Gigabyte GA-486VS Rev. 8B GA-486VS rev 8B User manual

GA - 486VS / 486VF

USER'S MANUAL

(GREEN SOLUTION)

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

Rev. 8B Eighth Edition

GA-486VF / VS
________________________________________________________________

Addendum

To correctly configure your system for an AMD 486 DX2-80 CPU. The
"Chipset Features Setup", In the BIOS setup utilities, must be set to BIOS
Defaults(F6).

If the Auto Configure utility is "enabled" for an AMD 486 DX2-80, memory
errors may occur.

Note: If you use AMD DX2-80 3.3V CPU, PLS check the following.

1. Take out the Jumpers on JP36 & JP37.

2. Make sure loading BIOS Default only for AWARD Aug/01/94" BIOS.

AWARD BIOS which is newer than Aug/01/94" can support loading
Set

Up Default.

3. We support AMD DX2-80 3.3V CPU from P.C.B. REV.8A with blue wire

on the back side & P.C.B. REV.8B.

¯ All of the items or discription regarding DX4
CPU in this manual don't support for those
motherboards without 3.3V regurator.

The author assumes no responsibility for any errors or omissions which may be
appeared 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.
MS-DOS, WINDOWS NT are registered trademarks of Microsoft Corporation.
UNIX is a trademark of Bell Laboratories.

________________________________________________________________

2

Table of Contents

________________________________________________________________

Table of Contents

1.INTRODUCTION............................................................................................ 5

1.1.PREFACE............................................................................................5

1.2.KEY FEATURES ................................................................................. 5

1.3.PERFORMANCE LIST ........................................................................7

1.4.BLOCK DIAGRAM............................................................................... 8

1.5.INTRODUCE THE VL-BUS .................................................................8

2.SPECIFICATION............................................................................................10

2.1.HARDWARE........................................................................................10

2.2.SOFTWARE........................................................................................11

2.3.ENVIRONMENT.................................................................................. 11

3.HARDWARE INSTALLATION........................................................................12

3.1.UNPACKING .......................................................................................12

3.2.MAINBOARD LAYOUT........................................................................13

3.3.QUICK REFERENCE FOR JUMPERS & CONNECTORS..................14

3.4.DRAM INSTALLATION........................................................................ 17

3.5.SRAM INSTALLATION AND JUMPERS SETUP.................................19

3.6.CPU INSTALLATION AND JUMPERS SETUP ...................................20

3.7.EXT. POWER CONTROL PORT.........................................................21

3.8.CMOS BATTERY JUMPER SETUP....................................................21

3.9.SPEAKER CONNECTOR INSTALLATION .........................................22

3.10.POWER LED & KEY LOCK CONNECTOR INSTALLATION ............22

3.11.TURBO SWITCH CONNECTOR INSTALLATION ............................23

3.12.TURBO LED CONNECTOR INSTALLATION.................................... 23

3.13.HARDWARE RESET SWITCH CONNECTOR INSTALLATION.......23

3.14.GREEN FUNCTION INSTALLATION................................................23

3.15.PERIPHERAL DEVICE INSTALLATION ...........................................24

4.BIOS CONFIGURATION................................................................................25

4.1.ENTERING SETUP............................................................................. 25

4.2.CONTROL KEYS.................................................................................25

4.3.GETTING HELP ..................................................................................26

4.3.1.Main Menu................................................................................26

4.3.2.Status Page Setup Menu / Option Page Setup Menu...............26

4.4.THE MAIN MENU................................................................................27

4.5.STANDARD CMOS SETUP MENU.....................................................28

4.6.BIOS FEATURES SETUP...................................................................33

4.7.CHIPSET FEATURES SETUP............................................................ 36

_ This options is valued from BIOS Date Code 03/25/94........................ 39

4.8.POWER MANAGEMENT SETUP........................................................39

4.9.LOAD BIOS DEFAULTS...................................................................... 41

4.10.LOAD SETUP DEFAULTS ................................................................42

4.11.PASSWORD SETTING.....................................................................43

4.12.IDE HDD AUTO DETECTION ...........................................................44

4.13.SAVE & EXIT SETUP........................................................................45

4.14.EXIT WITHOUT SAVING.................................................................. 46

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3

GA-486VF / VS
________________________________________________________________

4.15.KEYBOARD SETTING FUNCTION...................................................46

5.AT TECHNICAL INFORMATION ...................................................................47

5.1.I/O BUS CONNECTOR PIN OUT........................................................47

5.1.1.ISA BUS SLOT PIN OUT..........................................................47

5.1.2.VL-BUS SLOT PIN OUT...........................................................48

5.2.I/O & MEMORY MAP...........................................................................49

5.3.TIMER & DMA CHANNELS MAP........................................................ 49

5.4.INTERRUPT MAP ............................................................................... 50

5.5.RTC & CMOS RAM MAP..................................................................... 51

APPENDIX A: POST MESSAGE.......................................................................52

APPENDIX B: POST CODES ........................................................................... 56

APPENDIX C: BIOS DEFAULT DRIVE TABLE................................................. 59

APPENDIX D: PROBLEM SHEET ....................................................................61

________________________________________________________________

4

Introduction

________________________________________________________________

1.INTRODUCTION

1.1.PREFACE

Welcome to use the GA-486VF/486VS motherboard. The motherboard is a 64
KB - 512 KB CACHE 486DX PC/AT compatible system with ISA bus and VESA
LOCAL BUS (VL-Bus), and has been designed to be the fastest 486 PC/AT
system and the GREEN FUNCTION (Power-Down Mode) had be added. There
are some new features allow 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

q 80486 based PC/AT compatible mainboard with VL-Bus.

q 3 VL-Bus slots.

q Supports 486DX/DX2/SX/S-Series/OverDrive/P24T/DX4 running at 25 - 100

MHz.

q Supports True Green Function.

q Supports Intel, AMD and Cyrix CPU.

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

q Supports 64 / 128 / 256 / 512 KB 2nd cache memory operated in BURST

mode.

q Write-Back cache operation.

q Supports 1 - 128 MB DRAM memory on board.

q Supports 256 KB DRAM re-map function.

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GA-486VF / VS
________________________________________________________________

q Supports shadow RAM for BIOS & VIDEO BIOS.

q Supports shadow RAM cacheable function to improve performance.

q Supports H/W & S/W speed change function.

q Licensed AWARD BIOS.

q Ni-HY Rechargeable battery on board.

q 2/3 BABY AT size (22 cm x 25 cm) with 6 AT slots, 1 XT slot.

