Gigabyte 686LX User Manual

GA - 686LX

USER'S MANUAL

Pentium II Processor MAINBOARD

REV. 1 First Edition

GA-686LX

2

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.

Third-party brands and names are the property of their respective
owners.

SEPTEMBER 03, 1997 Taipei, Taiwan

Table of Contents

3

TABLE OF CONTENTS

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

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

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

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

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

1.5. INTRODUCE THE Pentium II Processor................................................................1-3

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

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

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

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

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

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

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

3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS......................................3-2

3.4. DRAM INSTALLATION .............................................................................................3-4

3.5. CPU SPEED SETUP.................................................................................................3-5

3.6. CMOS RTC & ISA CFG CMOS SRAM.....................................................................3-5

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

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

3.9. POWER LED CONNECTOR INSTALLATION.........................................................3-6

3.10. GREEN LED INSTALLATION.................................................................................3-6

3.11. IDE & ATAPI DEVICE INSTALLATION..................................................................3-6

3.12. PERIPHERAL DEVICE INSTALLATION................................................................3-6

3.13. KEYBOARD & PS/2 MOUSE INSTALLATION.......................................................3-7

3.14. KEYBOARD SETTING FUNCTION........................................................................3-7

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

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

GA-686LX

4

4.2. CONTROL KEYS.......................................................................................................4-2

4.3. GETTING HELP........................................................................................................4-3

4.3.1. Main Menu ......................................................................................................4-3

4.3.2. Status Page Setup Menu / Option Page Setup Menu .....................................4-3

4.4. THE MAIN MENU......................................................................................................4-3

4.5. STANDARD CMOS SETUP MENU..........................................................................4-5

4.6. BIOS FEATURES SETUP.........................................................................................4-9

4.7. CHIPSET FEATURES SETUP .................................................................................4-13

4.8. POWER MANAGEMENT SETUP ............................................................................4-14

4.9. PNP/PCI CONFIGURATION.....................................................................................4-20

4.10. INTEGRATED PERIPHERALS...............................................................................4-22

4.11. LOAD SETUP DEFAULTS......................................................................................4-27

4.12. USER PASSWORD ................................................................................................4-28

4.13. IDE HDD AUTO DETECTION ................................................................................4-29

4.14. HDD LOW LEVEL FORMAT...................................................................................4-29

4.15. SAVE & EXIT SETUP..............................................................................................4-30

4.16. EXIT WITHOUT SAVING........................................................................................4-32

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

5.1. I/O BUS CONNECTOR PIN OUT.............................................................................5-1

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

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

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

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

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

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

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

Table of Contents

5

APPENDIX E: FCC DOCUMENT........................................................................................E-1

Introduction

1-1

1. INTRODUCTION

1.1. PREFACE

Welcome to use the GA - 686LX motherboard. The motherboard is a
Pentium II Processor based PC / AT compatible system with AGP / PCI /

ISA Bus, and has been designed to be the fastest PC / AT system. 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 Intel Pentium



II Processor based PC / AT compatible mainboard.

q Slot 1 supports Pentium



II processor running at 233-633 MHz.

q Intel 440LX chipset, Support AGP / SDRAM / Ultra DMA/33 IDE / ACPI

features.

q Support CPU FAN Failure / Overheat Alarm & auto slow down CPU

speed.

q Support Intel LDCM



Network Manageability.

q Supports 4xDIMMs using 3.3V EDO or SDRAM DIMM module.
q Supports 8 MB - 1 GB EDO / 512MB SDRAM memory on board.
q Supports ECC or Non-ECC type DRAM module.
q 1xAGP slot, 4xPCI Bus slots, 3xISA Bus slots.
q Supports 2 channels Ultra DMA/33 IDE ports for 4 IDE Device.
q Supports 2xCOM (16550), 1xLPT (EPP / ECP), 1x1.44MB Floppy port.
q Supports 2xUSB ports, 1xPS/2 Mouse & 1xPS/2 Keyboard ports.
q Licensed AWARD BIOS, 2M bit FLASH RAM.

GA-686LX

1-2

q ATX form factor, Double stack I/O connector, 4 layers PCB.

