16

-I/OCS16
IRQ10
IRQ11
IRQ12
IRQ15
IRQ14

-DACK0
DRQ0

-DACK5
DRQ5

-DACK6
DRQ6

-DACK7
DRQ7

+5V

-MASTER
GND

D01
D02
D03
D04
D05
D06
D07
D08
D09
D10
D11
D12
D13
D14
D15
D16
D17
D18

C01
C02
C03
C04
C05
C06
C07
C08
C09
C10
C11
C12
C13
C14
C15
C16
C17
C18

SBHE
LA23
LA22
LA21
LA20
LA19
LA18
LA17

-MEMR

-MEMW
SD08
SD09
SD10
SD11
SD12
SD13
SD14
SD15

RESET

+5V

IRQ9

-5V

DRQ2

-12V
0WS

+12V

GND

-SMEMW

-SMEMR

-IOW

-IOR

-DACK3

-DRQ3

-DACK1

-DRQ1

-REFRESH
BCLK

IRQ7
IRQ6
IRQ5
IRQ4
IRQ3

-DACK2
T/C

BALE

+5V
OSC

GND

B03
B04
B05
B06
B07
B08
B09
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27
B28
B29
B30
B31

______________________________________________________________________

5-1

______________________________________________________________________

AT Technical Information

5.1.2PCI BUS SLOT PIN OUT

B01

A01
A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
A28
A29
A30
A31
A32
A33
A34
A35
A36
A37
A38
A39
A40
A41
A42
A43
A44
A45
A46
A47
A48
A49

NC
+12V
NC
NC
VCC
INTA#
INTC#
VCC
NC
VCC
NC
GND
GND
NC
RST#
VCC
GNT#
GND
NC
AD_30
NC
AD_28
AD_26
GND
AD_24
IDSEL
NC
AD_22
AD_20
GND
AD_18
AD_16
NC
FRAME#
GND
TRDY#
GND
STOP#
NC
SDONE
SBO#
GND
PAR
AD_15
NC
AD_13
AD_11
GND
AD_09

AD_08
AD_07

AD_05
AD_03

GND

AD_01

VCC

VCC
VCC

B52

A52
A53
A54
A55
A56
A57
A58
A59
A60
A61

CBE#0
NC
AD_06
AD_04
GND
AD_02
AD_00
VCC
NC
VCC
VCC

B53
B54

NC

B55
B56
B57
B58
B59
B60

NC

B61
B62 A62

INTB#
INTD#

PST#1

PST#2

REQ#

AD_31
AD_29

AD_27
AD_25

CBE#3
AD_23

AD_21
AD_19

AD_17
CEB#2

IRDY#

DEVSEL#

LOCK#

PERR#

SERR#

CBE#1
AD_14

AD_12
AD_10

-12V

GND

VCC
VCC

GND
GND

GND

CLK

GND

VCC

GND

GND

GND

GND

GND

GND

B02

NC

B03
B04

NC

B05
B06
B07
B08
B09
B10

NC

B11
B12
B13
B14

NC

B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25

NC

B26
B27
B28
B29
B30
B31

NC

B32
B33
B34
B35
B36

NC

B37
B38
B39
B40
B41

NC

B42
B43

NC

B44
B45
B46
B47
B48
B49

______________________________________________________________________
5-2

GA-486AS

MEMORY MAP:

009FFFF]

00BFFFF]

Reserved for I/O device BIOS ROM or RAM buffer.

00EFFFF]

00FFFFF]

[000-01F]

[040-05F]

[060-06F]

[080-09F]

[0A0-0BF]

[0F0-0FF]

[1F0-1F8]

[2B0-2DF]

[2F8-2FF]

[378-37F]

[3B0-3BF]

[3D0-3DF]

[3F0-3F7]

______________________________________________________________________

5.2 I/O & MEMORY MAP

[0000000­[00A0000­[00C0000-

00DFFFF]
[00E0000-

System memory used by DOS and application
program.
Display buffer memory for
VGA/EGA/CGA/MONOCHROME adapter.

Reserved for PCI device ROM.
[00F0000­[0100000-

BFFFFFF]

I/O MAP:

[070-07F] RTC ports & CMOS I/O ports.