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6

Introduction

________________________________________________________________

1.3.PERFORMANCE LIST

The following performance data list is the testing results of some popular
benchmark testing programs. These data are just referred by 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 Intel 486DX4-100,DX4-75,DX2-66/50,DX-50/33,AMD486DX-40
DRAM 8 MB - 70 ns
DISPLAY GA-302 S3 805 GUI VGA
H.D.D. GA-403 VL-Bus SCSI
O.S. MS-DOS 6.2
CACHE SIZE 256 KB

Software Ver. Item Unit DX4-100

(50 x 2)
LandMark 1.14 CPU MHz 200+ 200+ 200+ 200+
LandMark 2.0 CPU MHz 363.42 363.21 290.66 272.40

FPU MHz 853.96 853.46 682.95 640.08
SI 7.0 CPU 198.1 198.0 158.4 148.5
Benchmark 8.0 Processor Score 58.55 60.08 46.54 44.82
PM 1.7 Mips Mips 35.8 33.3 28.4 24.8

Dhrystone K-Dstone/s 47.6 45.0 37.9 33.8

Whetstone K-Wstone/s 9993.1 9702.1 7994.5 7294.3
Byte 2.1 CPU AT Class 16.13 15.39 12.90 11.54

386 Class 5.80 5.51 4.64 4.13

FPU AT Class 98.88 98.82 79.08 74.12

386 Class 13.83 13.83 11.06 10.37

Software Ver. Item Unit DX2-66 DX-50 DX-40 DX2-50 DX-33
LandMark 1.14 CPU MHz 200+ 200+ 182.3 200+ 151.9
LandMark 2.0 CPU MHz 222.97 167.32 133.81 167.22 111.47

FPU MHz 568.36 426.52 341.10 426.69 284.16
SI 7.0 CPU 144.0 108.0 86.4 108.0 72.0
Benchmark 8.0 Processor Score 44.62 35.28 28.22 33.37 25.17
PM 1.7 Mips Mips 28.4 22.1 17.7 21.4 14.8

Dhrystone K-Dstone/s 36.5 28.4 22.7 27.3 19.0

Whetstone K-Wstone/s 6618.0 4996.6 3981.3 4971.7 3320.0
Byte 2.1 CPU AT Class 12.13 10.98 8.77 9.05 8.24

386 Class 4.57 4.29 3.42 3.41 3.29

FPU AT Class 65.92 49.47 39.56 49.44 32.96

386 Class 9.22 6.92 5.54 6.92 4.61

DX4-100

(33.3 x 3)

DX4-75
(40 x 2)

DX4-75
(25 x 3)

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GA-486VF / VS
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1.4.BLOCK DIAGRAM

D<0..31>
A<0..31>

VESA Local Bus

SD<0..15>
SA<0..15>

8 MHz

AT Bus

80486

MA,RAS,CAS

85C471

OSC

Cache SRAM

Clock Buffer

85C407

Memory DRAM

1.5.INTRODUCE THE VL-BUS

8042

BIOS ROM

Connecting devices to a CPU local bus 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. Many mainboard and chipset manufactures
developed their own local bus implementations, but they are incompatible with
each other. The Video Electronics Standards Association (VESA) VL-Bus
specification was created to end this confusion.

________________________________________________________________

8

Introduction

________________________________________________________________

The VL-Bus standard, under development since November 1991, is designed to
bring workstation-level performance to a standard PC platform. The VL-Bus
removes many of the bottlenecks that have hampered PCs for several years. On
the VL-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.

VESA's VL-Bus standard provides end-users with a low-cost, extendible, and
portable local bus design, which will allow systems and peripherals from different
manufactures to work seamlessly together.

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9

GA-486VF / VS

−

−

−

________________________________________________________________

2.SPECIFICATION

2.1.HARDWARE

n CPU

n COPROCESSOR − 80387DX included in 80486DX.
n SPEED − 25 / 33 / 40 / 50 MHz system and VL-Bus speed.

n GREEN FUNCTION − Power Down Timer from 10 sec. to 10 mins.

n DRAM MEMORY − 2 banks 30 pins SIMM module sockets on board

n CACHE MEMORY − 8 KB cache memory included in 80486 DX / SX.

n SHADOW RAM − Main BIOS shadow function programmable.

80486SX/DX/DX2/S-Series, 80487SX, OverDrive,
P24T, DX4.

− 237 pin (Socket 3) ZIF white socket / LIF socket
on board.

− 8 MHz (programmable) AT Bus speed.
H / W and S / W speed switchable function (cache
or non-cache).

− When enter Power Down Mode, 8 MHz system
speed for non S-Series and 0 MHz system speed
for S-Series.

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

− Support IDE Hard Disk Standby Mode control.

− Wake Up by all IRQ and DMA, Local Bus Master

and Device Cannel.

− Support Green LED Indicator and Green Switch.
for 486VF.

− 8 banks 72 pins SIMM module sockets on board
for 486VS.

− Use 256 KB / 1 / 4 / 16 MB 70 ns SIMM module
DRAM for 486VF.
Use 256 KB / 1 / 2 / 4 / 8 / 16 / 32 MB 70 ns SIMM
module DRAM for 486VS.

− Support Fast Page DRAM access mode.

− 16 KB cache memory included in DX4.

− 64 / 128 / 256 / 512 KB 2 cache memory on

board.

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

− Video BIOS shadow function programmable.

− Shadow RAM cacheable function programmable.

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10

Specification

________________________________________________________________

n RE-MAP DRAM − 256 KB DRAM re-locatable.
n I/O BUS SLOTS − 3 VL-Bus.

− 6 AT Bus, 1 XT Bus.

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

2.2.SOFTWARE

n BIOS − Licensed AWARD BIOS.

− AT CMOS Setup, Advanced / Chipset Setup,

Power Management and Hard Disk Utility
included.

n O. S. − Operation with MS-DOS, OS/2 NOVELL, SCO

UNIX.

2.3.ENVIRONMENT

n AMBIENT TEMP.
n RELATIVE HUM. − 0 to +85% (operating).
n ALTITUDE − 0 to 10,000 feet (operating).
n VIBRATION − 0 to 1,000 Hz.
n ELECTRICITY − 4.9 V to 5.2 V.

− 0 to +50°C (operating).

− 3 A to 5 A current.

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GA-486VF / VS
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3.HARDWARE INSTALLATION

3.1.UNPACKING

The mainboard package should contain the following:

l The GA-486VF/486VS mainboard

l User's manual

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 maniboard. 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.

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12

Hardware Installation

________________________________________________________________

3.2.MAINBOARD LAYOUT

×GA-486VSØ

1

J7

JP29

J6

VESA3

VESA2

SL13

SL12

SL07

SL06

J5

JP24

J4

4

6

3

JP26

2

5

1

J3

1

+

JP37

JP34
JP18

JP20+1

J9J8J2

1 1 1

JP7
JP6
JP5

U11

TAG

×GA-486VFØ

1

J7

JP29

J6

VESA1

CPU

P24T/C

486DX/SX

M6

23

JP36

1

JP30JP11

JP8

1

GA-486VS REV.8B

JP3
JP2
JP1

VESA3

VESA2

U19

1

U15

85C471

JP4

SL11

SL10

SL09

SL08

U14

85C407

SRAMSRAM
BANK0BANK1

8/32/128KBX88/32/128KBX8

SL13

SL12

JP21

1

BANK0 SIMM1

72

72

72

BANK1 SIMM2

BANK2 SIMM3

BANK3 SIMM4

SL05

SL04

SL03

SL02

SL01

SL07

SL06

CN2

JP17

1

JP33

JP16

1

804227010

1

112

J1

172

1

CN1

1

1

J5

J4

+

JP26

1

J3

+

JP34
JP18

JP20

1

J9J8J2

1 1 1

U11

TAG

JP7
JP6
JP5

JP24

6

5

JP37

JP11

VESA1

4

CPU

3

P24T/C

2

486DX/SX

1

JP36

JP30

JP8

1

GA-486VF REV.8B

JP3
JP2
JP1

U19

M6

23
1

U15

85C471

SRAMSRAM
BANK0BANK1

8/32/128KBX88/32/128KBX8

1

JP4

SL11

SL10

SL09

SL08

U14

85C407

SL05

JP21

1

BANK0 SIMM1
30
30
30
30
30
30
30

BANK0 SIMM2

BANK0 SIMM3

BANK0 SIMM4

BANK1 SIMM5

BANK1 SIMM6

BANK1 SIMM7

BANK1 SIMM8

SL04

SL03

SL02

SL01

JP17

1

JP33

JP16

1

804227010

1

J1
130
1
1

CN2

1
1
1
1
1

CN1

12

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GA-486VF / VS
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3.3.QUICK REFERENCE FOR JUMPERS &
CONNECTORS

t J5: Speaker Connector

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

t J7: Power LED & Key-Lock Connector

1 LED Anode (+)
2 NC
3 LED Cathode (-)
4 Key-Lock
5 GND

t J6: Reset Connector

Open For Normal Operation

Close For Hardware Reset System

t J4: TURBO LED Connector

1 LED Anode (+)
2 LED Cathode (-)

t J3: TURBO Switch Connector

2-3 For High Speed
1-2 For Low Speed (1/3 Speed)

t J1: External Battery Connector

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

t JP10: AMD CPU Selection Jumper

Open AMD DXL CPU X 3

Short AMD DXL CPU X 2

This option is supported from PCB Rev. 8B.

