Gigabyte GA - 686LX3 User manual

R-10-01-080123
GA –686LX3
USER'S MANUAL
1. System power on by PS/2 Mouse: You can power on the
system by double clicking the right or left button of your
PS/2 Mouse.
2. System power on by Keyboard: If your ATX power supply
supports 1 ampere 5V Stand-By function, you can power on
your system by entering password from keyboard.
3. Supports 3 steps ACPI LED
Pentium

II Processor MAINBOARD
REV. 1.0 Second Edition
Release Date 98.1.15

GA-686LX3
1
The author assumes no responsibility for any errors or omissions that 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.
January 14, 1998 Taipei, Taiwan

Quick Installation Guide
2
I. Quick Installation Guide:
CPU SPEED SETUP
The default system bus speed is fixed to 66.6MHz. 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. It will cause
system hanging up if the frequency RATIO is 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
Main Clock JP4 JP3 JP2
66 MHz 1-2 1-2 1-2

GA-686LX3
3
1. PentiumII 200 MHz
GA-686LX3
PIIX4
INTEL
440LX
ON
4321
JP2
JP3
JP4
3 2 1
2. PentiumII 233 MHz
GA-686LX3
PIIX4
INTEL
440LX
ON
4321
JP2
JP3
JP4
3 2 1

Quick Installation Guide
4
3. PentiumII 266 MHz
GA-686LX3
PIIX4
INTEL
440LX
ON
4321
JP2
JP3
JP4
3 2 1
4. PentiumII 300 MHz
GA-686LX3
PIIX4
INTEL
440LX
ON
4321
JP2
JP3
JP4
3 2 1

GA-686LX3
5
5. PentiumII 333 MHz
GA-686LX3
PIIX4
INTEL
440LX
ON
4321
JP2
JP3
JP4
3 2 1
6. PentiumII 366 MHz
GA-686LX3
PIIX4
INTEL
440LX
ON
4321
JP2
JP3
JP4
3 2 1

Quick Installation Guide
6
II. Jumper setting :
PWR : Power LED Connector
GA-686LX3
PIIX4
INTEL
440LX
Power LED
PIN
FUNCTION
1
LED (+)
2
NC
3
LED (-)
1
SPK : Speaker Connector
GA-686LX3
PIIX4
INTEL
440LX
SPK
PIN
FUNCTION
1
VCC
2
NC
3
NC
4
Data
1

GA-686LX3
7
RST : Reset Switch
GA-686LX3
PIIX4
INTEL
440LX
RST
Open: Normal Close: Reset System
GN : Green Function Switch
GA-686LX3
PIIX4
INTEL
440LX
GN
Open: Normal Close: Enter Green Mode

Quick Installation Guide
8
HD : IDE Hard Disk Active LED
GA-686LX3
PIIX4
INTEL
440LX
PIN
FUNCTION
1
LED (+)
2
LED (-)
1
HD LED
Soft PWR : Soft Power Connector
GA-686LX3
PIIX4
INTEL
440LX
1
Soft Power

GA-686LX3
9
POWER : Power Connector
GA-686LX3
PIIX4
INTEL
440LX
1
Power Good
Pin No.
3,5,7,13,
15-17
4,6,19,20
10
12
18
8
9
14
Function
GND
VCC(+5V)
+12V
-12V
-5V
5V SB
PS-ON
PS/2 Mouse / Keyboard Connector
GA-686LX3
PIIX4
INTEL
440LX
Pin Function
1
2
3
4
5Clock.
Data
NC
VCC (+5V)
GND
6NC
PS/2 Keyboard
PS/2 Mouse

Quick Installation Guide
10
J2 : CPU Cooling Fan Power Connector
GA-686LX3
PIIX4
INTEL
440LX
PIN
FUNCTION
1
GND
2
+12V
3
SENSE
FAN Power
1
IDE1: For Primary IDE port
GA-686LX3
PIIX4
INTEL
440LX
1
RED LINE
1 1
1
IDE1
IDE2
FLOPPY

GA-686LX3
11
IDE2: For Secondary IDE port
GA-686LX3
PIIX4
INTEL
440LX
1
RED LINE
1 1
1
IDE1
IDE2
FLOPPY
J7 : FLOPPY PORT
GA-686LX3
PIIX4
INTEL
440LX
1 1
1
IDE1
IDE2
FLOPPY
1
RED LINE

Quick Installation Guide
12
LPT PORT / COM A / COM B
GA-686LX3
PIIX4
INTEL
440LX
1 1
1
IDE1
IDE2
FLOPPY
COM B
LPT PORT
COM A
COMA COMB
LPT PORT
JP1: Keyboard Power On Selection
GA-686LX3
PIIX4
INTEL
440LX
1 1
1
IDE1
IDE2
FLOPPY
Keyboard Power On
Default: Disable
1
2
3
1-2
2-3
Enable
Disable

GA-686LX3
13
CN1: USB Port
GA-686LX3
PIIX4
INTEL
440LX
1 1
1
IDE1
IDE2
FLOPPY
Pin No.
Function
1
2
3
4
5
6
7
8
USB D0-
USB D0+
GND
USB V0
GND
USB V0
USB D1-
USB D1+
J13: ATX Power Control Selection
GA-686LX3
PIIX4
INTEL
440LX
J13
Open: Soft Off Close: Full On

Quick Installation Guide
14
III. Top Performance Test Setting:
Users have to modify the value for each item in chipset features as follow
for top performance setting.
ROM PCI / ISA BIOS
CHIPSET FEATURES SETUP
AWARD SOFTWARE, INC.
: Select Item
ESC
F1
F5
F7
: Load Setup Defaults
: Quit
: Help
: Old Values
PU/PD/+/-
(Shift)F2
: Modify
: Color
DRAM Speed Selection
: Fast
Auto Configuration
DRAM Data Integrity Mode
: Enabled
Memory Hole At 15M-16M
: Disabled
: Non-ECC
Video RAM Cacheable
: Disabled
SDRAM RAS-to-CAS Delay
SDRAM RAS Precharge Time
SDRAM CAS latency Time
: 2
Delayed Transaction
: Disabled
Memory Buffer Strength
: Middle
16 Bit I/O Recovery Time
: 1
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: Fast
: Fast