Gigabyte 686LX4 User manual

Table of Contents
1
TABLE OF CONTENTS
1. INTRODUCTION
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 ......................................................... 1-4
1.6. What is AGP?...................................................................................................... 1-6
2. SPECIFICATION
2.1. HARDWARE ....................................................................................................... 2-1
2.2. SOFTWARE........................................................................................................ 2-2
2.3. ENVIRONMENT.................................................................................................. 2-2
3. HARDWARE INSTALLATION
3.1. UNPACKING....................................................................................................... 3-1
3.2. MAINBOARD LAYOUT....................................................................................... 3-2
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS................................ 3-3
3.4. DRAM INSTALLATION....................................................................................... 3-6
3.5. CPU SPEED SETUP........................................................................................... 3-7
3.6. CMOS RTC & ISA CFG CMOS SRAM............................................................... 3-8
3.7. SPEAKER CONNECTOR INSTALLATION........................................................ 3-9
3.8. HARDWARE RESET SWITCH CONNECTOR INSTALLATION...................... 3-9
3.9. POWER LED CONNECTOR INSTALLATION................................................... 3-9

686LX4
2
3.10. IDE & ATAPI DEVICE INSTALLATION............................................................ 3-9
3.11. PERIPHERAL DEVICE INSTALLATION.......................................................... 3-8
3.12. KEYBOARD & PS/2 MOUSE INSTALLATION................................................. 3-8
4. BIOS CONFIGURATION
4.1. ENTERING SETUP............................................................................................. 4-1
4.2. CONTROL KEYS ................................................................................................ 4-2
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........................................................................... 4-13
4.8. POWER MANAGEMENT SETUP...................................................................... 4-18
4.9. PNP/PCI CONFIGURATION .............................................................................. 4-22
4.10. LOAD BIOS DEFAULTS................................................................................... 4-24
4.11. LOAD SETUP DEFAULTS................................................................................ 4-25
4.12. INTEGRATED PERIPHERALS......................................................................... 4-26
4.13. SUPERVISOR/USER PASSWORD................................................................. 4-31
4.14. IDE HDD AUTO DETECTION.......................................................................... 4-32
4.15. SAVE & EXIT SETUP ....................................................................................... 4-33
4.16. EXIT WITHOUT SAVING ................................................................................. 4-34

Introduction
1-1
1. INTRODUCTION
1.1. PREFACE
Welcome to use the 686LX4 motherboard. It is a PentiumII / Celeron
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
qIntel PentiumII / Celeron Processor based PC / AT compatible
mainboard.
qSlot 1 supports PentiumII/ Celeron processor running at 233-633MHz.
qIntel 440LX chipset, Supports AGP / SDRAM / Ultra DMA 33 IDE /
Keyboard and PS/2 Mouse Power On / 3 steps ACPI features.
qSupports 4xDIMMs using 3.3V EDO or SDRAM DIMM module.
qSupports 8 MB - 1 GB EDO / 512MB SDRAM memory on board.
qSupports ECC or Non-ECC type DRAM module.
q1xAGP slot, 4xPCI Bus slots, 3xISA Bus slots.
qSupports 2 channels Ultra DMA 33 IDE ports for 4 IDE Devices.
qSupports 2xCOM (16550), 1xLPT (EPP / ECP), 1x1.44MB Floppy port.
qSupports 2xUSB ports, 1xPS/2 Mouse / Keyboard.
qLicensed AWARD BIOS, 2M bits FLASH ROM.
q30.5 cm x 19 cm ATX SIZE form factor, 4 layers PCB.

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1-2
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 (32 x 2) MB SDRAM (LGS GM72V16821GT10K)
•CACHE SIZE 512 KB included in CPU
•DISPLAY 600 AGP Display Card (4MB SGRAM)
•STORAGE Onboard IDE (IBM DHEA-34330)
•O.S. Windows® 95 OSR2.1
•DRIVER Display Driver at 1024 x 768 x 64k colors x 75Hz.
Triones Bus Master IDE Driver 3.70
Intel PentiumII
Processor 266MHz 300MHz
Winbench97
CPU mark32 692 759
Business Disk 1940 2070
Hi-End Disk 5900 6210
Business Graphics 116 126
Hi-End Graphics 50.8 55.4
Winstone97Business 62.1 64.8
Hi-End 30.7 32.1

