Gigabyte GA-686LX2 User manual

Table of Table
1
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.......................................................1-4
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.....................................................................................3-2
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS .............................3-2
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
3.9. POWER LED CONNECTOR INSTALLATION ................................................3-7
3.10. IDE & ATAPI DEVICE INSTALLATION..........................................................3-7

686LX2
2
3.12. PERIPHERAL DEVICE INSTALLATION........................................................3-8
3.13. KEYBOARD & PS/2 MOUSE INSTALLATION..............................................3-8
3.14. KEYBOARD SETTING FUNCTION ...............................................................3-8
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............................................................................4-20
4.10. INTEGRATED PERIPHERALS ......................................................................4-22
4.11. LOAD SETUP DEFAULTS .............................................................................4-26
4.12. USER PASSWORD .......................................................................................4-27
4.13. IDE HDD AUTO DETECTION........................................................................4-28
4.14. SAVE & EXIT SETUP.....................................................................................4-29
4.15. EXIT WITHOUT SAVING...............................................................................4-30

Introduction
1-1
1. INTRODUCTION
1.1. PREFACE
Welcome to use the 686LX2 motherboard. The motherboard is a Dual
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
qIntel Dual PentiumII Processor based PC / AT compatible mainboard.
qDual Slot 1 on board supports dual PentiumII processor running at 200-
633MHz.
qIntel 440LX chipset, Support AGP / SDRAM / Ultra DMA/33 IDE / ACPI
features.
qSupport CPU FAN Failure / Overheat Alarm & auto slow down CPU
speed.
qSupport PS/2 mouse & Keyboard Wake Up function.
qSupport Intel LDCMNetwork Manageability.
qSupport PCI Audio & Wake on Lan function.
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, 5xPCI Bus slots, 2xISA Bus slots.
qSupports 2 channels Ultra DMA/33 IDE ports for 4 IDE Device.
qSupports 2xCOM (16550), 1xLPT (EPP / ECP), 1x1.44MB Floppy port.
qSupports 2xUSB ports, 1xPS/2 Mouse & 1xPS/2 Keyboard ports.
qLicensed AWARD BIOS, 2M bit FLASH RAM.

686LX2
1-2
qATX 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 695 781
Business Disk 2230 2234
Hi-End Disk 6110 6260
Business Graphic 129 140
Hi-End Graphic 55.4 61.2
Winstone 97 Business 62.8 65.2
Hi-End 31.1 33.2

Introduction
1-3
66MHz
8MHz
Floppy Port
3.3VEDO/SDRAM
DIMM Sockets
66MHz
1.4. BLOCK DIAGRAM
14.318MHz
IDE Bus
ISA Bus
AGP
SLOT
SLOT2
66MHz
PCI Bus
PCI Bus
66MHz
LPT Port
USB #2
PS/2 Keyboard
COM Ports
USB #1
DRAM Bus
PS/2 Mouse
USB Bus
SLOT 1
AGP Bus
Host Bus
PAC
82443LX
CHIPSET
I/O
83977TF
32.768KHz
24MHz
CLOCK
GEN
52C64-06
33MHz
14.318MHz
33MHz
14.318MHz
CLOCK
GEN
52C64-25
48MHz I/O
APIC
PIIX4
82371AB
CHIPSET
14.318MHz
33MHz
14.318MHz

686LX2
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

686LX2
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 further speed the transaction.
.

Specification
2-1
2. SPECIFICATION
2.1. HARDWARE
•CPU −Dual PentiumII processor 200 –633 MHz.
−Dual 242 pins 66MHz slot1 on board.
•PROTECTION −PC Speaker 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 M ~ 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.
•I/O BUS SLOTS −1 66 / 133MHz AGP BUS.
−5 33MHz Master / Slave PCI-BUS.
−2 8MHz 16 bits ISA BUS.
•IDE PORTS −2 Ultra DMA/33 Bus Master IDE channels on
board.(Using IRQ14,15)
−Backward Support Mode 3,4 IDE & ATAPI CD -
ROM.

