Gigabyte 686LX3 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........................................................................................3-1
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS ................................3-3
3.4. DRAM INSTALLATION........................................................................................3-6
3.5. CPU SPEED SETUP ...........................................................................................3-6
3.6. CMOS RTC & ISA CFG CMOS SRAM................................................................3-7
3.7. SPEAKER CONNECTOR INSTALLATION ........................................................3-7
3.8. HARDWARE RESET SWITCH CONNECTOR INSTALLATION.......................3-7

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3.9. POWER LED CONNECTOR INSTALLATION ...................................................3-8
3.10. IDE & ATAPI DEVICE INSTALLATION.............................................................3-8
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.................................................................................................4-1
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............................................................................4-13
4.8. POWER MANAGEMENT SETUP.......................................................................4-15
4.9. PNP/PCI CONFIGURATION...............................................................................4-19
4.10. LOAD BIOS DEFAULTS....................................................................................4-21
4.11. LOAD SETUP DEFAULTS ................................................................................4-22
4.12. INTEGRATED PERIPHERALS .........................................................................4-23
4.13. SUPERVISOR PASSWORD/USER PASSWORD...........................................4-28
4.14. IDE HDD AUTO DETECTION...........................................................................4-29
4.15. SAVE & EXIT SETUP........................................................................................4-30
4.16. EXIT WITHOUT SAVING............................................................................…..4-31

Introduction
1-1
1. INTRODUCTION
1.1. PREFACE
Welcome to use the 686LX3 motherboard. It is a PentiumII Processor based
PC / ATcompatible systemwith AGP/ PCI/ ISABus, andhas beendesigned 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 Processor based PC / AT compatible mainboard.
qSlot 1 supports PentiumII processor running at 200-633 MHz.
qIntel 440LX chipset, Supports AGP / SDRAM / Ultra DMA/33 IDE/ Keyboard
and PS/2 Mouse Power On / ACPI features.
qSupports 3xDIMMs using 3.3V EDO or SDRAM DIMM module.
qSupports 8 MB - 768 MB EDO / 384MB 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.
qLicensed AWARD BIOS, 1Mbit FLASH RAM.
q30.5 cm x 18 cm ATX SIZE form factor, 4 layers PCB.

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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 GA-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 at 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
66MHz
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
/EF
66MHz
AGP
SLOT
Host Bus
PAC
82443LX
CHIPSET
PLL
52C64-25
PIIX4
82371AB
CHIPSET
PLL
52C64-06

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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

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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 processor 200 –633 MHz.
−242 pins 66MHz slot1 on board.
•SPEED −66 MHz system speed.
−66 MHz AGP bus speed. (133MHz 2X mode)
−33 MHz PCI-Bus speed.
−8 MHz AT bus speed.
•DRAM MEMORY −3 banks 168 pins DIMM module sockets on board.
−Use 8 / 16 / 32 / 64 / 128 / 256 MB DIMM module
DRAM.
−8 ~ 768 MB EDO / 384 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.

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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 RAM.
−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.
−Patch_95.
•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.)

Hardware Installation
3-1
3. HARDWARE INSTALLATION
3.1. UNPACKING
The mainboard package should contain the following:
•The 686LX3 mainboard.
•The Retention Mechanism & Attach Mount
•USER’S MANUAL for mainboard.
•Cable set for IDE, Floppy devices.
•Diskette or CD for Mainboard Utility.
The main board 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.
3.2. MAINBOARD LAYOUT

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PCB Ver : 2.0
686LX3
PIIX4
INTEL
440LX
IDE1
IDE2
FLOPPY
DIMM1
DIMM2
DIMM3
JP2
JP3
JP4
BAT1
BIOS
J13
SW ON
COMA COMB
LPT USB PS/2
KB Power On
Fan Power
Slot 1
ATX Power
JP7
IR
SB-
LINK
×Figure 3.1Ø
PCB Ver : 2.2
686LX3
PIIX4
INTEL
440LX
IDE1
IDE2
FLOPPY
DIMM1
DIMM2
DIMM3
JP2
JP3
JP4
BAT1
BIOS
SW ON
COMA COMB
LPT USB PS/2
KB Power On
Fan Power
Slot 1
ATX Power
JP7
IR
SB-
LINK
JP12
×Figure 3.2Ø