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 Hardware &
Software configuration will result in different benchmark testing results.)

• CPU

Pentium II processor

• DRAM 64 MB SDRAM

• CACHE SIZE 512 KB included in CPU

• DISPLAY Matrox Millennium II 4MB PCI VGA

• STORAGE Onboard IDE port

• O.S. Windows95 OSR2.0.

• DRIVER Display Driver at 1024 x 768 x 64K colors x 75Hz.

Triones Bus Master IDE Driver 3.60K

Processor

Intel Pentium II

266MHz 300MHz

Winbench97

CPU mark32 697 783

Business Disk 2210 2260

Hi-End Disk 5890 6490

Business Graphic 116 127

Hi-End Graphic 50.8 56.3

Winstone 97

Business 62 64.9

Introduction

1-3

14.318MHz

66MHz
66MHz

8MHz

ISA Slots

3.3V EDO/SDRAM

Floppy Port

Hi-End 30.6 32.6

1.4. BLOCK DIAGRAM

14.318MHz
66MHz

24MHz

Ultra DMA/33

IDE Bus

PCI Bus

66MHz

AGP

PCI Bus

33MHz

33MHz
33MHz

14.318MHz
48MHz

ISA Bus

AGP Bus

LPT Port

USB #2

PS/2 Keyboard

COM Ports

USB #1

DRAM Bus

SLOT1

PS/2 Mouse

USB Bus

Host Bus

PAC

82443LX

CHIPSET

PIIX4

82371AB

CHIPSET

I/O

8661

CIPSET

KBC

8042

CLOCK

GEN

SC652EY

B

GA-686LX

1-4

1.5. INTRODUCE THE Pentium II Processor & AGP

Figure 1:Retention Mechanism & attach Mount

Figure 2:OEM Pentium II Processor

Introduction

1-5

Figure 3:Heatsink / FAN & Heat sink support for OEM Pentium II Processor

Figure 4:Boxed Pentium II Processor & Heat sink support

GA-686LX

1-6

What is AGP

?

The Accelerated Graphics Port (AGP) is a new port on the Host-To-PCI
bridge device that supports an AGP port. The main purpose of the AGP port
is to provide fast access to system memory.

The AGP port can be used either as fast PCI port (32-bit at 66MHz vs. 32-bits
at 33MHz) or as an AGP port which supports 2x data-rate, a read queue, and
side band addressing. When the 2x-data rate is used the port can transmit
data at 533Mb/sec (66.6*2*4). The read-queue can be used to pipeline
reads – removing the effects of the reads-latency. Side band addressing can
be used to transmit the data address on a separate line in order to further
speed the transaction.

Specification

2-1

2. SPECIFICATION

2.1. HARDWARE

• CPU

− Pentium



II processor 233 – 633 MHz.

− 242 pins 66MHz slot1 on board.

• PROTECTION

− Onboard Buzzer Alarm when detect "CPU FAN

Failure" or “CPU Overheat” .

− Automatically slow down CPU speed when "CPU

FAN Failure" or "CPU Overheat".

− Intel LDCM



support.

− H/W monitor power status (±5V, ±12V, CPU

voltage & CMOS battery voltage).

• SPEED

− 66 MHz system speed.

− 66 MHz AGP bus speed. (133MHz 2*mode)

− 33 MHz PCI-Bus speed.

− 8 MHz AT bus speed.

• DRAM MEMORY

− 4 banks 168 pins DIMM module sockets on board.

− Use 8 / 16 / 32 / 64 / 128 / 256 MB 60~70 ns DIMM

module DRAM.

− 8 ~ 1 GB DRAM size.

− Support 3.3V SDRAM / EDO type DRAM.

− Support ECC or Non-ECC type DRAM.

• CACHE MEMORY

− 32 KB 1st cache memory included in CPU.

− 256KB/512 KB 2nd cache in CPU.

− Support DIB speed mode for L2 Cache.

− 1 66MHz / 133MHz AGP bus.

• I/O BUS SLOTS

− 4 33MHz Master / Slave PCI-BUS.

− 3 8MHz 16 bits ISA BUS.

• IDE PORTS

− 2 Ultra DMA/33 Bus Master IDE channels on

board.(Using IRQ14,15)

− Back ward Support Mode 3,4 IDE & ATAPI CD -

ROM.

