Gigabyte GA-686BX User Manual

Table of Contents

TABLE OF CONTENTS

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

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

1.2. KEY FEATHERS............................................................................................1-1

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

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

1.5. INTRODUCE THE PENTIUM II PROCESSOR & AGP.............................1-4

1.6. WHAT IS AGP? .................................................1-6

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

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

3.4. DRAM INSTALLATION..................................................................................3-5

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

3.6. CMOS RTC & ISA CFG CMOS SRAM..........................................................3-6

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

3.8. HARDWARE RESET SWITCH CONNECTOR INSTALLATION................. 3-7

3.9. POWER LED CONNECTOR INSTALLATION .............................................3-7

3.10. IDE & ATAPI DEVICE INSTALLATION....................................................... 3-7

3.11. PERIPHERAL DEVICE INSTALLATION.....................................................3-7

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

17

686BX

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

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

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

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

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

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

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

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

4.6. BIOS FEATURES SETUP.............................................................................4-8

4.7. CHIPSET FEATURES SETUP......................................................................4-12

4.8. POWER MANAGEMENT SETUP.................................................................4-17

4.9. PNP/PCI CONFIGURATION........................................................................4-21

4.10. LOAD BIOS DEFAULTS..............................................................................4-23

4.11. LOAD PERFORMANCE DEFAULTS..........................................................4-24

4.12. INTEGRATED PERIPHERALS ................................................................... 4-25

4.13. USER PASSWORD.....................................................................................4-29

4.14. IDE HDD AUTO DETECTION.....................................................................4-30

4.15. SAVE & EXIT SETUP..................................................................................4-32

4.16. EXIT WITHOUT SAVING............................................................................4-33

18

Introduction

1. INTRODUCTION

1.1. PREFACE

Welcome to use the 686BX motherboard. It 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 main board.

q Slot 1 supports Pentium
q Intel 440BX chipset, Supports AGP / SDRAM / Ultra DMA33 IDE / Keyboard



II processor running at 200-633 MHz.

and PS/2 Mouse Power On / ACPI features.

q Supports 4xDIMMs using 3.3V SDRAM DIMM module.
q Supports 8 MB - 1 GB 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 Devices.
q Supports 2xCOM (16550), 1xLPT (EPP / ECP), 1x1.44MB Floppy port.
q Supports 2xUSB ports, 1xPS/2 Mouse & 1xPS/2 Keyboard.
q Licensed AWARD BIOS, 2Mbit FLASH RAM.
q 30.5 cm x 19 cm ATX SIZE form factor, 4 layers PCB.

1-1

686BX

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

• CPU

• DRAM (32 x 2) MB SDRAM (MICRON MT 48LC2M8A1 -8)

• CACHE SIZE 512 KB included in CPU

• DISPLAY GA-600 AGP Display Card (4MB SGRAM)

• STORAGE Onboard IDE (IBM DHEA-36480)

• O.S. Windows NT™ 4.0

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

Processor

Pentium II processor

TRIONES Bus Master IDE Driver 3.70

Intel Pentium II

300MHz(100x3) 350MHz(100x3.5)

Winbench98

CPU mark32
FPU Winmark
Business Disk 1670 1780

Hi-End Disk 3300 3620

Business Graphics 165 188

Hi-End Graphics 183 214

795
1560

952
1850

Winstone98

Business 29.8 33.8

Hi-End 31.2 35.3

1-2

Introduction

CHIPSET

CHIPSET

1.4. BLOCK DIAGRAM

AGP

SLOT

AGP Bus

66/100MHz

66MHz

CY2318N2PVC

-1

Ultra DMA/33

IDE Ports

66 / 100MHz

IDE Bus

INTEL

82443BX

PCI Bus

82371EB

Host Bus

PIIX4

66MHz

DRAM Bus

33MHz

48MHz

14.318MHz

33MHz

9148BF-10

14.318MHz

3.3V EDO/SDRAM
DIMM Sockets

33MHz

ICS

24MHz

USB Ports

ISA Bus

USB Bus

14.318MHz

83977TF

1-3

I/O

CHIPSET

COM Ports

LPT Port

Floppy Port

Keyboard

PS/2 Mouse

686BX

1.5. INTRODUCE THE Pentium II Processor & AGP

Figure 1:Retention Mechanism & attach Mount

Figure 2:OEM Pentium II Processor

1-4

Introduction

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

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

1-5

686BX

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-bits 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 speed up the
transaction.

