Gigabyte GA-486AM User Manual

GA - 486AM

USER'S MANUAL

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

Rev. 1 First Edition

GA-486AM

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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.
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......................................................................................1-1

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

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

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

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......................................................................................3-1

3.3.JUMPERS AND CONNECTORS SETTING..................................................... 3-4

3.4.SRAM INSTALLATION AND JUMPERS SETUP ............................................. 3-5

3.5.CPU INSTALLATION AND JUMPERS SETUP................................................ 3-5

3.6.DRAM INSTALLATION...................................................................................... 3-7

3.7.SPEAKER CONNECTOR INSTALLATION ...................................................... 3-7

3.8.POWER LED & KEY LOCK CONNECTOR INSTALLATION .......................... 3-7

3.9.TURBO SWITCH CONNECTOR INSTALLATION........................................... 3-7

3.10.TURBO LED FLASH GREEN LED CONNECTOR INSTALLATION..............3-7

3.11.HARDWARE RESET SWITCH CONNECTOR INSTALLATION................... 3-8

3.12.GREEN FUNCTION INSTALLATION.............................................................. 3-8

3.13.PERIPHERAL DEVICE INSTALLATION.........................................................3-8

3.14.SOME IMPORTANT APPLICATION NOTES ................................................. 3-8

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.....................................................................4-13

4.9.PCI /GREEN FUNCTION SETUP..................................................................... 4-15

4.10.LOAD BIOS DEFAULTS.................................................................................. 4-17

4.11.LOAD SETUP DEFAULTS...............................................................................4-18

4.12.PASSWORD SETTING...................................................................................4-19

4.13.IDE HDD AUTO DETECTION.........................................................................4-20

4.14.SAVE & EXIT SETUP ...................................................................................... 4-21

4.15.EXIT WITHOUT SAVING ................................................................................ 4-22

4.16.KEYBOARD SETTING FUNCTION.................................................................4-22

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

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GA-486AM

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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-486AM 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) had been added. 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 486DX / DX2 / SX / S-Series / OverDrive / P24D / P24T / DX4 running at 25 -

100 MHz.

• Supports True Green Function.

• Supports Intel, AMD, Cyrix and UMC CPU.

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

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

• Write-Back cache operation.

• Supports 2 - 128 MB DRAM memory on board.

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

• Supports 2xCOM (16550) ports, 1xLPT (EEP / ECP) port, 1 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 .

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.)

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GA-486AM

•

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• CPU : 486DX4-100/75,DX2-80/66/50,DX-40/33/P24T 63 • Config.sys: • Autoexec.bat:

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

CACHE : 256KB DEVICE = Using Default Setting @ECHO OFF

• VGA : Genoa S3/864 2MB DRAM DEVICE = C:\DOS\HIMEM.SYS PROMPT $p$g

• H.D. : Seagate ST31220A ( 1GB ) DOS = HIGH PATH C:\;C:\DOS

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

System Benchmarks At DOS Environment with IDE Controller

¡° Using Intel DX4-100 / 75

Software Item Unit P24T 63WBDX4-100x3 DX4-75x3 DX2-80

LandMark Speed CPU MHz 360.77 363.39 272.57 267.74
V2.0 FPU MHz 1038.62 883.65 662.79 704.77

Norton SI CPU index 198.1 198.1 148.6 158.5
V8.0 DISK index 19.3 19.3 19.3 17.0

Power Meter MIPS Mips 28.7 29.6 22.2 23.5
V1.81 CPU/MEM Agg. PMUs 44895.7 39237.0 29466.0 31067.3

PC Bench mark DOS Mark index 593.41 605.45 494.76 485.98
V9.0 CPU mark 16 index 116.02 113.52 86.91 86.21

Software Item Unit DX2-66 DX2-50 DX-40 DX-33
LandMark Speed CPU MHz 223.08 167.43 133.87 111.53
V2.0 FPU MHz 589.08 441.38 353.49 294.52

Norton SI CPU index 144.1 108.1 86.4 72.0
V8.0 DISK index 19.4 19.3 16.8 19.3

Power Meter MIPS Mips 21.2 15.9 13.0 10.9
V1.81 CPU/MEM Agg. PMUs 25764.7 19428.7 15604.0 13009.0

PC Bench mark DOS Mark index 478.69 384.52 336.45 304.09
V9.0 CPU mark 16 index 84.07 63.85 53.91 47.17

Video chr/ms 12288 16384 12288 12603

Overall index 137.3 138.4 105.4 111.2

Data-Xfer KB/sec 8058.5 8058.5 8058.5 8058.5
DISK Agg. PMUs 1183.6 1281.4 1284.5 1284.5

Video Score index 3350.31 4334.13 3482.11 3469.10
DISK Score index 391.29 393.86 345.22 334.53

Video chr/ms 16384 1228 12603 16384

Overall index 102.4 78.4 63.2 54.4

Data-Xfer KB/sec 8058.5 8058.5 8058.5 8058.5
DISK Agg. PMUs 1284.5 1284.7 1286.2 1288.5

Video Score index 4309.58 3462.69 3439.79 4251.11
DISK Score index 319.19 272.82 244.17 220.67

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1-2

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Introduction

1.4 BLOCK DIAGRAM

SD<0..15>

80486

UM8881F

SA<0..15>

8 MHz

AT Bus

OSC

Cache SRAM

Clock Buffer

MA,RAS,CAS

Clock Buffer

1 2

UM8886AF

Memory DRAM

PCI Bus

BIOS ROM

CTRL
Buffer

DATA
Buffer

IDE

1.5 INTRODUCE THE PCI-BUS

Connecting devices to a local bus of CPU can dramatically increase the speed of I/O-bound
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 bandwidth­constrained 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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GA-486AM
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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 / 40 / 50 MHz system

− 20-33 MHz PCI- bus speed.