[0C0-0DF] DMA controller.(Slave)

[278-27F] PARALLEL port-2.

[360-36F] NETWORK ports.

[3C0-3CF] EGA adapter.

[3F8-3FF] SERIAL port-1.

System BIOS ROM.

System extension memory.

DMA controller.(Master)

INTERRUPT controller.(Master)

CHIPSET control registers I/O ports.

TIMER control registers.

KEYBOARD interface controller.(8042)

DMA register.

INTERRUPT controller.(Slave)

MATH COPROCESSOR

HARD DISK controller.

GRAPHICS adapter controller.

SERIAL port-2.

PARALLEL port-1

MONOCHROME & PRINTER adapter.

CGA adapter.

FLOPPY DISK controller.

5.3 TIMER & DMA CHANNELS MAP

TIMER MAP: TIMER Channel-0 System timer interrupt

DMA CHANNELS: DMA Channel-0 Available

TIMER Channel-1 DRAM REFRESH request
TIMER Channel-2 SPEAKER tone generator

DMA Channel-1 IBM SDLC
DMA Channel-2 FLOPPY DISK adapter
DMA Channel-3 Available
DMA Channel-4 Cascade for DMA controller 1
DMA Channel-5 Available
DMA Channel-6 Available
DMA Channel-7 Available

______________________________________________________________________

5-3

______________________________________________________________________

AT Technical Information

5.4 INTERRUPT MAP

NMI: Parity check error
IRQ (H/W): System TIMER interrupt from TIMER-0

KEYBOARD output buffer full
Cascade for IRQ 8-15
SERIAL port 2
SERIAL port 1
PARALLEL port 2
FLOPPY DISK adapter
PARALLEL port 1
RTC clock
Available
Available
Available
Available
MATH coprocessor
HARD DISK adapter
Available

5.5 RTC & CMOS RAM MAP

RTC & CMOS: Seconds

0A Status register A
0B Status register B
0C Status register C
0D Status register D
0E Diagnostic status byte
0F Shutdown byte

19-2d
2E-2F

34-3F Reserve
40-7f Reserved for CHIPSET SETTING DATA

Second alarm

Minutes

Minutes alarm

Hours

Hours alarm

Day of week

Day of month

Month

Year

FLOPPY DISK drive type byte

Reserve

HARD DISK type byte

Reserve

Equipment byte

Base memory low byte

Base memory high byte

Extension memory low byte

Extension memory high byte

Reserved for extension memory low byte

Reserved for extension memory high byte

DATE CENTURY byte

INFORMATION FLAG

______________________________________________________________________
5-4

GA-486AS
______________________________________________________________________

APPENDIX A: POST MESSAGE

When the BIOS encounters an error that requires the user to correct something, either a
beep code will sound or a message will be displayed in a box in the middle of the screen
and the message PRESS F1 TO CONTINUE, CTRL-ALT-ESC OR DEL TO ENTER
SETUP will be shown in the information box at the bottom.

• POST BEEP

Currently there is only one beep code in BIOS. This code indicates that a video
error has occurred and the BIOS cannot initialize the video screen to display any
additional information. This beep code consists of a single long beep followed by
two short beeps.

• ERROR MESSAGE

Once or more of the following messages may be displayed if the BIOS detects an
error during the POST. This list includes message for both the ISA and the EISA
BIOS.

Ö CMOS BATTERY HAS FAILED

CMOS battery is no longer functional. It should be replaced.

Ö CMOS CHECKSUM ERROR

Checksum of CMOS is incorrect. This can indicate that CMOS has been corrupted.
This error may have been caused by a weak battery. Check the battery and replace
it if necessary.

Ö DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER

No boot device was found. Insert a system disk into Drive A: and press <Enter>. If
you assumed the system would boot from the hard drive, make sure the controller is
inserted correctly and all cables are properly attached. Also be sure the disk is
formatted as a boot device. Then reboot the system.

Ö DISKETTE DRIVES OR TYPES MISMATCH ERROR - RUN SETUP

Type of diskette drive installed in the system is different from the CMOS definition.
Run Setup to re-configure the drive type correctly.