1-6

2. SPECIFICATION

2.1. HARDWARE

Specification

• CPU

• SPEED

• DRAM MEMORY

• CACHE MEMORY

• I/O BUS SLOTS

• IDE PORTS

• I/O PORTS

− Pentium

− 242 pins 66 / 100MHz slot1 on board.

− 66 /100MHz system speed.

− 66 MHz AGP bus speed. (133MHz 2xmode)

− 33 MHz PCI-Bus speed.

− 8 MHz AT bus speed.

− 4 banks 168 pins DIMM module sockets on board.

− Use 8 / 16 / 32 / 64 / 128 / 256 MB DIMM module



II processor 200 – 633 MHz.

DRAM.

− 8 ~ 1 GB SDRAM.

− Supports 3.3V SDRAM.

− Supports ECC or Non-ECC type DRAM.

− 32 KB L1 cache memory included in CPU.

− 256KB / 512 KB L2 cache memory included in CPU.

− Supports DIB speed mode for L2 Cache.

− 4 33MHz Master / Slave PCI-BUS.

− 3 8MHz 16 bits ISA BUS.

− 1 66MHz / 133MHz AGP bus.

− 2 Ultra DMA/33 Bus Master IDE channels onboard.

(Using IRQ14,15)

− Support Mode 3,4 IDE & ATAPI CD – ROM.

− Supports 2 16550 COM ports.

− Supports 1 EPP/ECP LPT port.

− Supports 1 1.44 / 2.88 MB Floppy port.

− Supports 2 USB ports.

− Supports PS/2 Mouse & PS/2 Keyboard.

2-1

686BX

• GREEN FUNCTION

• BIOS

• DIMENSION

− Suspend mode support.

− Green switch & ACPI LED support.

− IDE & Display power down support.

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

− 2M bits FLASH RAM.

− Supports Plug & Play, DMI, ACPI Function.

− ATX Form Factor, 4 layers PCB.

2.2. SOFTWARE

• DRIVER − Bus Master IDE Driver.

− Suspend to HD utility.

− INTEL LDCM®.

• BIOS − Licensed AWARD BIOS.

− AT CMOS Setup, BIOS / Chipset Setup, Green

Setup, Hard Disk Utility included.

• 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.)

2-2

Hardware Installation

3. HARDWARE INSTALLATION

3.1. UNPACKING

The main board package should contain the following:

• The 686BX main board.

• The Retention Mechanism & Attach Mount

• USER’ S MANUAL for main board.

• Cable set for IDE, Floppy devices.

• Diskette or CD for main board Utility.

The main board contains sensitive electric components, which can be easily
damaged by static electricity, so the main board 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 main board 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 main board 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.

3.2. MAINBOARD LAYOUT

3-1

686BX

COMA COMB

RST

IDE2

IDE1

PW Led

Slot 1

HD IR

INTEL
440BX

LPT

1

1

GN

BIOS

PIIX4

686BX

J15

JP6

4 3 2 1

SW

ON

BATT1

1
1
1

1

SPK

ATX Power

FLOPPY

Soft Power

USB

KB Power On

×Figure 3.1Ø

3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS

t I/O Ports Connector

CN1 USB port.
CN3 For Primary IDE port.
CN2 For Secondary IDE port.

J2 For PS/2 Keyboard port.
J2 For PS/2 Mouse port.
J3 For Floppy port
J4 For Serial port2 (COM B).
J5 For Serial port1 (COM A).
J6 For LPT port.

Fan Power

DIMM1
DIMM2
DIMM3
DIMM4

1

MOUSE

KB

t GN : GN-SW

Pin No. Function

1 CTRL-Signal
2 GND

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

Pin No. Function

3-2

1 LED POWER (+)
2 LED POWER (-)

t J1 : CPU cooling FAN Power Connector

Pin No. Function

1 GND.
2 +12V
3 SENSE

t J15 : System After Ac Back

Pin No. Function

1 Signal
2 GND

t JP1 : Keyboard Power On Selection

Pin No. Function

1-2 Enabled Keyboard power on.
2-3 Disabled Keyboard power on.

t RST : RESET Switch

Pin No. Function

1 RESET Input
2 GND

Hardware Installation

t PW LED : POWER ON LED ( PW-LED)