− 8 MHz (programmable) AT Bus speed.

− Hardware and Software speed switchable function.

• GREEN FUNCTION − Power Down Timer from 0.25 min to 512 min.

− When enter Power Down Mode, 8 MHz system speed for

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

− 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 − 2 banks 72 pins SIMM module sockets on board.

− Use 1 / 2 / 4 / 8 / 16 / 32 MB 70 ns SIMM module DRAM.

− 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.

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

− Support 486 Burst mode on 2nd cache memory access.

• 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 3 IDE & ATAPI CD-ROM.

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

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

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

− Supports 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.

− 0°C to +50°C (operating).

• RELATIVE HUM. − 0 to +85% (operating).

• ALTITUDE − 0 to 10,000 feet (operating).

• VIBRATION − 0 to 1,000 Hz.

• ELECTRICITY − 4.9 V to 5.2 V.

− 3 A to 5 A current.

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GA-486AM

J2

2

J3

JP12

JP8

1

4

1

2

JP11

111111111

1

J1

3

1

2

1

2

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3 HARDWARE INSTALLATION

3.1 UNPACKING

The ainboard ackage hould ontain he ollowing:

• The A-486AM 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.

3.2 MAINBOARD LAYOUT

×GA-486AMØ

+++

+

J

J

J

J

J4

P

P

P

P

R

R

R

R

N

N

N

N

2

3

4

5

JP5

JP9

CPU

JP24

JP22

JP26

JP23

U28 U27

U30

U32

U34

R
N
1

314

5
6
5
6

CN1 IDE1
CN2 IDE2

BIOS

271024

DS12887

JP10

3

JP20

4
3

TAG RAM

4

D
A
T
A

U29

C

U31

A
C

U33

H
E

SLOT 2

SLOT 4

SLOT 6

SLOT 8 SLOT 7

JP14

1

5

3

JP15

4

612

GA-486AM

82C8881

JP13

PCI 3 SUGGEST DISPLAY

PCI 2

PCI 1

SLOT 1

SLOT 3

SLOT 5

82C8886AF

SIMM 1
SIMM 2
SIMM 3
SIMM 4

FLOPPY CN3

CN6
9

COM1/3 COM2/4

10

JP18JP19

PRINT PORT CN4

129

10

+

JP25

GN PW

1
1
1
1

PS1

CN5

UM8663

1

2

KB1

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3-1

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INTEL SX-25/SX2-50 O X X X O X X O X O O X
INTEL SX-25/SX2-50 S-CPU O X X X O X X O X O O X
INTEL DX-25/DX2-50 O X X X O X X O X O O X
INTEL DX-25/DX2-50 S-CPU O X X X O X X O X O O X
INTEL P24T 63 WT O X X X O X X O X O O X
INTEL P24T 63 WB O X X X O X X O X O O X
INTEL DX4-75(25x3) S-CPU O X X X O X X O X O O X
INTEL SX-33/SX2-66 O O O X O X X O X O O X
INTEL SX-33/SX2-66 S-CPU O O O X O X X O X O O X
INTEL DX-33/DX2-66 O O O X O X X O X O O X
INTEL DX-33/DX2-66 S-CPU O O O X O X X O X O O X
INTEL P24T 83 WT O O O X O X X O X O O X
INTEL P24T 83 WB O O O X O X X O X O O X
INTEL DX-33 OVERDRIVE O O O X O X X O X O O X
INTEL DX-33 OVERDRIVE S-CPU O O O X O X X O X O O X
INTEL P24D WT S-CPU O O O X O X X O X O O X
INTEL P24D WB S-CPU O O O X O X X O X O O X
AMD Enhance DX2-66 WT O O O X O X X O X O O X
AMD Enhance DX2-66 WB O O O X O X X O X O O X
INTEL DX4-100(33X3) S-CPU O O O X O X X O X O O X
AMD Enhance DX4-100 WT O O O X O X X O X O O X
AMD Enhance DX4-100 WB O O O X O X X O X O O X
INTEL DX4-OVERDRIVE(33X3) S-CPU O O O X O X X O X O O X
INTEL DX4-100(50X2) S-CPU NOT-RECOMMEND X X O X O X X O X O O X
AMD SX-25/SX2-50 O X X X O X X O X O O X
AMD DX-25/DX2-50 O X X X O X X O X O O X
AMD SX-33/SX2-66 O O O X O X X O X O O X
AMD DX-33/DX2-66 O O O X O X X O X O O X
AMD SX-40/SX2-80 O O X X O X X O X O O X
AMD DX-40/DX2-80 O O X X O X X O X O O X
AMD Enhance DX2-80 WT O O X X O X X O X O O X
AMD Enhance DX2-80 WB O O X X O X X O X O O X
AMD DX4-100 (Not Enhance) O O O X O X X O X O O X
5V Cyrix SX-25/SX2-50 S-CPU O X X O X X O X O O X X
5V Cyrix DX-25/DX2-50 S-CPU O X X O X X O X O O X X
5V Cyrix SX-33/SX2-66 S-CPU O O O O X X O X O O X X
5V Cyrix DX-33/DX2-66 S-CPU O O O O X X O X O O X X