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Hardware Installation

________________________________________________________________

t CN1: Keyboard Connector

1 Keyboard Clock
2 Keyboard Data
3 NC
4 VCC (+5V)
5 GND

t CN2: Power Connector

1 Power Good Signal

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

3 (+12V)
4 (-12V)

5,6,7,8 GND

9 (-5V)

t JP1 ~ JP4: SRAM Size Setup Jumpers
JP. No 64 KB 128 KB 256 KB 256 KB¬ 512 KB

JP1 OFF ON ON ON ON
JP2 OFF OFF ON ON ON
JP3 OFF OFF OFF OFF ON
JP4 1-2 2-3 1-2 1-2

¬ Using 64 KB x 8 SRAM from U1 to U4.
t JP8: CPU Type Selection Jumper

Pin No Function

1-2 Close for 80486DX2, DX or OverDrive Installed.
2-3 Close for 80486SX Installed.

t JP11: AMD CPU Selection Jumper
Pin No Function

1-2 Close for Non AMD CPU Selection.

Open for AMD CPU Selection.

t JP18: Cyrix CPU Selection

Open For Cyrix CPU installed.

Close For normal operation.

t JP20: Delay CPU Clock
Pin No Function

1-2 For some VL-Bus interface card that need more address hold time in

DX4-100, DX4-75 or DX2-50. If you don't have any problem, please
always keep the jumper pin 2-3 short.

2-3 Close for normal operation.

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15

GA-486VF / VS
________________________________________________________________

t JP21: Cyrix & P24D CPU Selection
Pin No Function

1-2 Cyrix CPU, P24D

¬ P24D is suppored from PCB REV.8A & BIOS July, 12 1994 or later.

2-3 Others.

¬ This option is valued from Rev.6.
t JP24: DX4 & Cyrix & P24D CPU Selection

Pin No Function

3-4 "Open" for DX4 CPU x 3, "Close" for DX4 CPU x 2.
2-3 Close for Cyrix CPU. ¬ This option is valued from Rev.6.
2-5 Close for P24D.

¬ P24D is suppored from PCB REV.8A & BIOS July, 12 1994 or later.

t JP36 ~ JP37: CPU Voltage Selection

JP36 JP37 Function

Close Close For 5 Voltage CPU.

Open Open For 3.3 Voltage DX4 CPU.

t JP5 ~ JP7: Clock Generator Frequency Setup

JP No 50 MHz 40 MHz 33 MHz 25 MHz

5 ON OFF ON OFF
6 OFF ON ON OFF
7 OFF ON ON ON

t JP16: CMOS Clear / Power Supply Jumper
Pin No Function

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

t JP29: VL-Bus Speed Configuration

Close For DX-50 / 40 MHz.

Open For Other Speed.

¬ JP29 is default to be closed for safety reason. If your system is 33MHz or

below and some of your VL - BUS interface card have to monitor this jumper
to identify system speed, this is the only case that you have to open the
jumper.

t JP30: AMD CPU Selection Jumper

1-2 AMD DXL CPU X 3
2-3 AMD DXL CPU X2

¬ This option is valued from P.C.B. REV.8B.

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16

Hardware Installation

________________________________________________________________

t J2, J8, J9: Delay Local Bus Clock
Pin No Function

1-2 For normal operation.
2-3 For some VL-Bus interface card that need more address setup time in

DX4-100, DX4-75, DX2-66, DX-50, DX-40 or DX-33.

J2 is for VESA1 slot. J8 is for VESA2 slot. J9 is for VESA3 slot. If you don't have
any problem, please always keep these jumpers pin 1-2 short.

t JP33: External Power Control Port
Pin No Function

1 Control Signal (Low Level for Enter Power Down Mode).
2 Signal Ground (GND).

t JP26: Green Switch

Open For normal operation.

Close To get into Green mode.

t JP34: Green LED Connector

1 LED Anode (+).
2 LED Cathode (-).

t JP17: Display Type Setup Jumper

Close For CGA.

Open For Others

3.4.DRAM INSTALLATION

GA-486VF can be installed with 256 KB, 1, 4 or 16 MB 30 pins SIMM module
DRAM and GA-486VS can be installed with 256 KB, 1, 2, 4, 8, 16 or 32 MB 72
pins SIMM module DRAM. The DRAM speed of both mainboard is using 70 ns.
The banks of memory system on GA-486VF or GA-486VS consists from bank 0
to bank 1 or from bank 0 to bank 3 respectively. The DRAM of bank 0 must be
installed first, then bank 1. The total memory size is from 1 to 128 MB, and
various configuration of DRAM types in the following table are available.