GA-686LX

2-2

• I/O PORTS

− Supports 2 16550 COM ports. (Using IRQ4, 3)

− Supports 1 EPP/ECP LPT port. (Using IRQ7 or 5

and DMA3 or 1)

− Supports 1 1.44/2.88 MB Floppy port. (Using DMA2

& IRQ6)

− Supports 2 USB ports.

− Supports PS/2 Mouse. (Using IRQ12 )

− Supports PS/2 Keyboard. (Using IRQ1 )

• GREEN FUNCTION

− Suspend mode support.

− Green switch & LED support.

− IDE & Display power down support.

− Monitor all IRQ / DMA / Display / I/O events.

• BIOS

− 256KB FLASH EEPROM.

− Supports Plug & Play, DMI, ACPI Function.

• DIMENSION

− ATX Form Factor, 4 layers PCB.

2.2. SOFTWARE

• DRIVER

− Intel LDCM



optional.

− Health monitor Utility.

− Bus Master IDE Driver

• BIOS − Licensed AWARD BIOS.

− AT CMOS Setup, BIOS / Chipset Setup, Green

Setup, Hard Disk Utility included.

− Monitor Health status.

• O.S.

− Operation with MS-DOS



, Windows95,

WINDOWS NT, OS/2, NOVELL and 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.

− Max. 20A current at 5V.

Hardware Installation

3-1

3. HARDWARE INSTALLATION

3.1. UNPACKING

The mainboard package should contain the following:

• The GA - 686LX mainboard.

• The Retention Mechanism & Attach Mount

• USER'S MANUAL for mainboard.

• Cable set for IDE & Floppy device.

• Diskette or CD for Mainboard Utility.

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 ATX system board. It is assumed that the
chassis is designed for a standard ATX mainboard mounting.

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

GA-686LX

3-2

separate.

3.2. MAINBOARD LAYOUT

SLOT6

PCI1PCI2PCI3PCI4

COMA COMB

LPT

USB

KB

Mouse

ATX
POWER1

1

2

3

4

S1

BIOS

RESET HD-LED GN-SW

CN6
CN7 IDE1

IDE2

CN8FLOPPY

CN1 CN2

CN3 CN4 CN5

J2

DIMM1

DIMM2

DIMM3

DIMM4

Bank 1
Bank 0

371AB

PIIX4

FAN POWER

BUZZER1

J1

AGP1

BAT1

SLOT4 SLOT2

GA-686LX

HT1

JP2

Bank 3
Bank 2

J3 J1 J5 J6 J7 J8 J9

IR PWR-ON

SPEAKER

PWR-LED

×Figure 3.1Ø

3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS

t CN1-8 I/O Ports Connector

CN1 For Serial port1 (COM A).
CN2 For Serial port2 (COM B).
CN3 For LPT port.
CN4 USB port.
CN5 For Keyboard I/O port.
CN5 For PS/2 Mouse port.
CN6 For Secondary IDE port.
CN7 For Primary IDE port.
CN8 For Floppy port

t J1: slot1

Hardware Installation

3-3

For Pentium II processor installed.

t J2: CPU cooling FAN Power Connector

Pin No. Function

1 GND.
2 +12V
3 SENSE

t J3: SPEAKER Connector

Pin No. Function

1 VCC
2 NC.
3 NC.
4 Output

t J4: RESET Switch

Pin No. Function

1 RESET Input
2 GND

t J5: POWER ON LED (PW-LED)

Pin No. Function

1 LED POWER (+)
2 NC
3 GND (-)

t J6: Hard Disk active LED (HD-LED)

Pin No. Function

1 LED POWER (+)
2 LED POWER (-)
3 NC
4 LED POWER (+)

t J7: INFRARED Connector (IR) -- Function Option

Pin No. Function

1 IR Data Output
2 GND
3 IR Data Input
4 NC

GA-686LX

3-4

5 POWER (+)

t J8: GN-SW

On – Off for enter suspend Green Mode.

t J9: Soft Power Switch

On – Off for POWER ON or Suspend IN / OUT.
On 4 sec. For POWER OFF before VGA Enable or CMOS setup select
“delay 4sec.” For POWER OFF mode.