3.3 Cyrix DX2-66 S-CPU O O O O X X O X O O X X
4V Cyrix DX2-80 S-CPU O O X O X X O X O O X X
UMC SX-33 S-CPU O O O X X O X X X X O O
UMC SX-40 S-CPU O O X X X O X X X X O O

JP15

JP15

JP15

1-2

RN1 RN2 RN3 RN4 RN5 JP5

3-4

5-6

JP5

JP5

1-2

3-4

5-6

Hardware Installation

JP5
7-8

O : Jumper or Resistor installed.
X : Jumper or Resistor not installed.

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GA-486AM
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JP8

JP8

JP9 JP11

JP11

JP12

JP12

JP10 JP23

JP23

1-2

3-4

1-2

2-3

1-2

INTEL SX-25/SX2-50 O X O X O X O X O X X O O
INTEL SX-25/SX2-50 S-CPU X O O X O X O X O X X O O
INTEL DX-25/DX2-50 O X O O X X O X O X X O O
INTEL DX-25/DX2-50 S-CPU X O O O X X O X O X X O O
INTEL P24T 63 WT X O O O X X O X O X X O O
INTEL P24T 63 WB X O O O X X O X O X X O X
INTEL DX4-75(25x3) S-CPU X O O O X X O X O X X X O
INTEL SX-33/SX2-66 O X O X O X O X O X X O O
INTEL SX-33/SX2-66 S-CPU X O O X O X O X O X X O O
INTEL DX-33/DX2-66 O X O O X X O X O X X O O
INTEL DX-33/DX2-66 S-CPU X O O O X X O X O X X O O
INTEL P24T 83 WT X O O O X X O X O X X O O
INTEL P24T 83 WB X O O O X X O X O X X O X
INTEL DX-33 OVERDRIVE O X O O X X O X O X X O O
INTEL DX-33 OVERDRIVE S-CPU X O O O X X O X O X X O O
INTEL P24D WT S-CPU X O O O X X O X O X X O O
INTEL P24D WB S-CPU X O O O X O X X O X X O O
AMD Enhance DX2-66 WT X O X O X X O X O X X O O
AMD Enhance DX2-66 WB X O X O X O X X O X X O O
INTEL DX4-100(33X3) S-CPU X O O O X X O X O X X X O
AMD Enhance DX4-100 WT X O X O X X O X O X X O O
AMD Enhance DX4-100 WB X O X O X O X X O X X O O
INTEL DX4-OVERDRIVE(33X3) S-CPU X O O O X X O X O X X X O
INTEL DX4-100(50X2) S-CPU NOT-RECOMMEND X O O O X X O O O X X X O
AMD SX-25/SX2-50 O X X X O X O X O X X O O
AMD DX-25/DX2-50 O X X O X X O X O X X O O
AMD SX-33/SX2-66 O X X X O X O X O X X O O
AMD DX-33/DX2-66 O X X O X X O X O X X O O
AMD SX-40/SX2-80 O X X X O X O X O X X O O
AMD DX-40/DX2-80 O X X O X X O X O X X O O
AMD Enhance DX2-80 WT X O X O X X O X O X X O O
AMD Enhance DX2-80 WB X O X O X O X X O X X O O
AMD DX4-100 (Not Enhance) O X X O X O X X O X X O O
5V Cyrix SX-25/SX2-50 S-CPU O X O X O X O X O X X O O
5V Cyrix DX-25/DX2-50 S-CPU O X O O X X O X O X X O O
5V Cyrix SX-33/SX2-66 S-CPU O X O X O X O X O X X O O
5V Cyrix DX-33/DX2-66 S-CPU O X O O X X O X O X X O O

3.3 Cyrix DX2-66 S-CPU O X O O X X O X X O X O O
4V Cyrix DX2-80 S-CPU O X O O X X O X X O O O O
UMC SX-33 S-CPU O X X X O X O X O X X O O
UMC SX-40 S-CPU O X X X O X O X O X X O O

2-3

1-2

JP22 JP13 JP20

2-3

O : Jumper or Resistor installed.
X : Jumper or Resistor not installed.

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3-3

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Hardware Installation

3.3 JUMPERS AND CONNECTORS SETTING

• CONNECTOR SETTING

J1: Reset Connector
Open Normal operation.
Close Hardware reset system.

J2: Turbo Switch Connector
Close Low speed.
Open High speed. (Default)

J3: Speaker Connector
1 Data.
2 GND.
3 GND.
4 VCC (+5V).

J4: Power LED & Key-Lock Connector
1 LED anode (+).
2 NC.
3 LED cathode (-).
4 Key-lock.
5 GND.

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

Hard disk Read/Write indicator.