Introduction
1-3
3.3V EDO/SDRAM
DIMM Sockets
Floppy Port
1.4. BLOCK DIAGRAM
66MHZ
24MHz
66M
14.318MHz
33MHz
33MHz
33MHz
66MHz
66MHz
Ultra DMA/33
IDE Ports
IDE Bus
PCI Bus
ISA Bus
AGP Bus
LPT Port
Keyboard
COM Ports
DRAM Bus
PS/2 Mouse
USB Bus
USB Ports
14.318MHz
48MHz
14.318MHz
I/O
CHIPSET
83977TF
66M
AGP
SLOT
Host Bus
PAC
82432LX
CHIPSET
PLL
52C64-25
PIIX4
82371AB
CHIPSET
PLL
52C64-06

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1-4
1.5. INTRODUCE THE Pentium

II Processor
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

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1-6
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.

Specification
2-1
2. SPECIFICATION
2.1. HARDWARE
•CPU −PentiumII / Celeron processor 233 –633 MHz.
−242 pins 66MHz slot1 on board.
•SPEED −66 MHz system speed.
−66 MHz AGP bus speed. (2Xmode 133MHz)
−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 DIMM module
DRAM.
−8 ~ 1 GB EDO/512 MB SDRAM.
−Supports 3.3V SDRAM / EDO type DRAM.
−Supports ECC or Non-ECC type DRAM.
•CACHE MEMORY −32 KB 1st cache memory included in CPU.
−256KB / 512 KB 2nd cache in CPU.
−Supports DIB speed mode for L2 Cache.
•I/O BUS SLOTS −4 33MHz Master / Slave PCI-BUS.
−3 8MHz 16 bits ISA BUS.
−1 66MHz / 133MHz AGP bus.
•IDE PORTS −2 Ultra DMA/33 Bus Master IDE channels on
board.(Using IRQ14,15)
−Support Mode 3,4 IDE & ATAPI CD –ROM.
•I/O PORTS −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 / Keyboard.

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2-2
•GREEN FUNCTION −Suspend mode support.
−Green switch & ACPI LED support.
−IDE & Display power down support.
−Monitor all IRQ / DMA / Display / I/O events.
•BIOS −2M bits FLASH ROM.
−Supports Plug & Play, DMI, ACPI Function.
•DIMENSION −ATX Form Factor, 4 layers PCB.
2.2. SOFTWARE
•DRIVER −Bus Master IDE Driver.
−Suspend to HD utility.
•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98, 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.)

BIOS Configuration
4-1
3. HARDWARE INSTALLATION
3.1. UNPACKING
The mainboard package should contain the following:
•The 686LX4 mainboard.
•The Retention Mechanism & Attach Mount
•USER'S MANUAL for mainboard.
•Cable set for IDE, Floppy.
•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.

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4-2
3.2. MAINBOARD LAYOUT
PCB Rev:2.0
PIIX4
INTEL
440LX
IDE1
IDE2
FLOPPY
BANK 1
BANK 2
BANK 3
JP2
JP3
JP4
BAT1
BIOS
J16
SW
COMA COMB
LPT USB PS/2
KB Power On
CPU Fan
CPU 1
ATX Power
BANK 0
IR JP7
×Figure 3.1Ø
PCB Rev: 2.2
PIIX4
INTEL
440LX
IDE1
IDE2
FLOPPY
BANK 1
BANK 2
BANK 3
JP2
JP3
JP4
BAT1
BIOS
SW
COMA COMB
LPT USB PS/2
KB Power On
CPU Fan
CPU 1
ATX Power
BANK 0
IR JP7
POWER
Fan
SYSTEM
Fan
JP8
Ring pwr on
×Figure 3.1Ø

BIOS Configuration
4-3
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS
tI/O Ports Connector
USB USB port.
IDE 1 For Primary IDE port.
IDE 2 For Secondary IDE port.
PS/2 For PS/2 Keyboard/ Mouse port.
Floppy For Floppy port
COM B For Serial port2 (COM B).[Support Modem Ring on]
COM A For Serial port1 (COM A).[Support Modem Ring on]
LPT For LPT port.
ATX Power ATX Power Connector.
tSlot 1
For PentiumII / Celeron processor installed
tCPU FAN : CPU cooling FAN Power Connector
Pin No. Function
1GND.
2+12V
3SENSE
tINFRARED Connector (IR) -- Function (Optional)
Pin No. Function
1IR Data Output
2GND
3IR Data Input
4NC
5POWER (+)
tSB-LINK : For PCI Sound Card Connector
Pin No. Function
1Signal
2GND
3NC
4Signal
5GND