686LX2
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 & ACPI LED support..
−IDE & Display power down support.
−Monitor all IRQ / DMA / Display / I/O events.
•BIOS −2M Bit 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.
−Suspend to HD utility.
•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 686LX2 mainboard.
•The Retention Mechanism & Attach Mount
•USER'S MANUAL for mainboard.
•Cable set for IDE¡BFloppy device.
•Diskette or CD for Mainboard Utility Controller.
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

686LX2
3-2
separate.
3.2. MAINBOARD LAYOUT
JP5JP4
GN
REST
SLOT2
PCI1
PCI2
PCI3
COMA
COMB
LPT
USB
KB
Mouse
ATX
POWER
SW
BIOS
CN2
IDE2
FLOPPY
JP3
JP2
J5
CN1
J3
DIMM1
DIMM2
DIMM3
DIMM4
Bank 1
Bank 0
CPU2
AGP
BAT1
GA-686LX2
Bank 3
Bank 2
CN3
IDE1
CPU1
SLOT4
PCI4
PIIX4
371A
PCI5
FAN PWR2
FAN PWR1
1
2
3
4
SPK PWR HD IR SOFT PWR
J11 J10
JP6 J7 J6
JP8
JP9
JP7
J12
JP1
J1
J2
PAC
82443LX
CHIPSET
J4
SLOT2 SLOT1
×Figure 3.1Ø
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS
tI/O Ports Connector
CN1 For USB port.
CN2 For Secondary IDE port.
CN3 For Primary IDE port.
J4 For Floppy port.
J3 For PS/2 Mouse & Keyboard I/O ports.
JP2 For Serial port2 (COM B).
JP3 For Serial port1 (COM A).
J5 For LPT port.
tCPU1: slot1
For PentiumII processor installed.

Hardware Installation
3-3
tCPU2: slot1
For PentiumII processor installed.
tJ1: CPU2 cooling FAN Power Connector
Pin No. Function
1GND.
2+12V
3SENSE
tJ2: CPU1 cooling FAN Power Connector
Pin No. Function
1GND.
2+12V
3SENSE
tJ6: INFRARED Connector (IR) -- Function Option
Pin No. Function
1IR Data Output
2GND
3IR Data Input
4Signal
5POWER (+)
tJ7: Hard Disk active LED (HD-LED)
Pin No. Function
1LED POWER (+)
2LED POWER (-)
3LED POWER (-)
4LED POWER (+)
tJ10: RESET Switch
Pin No. Function
1RESET Input
2GND

686LX2
3-4
tJ11: SPEAKER Connector
Pin No. Function
1VCC
2NC.
3NC.
4Output
tJ12 : By Pass ATX PWR CTRL
Pin No. Function
1Signal
2GND
tJP1 : Keyboard Power On Connector
Pin No. Function
1,2 Close Enabled Keyboard power on.
2,3 Close Disabled Keyboard power on.
tJP4: 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.
tJP5: GN-SW
On –Off for enter suspend Green Mode.
tJP6: POWER ON LED (PW-LED)
Pin No. Function
1LED POWER (+)
2NC
3GND (-)
tJP7 : ACPI LED selection
Pin No. Function
1Signal
2GND

Hardware Installation
3-5
tJP8 : For PCI Audio / Sound Card use only
Pin No. Function
1Signal
2GND
3NC
4Signal
5GND
6Signal
tJP9 : Wake on Lan
Pin No. Function
1+5V SB
2GND
3Signal
tS1: 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
tPOWER1: ATX POWER connector
Pin No. Function
3,5,7,13,15-
17 GND
4,6,19,20 VCC (+5V)
10 +12V
12 -12V
18 -5V
8Power Good
95V SB (Stand by +5V)
14 PS-ON (Soft ON/OFF)

686LX2
3-6
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
EDO & 67~100 MHz for SDRAM. The DRAM memory system on mainboard
consists of bank 0, 1, 2 & bank 3.
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 (SW) selection to set up the CPU speed for 200 - 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

Hardware Installation
3-7
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 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. 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 J11 is used to connect speaker.
The speaker can work well in both direction of connector when it is installed
to the connector J11 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 J10 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 JP6 of mainboard in correct direction.
3.10. IDE & ATAPI DEVICE INSTALLATION
There are two Enhance PCI IDE ports (CN2,3) 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.

686LX2
3-8
The J7 is the active LED port for ATAPI device.
3.12. 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 five PCI -
Bus slots can be used.
3.13. KEYBOARD & PS/2 MOUSE INSTALLATION
The main board supports PS/2 connector type keyboard & Mouse (J3).
The BIOS will auto detect whether the PS/2 Mouse is installed or nor &
assign IRQ12 for Mouse port if which was installed.
After installing the peripheral device, the user should check everything again,
and prepare to power-on the system.
3.14. 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 (Software Reset).