KB1: Keyboard Connector
1 Keyboard clock.
2 Keyboard data.
3 NC.
4 VCC (+5V).
5 GND.

PS1: Power Supply Connector
1 Power good signal.
2,10,11,12 VCC (+5V).
3 +12V.
4 -12V.
5,6,7,8 GND.
9 -5V.

• GREEN FUNCTION JUMPER SETTING

JP2: Turbo LED and Flash Green LED (On board layout, "+" is LED anode)

Normally, this jumper is for Turbo LED. But when system gets into Green
mode, the LED on this jumper will light on once per second.

JP3: Brake Switch

Shorting this jumper and then releasing it immediately will force system

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3-4

GA-486AM
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into Green mode right away.

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

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

JP25: 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.

3.4 SRAM 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 128Kx8-20ns.

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

Size 128K* 256K 256K* 512K 512K* 1M
JP24 1-2 OPN SHT SHT SHT SHT SHT
JP24 3-4 OPN OPN OPN SHT SHT SHT
JP24 5-6 OPN OPN OPN OPN OPN SHT
JP26 3-5 1-3 3-5 2-4 3-5 4-6

DATA SRAM

TAG SRAM

¡¯ U28, U30, U32, U34 Installed only.

32K8 4 pcs 32K8 8 pcs 64K8 4 pcs 64K8 8 pcs 128K8 4 pcs 128K8 8 pcs

8K8 16K8 16K8 32K8 32K8 64K8

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!

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:

______________________________________________________________________

3-5

______________________________________________________________________

Clock JP15

1-2 3-4 5-6
25 MHz Short Open Open
33 MHz Short Short Short
40 MHz Short Short Open
50 MHz Open Open Short

Hardware Installation

• CPU BRAND SELECTION

BRAND JP5 RN1 RN2 RN3 RN4 RN5
Intel, AMD 3-4, 5-6 Installed Installed
Cyrix 1-2, 3-4 Installed Installed
UMC 5-6, 7-8 Installed

• CPU TYPE SELECTION

JP8:

1-2 Others.
2-3 Intel S series, AMD Enhance series.

JP9:

Close Others.
Open AMD, UMC.

JP10:

Close Intel DX4 & AMD Enhance x 2.
Open Intel DX4 & AMD Enhance x 3.

JP11:

1-2 For DX CPU.
2-3 For SX CPU.

JP12:

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

JP13:

Close Others.
Open Intel DX4 & Intel DX4 OverDrive.

• CPU VOLTAGE SELECTION

JP22 JP23 INTEL AMD Cyrix UMC
Open 1-2 3.3V, 5V 3.3V, 5V 5V 5V
Open 2-3 3.3V
Close 2-3 4V

JP20:

Close P24T WT.
Open P24T WB.

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

SETUP, if you already set JP12 or JP20 to support WB CPU.

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3-6

GA-486AM
______________________________________________________________________

3.6 DRAM INSTALLATION

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.

SIMM 1 and SIMM 2 is a group; SIMM 3 and SIMM 4 is the other group. One group
DRAM size can be 2, 4, 8, 16, 32, 64 MB, please install the same DRAM size in one
group. Total DRAM size is 2 MB ~ 128 MB.

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.

3.7 SPEAKER CONNECTOR INSTALLATION

There is always a speaker in AT system for sound purpose. The 4-Pins connector (J3) is
used to connect speaker. The speaker can work well in both direction of connector when it
is installed to the connector (J3) 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 J2 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 FLASH GREEN 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. Normally, the JP2 is a
TURBO LED connector. But when system gets into Green mode, the LED on JP2 will light
on once per second.

______________________________________________________________________

3-7

______________________________________________________________________

Hardware Installation

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 J1 on mainboard.

3.12GREEN FUNCTION INSTALLATION

For the purpose of power saving, there are two jumpers, JP4 and JP3, to make sure the
power saving function doing well. The JP4 is a indicator (Green LED) for Green function. If
the green LED is ON, the system is operating in green mode. The JP3 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.

3.14SOME IMPORTANT APPLICATION NOTES

For compatibility, there are some special application notes the users should know.
Note 1: (AHA 2940 or AHA 3940 or BT 946C PCI SCSI) AND (S3 928 or WD 90C33 PCI

Display)
Please put PCI SCSI CARD in PCI slot1 & PCI Display CARD in PCI slot3 & set
Jumper JP14 2-3 short Jumper JP19 open.

Note 2: (Future Domain or NCR 810 or AHA 3940 PCI SCSI) AND (ET 4000/W32P or S3

864 or S3 964 PCI Display)
Please put PCI SCSI Display CARD in PCI slot1 or slot2 & PCI Display CARD in
PCI slot3 & set Jumper JP18 1-2 short.

Note 3: In order to configure BT 946C PCI SCSI, Please put BT 946C in PCI slot3 & set

Jumper JP18 1-2 short. After configuration, you may put BT 946C in any one of the
PCI slots.

Otherwise, Please keep JP14 pin 1-2 short, JP19 close, JP18 pin 2-3 short.

______________________________________________________________________

3-8

GA-486AM
______________________________________________________________________

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 Setup

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 Option

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

Menu

Setup Menu

Page Setup Menu

______________________________________________________________________

4-1

______________________________________________________________________

BIOS Configuration

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 ( 2A4X5G03 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

PCI/GREEN FUNCTION SETUP

LOAD BIOS DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Time, Date, Hard Disk Type, ...