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17

GA-486VF / VS
________________________________________________________________

×For GA-486VSØ

Bank 0 Bank 1 Bank 2 Bank 3 Total
256KB x 32/36 - S 1 MB
256KB x 32/36 - S 256KB x 32/36 - S 2 MB
256KB x 32/36 - S 256KB x 32/36 - S 512KB x 32/36 -D 4 MB
256KB x 32/36 - S 256KB x 32/36 - S 1MB x 32/36 - S 6 MB
256KB x 32/36 - S 256KB x 32/36 - S 512KB x 32/36 - D 1MB x 32/36 - S 8 MB
256KB x 32/36 - S 256KB x 32/36 - S 1MB x 32/36 - S 1MB x 32/36 - S 10 MB
256KB x 32/36 - S 256KB x 32/36 - S 4MB x 32/36 - S 18 MB
512KB x 32/36 - D 2 MB
512KB x 32/36 - D 512KB x 32/36 - D 4 MB
512KB x 32/36 - D 1MB x 32/36 - S 6 MB
512KB x 32/36 - D 512KB x 32/36 - D 1MB x 32/36 - S 8 MB
512KB x 32/36 - D 512KB x 32/36 - D 1MB x 32/36 - S 1MB x 32/36 - S 12 MB
512KB x 32/36 - D 4MB x 32/36 - S 18 MB
512KB x 32/36 - D 512KB x 32/36 - D 4MB x 32/36 - S 20 MB
512KB x 32/36 - D 512KB x 32/36 - D 1MB x 32/36 - S 4MB x 32/36 - S 24 MB
512KB x 32/36 - D 512KB x 32/36 - D 4MB x 32/36 - S 4MB x 32/36 - S 36 MB
1MB x 32/36 - S 4 MB
1MB x 32/36 - S 1MB x 32/36 - S 8 MB
1MB x 32/36 - S 1MB x 32/36 - S 1MB x 32/36 - S 12 MB
1MB x 32/36 - S 1MB x 32/36 - S 1MB x 32/36 - S 1MB x 32/36 - S 16 MB
1MB x 32/36 - S 4MB x 32/36 - S 20 MB
1MB x 32/36 - S 1MB x 32/36 - S 4MB x 32/36 - S 24 MB
1MB x 32/36 - S 4MB x 32/36 - S 4MB x 32/36 - S 36 MB
1MB x 32/36 - S 1MB x 32/36 - S 4MB x 32/36 - S 4MB x 32/36 - S 40 MB
2MB x 32/36 - D 8 MB
2MB x 32/36 - D 2MB x 32/36 - D 16 MB
2MB x 32/36 - D 2MB x 32/36 - D 2MB x 32/36 - D 24 MB
2MB x 32/36 - D 2MB x 32/36 - D 2MB x 32/36 - D 2MB x 32/36 - D 32 MB
4MB x 32/36 - S 16 MB
4MB x 32/36 - S 4MB x 32/36 - S 32 MB
4MB x 32/36 - S 4MB x 32/36 - S 4MB x 32/36 - S 48 MB
4MB x 32/36 - S 4MB x 32/36 - S 4MB x 32/36 - S 4MB x 32/36 - S 64 MB
256KB x 32/36 - S 1MB x 32/36 - S 5 MB
256KB x 32/36 - S 4MB x 32/36 - S 17 MB
256KB x 32/36 - S 16MB x 32/36 - S 65 MB
1MB x 32/36 - S 16MB x 32/36 - S 68 MB
1MB x 32/36 - S 1MB x 32/36 - S 16MB x 32/36 - S 72 MB
4MB x 32/36 - S 16MB x 32/36 - S 80 MB
4MB x 32/36 - S 4MB x 32/36 - S 16MB x 32/36 - S 96 MB
16MB x 32/36 - S 64 MB
16MB x 32/36 - S 16MB x 32/36 - S 128 MB
1MB x 32/36 - S 8MB x 32/36 - D 36 MB
1MB x 32/36 - S 8MB x 32/36 - D 8MB x 32/36 - D 68 MB

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18

Hardware Installation

________________________________________________________________

1MB x 32/36 - S 1MB x 32/36 - S 8MB x 32/36 - D 40 MB
1MB x 32/36 - S 1MB x 32/36 - S 8MB x 32/36 - D 8MB x 32/36 - D 72 MB
4MB x 32/36 - S 8MB x 32/36 - D 48 MB
4MB x 32/36 - S 8MB x 32/36 - D 8MB x 32/36 - D 80 MB
4MB x 32/36 - S 4MB x 32/36 - S 8MB x 32/36 - D 64 MB
4MB x 32/36 - S 4MB x 32/36 - S 8MB x 32/36 - D 8MB x 32/36 - D 96 MB
8MB x 32/36 - D 32 MB
8MB x 32/36 - D 8MB x 32/36 - D 64 MB
8MB x 32/36 - D 8MB x 32/36 - D 8MB x 32/36 - D 96 MB
8MB x 32/36 - D 8MB x 32/36 - D 8MB x 32/36 - D 8MB x 32/36 - D 128 MB

×For GA-486VFØ

Bank 0 Bank 1 Total
256KB x 8 / 9 4pcs 1 MB
256KB x 8 / 9 4pcs 256KB x 8 / 9 4pcs 2 MB
1MB x 8 / 9 4pcs 4 MB
1MB x 8 / 9 4pcs 1MB x 8 / 9 4pcs 8 MB
1MB x 8 / 9 4pcs 4MB x 8 / 9 4pcs 20 MB
4MB x 8 / 9 4pcs 16 MB
4MB x 8 / 9 4pcs 4MB x 8 / 9 4pcs 32 MB
256KB x 8 / 9 4pcs 1MB x 8 / 9 4pcs 5 MB
256KB x 8 / 9 4pcs 4MB x 8 / 9 4pcs 17 MB
256KB x 8 / 9 4pcs 16MB x 8 / 9 4pcs 65 MB
1MB x 8 / 9 4pcs 16MB x 8 / 9 4pcs 68 MB
4MB x 8 / 9 4pcs 16MB x 8 / 9 4pcs 80 MB
16MB x 8 / 9 4pcs 64 MB
16MB x 8 / 9 4pcs 16MB x 8 / 9 4pcs 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.

3.5.SRAM INSTALLATION AND JUMPERS SETUP

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GA-486VF / VS
________________________________________________________________

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 or
32Kx8-15 ns , and the DATA SRAM type is 8Kx8-15 ns, 32Kx8-15 ns 64Kx8­20ns or 128Kx8-20 ns.

The mainboard can be installed 64, 128, 256 or 512 KB cache memory when
using 8Kx8 or 32Kx8 type DATA SRAM separately. Please refer to the following
table to install cache memory system :

SRAM Size Data SRAM Tag SRAM IC U. No. JP1 JP2 JP3 JP4
64 KB 8 KB x 8 8 KB x 8 All (8 PCs.) OFF OFF OFF
128 KB 32 KB x 8 8 KB x 8 U1, U2, U3, U4 ON OFF OFF 1-2
256 KB 32 KB x 8 16 / 32 KB x 8 All (8 PCs.) ON ON OFF 2-3
256 KB 64 KB x 8 16 / 32 KB x 8 U1, U2, U3, U4 ON ON OFF 1-2
512 KB 128 KB x 8 32 KB x 8 U1, U2, U3, U4 ON ON ON 1-2

3.6.CPU INSTALLATION AND JUMPERS SETUP

The system's speed depends on the frequency of CLOCK GENERATOR. The
user can change the JUMPER (JP5 ~ JP7) selection to set up the system speed
to 25 MHz, 33 MHz ,40 MHz and 50 MHz for different CPU speed.

The mainboard can use 80486DX, DX2, SX, OverDrive, P24T 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 correctly install the CPU and jumpers setup:

CPU Type Clock Gen. CPU JP5 JP6 JP7
486SX-25 25 MHz 25 MHz OFF OFF ON
487SX-25 25 MHz 25 MHz OFF OFF ON
486DX-25 25 MHz 25 MHz OFF OFF ON
S-Series 25 MHz 25 MHz OFF OFF ON
486DX2-50 25 MHz 50 MHz OFF OFF ON
OverDrive 25 MHz 50 MHz OFF OFF ON
DX4 25 MHz 75 MHz OFF OFF ON
486SX-33 33.3 MHz 33.3 MHz ON ON ON
487SX-33 33.3 MHz 33.3 MHz ON ON ON
486DX-33 33.3 MHz 33.3 MHz ON ON ON
S-Series 33.3 MHz 33.3 MHz ON ON ON
486DX2-66 33.3 MHz 66.6 MHz ON ON ON

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20

Hardware Installation

________________________________________________________________

OverDrive 33.3 MHz 66.6 MHz ON ON ON
DX4 33.3 MHz 100 MHz ON ON ON
486DX-40 40 MHz 40 MHz OFF ON ON
486SX-40 40 MHz 40 MHz OFF ON ON
486DX-50 50 MHz 50 MHz ON OFF OFF
DX4 40 MHz 80 MHz OFF ON ON

There is a jumper, JP11, to control the AMD CPU installed or not. Open JP11 if
an AMD CPU is installed, otherwise Close this jumper.