Ö DISPLAY SWITCH IS SET INCORRECTLY

Display switch on the motherboard can be set to either monochrome or color. This
indicates the switch is set to a different setting than indicated in Setup. Determine
which setting is correct, and then either turn off the system and change the jumper,
or enter Setup and change the VIDEO selection.

Ö DISPLAY TYPE HAS CHANGED SINCE LAST BOOT

Since last powering off the system, the display adapter has been changed. You
must configure the system for the new display type.

Ö ERROR ENCOUNTERED INITIALIZING HARD DRIVE

Hard drive cannot be initialized. Be sure the adapter is installed correctly and all
cables are correctly and firmly attached. Also be sure the correct hard drive type is
selected in Setup.

______________________________________________________________________

A-1

______________________________________________________________________

Appendix A: Post Message

Ö ERROR INITIALIZING HARD DISK CONTROLLER

Cannot initialize controller. Make sure the cord is correctly and firmly installed in the
bus. Be sure the correct hard drive type is selected in Setup. Also check to see if
any jumper needs to be set correctly in the hard drive.

Ö FLOPPY DISK CNTRLR ERROR OR NO CNTRLR PRESENT

Cannot find or initialize the floppy drive controller. Make sure the controller is
installed correctly and firmly. If there is no floppy drive installed, be sure the Diskette
Drive selection in Setup is set to NONE.

Ö KEYBOARD ERROR OR NO KEYBOARD PRESENT

Cannot initialize the keyboard. Make sure the keyboard is attached correctly and no
keys are being pressed during the boot.

If you are purposely configuring the system without a keyboard, set the error halt
condition in Setup to HALT ON ALL, BUT KEYBOARD. This will cause the BIOS to
ignore the missing keyboard and continue the boot.

Ö Memory Address Error at ...

Indicates a memory address error at a specific location. You can use this location
along with the memory map for your system to find and replace the bad memory
chips.

Ö MEMORY SIZE HAS CHANGED SINCE LAST BOOT

Memory has been added or removed since the last boot. In EISA mode use
Configuration Utility to re-configure the memory configuration. In ISA mode enter
Setup and enter the new memory size in the memory fields.

Ö Memory Verify Error at ...

Indicate an error verifying a value already written to memory. Use the location along
with your system memory map to locate the bad chip.

Ö OFFENDING ADDRESS NOT FOUND

This message is used in conjunction with the I/O CHANNEL CHECK and RAM
PARITY ERROR messages when the segment with problem cannot be isolated.

Ö OFFENDING SEGMENT:

This message is used in conjunction with the I/O CHANNEL CHECK and RAM
PARITY ERROR messages when the segment with problem has been isolated.

Ö PRESS A KEY TO REBOOT

This will be displayed at the bottom screen when an error occurs that requires you
to reboot. Press any key and the system will reboot.

Ö PRESS F1 TO DISABLE NMI, F2 TO REBOOT

When BIOS detects a Non-maskable Interrupt condition during boot, this will allow
you to disable the NMI and continue to boot, or you can reboot the system will the
NMI enabled.

Ö SYSTEM HALTED, (CTRL-ALT-DEL) TO REBOOT ...

Indicates the present boot attempt has been aborted and the system must be
rebooted. Press and hold down the CTRL and ALT keys and press DEL.

______________________________________________________________________
A-2

GA-486AS
______________________________________________________________________

APPENDIX B: POST CODES

F ISA POST codes are typically output to port address 80h.

POST Name Description
C0 Turn Off Chipset Cache OEM Specific-Cache control.
1 Processor Test 1 Processor Status (1 FLAGS) Verification.

2 Processor Test 2 Read/Write/Verify all CPU registers except SS, SP, and
3 Initialize Chips Disable NMI, PIE, AIE, UEI, SQWV.

4 Test Memory Refresh

5 Blank video, Initialize
6 Reserved

7 Test CMOS Interface
BE Chipset Default
C1 Memory presence test OEM Specific-Test to size on-board memory.

C5 Early Shadow OEM Specific-Early Shadow enable for fast boot.
C6 Cache presence test External cache size detection.
8 Setup low memory Early chip set initialization.