LOAD SETUP DEFAULTS

PASSWORD SETTING

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

: Select Item
: Change Color

______________________________________________________________________

4-2

GA-486AM
______________________________________________________________________

• 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/GREEN Function Setup

This setup page includes all the configurations of PCI slots parameters and Wake up
events.

• 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.

• 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

______________________________________________________________________

16

BIOS Configuration

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 ( 2A4X5G03 )

STANDARD CMOS SETUP

AWARD SOFTWARE, INC.

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

HARD DISKS TYPE SIZE

Primary Master

Second Master
Second Slave

Drive A
Drive B

Video
Halt On : No Errors

: 1.44 M, 3.5 in.
: 1.2 M, 5.25 in.

: EGA/VGA

ESCF1: Quit

: Help (Shift)F2

: Fri,
: 16 : 12 : 00

: User

52MB

: NonePrimary Slave

0 MB

: None

0

: None

0

Feb 11

1995

CYLS HEADS PRECOMP LANDZ SECTORS

1024

: Select Item

: Change Color

65535 1023 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

yea The year, from 1900 through 2099

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4-4

GA-486AM
______________________________________________________________________

r

• 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

______________________________________________________________________

• Primary Master / Slave, Secondary Master / Salve

BIOS Configuration

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
HEADS number of heads
PRECOMP write precom
LANDZONElanding zone

SECTORS number of sectors

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4-6

GA-486AM
______________________________________________________________________

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

• Drive A type / Drive B type

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

______________________________________________________________________

4-7

______________________________________________________________________

BIOS Configuration

CGA 40 Color Graphics Adapter, power up in 40

column mode

CGA 80 Color Graphics Adapter, power up in 80

column mode

MONO Monochrome adapter, includes high

resolution monochrome adapters

______________________________________________________________________

4-8

GA-486AM
______________________________________________________________________

• Halt on

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

______________________________________________________________________

BIOS Configuration

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

GA-486AM
______________________________________________________________________

4.6 BIOS FEATURES SETUP

ROM PCI/ISA BIOS ( 2A4X5G03 )

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
IDE HDD Block Mode
IDE 32-bit Transfer Mode
IDE PIO Mode 3 Support : Disabled
IDE Second Channel Control

: Disabled
: Enabled
: Enabled

: A, C

: Enabled
: Off
: Disabled
: Disabled

: Enabled

Video BIOS Shadow
C8000 - CBFFF Shadow
CC000 - CFFFF Shadow
D0000 - D3FFF Shadow
D4000 - D7FFF Shadow
D8000 - DBFFF Shadow
DC000 - DFFFF Shadow

ESC

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

• 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.

PU/PD/+/­(Shift)F2

: Enabled
: Disabled
: Disabled
: Disabled
: Disabled
: Disabled
: Disabled

: Select Item
: Modify
: Color

______________________________________________________________________

4-11

______________________________________________________________________

BIOS Configuration

• 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 number.

tracks, Note that BIOS cannot tell from 720, 1.2 or 1.44 drive type as
they are all 80 tracks.

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.

• IDE HDD Block Mode

The default value is Disabled.

Enabled Enable IDE HDD Block Mode.
Disabled Disable IDE HDD Block Mode.

• IDE 32-bit Transfer Mode

The default value is Disabled.

Enabled Enable IDE 32-bit Transfer Mode.
Disabled Disable IDE 32-bit Transfer Mode.

• IDE PIO Mode 3 Support

The default value is Disabled.

Enabled Enable IDE PIO Mode 3 Support.
Disabled Disable IDE PIO Mode 3 Support.

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4-12

GA-486AM
______________________________________________________________________

• IDE Second Channel Control

The default value is Enabled.

Enabled Enable IDE Second Channel.
Disabled Disable IDE Second Channel.

• 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.

• 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 ( 2A4X5G03 )

CHIPSET FEATURES SETUP

AWARD SOFTWARE, INC.

Auto Configuration
AT Bus Clock
DRAM Read Wait States
DRAM Write Wait States
Cache Burst Read
Internal Cache WB/WT
External Cache WB/WT
System BIOS Cacheable
Video BIOS Cacheable : Enabled
Memory Hole Size : None
I/O Recovery Time
Ext-Cache with Dirty Bit : Yes

PCI Posted Memory Write : Enabled

______________________________________________________________________

: Enabled
: PCICLK/4
: 1 WS
: 1 WS
: 2-1-1-1
: Write Thru
: Write Back
: Enabled

: 1 WS

: EnabledSlow Refresh (1/4 Freq)

CPU-to-PCI Post Write
CPU-to-PCI Burst Write
Enhance PCI performance
CPU Clock / PCI Clock
Onboard FDD Controller
Onboard Parallel Mode
Onboard Parallel Port
Onboard Serial Port1
Onboard Serial Port2

ESC

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

4-13

PU/PD/+/­(Shift)F2

: 1 WS
: Enabled
: Enabled
: 1 : 1
: Enabled
: SPP Mode
: 378H
: COM1
: COM2

: Select Item
: Modify
: Color

______________________________________________________________________

BIOS Configuration

• Auto Configuration

The default value is Enabled.