JP36 and JP37 are used to select the 3.3 V or 5 V of CPU voltage. If the DX4
CPU is used, both jumpers are opened. Otherwise, both jumpers are closed.

The DX4 CPU has two types of internal CPU speed. One is double speed and
the other is triple speed. If a double speed DX4 CPU is selected, close JP24
jumper. If a triple speed DX4 CPU is selected, open JP24 jumper.

M

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.

M

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!

M

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.

3.7.EXT. POWER CONTROL PORT

When the system enter Power Down mode (timer is time-out), the JP33 pin 1 will
change to low level from high level. When system is waked up (return to normal
mode), the pin 1 will return to high level. The jumper is used to connect to the
Green Function Power Supply for Monitor Power ON/OFF control.

3.8.CMOS BATTERY JUMPER SETUP

There're RTC & CMOS memories on board, so they need a power supply from
battery to keep the data inviolate & effective. The RTC is a Real-Time Clock

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GA-486VF / VS
________________________________________________________________

device which provides the Date & Time to system. The CMOS memory is used
for keeping the information of system configuration, so the system can
automatically boot O. S. every time.

There is a re-chargeable battery on board, also there is an external battery
connector on board. The user can close jumper JP16 pin 1-2 to use re­chargeable battery, or add an external battery to mainboard by connect it to J1.

The re-chargeable battery is automatically re-charged when the system is
powered-on (JP16 pin 1-2 close), and provides the power when the system is
powered-off. Before having a long distance transportation or not using system
for a long time, closing the jumper JP16 pin 2-3 is recommended for saving
power and extending the life of re-chargeable battery.

Due to the life-time of re-chargeable battery is 5-7 years, the user can use
external battery to replace re-chargeable battery after it can not work. The 6V or

4.5V external battery is recommended to be used in system.

For some reasons (ex. lost password), the user can close the jumper JP16 pin 2­3 or disconnect the external battery connector to clear CMOS memory's data
values. After this, the user must wait for a few minutes to let the remain power in
CMOS discharge and then close the jumper JP16 pin 1-2 or connect external
battery again to let it work normally.

3.9.SPEAKER CONNECTOR INSTALLATION

There is always a speaker in AT system for sound purpose. The 4-Pins
connector J5 is used to connect speaker. The speaker can work well in both
direction of connector when it is installed to the connector J8 on mainboard.

3.10.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

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22

Hardware Installation

________________________________________________________________

input or unlock it, both of them are connected to a 5 PIN connector. The
connector should be installed to J7 of mainboard in correct direction.

3.11.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 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.

3.12.TURBO LED CONNECTOR INSTALLATION

The TURBO LED on panel can indicate the current speed status of system. The
TURBO LED connector should be installed to J4 in correct direction.

3.13.HARDWARE 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 by user. The Reset switch is a 2 PIN
connector and should be installed to J6 on mainboard.

3.14.GREEN FUNCTION INSTALLATION

For the purpose of power saving, there are two jumpers, JP34 and JP26, to
make sure the power saving function doing well. The JP34 is a indicator (green

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GA-486VF / VS
________________________________________________________________

LED) for green function. If the green LED is ON, the system is operating in green
mode. The JP26 is a switch to force the system get into green mode
immediately.

3.15.PERIPHERAL DEVICE INSTALLATION

After the device installation and jumpers setup, the mainboard can be mounted
into the case and fixed by screw. To complete the mainboard installation, the
peripheral device could be installed now. The basic system needs a display
interface card and a disk control interface card.

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

After installing the peripheral device, the user should check everything again,
and prepare to power-on the system.

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24

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.

l 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,

l 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

Status Page Setup Menu and Option Page Setup Menu - Exit

current page and return to Main Menu
PgUp key Increase the numeric value or make changes
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GA-486VF / VS
________________________________________________________________

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

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

Option Page Setup Menu
F7 key Load the default
F8 key Reserved
F9 key Reserved
F10 key Save all the CMOS changes, only for Main Menu

4.3.GETTING HELP

4.3.1.Main Menu

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

4.3.2.Status 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 highlighted item. To exit the Help
Window press <Esc>.

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BIOS Configuration

ROM ISA BIOS ( 2C4I8G01 )

________________________________________________________________

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 seven setup
functions and two exit choices. Use arrow keys to select among the items and
press <Enter> to accept or enter the sub-menu.

Figure 1: Main Menu

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

LOAD BIOS DEFAULTS

LOAD SETUP DEFAULTS

ESC

: Save & Exit Setup

F10 : Quit

Time, Date, Hard Disk Type, ...

PASSWORD SETTING

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

(Shift)F2

l Standard CMOS setup

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

: Select Item
: Chang Color

l BIOS features setup

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

l Chipset features setup

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

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GA-486VF / VS
________________________________________________________________

l Power Management Setup

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

l Load BIOS Defaults

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

l Load SETUP Defaults

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

l Password setting

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

l IDE HDD auto detection

Automatically configure hard disk parameter.

l Save & exit setup

Save CMOS value changes to CMOS and exit setup.

l Exit without save

Abandon all CMOS value changes and exit setup.

4.5.STANDARD CMOS SETUP MENU

The items in Standard CMOS Setup Menu (Figure 2) are divided into 9
categories. Each category includes no, 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.

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28

BIOS Configuration

ROM ISA BIOS ( 2C4I8G01 )

________________________________________________________________

Figure 2: Standard CMOS Setup Menu

STANDARD CMOS SETUP

AWARD SOFTWARE, INC.

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

Drive C

Drive A
Drive B

Video

Halt On : All Errors

ESCF1: Quit

: Help (Shift)F2

: 1 (10Mb)
: None (0 Mb)Drive D

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

: EGA/VGA

: Tri, Jan 28 1994
: 11 : 27 : 49

CYLS. HEADS PRECOMP LANDZONE SECTORS

306 4 128 305 17

Base Memory:

Extended Memory:

Expanded Memory:

Other Memory:

Total Memory:

: Select Item

: Chang Color

l Date

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

0000 0

640 K

7168 K

0 K

384 K

8192 K

PU/PD/+/- : Modify
F3 : Taggle Calender

day The day, from Sun to Sat, determined by the BIOS and is display-only
date The date, from 1 to 31 (or the maximum allowed in the month)
month The month, Jan. through Dec.
year The year, from 1900 through 2099

l 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.

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GA-486VF / VS
________________________________________________________________

l Drive C type / Drive D type

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

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
LANDZONE landing zone
SECTORS number of sectors

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

l 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. 5-1/4 inch PC-type standard drive; 360 kilobyte capacity

1.2M, 5.25 in. 5-1/4 inch AT-type high-density drive; 1.2 megabyte capacity
720K, 3.5 in. 3-1/2 inch double-sided drive; 720 kilobyte capacity

1.44M, 3.5 in. 3-1/2 inch double-sided drive; 1.44 megabyte capacity

2.88M, 3.5 in. 3-1/2 inch double-sided drive; 2.88 megabyte capacity

________________________________________________________________

30

BIOS Configuration

________________________________________________________________

l Video

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

EGA/VGA Enhanced 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 column mode
MONO Monochrome adapter, includes high resolution monochrome adapters

l 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 be stopped for any error that may be detected
All,
But Keyboard
All, But Diskette The system boot will not stop for a disk error; it will stop for all other

All, But Disk/Key The system boot will not stop for a keyboard or disk error; it will stop for

The system boot will not stop for a keyboard error; it will stop for all

other errors

errors

all other errors

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

Extended Memory

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31

GA-486VF / VS
________________________________________________________________

The BIOS determines how much extended memory is present 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 640 K, the Expanded
Memory Specification (EMS) swaps memory which not utilized by DOS with a section, or
frame, so these applications can access all of the system memory. Memory can be swapped by
EMS is usually 64 K within 1 MB or memory above 1 MB, depends 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 640 K to 1024 K address space. This is 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.