t J10: Green LED

OFF Normal mode

ON Suspend mode

t S1: CPU INT. / EXT. FREQ. RATIO

CPU TYPE 1 2 3 4 CLK RATIO

200MHz OFF ON OFF OFF X3
233MHz ON ON OFF OFF X3.5
266MHz OFF OFF ON OFF X4
300MHz ON OFF ON OFF X4.5
333MHz OFF ON ON OFF X5
366MHz ON ON ON OFF X5.5

t POWER1: ATX POWER connector

Pin No. Function

3,5,7,13,15-17GND

4,6,19,20 VCC (+5V)

10 +12V
12 -12V
18 -5V

8 Power Good
9 5V SB (Stand by +5V)

14 PS-ON (Soft ON/OFF)

3.4. DRAM INSTALLATION

The mainboard can be installed with 4 / 8 / 16 / 32 / 64 / 128 / 256 MB 168
pins DIMM module DRAM, and the DRAM speed must be 50 or 60 ns for

Hardware Installation

3-5

EDO & 67~100 MHz for SDRAM. The DRAM memory system on mainboard
consists of bank 0, 1, 2 & bank 3. Each bank consists of 3 PCS 168 pins
DIMM module DRAM.
Because the 168 pins DIMM module is 64 bits width, using 1 PCS which can
match a 64 bits system. The total memory size is 8 MB ~ 1 GB EDO /
512MB SDRAM. The DRAM installation position refer to Figure 3.1, and
notice the Pin 1 of DIMM module must match with the Pin 1 of DIMM socket.
Insert the DRAM DIMM module into the DIMM socket at Vertical angle. If
there is a wrong direction of Pin 1, the DRAM DIMM module couldn't be
inserted into socket completely.

3.5. CPU SPEED SETUP

The system's speed is fixed to 66.6MHz. The user can change the DIP
SWITCH (S1) selection to set up the CPU speed for 233 - 633MHz processor.
The CPU speed must match with the frequency RATIO. It will cause system
hanging up if the frequency RATIO is higher than CPU's.

DIP SWITCH (S1)

1 2 3 4

FREQ.

RATIO

EXT.CLK.

MHz

NT.CLK.

MHz

CPU Type

OFF ON OFF OFF 3 66 200

Pentium



II 200 MHz

ON ON OFF OFF 3.5 66 233

Pentium



II 233 MHz

OFF OFF ON OFF 4 66 266

Pentium



II 266 MHz

ON OFF ON OFF 4.5 66 300

Pentium



II 300 MHz

OFF ON ON OFF 5 66 333

Pentium



II 333 MHz

ON ON ON OFF 5.5 66 366

Pentium



II 366 MHz

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.

3.6. CMOS RTC & ISA CFG CMOS SRAM

There're RTC & CMOS SRAM on board; they have a power supply from
external battery to keep the DATA inviolate & effective. The RTC is a REAL­TIME CLOCK device, which provides the DATE & TIME to system. The
CMOS SRAM is used for keeping the information of system configuration, so

GA-686LX

3-6

the system can automatically boot OS. every time. Due to the life-time of
Battery internal battery is 5 years, the user can change a new Battery to
replace old one after it can not work.

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. 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 J4 on mainboard.

3.9. POWER LED CONNECTOR INSTALLATION

There are system power LED lamps on the panel of case. The power LED
will light on when system is powered-on, which is connected to a 3 PIN
connector.

The connector should be connected to J5 of mainboard in correct direction.

3.10. IDE & ATAPI DEVICE INSTALLATION

There are two Enhance PCI IDE ports (CN6, 7) on board, which following
ATAPI standard SPEC. Any one IDE port can connected to two ATAPI
devices (IDE Hard Disk, CD-ROM & Tape Driver), so total four ATAPI
devices can exist in a system.

The booting Hard Disk should be the Master device of 1st IDE channel. The

J6 is the active LED port for ATAPI device.

3.11. PERIPHERAL DEVICE INSTALLATION

After the I/O device installation and jumpers setup, the mainboard can be
mounted into the case and fixed by screw.