Enabled To Enable auto configuration function.
Disabled To Disable auto configuration function.

• AT Bus Clock

The default value is PCICLK/4.

PCICLK/2 For 40 MHz system.
PCICLK/3 For 25 MHz system.
PCICLK/4 For 33 MHz system.

• DRAM Read Wait States

The default value is 1 WS.

0WS For 25 MHz system.
1WS For 33 MHz system.
2WS For 40 MHz system.
3WS

• DRAM Write Wait States

The default value is 1 WS.

0WS For 25 MHz system.
1WS For 33 MHz system.
2WS For 40 MHz system.
3WS

• Cache Burst Read

Cache Burst Read cycle can be set to 2-1-1-1 or 2-2-2-2 or 3-1-1-1 or 3-2-2-2.
The default value is 2-1-1-1.

• Internal Cache WB / WT

The default value is Write Through.

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

• External Cache WB / WT

The default value is Write Back.

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

• System BIOS Cacheable

The default value is Cacheable.

Cacheable Cache and Shadow system BIOS.
Non-cacheable Shadow system BIOS only.

• Video BIOS Cacheable

The default value is Cacheable.

Cacheable Cache and Shadow video BIOS.
Non-cacheable Shadow video BIOS only.

______________________________________________________________________

4-14

GA-486AM
______________________________________________________________________

• Memory Hole Size

The default value is None.

None System doesn't assign any memory below 16 MB to AT Bus.
64K System assign 64 KB memory size below 16 MB to AT Bus.
128K System assign 128 KB memory size below 16 MB to AT Bus.
256K System assign 256 KB memory size below 16 MB to AT Bus.
512K System assign 512 KB memory size below 16 MB to AT Bus.
1MB System assign 1 MB memory size below 16 MB to AT Bus.
2MB System assign 2 MB memory size below 16 MB to AT Bus.
4MB System assign 4 MB memory size below 16 MB to AT Bus.
8MB System assign 8 MB memory size below 16 MB to AT Bus.

• I/O Recover Time

The default value is 1 WS.

1W For 33MHz,40 MHz or 50 MHz system.
0W For 25 MHz system.

• Ext-Cache with Dirty Bit

The default value is Yes.

Yes Second Cache with Dirty Bit.
No Second Cache without Dirty Bit.

• Slow Refresh (1/4 Freq)

The default value is Enabled.

Enabled Refresh memory per 60£gs.
Disabled Refresh memory per 15£gs.

• PCI Posted Memory Write

The default value is Enabled.

Enabled Enable PCI posted memory write.
Disabled Disable PCI posted memory write.

• CPU-to-PCI Post Write

The default value is 1 WS.

1W For 33MHz,40 MHz or 50 MHz system.
0W For 25 MHz system.

• CPU-to-PCI Burst Write

The default value is Enabled.

Enabled Enable CPU-to -PCI Burst Write.
Disabled Disable CPU-to -PCI Burst Write.

• Enhance PCI performance

The default value is Enabled.

Enabled Enable Enhance PCI performance.
Disabled Disable Enhance PCI performance.

______________________________________________________________________

4-15

______________________________________________________________________

BIOS Configuration

• CPU Clock / PCI Clock

The default value is 1 : 1.

1 :1For 25 MHz or 33 MHz system.

1 :
1/2

For 40 MHz or 50 MHz system.

• 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 Port1

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.

• Onboard Serial Port2

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.

______________________________________________________________________

4-16

GA-486AM
______________________________________________________________________

4.8 POWER MANAGEMENT SETUP

ROM PCI/ISA BIOS ( 2A4X5G03 )
POWER MANAGEMENT SETUP

AWARD SOFTWARE, INC.

Green Function
Green Timer : 2 Min
VGA Adaptor Type : Non-Green
HDD Power Down
Network Card Instlalled
PM Control By APM : Disabled Monitor I/O port : 300h-33Fh
Non-S CPU PMI IRQ

: Enable

: Disable
: No

: IRQ10

*Monitor Event In Full On Mode

Monitor PCI2 Master Card
Monitor PCI3 Master Card
Monitor Video Action

: EnabledMonitor PCI1 Master Card
: Enabled
: Enabled
: Enabled

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

PU/PD/+/­(Shift)F2

: Select ItemESC
: Modify
: Color

• Green Function

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.)

• Green Timer

The default value is 2 minute.

0.25 min - 512 min Enable System's Green Timer function between 0.25

• VGA Adaptor Type

This category can be accessed while S-Series CPU installed.
The default value is Non-Green.

Green BIOS will turn off H-SYNC & V-SYNC when gets into Green mode

Non-Green BIOS will only black monitor when gets into Green mode.

minute to 512 minute.

for Green monitor power saving.

______________________________________________________________________

4-17

______________________________________________________________________

BIOS Configuration

• HDD Power Down

The default value is Disabled.

Disabled Disable HDD Power Down mode function.
1 - 15
Mins

Enable HDD enter Power Down mode between 1 to 15 mins.

• Network Card Installed

The default value is NO.

YES Network Card Installed.
NO 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.

• PM Control By APM

The default value is Disabled.

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

Disabled 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.