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32

BIOS Configuration

________________________________________________________________

4.6.BIOS FEATURES SETUP

ROM ISA BIOS ( 2C4I8G01 )

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
Turbo SW Function Enable :Yes

: Disabled
: Enabled
: Enabled

: A, C

: Enabled
: On
: Disabled

l Security Option

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

ESC

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

: Enabled
: Disabled
: Disabled
: Disabled

PU/PD/+/­(Shift)F2

: Select Item
: Modify
: Color

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

l 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. Default
value is Disabled.

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GA-486VF / VS
________________________________________________________________

Enabled Activate automatically when the system boots up causing a warning message to

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

Disabled No warning message to appear when anything attempts to access the boot sector or

hard disk partition table

l 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

l 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

l Boot Sequence

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

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

l 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

l Boot Up Floppy Seek

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

Enabled BIOS searches for floppy disk drive to determine if it is 40 or 80 tracks, Note that

________________________________________________________________

34

BIOS Configuration

________________________________________________________________

BIOS can not tell from 720 K, 1.2 M or 1.44 M drive type as they are all 80 tracks

Disabled BIOS will not search for the type of floppy disk drive by track number. Note that

there will not be any warning message if the drive installed is 360 K

l Boot Up NumLock Status

The default value is On

On Keypad is number keys
Off Keypad is arrow keys

l IDE HDD Block Mode

The default value is Disabled.

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

l Turbo SW Function Enable

The default value is Yes

Yes Change system speed by Turbo SW immediately when system boot up.
No Change system speed by keyboard immediately when system boot up.

¬ This option is valid from BIOS DATE CODE Apr. 16, 1994 or later.

l 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

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35

GA-486VF / VS

ROM ISA BIOS ( 2C4I8G01 )

________________________________________________________________

l C8000 - CFFFF Shadow / D0000 - DFFFF Shadow

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

Enabled Optional shadow is enabled
Disabled Optional shadow is disabled

4.7.CHIPSET FEATURES SETUP

CHIPSET FEATURES SETUP

AWARD SOFTWARE, INC.

Auto Configuration
AT Bus Clock
DRAM Speed
Cache Burst Read
Cache Write Cycle
Latch Local Bus
Slow Refresh
Hidden Refresh
External Cache WB/WT
Internal Cache WB/WT
System Shadow
Video Shadow
Memory Hole Size : None
256KB Remap Function : Enable

: Enabled
: 1/5 CLKIN
: Faster
: 1W
: 1W
: T3
: Disabled
: Enabled
: Write Back
: Write Thru
: Cacheable
: Cacheable

l Auto Configuration

The default value is Enabled.

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

ESC

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

PU/PD/+/­(Shift)F2

: Select Item
: Modify
: Color

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36

BIOS Configuration

________________________________________________________________

l AT Bus Clock

1/3 CLKIN For 25 MHz system.
1/4 CLKIN For 33 MHz system.
1/5 CLKIN For 40 MHz system.
1/6 CLKIN For 50 MHz system.

l DRAM Speed

Faster For 40 MHz or 50 MHz system.
Fastest For 25 MHz or 33 MHz system.

l Cache Burst Read

0W For 25 MHz or 33 MHz system.
1W For 40 MHz, 50 MHz or one bank cache installed system.

l Cache Write Cycle

0W For 25 MHz or 33 MHz system.
1W For 40 MHz, 50 MHz or one bank cache installed system.

l Latch Local Bus

T2 For 25 MHz or 33 MHz system.
T3 For 40 MHz or 50 MHz system.

l Slow Refresh

The default value is Disabled.

Enabled Enable Slow Refresh function.
Disabled Disable Slow Refresh function.

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37

GA-486VF / VS
________________________________________________________________

l Hidden Refresh

The default value is Enabled.

Enabled Enable Hidden Refresh function.
Disabled Disable Hidden Refresh function.

l 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.

l 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.

l System Shadow

The default value is Cacheable.

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

l Video Shadow

The default value is Cacheable.

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

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38

BIOS Configuration

ROM ISA BIOS ( 2C4I8G01 )

________________________________________________________________

l Memory Hole Size

None System doesn't assign any memory below 16 MB to AT Bus.
1 MB System assign 1 MB memory size below 16 MB to AT Bus.
2 MB System assign 2 MB memory size below 16 MB to AT Bus.
4 MB System assign 4 MB memory size below 16 MB to AT Bus.

l 256KB Remap Function

The default value is Enabled.

Enable When DRAM size is 1, 2, 4, 5, 6 or 8MB, the extend memory will increase 256KB

if the memory block D0000~EFFFF is not occupied by shadow function or SMM
mode.

Disable Disable 256KB Memory Remap function.

¬ This options is valued from BIOS Date Code 03/25/94.

4.8.POWER MANAGEMENT SETUP

POWER MANAGEMENT SETUP

AWARD SOFTWARE, INC.

Green Function
Green Timer : 3 Min VGA Adaptor Type : Non-Green
HDD Power Down
Monitor Local Device
Monitor Video Action : Enable
Monitor IRQ5
Monitor IRQ7
Monitor IRQ9
Monitor IRQ10
Monitor IRQ12

: Enable

: Disable
: Enable

: Disable
: Disable
: Disable
: Disable
: Disable

PM Control by APM

O.S. : ALL O.S.

: Quit

F1

: Help

F5

: Old Values

F6

: Load BIOS Defaults

F7 : Load Setup Defaults

PU/PD/+/­(Shift)F2

: No

: Modify
: Color

l Green Function

Enable Enable Green function.
Disable Disable Green function.

: Select ItemESC

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39

GA-486VF / VS
________________________________________________________________

l Green Timer

Disable Disable System's Green Timer function.
10 secs ­3 hours

Enable System's Green Timer function between 10 seconds to 3 hours.

l HDD Power Down

Disable Disable HDD Power Down mode function.
1 - 15 Mins Enable HDD enter Power Down mode between 1 to 15 mins.
When Suspend The HARD DISK will be forced to Power Down when system get into

Green Mode.
(This function is valid from BIOS DATE CODE Apr. 16, 1994 or
later.)

¬ If your system have any problem using some of the HARD DISKS when

enable HDD Power Down function, please disable this function.

l Monitor Local Device, Video Action, IRQ5 ~ IRQ12

The system get into green mode or not depending on the status of Local Device, Video Action or
IRQ5 ~ IRQ12.

Enable System will not get into green mode when Local Device, Video Action or IRQ5 ~

IRQ12 is activity.

Disable System will get into green mode no matter what Local Device, Video Action or

IRQ5 ~ IRQ12 is activity or not.

l PM Control by APM

This category can be accessed while S-Series CPU installed.

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

into Green mode.

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

get into Green mode.

l VGA Adaptor Type

This category can be accessed while S-Series CPU installed.

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

monitor power saving.

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

l O.S.

Support Intel Non-S & AMD & CYRIX CPU to close monitor in DOS system.

ALL O.S. don't close monitor in all O.S.
DOS ONLY15 use IRQ15 to close monitor in DOS system only.
DOS ONLY12 use IRQ12 to close monitor in DOS system only.

