Gigabyte GA-686BX User manual

Table of Contents
17
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

686BX
18
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

Introduction
1-1
1. INTRODUCTION
1.1. PREFACE
Welcome to use the 686BX 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 main board.
qSlot 1 supports PentiumII processor running at 200-633 MHz.
qIntel 440BX chipset, Supports AGP / SDRAM / Ultra DMA33 IDE / Keyboard
and PS/2 Mouse Power On / ACPI features.
qSupports 4xDIMMs using 3.3V SDRAM DIMM module.
qSupports 8 MB - 1 GB 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 & 1xPS/2 Keyboard.
qLicensed AWARD BIOS, 2Mbit FLASH RAM.
q30.5 cm x 19 cm ATX SIZE form factor, 4 layers PCB.

686BX
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. (Different Hardware & Software
configuration will result in different benchmark testing results.)
•CPU PentiumII processor
•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.
TRIONES Bus Master IDE Driver 3.70
Intel PentiumII
Processor 300MHz(100x3) 350MHz(100x3.5)
Winbench98
CPU mark32 795 952
FPU Winmark 1560 1850
Business Disk 1670 1780
Hi-End Disk 3300 3620
Business Graphics 165 188
Hi-End Graphics 183 214
Winstone98Business 29.8 33.8
Hi-End 31.2 35.3

Introduction
1-3
3.3V EDO/SDRAM
DIMM Sockets
Floppy Port
1.4. BLOCK DIAGRAM
24MHz
66/100MHz
14.318MHz
33MHz
33MHz 33MHz
66 / 100MHz
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
66MHz
AGP
SLOT
Host Bus
INTEL
82443BX
CHIPSET
CY2318N2PVC
-1
PIIX4
82371EB
CHIPSET
ICS
9148BF-10

686BX
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

686BX
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 66 / 100MHz slot1 on board.
•SPEED −66 /100MHz system speed.
−66 MHz AGP bus speed. (133MHz 2xmode)
−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 SDRAM.
−Supports 3.3V SDRAM.
−Supports ECC or Non-ECC type DRAM.
•CACHE MEMORY −32 KB L1 cache memory included in CPU.
−256KB / 512 KB L2 cache memory included 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 onboard.
(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 & PS/2 Keyboard.

686BX
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.
−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.)

Hardware Installation
3-1
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

686BX
3-2
686BX
PIIX4
INTEL
440BX
11
1
IDE1
IDE2
FLOPPY
DIMM2
DIMM3
DIMM4
BATT1
BIOS
SW
4 3 2 1
ON
COMA COMB
LPT USB MOUSE
KB
KB Power On
Fan Power
Slot 1
SPK
RST
PW Led
HD IR GN
Soft Power
ATX Power
1
1
1
DIMM1
1
JP6
J15
×Figure 3.1Ø
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS
tI/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.
tGN : GN-SW
Pin No. Function
1CTRL-Signal
2GND
tHD : Hard Disk active LED (HD-LED)
Pin No. Function

Hardware Installation
3-3
1LED POWER (+)
2LED POWER (-)
tJ1 : CPU cooling FAN Power Connector
Pin No. Function
1GND.
2+12V
3SENSE
tJ15 : 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.
tRST : RESET Switch
Pin No. Function
1RESET Input
2GND
tPW LED : POWER ON LED ( PW-LED)
Pin No. Function
1LED POWER (+)
2NC
3GND
tSlot 1
For PentiumII processor installed
tSPK : SPEAKER Connector
Pin No. Function
1VCC

686BX
3-4
2NC.
3NC.
4Output
tSoft PWR : Soft Power Switch
Pin No. Function
1CTRL-Signal
2GND
tJ13 : Wake on LAN Connector
Pin No. Function
1+5VSB
2GND
3CTRL-Signal
tJ14 : For PCI Sound Card Connector
Pin No. Function
1Signal
2GND
3NC
4Signal
5GND
6Signal
tIR: INFRARED Connector
Pin No. Function
1IR DATA OUTPUT
2GND
3IR DATA INPUT
4Signal
5POWER¡]¡Ï¡^

Hardware Installation
3-5
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).
Set system speed to 100MHz: JP6 all pins open will cause system
always run at 100MHz FSB.
Reserved: This function is reserved for future use. (Please don’t set
JP6 pin 2-3 short at this time!)
DIP SWITCH (SW) FREQ.
RATIO
EXT.CLK.
MHz
INT.CLK.
MHz CPU Type
JP6
3 2 1
JP6
3 2 1
JP6
3 2 1

686BX
3-6
1 2 3 4
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
ON OFF ON ON 3100 300 PentiumII 300 MHz
OFF OFF ON ON 3.5 100 350 PentiumII 350 MHz
ON ON OFF ON 4100 400 PentiumII 400 MHz
OFF ON OFF ON 4.5 100 450 PentiumII 450 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 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 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 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

Hardware Installation
3-7
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
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 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.