• Non-S CPU PMI IRQ

The default value is IRQ10.

IRQ10 use IRQ10 to close monitor in DOS system only.

¡°This option is for Non-S CPU only. (AMD not Enhance) If you use S CPU, you will not

see this option.

• Monitor PCI1-3 Master Card.

The system gets into green mode or not depending on the status of PCI1-3 Master
Card, Video Action. The default value is Enabled.

Enabled System will not get into green mode when PCI1-3 Master Card, Video

Disabled System will get into green mode no matter what PCI1-3 Master Card,

Action is active.

Video Action is active or not.

• Monitor I/O port

System will not get into green mode when I/O port is active.
The default value is 300h ~ 33Fh.
I/O port include: 100h ~ 13Fh, 140h ~ 17Fh

180h ~ 1BFh, 1C0h ~ 1FFh
200h ~ 23Fh, 240h ~ 27Fh
280h ~ 2BFh, 2C0h ~ 2FFh
300h ~ 33Fh, 340h ~ 37Fh
380h ~ 3BFh, 3C0h ~ 3FFh
Disabled

______________________________________________________________________

4-18

GA-486AM
______________________________________________________________________

4.9 PCI /GREEN FUNCTION SETUP

ROM PCI/ISA BIOS ( 2A4X5G03 )
PCI / GREEN FUNCTION SETUP

AWARD SOFTWARE, INC.

Slot 1 Using INT# : AUTO
Slot 2 Using INT#
Slot 3 Using INT#
GA-410 Using INTA IN : SLOT1
1st Available IRQ : 11
2nd Available IRQ
3rd Available IRQ
4th Available IRQ
PCI IRQ Actived By : Edge
Onboard PCI IDE : Enabled

: AUTO

: 12
: 9
: 10

*WakeUp Event In Inactive Mode:
Monitor IRQ3: AUTO
Monitor IRQ5
Monitor IRQ7
Monitor IRQ9
Monitor IRQ10
Monitor IRQ12

: Enabled

: Disabled

: Disabled

: Disabled

: Disabled

: Disabled

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

PU/PD/+/­(Shift)F2

: Select ItemESC

: Modify
: Color

• SLOT 1~3 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.

• GA-410 Using INTA IN

The default value SLOT1.
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.

______________________________________________________________________

4-19

______________________________________________________________________

BIOS Configuration

• PCI IRQ Actived By

The default value is Edge.

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

• Onboard PCI / IDE

The default value is Enable.

Enabled Enable onboard PCI IDE Function.
Disabled Disable onboard PCI IDE Function.

• PCI IDE IRQ Map To

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

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.
PCI-AUTO Map PCI IDE IRQ to PCI slot automatically.

• 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.

• Monitor IRQ3

The default value is Enabled.

Enabled System will wake up when IRQ3.
Disabled System will not wake up no matter what IRQ3.

• Monitor IRQ5,7,9,10,12

The default value is Disabled.

Enabled System will wake up when IRQ5,7,9,10,12 acting.
Disabled System will not wake up no matter what IRQ5,7,9,10,12 acting.

______________________________________________________________________

4-20

GA-486AM
______________________________________________________________________

4.10LOAD BIOS DEFAULTS

ROM PCI/ISA BIOS ( 2A4X5G03 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMEN

PCI / GREEN FUNCTIO

LOAD BIOS DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Load BIOS Defaults (Y/N)? N

Load SETUP Defaults except Standard CMOS SETUP

LOAD SETUP DEFAULTS

PASSWORD SETTING

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

• Load BIOS Defaults

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

: Select Item

: Change Color

______________________________________________________________________

4-21

______________________________________________________________________

BIOS Configuration

4.11LOAD SETUP DEFAULTS

ROM PCI/ISA BIOS ( 2A4X5G03 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMEN

PCI / GREEN FUNCTIO

LOAD BIOS DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Load SETUP Defaults (Y/N)? N

Load SETUP Defaults except Standard CMOS SETUP

LOAD SETUP DEFAULTS

PASSWORD SETTING

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

• Load Setup Defaults

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

: Select Item

: Change Color

______________________________________________________________________

4-22

GA-486AM
______________________________________________________________________

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 ( 2A4X5G03 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMEN

PCI / GREEN FUNCTIO

LOAD BIPS DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Enter Password:

Change / Set / Disabled Password

LOAD SETUP DEFAULTS

PASSWORD SETTING

IDE HDD AUTO DETECTION

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.

______________________________________________________________________

4-23

______________________________________________________________________

BIOS Configuration

4.13IDE HDD AUTO DETECTION

ROM PCI/ ISA BIOS ( 2A4X5G03 )

STANDARD CMOS SETUP

AWARD SOFTWARE, INC.

HARD DISKS TYPE SIZE

Primary Master::

OPTIONS SIZE CYLS. HEADS PRECOMP LANDZONE SECTORS MODE

2(Y)31081
1

1082
1083

524
2099 16
1049

CYLS HEADS PRECOMP LANDZ SECTOR MODE

Select Primary Master Option ( N:Skip ): N

64

32 2098

0 63
65535
65535

ESC : Skip

2098
2098

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.