Hardware Installation
3-3
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS
tI/O Ports Connector
USB USB port.
IDE1 For Primary IDE port.
IDE2 For Secondary IDE port.
PS/2 For PS/2 Keyboard port.
PS/2 For PS/2 Mouse port.
Floppy For Floppy port
COMB For Serial port2 (COM B).
COMA For Serial port1 (COM A).
LPT For LPT port.
tSlot 1
For PentiumII processor installed
tFAN PWR : CPU cooling FAN Power Connector
Pin No. Function
1GND.
2+12V
3SENSE
tJ13 : System After Ac Back
Pin No. Function
1Signal
2GND
tJP1 : Keyboard Power On Selection
Pin No. Function
1-2 Enabled Keyboard power on.
2-3 Disabled Keyboard power on.
tJP10 : Wake on LAN Connector
Pin No. Function
1+5VSB
2GND
3CTRL-Signal

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3-4
tJ6 :RING POWER ON
Pin No. Function
1Signal
2GND
tJP12 : CLEAR CMOS Function
Pin No. Function
1-2 CLEAR CMOS Function
2-3 NORMAL
tSB-LINK : For PCI Sound Card Connector
Pin No. Function
1Signal
2GND
3NC
4Signal
5GND
6Signal
tINFRARED Connector (IR) -- Function Optional
Pin No. Function
1IR Data Output
2GND
3IR Data Input
4NC
5POWER (+)
JP7 : 2*11 PIN Jumper
PW: Soft Power Connector
Open: Normal Operation
PW P+P−P−H+
RE SPK
GN
G−
JP7 1
1 1
1H−
G+GN

Hardware Installation
3-5
Short: Power On/Off
RE: Reset Switch
Open: Normal Operation
Short: For Hardware Reset System
P+P − P − : Power LED
PIN 1 : anode (+)
PIN 2 : cathode (−)
PIN 3 : cathode (−)
SPK: Speaker Connector
PIN 1 : VCC
PIN 2 : NC
PIN 3 : NC
PIN 4 : Data
H+H − : IDE Hard Disk Active LED
PIN 1: LED anode (+)
PIN 2: LED cathode (−)
GN: Green Function Switch
Open : Normal operation
Short : Entering Green Mode
G − G + : Green LED
PIN 1 : LED anode (+)
PIN 2 : LED cathode (−)
1
1
1
+−
1

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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 & bank 2.
Since 168 pins DIMM module is 64 bits width, using 1 PCS which can match a
64bits system.The totalmemory sizeis 8MB ~768 MBEDO /384MB 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 66MHz. The user can change the DIP
SWITCH (SW) selection to set up the CPU speed for 200 - 366MHz processor.
The CPU speed must match with the frequency RATIO and external clock
frequency. It will cause system hanging up if the frequencyRATIO andexternal
clock frequency are higher than that of CPU.
DIP SWITCH (SW)
1 2 3 4
FREQ.
RATIO
EXT.CLK.
MHz
INT.CLK.
MHz CPU Type
ON OFF ON ON 366 200 PentiumII 200 MHz
OFF OFF ON ON 3.5 66 233 PentiumII 233 MHz
ON ON OFF ON 466 266 PentiumII 266 MHz
OFF ON OFF ON 4.5 66 300 PentiumII 300 MHz
ON OFF OFF ON 566 333 PentiumII 333 MHz
OFF OFF OFF ON 5.5 66 366 PentiumII 366 MHz

Hardware Installation
3-7
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 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.
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
The main board contains 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
internal battery is 5 years, the user can change a new Battery to replace old
one when it has consumed.
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
SPK is used to connect speaker. Anode connects +, Cathode connects −.
3.8. HARDWARE RESET SWITCH CONNECTOR INSTALLATION
TheRESET switchon panelprovides userswith HARDWARERESET function.
The system will do a cold start after the RESET switch is pushed and released
by user. The RESET switch is a 2 PINS connector and should be installed to

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3-8
RE 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 P+P-P- 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
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.