¬ Don't select DOS ONLY15 or ONLY12 if your O.S. is Non-DOS system.

(For example OS/2, Unix or Novell)

4.9.LOAD BIOS DEFAULTS

________________________________________________________________

40

BIOS Configuration

________________________________________________________________

ROM ISA BIOS ( 2C4I8G01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEM

LOAD BIOS DEFAU

LOAD SETUP DEFAULTS

ESC

: Save & Exit Setup

F10 : Quit

Load SETUP Defaults except Standard CMOS SETUP

Load BIOS Defaults (Y/N)? N

PASSWORD SETTING

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

(Shift)F2

: Chang Color

l Load BIOS Defaults

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

OUT SAVING

: Select Item

M If there is any problem occurred, loading BIOS DEFAULTS step is recommended.

________________________________________________________________

41

GA-486VF / VS

ROM ISA BIOS ( 2C4I8G01 )

________________________________________________________________

4.10.LOAD SETUP DEFAULTS

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEM

LOAD BIOS DEFAU

LOAD SETUP DEFAULTS

ESC

: Save & Exit Setup

F10 : Quit

Load SETUP Defaults except Standard CMOS SETUP

Load SETUP Defaults (Y/N)? N

PASSWORD SETTING

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

(Shift)F2

: Chang Color

l Load Setup Defaults

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

OUT SAVING

: Select Item

________________________________________________________________

42

BIOS Configuration

ROM ISA BIOS ( 2C4I8G01 )

________________________________________________________________

4.11.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.

ENTER PASSWORD

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEM

LOAD BIOS DEFAU

LOAD SETUP DEFAULTS

ESC

: Save & Exit Setup

F10 : Quit

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 enter a

Enter Password:

Change / Set / Disabled Password

PASSWORD SETTING

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

OUT SAVING

: Select Item

(Shift)F2

: Chang Color

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

________________________________________________________________

43

GA-486VF / VS
________________________________________________________________

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.

4.12.IDE HDD AUTO DETECTION

ROM ISA BIOS ( 2C4I8G01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

CYLS. HEAD PRECOMP LANDZONE SECTORS

Drive C: (202 Mb) 989 12 65535 988 35

Do you accept this drive C (Y/N)? N

ESC

: Skip

Type "Y" will accept the H.D.D. parameter reported by BIOS. Type "N" will keep the old H.D.D.
parameter setup.

________________________________________________________________

44

BIOS Configuration

________________________________________________________________

4.13.SAVE & EXIT SETUP

ROM ISA BIOS ( 2C4I8G01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEM

LOAD BIOS DEFAU

LOAD SETUP DEFAULTS

ESC

: Save & Exit Setup

F10 : Quit

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

Save Data to CMOS & Exit SETUP

PASSWORD SETTING

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

OUT SAVING

(Shift)F2

: Select Item

: Chang 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.

________________________________________________________________

45

GA-486VF / VS
________________________________________________________________

4.14.EXIT WITHOUT SAVING

ROM ISA BIOS ( 2C4I8G01 )

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEM

LOAD BIOS DEFAU

LOAD SETUP DEFAULTS

ESC

: Save & Exit Setup

F10 : Quit

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

Quit Without Saving (Y/N)? N

Abandom all Data & Exit SETUP

PASSWORD SETTING

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

OUT SAVING

(Shift)F2

: Select Item

: Chang Color

4.15.KEYBOARD 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 to

WARM START (Soft Reset).

"CTRL_ALT_[+]" Pressing these keys simultaneously will change the

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

"CTRL_ALT_[-]" Pressing these keys simultaneously will change the

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

________________________________________________________________

46

AT Technical Information

________________________________________________________________

5.AT TECHNICAL INFORMATION

5.1.I/O BUS CONNECTOR PIN OUT

5.1.1.ISA 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

________________________________________________________________

47

GA-486VF / VS
________________________________________________________________

5.1.2.VL-BUS SLOT PIN OUT

B01

DAT00
DAT02
DAT04
DAT06
DAT08

GND
DAT10
DAT12

VCC
DAT14
DAT16
DAT18
DAT20

GND
DAT22
DAT24
DAT26
DAT28
DAT30

VCC

ADR31

GND
ADR29
ADR27
ADR25
ADR23
ADR21
ADR19

VCC
ADR17
ADR15

VCC
ADR13
ADR11
ADR09
ADR07
ADR05

VCC
ADR03
ADR02

N/C

RESET#

D/C#

M/IO#

W/R#

A01

B02

A02

B03

A03

B04

A04

B05

A05

B06

A06

B07

A07

B08

A08

B09

A09

B10

A10

B11

A11

B12

A12

B13

A13

B14

A14

B15

A15

B16

A16

B17

A17

B18

A18
B19A19
B20

A20
B21

A21
B22

A22
B23

A23
B24

A24
B25

A25
B26

A26
B27

A27
B28

A28
B29

A29
B30

A30
B31

A31
B32

A32
B33

A33
B34

A34
B35

A35
B36

A36
B37

A37
B38

A38
B39

A39
B40

A40
B41

A41
B42

A42
B43

A43
B44

A44
B45

A45

DAT01
DAT03
GND
DAT05
DAT07
DAT09
DAT11
DAT13
DAT15
GND
DAT17
VCC
DAT19
DAT21
DAT23
DAT25
GND
DAT27
DAT29
DAT31
ADR30
ADR28
ADR26
GND
ADR24
ADR22
VCC
ADR20
ADR18
ADR16
ADR14
ADR12
ADR10
ADR08
GND
ADR06
ADR04
WBACK#
BE0#
VCC
BE1#
BE2#
GND
BE3#
ADS#

B48

A48

A49

A50

A51

A52

A53

A54

A55

A56

A57

A58

LRDY#
LDEV#
LREQ#
GND
LGNT#
VCC
ID2
ID3
ID4
LKEN#
LEADS#

RDYRTN#

GND
IRQ9

BRDY#

BLAST#

ID0
ID1

GND

LCLK

VCC

BS16#

B49
B50
B51
B52
B53
B54
B55
B56
B57
B58

________________________________________________________________

48

AT Technical Information

________________________________________________________________

5.2.I/O & MEMORY MAP

MEMORY MAP: [0000000-009FFFF] System memory used by DOS and application program.

[00A0000-00BFFFF] Display buffer memory for VGA/ EGA/CGA/MONOCHROME

adapter.
[00C0000-00DFFFF] Reserved for I/O device BIOS ROM or RAM buffer.
[00E0000-00EFFFF] Reserved for PCI device ROM.
[00F0000-00FFFFF] System BIOS ROM.
[0100000-BFFFFFF] System extension memory.

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

[020-021] INTERRUPT controller.(Master)
[022-023] CHIPSET control registers I/O ports.
[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.