______________________________________________________________________

4-24

GA-486AM
______________________________________________________________________

4.14SAVE & EXIT SETUP

ROM PCI/ISA BIOS ( 2A4X5G03 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMEN

PCI / GREEN FUNCTIO

LOAD BIOS DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

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

Save Data CMOS & Exit SETUP

LOAD SETUP DEFAULTS

PASSWORD SETTING

IDE HDD AUTO DETECTION

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.

______________________________________________________________________

4-25

______________________________________________________________________

BIOS Configuration

4.15EXIT WITHOUT SAVING

ROM PCI/ISA BIOS ( 2A4X5G03 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMEN

PCI / GREEN FUNCTIO

LOAD BIOS DEFAULTS

ESC

: Quit

F10

: Save & Exit Setup (Shift)F2

Quit Without Saving (Y/N) N

Abandom all Dats & Eixt SETUP

LOAD SETUP DEFAULTS

PASSWORD SETTING

IDE HDD AUTO DETECTION

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.

4.16KEYBOARD 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 J2 open, pressing these keys simultaneously will change the

"CTRL_ALT_[-]" If J2 open, pressing these keys simultaneously will change the

WARM START (Soft Reset).

system speed to high speed (TURBO, all cache memory
enabled).

system speed to low speed (Normal, disable cache memory).

______________________________________________________________________

4-26

GA-486AM
______________________________________________________________________

5 AT TECHNICAL INFORMATION

5.1 BUS CONNECTOR PIN OUT

5.1.1ISA BUS SLOT PIN OUT

B01

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

B02
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

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

-I/O CH CHKGND
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

______________________________________________________________________

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-486AM
______________________________________________________________________

5.2 I/O & MEMORY MAP

MEMORY MAP: [0000000-

009FFFF]
[00A0000­00BFFFF]
[00C0000­00DFFFF]
[00E0000­00EFFFF]
[00F0000­00FFFFF]
[0100000­BFFFFFF]

I/O MAP: [000-01F] DMA controller.(Master)

[040-05F] TIMER control registers.
[060-06F] KEYBOARD interface controller.(8042)
[070-07F] RTC ports & CMOS I/O ports.
[080-09F] DMA register.
[0A0-0BF] INTERRUPT controller.(Slave)
[0C0-0DF] DMA controller.(Slave)
[0F0-0FF] MATH COPROCESSOR
[1F0-1F8] HARD DISK controller.
[278-27F] PARALLEL port-2.
[2B0-2DF] GRAPHICS adapter controller.
[2F8-2FF] SERIAL port-2.
[360-36F] NETWORK ports.
[378-37F] PARALLEL port-1
[3B0-3BF] MONOCHROME & PRINTER adapter.
[3C0-3CF] EGA adapter.
[3D0-3DF] CGA adapter.
[3F0-3F7] FLOPPY DISK controller.
[3F8-3FF] SERIAL port-1.

System memory used by DOS and application
program.
Display buffer memory for
VGA/EGA/CGA/MONOCHROME adapter.
Reserved for I/O device BIOS ROM or RAM buffer.

Reserved for PCI device ROM.
System BIOS ROM.
System extension memory.

INTERRUPT controller.(Master)
CHIPSET control registers I/O ports.

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

5-3

______________________________________________________________________

DMA Channel-7 Available

AT Technical Information

______________________________________________________________________
5-4

GA-486AM
______________________________________________________________________

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

______________________________________________________________________

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

5-5

______________________________________________________________________

AT Technical Information

40-7f Reserved for CHIPSET SETTING DATA

______________________________________________________________________
5-6

GA-486AM
______________________________________________________________________

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.

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GA-486AM
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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

Toggle

5 Blank video, Initialize

keyboard
6 Reserved
7 Test CMOS Interface

and Battery Status
BE Chipset Default

Initialization
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

Initialization
A Setup Interrupt Vector

Table
B Test CMOS RAM

Checksum
C Initialize keyboard Detect type of keyboard controller (optional).

D Initialize Video Interface Detect CPU clock.

E Test Video Memory Test video memory, write sign-on message to screen.

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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.

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.

B-1

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Appendix B:Post Codes

F Test DMA Controller 0 BIOS checksum test.

10 Test DMA Controller 1
11 Test DMA Page

registers
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

Interrupt Bits
18 Test 8259 Interrupt

Functionality
19 Test Stuck NMI Bits

(Parity/IO Check)
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

Extended Memory
31 Test Base and

Extended Memory

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

Mouse
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 &

Controller
42 Initialize Hard Drive &

Controller
43 Detect & Initialize

Serial/Parallel Ports
44 Reserved
45 Detect & Initialize Math

Coprocessor
46 Reserved
47 Reserved
48-4D Reserved
4E Manufacturing POST

Loop or Display

Messages
4F Security Check Ask password security (optional).
50 Write CMOS Write all CMOS values back to RAM and clear screen.

Keyboard detect and initialization.

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.

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51 Pre-boot Enable Enable parity checker.

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

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

Enable NMI, Enable cache before boot.

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

Boot via INT 19h.

Press F1 to disable NMI, F2 reboot.

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B-3

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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

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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 q 512 KB q 1 MB

TAG: DATA:

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

MB

q MFM q RLL q IDE q EDSI q SCSI

Tel. No.
Fax. No.
Purchase Date

5. Problem Description:

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