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4-4
6Signal
tWake on LAN Connector
Pin No. Function
1+5VSB
2GND
3CTRL-Signal
tJP1 : Keyboard Power On Selection
Pin No. Function
1-2 Enabled Keyboard power on.
2-3 Disabled Keyboard power on.(Default)
tJ16 : System After Ac Back (Only for PCB 2.0 use)
Pin No. Function
1Signal
2GND
tPower FAN : Power FAN Power Connector (Only for PCB 2.2 use)
Pin No. Function
1GND.
2+12V
3SENSE
tSystem FAN : System FAN Power Connector (Only for PCB 2.2
use)
Pin No. Function
1GND.
2+12V
3SENSE
tJP8 : CLEAR CMOS (Only for PCB 2.2 use)
Pin No. Function
1-2 short Clear CMOS
2-3 short Normal (Default)
tJ19 : Ring PWR ON (Only for PCB 2.2 use)
Pin No. Function

BIOS Configuration
4-5
1+5V SB
2GND

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4-6
JP7: For 2X11 PINs Jumper
Soft PWR: Soft Power Connector
Open: Normal Operation
Short: Power On/Off
RES: Reset Switch
Open: Normal Operation
Short: For Hardware Reset System
P+P − P − : Power LED
PIN 1 : anode (+)
PIN 2 : cathode (−)
PIN 3 : cathode (−)
SPKR: Speaker Connector
PIN 1 : VCC
PIN 2 : NC
PIN 3 : NC
PIN 4 : Data
HD: IDE Hard Disk Active LED
PIN 1: LED anode (+)
PIN 2: LED cathode ( − )
1
1
1
PWR P+P−P−HD
RES S P K R
GN
GD
JP7 1
1 1
1
+
−

BIOS Configuration
4-7
GN: Green Function Switch
Open : Normal operation
Short : Entering Green Mode
GD: Green LED
PIN 1 : LED anode (+)
PIN 2 : LED cathode ( − )
3.4. DRAM INSTALLATION
The mainboard can be installed with 8 / 16 / 32 / 64 / 128 / 256 MB 168
pins DIMM module DRAM, and the DRAM speed must be 50 or 60 ns for
EDO & 67~100 MHz for SDRAM. The DRAM memory system on mainboard
consists of bank 0, 1 ,2 & bank 3.
Since 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 default system bus speed is 66.6MHz. The user can change the DIP
SWITCH (SW) selection to set up the CPU speed for 233 - 366MHz
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.
1

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4-8
DIP SWITCH (SW)
1 2 3 4
REQ.
RATIO
EXT.CLK
. MHz
INT.CLK
. MHz CPU Type
OFF OFF ON ON 3.5 66 233 PentiumII 233 MHz
(Celeron 233MHz)
ON ON OFF ON 4 66 266 PentiumII 266 MHz
(Celeron 266MHz)
OFF ON OFF ON 4.5 66 300 PentiumII 300 MHz
(Celeron 300MHz)
ON OFF OFF ON 5 66 333 PentiumII 333 MHz
(Celeron 333MHz)
OFF OFF OFF ON 5.5 66 366 PentiumII 366 MHz
(Celeron 366MHz)
MJP2, JP3, JP4 (Select the system speed¡Ð66 / 75 / 83 / 100MHz )
Main Clock JP4 JP3 JP2
66 MHz 1-2 1-2 1-2
75 MHz 1-2 2-3 1-2
83 MHz 2-3 1-2 2-3
100 MHz 1-2 2-3 2-3
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 We don’t recommend you to setup your system speed to 75,
83 or 100MHz because these frequencies are not the standard
specifications for CPU, Chipset and most of the peripherals.
Whether your system can run under 75, 83 or 100MHz properly will
depend on your hardware configurations: CPU, SDRAM, Cards, etc.
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 REAL-
TIME 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

BIOS Configuration
4-9
internal battery is 5 years, the user can change a new Battery to replace old
one after it cannot work.
MDanger of explosion if battery is incorrectly replaced.
MReplace only with the same or equivalent type recommended by the
manufacturer.
MDispose of used batteries according to the manufacturer’s instructions.
3.7. SPEAKER CONNECTOR INSTALLATION
There is a speaker in AT system for sound purpose. The 4 - Pins connector
SPKR is used to connect speaker, Anode connects +, Cathode connects −.
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 mainboard.
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 mainboard 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 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. 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