Pin No. Function

1 LED POWER (+)
2 NC
3 GND

t Slot 1

For Pentium II processor installed

t SPK : SPEAKER Connector

Pin No. Function

1 VCC

3-3

686BX

2 NC.
3 NC.
4 Output

t Soft PWR : Soft Power Switch

Pin No. Function

1 CTRL-Signal
2 GND

t J13 : Wake on LAN Connector

Pin No. Function

1 +5VSB
2 GND
3 CTRL-Signal

t J14 : For PCI Sound Card Connector

Pin No. Function

1 Signal
2 GND
3 NC
4 Signal
5 GND
6 Signal

t IR: INFRARED Connector

Pin No. Function

1 IR DATA OUTPUT
2 GND
3 IR DATA INPUT
4 Signal
5 POWER¡]¡Ï¡^

3-4

Hardware Installation

3 2 1

3 2 1

3 2 1

3.4. DRAM INSTALLATION

The main board can be installed with 8 / 16 / 32 / 64 / 128 / 256 MB 168 pins
DIMM module DRAM, and the DRAM speed must be 67~100 MHz for SDRAM
when system bus speed is set to 66MHz. When system bus speed is set to
100MHz, 100MHz SDRAM is required. The DRAM memory system on main
board consists of bank 0, 1, 2 & bank 3.

Since 168 pins DIMM module is 64 bits width, therefore 1 piece of DIMM
module may match a 64 bits system. The total memory size is 8 MB ~ 1 GB
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 could not be inserted into socket
completely.

3.5. CPU SPEED SETUP

The system bus speed can be set to 66.6MHz or 100MHz form the jumper
(JP6). The user can change the DIP SWITCH (SW) selection to set up the
CPU speed for different processors. The CPU speed must match with the
frequency RATIO and Front Side Bus (FSB) speed. It will cause system
hanging up if the frequency RATIO and FSB Speed do not match with the CPU.

Set system speed to 66MHz: JP6 pin 1-2 short will cause system
always run at 66 MHz FSB (Front Side Bus).

JP6

Set system speed to 100MHz: JP6 all pins open will cause system
always run at 100MHz FSB.

JP6

Reserved: This function is reserved for future use. (Please don’ t set
JP6 pin 2-3 short at this time!)

JP6

DIP SWITCH (SW)

FREQ.
RATIO

EXT.CLK.

MHz

3-5

INT.CLK.

MHz

CPU Type

686BX

1 2 3 4

OFF OFF ON ON 3.5 66 233 Pentium

ON ON OFF ON 4 66 266 Pentium

OFF ON OFF ON 4.5 66 300 Pentium

ON OFF OFF ON 5 66 333 Pentium

OFF OFF OFF ON 5.5 66 366 Pentium

ON OFF ON ON 3 100 300 Pentium

OFF OFF ON ON 3.5 100 350 Pentium

ON ON OFF ON 4 100 400 Pentium

OFF ON OFF ON 4.5 100 450 Pentium

M

The CPU is a sensitive electric component and it can be easily



II 233 MHz



II 266 MHz



II 300 MHz



II 333 MHz



II 366 MHz



II 300 MHz



II 350 MHz



II 400 MHz



II 450 MHz

damaged by static electricity, so users must keep it away from metal
surface when the CPU is installed onto main board.

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

M Danger of explosion if battery is incorrectly replaced.
M Replace only with the same or equivalent type recommended by the

manufacturer.

M Dispose of used batteries according to the manufacturer’ s instructions.

3.7. SPEAKER CONNECTOR INSTALLATION

3-6

Hardware Installation

There is a speaker in AT system for sound purpose. The 4 - Pins connector
SPK is used to connect speaker.

3.8. HARDWARE RESET SWITCH CONNECTOR INSTALLATION

The RESET switch on panel provides users with HARDWARE RESET function.
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

RST on main board.

3.9. POWER LED CONNECTOR INSTALLATION

System has power LED lamp on the panel of case. The power LED will light on
off or flash to indicate which step on the system. The connector should be
connected to PWR of main board in correct direction.

3.10. IDE & ATAPI DEVICE INSTALLATION

There are two-Enhanced PCI IDE ports (IDE1, IDE2) 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 HD is the active LED port for ATAPI devices.

3.11. PERIPHERAL DEVICE INSTALLATION

After the I/O device installation and jumpers setup, the main board can be
mounted into the case and fixed by screw. To complete the main board
installation, the peripheral device could be installed now. The basic system
needs a display interface card. If the PCI - Bus device is to be installed in the
system, any one of four PCI - Bus slots can be used.

3.12. KEYBOARD & PS/2 MOUSE INSTALLATION

The main board supports PS/2 Mouse (J2). The BIOS will auto detect whether
the PS/2 Mouse is installed or not & assign IRQ12 for PS/2 Mouse port if it is
installed. After installing the peripheral device, the user should check
everything again, and prepare to power-on the system.

3-7