9 Early Cache
A Setup Interrupt Vector
B Test CMOS RAM
C Initialize keyboard Detect type of keyboard controller (optional).
D Initialize Video

E Test Video Memory Test video memory, write sign-on message to screen.
F Test DMA Controller 0 BIOS checksum test.
10 Test DMA Controller 1

Toggle

keyboard

and Battery Status
Initialization

Initialization
Table
Checksum

Interface

______________________________________________________________________

Test the following processor status flags
carry, zero, sign, overflow,
The BIOS will set each of these flags, verify they are set,
then turn each flag off and verify it is off.

BP with data pattern FF and 00.
Disable video, parity checking, DMA.

Reset math coprocessor.
Clear all page registers, CMOS shutdown byte.
Initialize timer 0, 1, and 2, including set EISA timer to a
known state.
Initialize DMA controllers 0 and 1.
Initialize interrupt controllers 0 and 1.
Initialize EISA extended registers.
RAM must be periodically refreshed in order to keep the
memory from decaying. This function assures that the
memory refresh function is working properly.
Keyboard controller initialization.

Verifies CMOS is working correctly, detects bad battery.
Program chipset registers with power on BIOS defaults.

Memory presence test.
OEM chip set routines.
Clear low 64 K of memory.
Test first 64 K memory.
Cyrix CPU initialization.
Cache initialization.
Initialize first 120 interrupt vectors with SPURIOUS_INT­HDLR and initialize INT 00h-1Fh according to INT_TBL.
Test CMOS RAM Checksum, if bad, or insert key
pressed, load defaults.

Set NUM_LOCK status.
Detect CPU clock.
Read CMOS location 14h to find out type of video in use.
Detect and Initialize Video Adapter.

Setup shadow RAM - Enable shadow according to Setup.
Keyboard detect and initialization.

B-1

______________________________________________________________________

Appendix B:Post Codes

11 Test DMA Page
12-13 Reserved

14 Test Timer Counter 2 Test 8254 Timer 0 Counter 2.
15 Test 8259-1 Mask Bits Verify 8259 Channel 1 masked interrupts by alternative

16 Test 8259-2 Mask Bits Verify 8259 Channel 2 masked interrupts by alternative
17 Test Stuck 8259's
18 Test 8259 Interrupt
19 Test Stuck NMI Bits
1A Display CPU clock.

1B-1E Reserved
20 Enable Slot 0 Initialize slot 0 (System Board).
21-2F Enable Slots 1-15 Initialize slot 1 through 15.
30 Size Base and

31 Test Base and

33-3B Reserved
3C Setup Enabled
3D Initialize & Install

3E Setup Cache Controller Initialize cache controller.
3F Reserved
BF Chipset Initialization Program chipset registers with Setup values.
40 Display virus protest disable or enable.
41 Initialize Floppy Drive &

42 Initialize Hard Drive &
43 Detect & Initialize
44 Reserved

45 Detect & Initialize Math
46 Reserved

47 Reserved
48-4D Reserved
4E Manufacturing POST

4F Security Check Ask password security (optional).
50 Write CMOS Write all CMOS values back to RAM and clear screen.
51 Pre-boot Enable Enable parity checker.

52 Initialize Option ROMs Initialize any option ROMs present from C8000h to

registers

Interrupt Bits
Functionality
(Parity/IO Check)

Extended Memory
Extended Memory

Mouse

Controller
Controller
Serial/Parallel Ports

Coprocessor

Loop or Display
Messages

Test DMA Page Registers.

turning off and on the interrupt lines.
turning off and on the interrupt lines.

Turn off interrupts then verify no interrupt mask register is
on.
Force an interrupt and verify the interrupt occurred.

Verify NMI can be cleared.

Size base memory from 256 K to 640 K extended memory
above 1 MB.
Test base memory from 256 K to 640 K and extended
memory above 1 MB using various patterns.
This will be skipped in EISA mode and can be "skipped"
with ESC key in ISA mode.

Detect if mouse is present, initialize mouse, install
interrupt vectors.

Initialize floppy disk drive controller and any drives.
Initialize hard drive controller and any drives.
Initialize any serial and parallel ports (also game port).

Initialize math coprocessor.

Reboot if Manufacturing POST Loop pin is set. Otherwise
display any messages (i.e., any non-fatal errors that were
detected during POST) and enter Setup.