5.3.TIMER & DMA CHANNELS MAP

TIMER MAP: TIMER Channel-0 System timer interrupt

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

DMA CHANNELS: DMA Channel-0 Available

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

________________________________________________________________

49

GA-486VF / VS
________________________________________________________________

5.4.INTERRUPT MAP

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

1 KEYBOARD output buffer full
2 Cascade for IRQ 8-15
3 SERIAL port 2
4 SERIAL port 1
5 PARALLEL port 2
6 FLOPPY DISK adapter
7 PARALLEL port 1
8 RTC clock
9 Available
10 Available
11 Available
12 Available
13 MATH coprocessor
14 HARD DISK adapter
15 Available

________________________________________________________________

50

AT Technical Information

________________________________________________________________

5.5.RTC & CMOS RAM MAP

RTC & CMOS: 00 Seconds

01 Second alarm
02 Minutes
03 Minutes alarm
04 Hours
05 Hours alarm
06 Day of week
07 Day of month
08 Month
09 Year
0A Status register A
0B Status register B
0C Status register C
0D Status register D
0E Diagnostic status byte
0F Shutdown byte
10 FLOPPY DISK drive type byte
11 Reserve
12 HARD DISK type byte
13 Reserve
14 Equipment byte
15 Base memory low byte
16 Base memory high byte
17 Extension memory low byte
18 Extension memory high byte
19-2d
2E-2F
30 Reserved for extension memory low byte
31 Reserved for extension memory high byte
32 DATE CENTURY byte
33 INFORMATION FLAG
34-3F Reserve
40-7f Reserved for CHIPSET SETTING DATA

________________________________________________________________

51

GA-486VF / VS
________________________________________________________________

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-ALT­ESC OR DEL TO ENTER SETUP will be shown in the information box at the
bottom.

l 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.

l 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 become
corrupt. This error may have been caused by a weak battery. Check the
battery and replace 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.

________________________________________________________________

52

Appendix A: Post Message

________________________________________________________________

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.

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 are no floppy drives installed, be sure
the Diskette Drive selection in Setup is set to NONE.

________________________________________________________________

53

GA-486VF / VS
________________________________________________________________

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 ...

Indicates an error verifying a value already written to memory. Use the
location along with your system's 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 that has caused the
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 that has caused the
problem has been isolated.

________________________________________________________________

54

Appendix A: Post Message

________________________________________________________________

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.

________________________________________________________________

55

GA-486VF / VS
________________________________________________________________

APPENDIX B: POST CODES

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

POST Name Description
C0 Turn Off Chipset

Cache

1 Processor Test 1 Processor Status (1 FLAGS) Verification.

2 Processor Test 2 Read/Write/Verify all CPU registers except SS, SP, and BP with data
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
E Test Video Memory Test video memory, write sign-on message to screen.
F Test DMA Controller 0 BIOS checksum test.

OEM Specific-Cache control.

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.

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_INT-HDLR 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.

________________________________________________________________

56

Appendix B: Post Codes

________________________________________________________________

Keyboard detect and initialization.
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 alternately turning off

16 Test 8259-2 Mask Bits Verify 8259 Channel 2 masked interrupts by alternately turning off
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

Test DMA Page Registers.

and on the interrupt lines.
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.

F This will be skipped in EISA mode and can be "skipped" with

ESC key in ISA mode.
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.
51 Pre-boot Enable Enable parity checker.

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

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.

F When FSCAN option is enabled, will initialize from C8000h to

F7FFFh.
53 Initialize Time Value Initialize time value in 40h: BIOS area.
60 Setup Virus Protect Setup virus protect according to Setup

________________________________________________________________

57

GA-486VF / VS
________________________________________________________________

61 Set Boot Speed Set system speed for boot
62 Setup NumLock Setup NumLock status according to Setup
63 Boot Attempt Set low stack.

Boot via INT 19h.
B0 Spurious If interrupt occurs in protected mode.
B1 Unclaimed NMI If unmasked NMI occurs, display

Press F1 to disable NMI, F2 reboot.
E1-EF Setup Pages E1 - Page 1, E2 - Page 2, etc.
FF Boot

________________________________________________________________

58

Appendix C: BIOS Default Drive Table

________________________________________________________________

APPENDIX C: BIOS DEFAULT DRIVE TABLE

Type Size (MB) Cylinders Heads Sectors Write /

Precomp

1 10 MB 306 4 17 128 305 TEAC SD510
2 20 MB 615 4 17 300 615 Seagate ST225, ST4026

3 31 MB 615 6 17 300 615
4 62 MB 940 8 17 512 940
5 47 MB 940 6 17 512 940
6 20 MB 615 4 17 65535 615 Seagate ST125

7 31 MB 462 8 17 256 511
8 30 MB 733 5 17 65535 733 Tandon TM703
9 112 MB 900 15 17 65535 901
10 20 MB 820 3 17 65535 820
11 35 MB 855 5 17 65535 855
12 50 MB 855 7 17 65535 855
13 20 MB 306 8 17 128 319 Disctron526,

14 43 MB 733 7 17 65535 733
16 20 MB 612 4 17 0 663 Microscience HH725

17 41 MB 977 5 17 300 977
18 57 MB 977 7 17 65535 977
19 60 MB 1024 7 17 512 1023
20 30 MB 733 5 17 300 732
21 43 MB 733 7 17 300 732
22 30 MB 733 5 17 300 733 Seagate ST4038
23 10 MB 306 4 17 0 336
24 54 MB 925 7 17 0 925 Seagate ST4051
25 69 MB 925 9 17 65535 925 Seagate ST4096
26 44 MB 754 7 17 754 754 Maxtor2085
27 69 MB 754 11 17 65535 754 Maxtor2140,

28 41 MB 699 7 17 256 699 Maxtor2190,
29 68 MB 823 10 17 65535 823 Maxtor1085
30 53 MB 918 7 17 918 918 Maxtor1105, 1120, 4780

31 94 MB 1024 11 17 65535 1024 Maxtor1170
32 128 MB 1024 15 17 65535 1024 CDC9415
33 43 MB 1024 5 17 1024 1024
34 10 MB 612 2 17 128 612
35 77 MB 1024 9 17 65535 1024
36 68 MB 1024 8 17 512 1024
37 41 MB 615 8 17 128 615
38 25 MB 987 3 17 987 987
39 57 MB 987 7 17 987 987 Maxtor1140, 4380
40 41 MB 820 6 17 820 820 Seagate ST251
41 41 MB 977 5 17 977 977 Seagate ST4053

42 41 MB 981 5 17 981 981 Miniscribe3053/6053 RLL

Land
Zone

Example Model

MMI 112, 5412

Tandon TM262

MMI M125

Syquest3250, 3425

Priam S14
Priam S19
Micropolis1325

Miniscribe3053/6053

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59

GA-486VF / VS
________________________________________________________________

43 48 MB 830 7 17 512 830 Miniscribe 3650
44 69 MB 830 10 17 65535 830 Miniscribe 3650 RLL
45 114 MB 917 15 17 65535 918 Conner CP3104
46 152 MB 1224 15 17 65535 1223 Conner CP3204
User

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60

Appendix D: Problem Sheet

________________________________________________________________

APPENDIX D: PROBLEM SHEET

1. Customer Data

Name Tel. No.
Address Fax. No.

Purchase Date

2. Mainboard Data

Model No. GA- Rev. No.
Serial No.

3. System Configuration

CPU Type:
CPU Brand:
CPU Speed:

DRAM Type:
DRAM Speed: q 80 q 70 q 60 ns

DRAM Total Size:
DRAM Brand:

SRAM Size: q 64 KB q 128 KB q 256 KB q 512 KB
SRAM Part No. TAG: DATA:

Video Card:
Video Chip or Brand:
Floppy Drive A Capacity & Brand:
Floppy Drive B Capacity & Brand:

Storage Controller Type q MFM q RLL q IDE q ESDI q SCSI
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. q DOS q OS/2 q NETWARE q UNIX / XENIX vER.:

4. AUTOEXEC.BAT & CONFIG.SYS File:

q 1 q 2 q 4 q 8 q 16 q 32 MB

MB

5. Problem Description:

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61