Enable NMI, Enable cache before boot.
EFFFFh.

When FSCAN option is enabled, will initialize from
C8000h to F7FFFh.

______________________________________________________________________
B-2

GA-486AS
______________________________________________________________________

53 Initialize Time Value Initialize time value in 40h: BIOS area.
60 Setup Virus Protect Setup virus protect according to Setup
61 Set Boot Speed Set system speed for boot
62 Setup NumLock Setup NumLock status according to Setup
63 Boot Attempt Set low stack.

B0 Spurious If interrupt occurs in protected mode.
B1 Unclaimed NMI If unmasked NMI occurs, display

E1-EF Setup Pages E1 - Page 1, E2 - Page 2, etc.
FF Boot

Boot via INT 19h.

Press F1 to disable NMI, F2 reboot.

______________________________________________________________________

B-3

______________________________________________________________________

Appendix C: Default Drive Table

APPENDIX C: BIOS DEFAULT DRIVE TABLE

Type Size (MB) Cylinders Heads Write/ Precomp Land Zone Sectors

1 10 306 4 128 305 17
2 21 615 4 300 615 17
3 32 615 6 300 615 17
4 65 940 8 512 940 17
5 49 940 6 512 940 17
6 21 615 4 65535 615 17
7 32 462 8 256 511 17
8 31 733 5 65535 733 17

9 117 900 15 65535 901 17
10 21 820 3 65535 820 17
11 37 855 5 65535 855 17
12 52 855 7 65535 855 17
13 21 306 8 128 319 17
14 44 733 7 65535 733 17
16 21 612 4 0 663 17
17 42 977 5 300 977 17
18 59 977 7 65535 977 17
19 62 1024 7 512 1023 17
20 31 733 5 300 732 17
21 44 733 7 300 732 17
22 31 733 5 300 732 17
23 10 306 4 0 336 17
24 42 977 5 65535 976 17
25 80 1024 9 65535 1023 17
26 74 1224 7 65535 1223 17
27 117 1224 11 65535 1223 17
28 159 1224 15 65535 1223 17
29 71 1024 8 65535 1023 17
30 98 1024 11 65535 1023 17
31 87 918 11 65535 1023 17
32 72 925 9 65535 926 17
33 89 1024 10 65535 1023 17
34 106 1024 12 65535 1023 17
35 115 1024 13 65535 1023 17
36 124 1024 14 65535 1023 17
37 17 1024 2 65535 1023 17
38 142 1024 16 65535 1023 17
39 119 918 15 65535 1023 17
40 42 820 6 65535 820 17
41 44 1024 5 65535 1023 17
42 68 1024 5 65535 1023 17
43 42 809 6 65535 852 17
44 64 809 6 65535 852 26
45 104 776 8 65535 775 33

User

______________________________________________________________________

C-1

GA-486AS

q

512 KB

______________________________________________________________________

APPENDIX D: PROBLEM SHEET

1. Customer Data

Name
Address

2. Mainboard Date

Model NO.
Serial No.

3. System Configuration

CPU Type:
CPU Brand:
CPU Speed:
DRAM Type:
DRAM Speed:
DRAM Total Size:
DRAM Brand:
SRAM Size:
SRAM Part No.
Video Card:
Video Chip or Brand:
Floppy Drive A Capacity & Brand:
Floppy Drive B Capacity & Brand:
Storage Controller Type
Hard Drive C Brand & Type:
Hard Drive D Brand & Type:
LAN Controller Type:
LAN Card Brand & Model:
Serial / Parallel Chip Brand & Model:
Mouse Brand & Model:
O.S.

4. AUTOEXEC.BAT & CONFIG.SYS File:

GA- Rev. No.

q 1 q 2 q 4 q 8 q 16 q 32 MB
q 80 q 70 q 60 ns

q 64KB q 128 KB q 256 KB

TAG: DATA:

q DOS q OS/2 q NETWARE q UNIX / XENIX Ver.:

MB

q MFM q RLL q IDE q ESDI q SCSI

Tel. No.
Fax. No.
Purchase Date

q 1 MB

5. Problem Description:

______________________________________________________________________

D-1