Gigabyte GA-686DX User manual

GA - 686DX
USER'S MANUAL
Dual PENTIUMâ PCI - ISA BUS MAINBOARD
REV. 1 Fir t Edition

GA-686DX
The author assumes no responsibility for any errors or omissions which may
appear in this document nor does it make a commitment to update the
information contained herein.
I M PC/AT, PC/XT are trademarks of International usiness Machine
Corporation.
PENTIUM is a trademark of Intel Corporation.
AWARD is a trademark of Award Software, Inc.
MS-DOS WINDOWS NT are registered trademarks of Microsoft Corporation.
UNIX is a trademark of ell Laboratories.
DECEM ER 16, 1996 Taipei, Taiwan
TABLE OF CONTENTS

Table of Contents
1. INTRODUCTION.......................................................................................1
1.1. PREFACE...............................................................................................1
1.2. KEY FEATURES....................................................................................1
1.3. PERFORMANCE LIST...........................................................................2
1.4. BLOCK DIAGRAM..................................................................................3
1.5. INTRODUCE THE PCI - BUS................................................................4
1.6. FEATURES............................................................................................4
2. SPECIFICATION.......................................................................................1
2.1. HARDWARE...........................................................................................1
2.2. SOFTWARE...........................................................................................2
2.3. ENVIRONMENT.....................................................................................2
3. HARDWARE INSTALLATION...................................................................1
3.1. UNPACKING..........................................................................................1
3.2. MAINBOARD LAYOUT..........................................................................2
3.3. UICK REFERENCE FOR JUMPERS & CONNECTORS....................2
3.4. DRAM INSTALLATION..........................................................................5
3.5. CPU INSTALLATION AND JUMPERS SETUP......................................5
3.6. CMOS RTC & ISA CFG CMOS SRAM..................................................6
3.7. SPEAKER CONNECTOR INSTALLATION............................................6
3.8. HARDWARE RESET SWITCH CONNECTOR INSTALLATION............6
3.9. POWER LED & KEY LOCK CONNECTOR INSTALLATION.................6
3.10. GREEN FUNCTION INSTALLATION...................................................6
3.11. ATAPI DEVICE INSTALLATION..........................................................7
3.12. PERIPHERAL DEVICE INSTALLATION..............................................7
3.13. KEYBOARD & PS/2 MOUSE INSTALLATION.....................................7
3.14. KEYBOARD SETTING FUNCTION.....................................................7
4. BIOS CONFIGURATION..........................................................................1
4.1. ENTERING SETUP................................................................................1
4.2. CONTROL KEYS...................................................................................2
4.3. GETTING HELP.....................................................................................3
4.3.1. Main Menu....................................................................................3

GA-686DX
4.3.2. Status Page Setup Menu / Option Page Setup Menu..................3
4.4. THE MAIN MENU...................................................................................3
4.5. STANDARD CMOS SETUP MENU.......................................................5
4.6. BIOS FEATURES SETUP......................................................................9
4.7. CHIPSET FEATURES SETUP...............................................................13
4.8. POWER MANAGEMENT SETUP..........................................................15
4.9. PNP/PCI CONFIGURATION..................................................................17
4.10. INTEGRATED PERIPHERALS............................................................18
4.11. LOAD SETUP DEFAULTS...................................................................21
4.12. USER PASSWORD..............................................................................22
4.13. IDE HDD AUTO DETECTION..............................................................23
4.14. SAVE & EXIT SETUP...........................................................................24
4.15. EXIT WITHOUT SAVING.....................................................................25
5. AT TECHNICAL INFORMATION..............................................................1
5.1. I/O BUS CONNECTOR PIN OUT...........................................................1
5.1.1. ISA SLOT PIN OUT......................................................................1
5.1.2. PCI - BUS SLOT PIN OUT...........................................................2
5.2. I/O & MEMORY MAP.............................................................................3
5.3. TIMER & DMA CHANNELS MAP...........................................................3
5.4. INTERRUPT MAP..................................................................................4
5.5. RTC & CMOS RAM MAP.......................................................................5
APPENDIX A: POST MESSAGE.....................................................................1
APPENDIX B: POST CODES..........................................................................1
APPENDIX C: BIOS DEFAULT DRIVE TABLE...............................................1
APPENDIX D: PROBLEM SHEET...................................................................1

Introduction
1. INTRODUCTION
1.1. PREFACE
Welcome to use the GA - 686DX motherboard. The motherboard is a Dual
PENTIUMâ Pro Processor based PC / AT compatible system with ISA bus
and PCI Local us, 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 IOS SETUP program.
1.2. KEY FEATURES
qDual Intel Pentiumâ Pro Processor based PC / AT compatible mainboard.
qTwo Socket 8 on board supports Pentiumâ Pro processor & P6T running
at 150-200 MHz.
qCPU L1 / L2 Write- ack cache operation.
qSupports 8 - 512 M DRAM memory on board.
q5 Master / Slave PCI us slots, 3 ISA us slots.
qSupports 2 channels Enhance PCI IDE ports for 4 IDE Device.
qSupports 2xCOM (16550), 1xLPT (EPP / ECP), 1x1.44M Floppy port.
qSupports Green function, Plug & Play function.
qLicensed AWARD IOS, FLASH EEPROM for IOS update.
qDALLAS 12887 like RTC on board.
1-1

GA-686DX
qATX form factor, 6 layers PC .
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 Pentiumâ Pro processor 200 MHz
·DRAM 32 M EDO
·CACHE SIZE 256K /512 K includeed in CPU
·DISPLAY Matrox Millennium 2M
·STORAGE Onboard IDE port + Quantum F 1280AT IDE Dirve
·O.S. Windows95 with Display Driver at 1024 x 768 x 256
colors x 70Hz & usMaster IDE Driver.
Program 512KB 256KB
Winstone32 index 143.3 140.5
Winstone96 index 88.6 87.7
WinBench96
CPUmark32 612.0 588.0
Disk WinMark96 1280.0 1280.0
Graphics WinMark96 36.5 36.5
1-2

Introduction
1.4. BLOCK DIAGRAM
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GA-686DX
1.5. INTRODUCE THE PCI - BUS
Connecting devices to a CPU local bus can dramatically increase the speed of
I/O-bound peripherals with only a slight increase in cost over traditional
systems.
This price / performance point has created a vast market potential for local bus
products.
The main barrier to this market has been the lack of an accepted standard for
local bus peripherals.
Many mainboard and chipset manufactures developed their own local bus
implementations, but they are incompatible with each other.
The VL (Video Electronics Standards Association) local bus and PCI
(Peripheral Component Interconnect) bus specification was created to end this
confusion.
The PCI - bus standard, under development since Jun. 1992, which is
designed to bring workstation-level performance to standard PC platform. The
PCI - bus removes many of the bottlenecks that have hampered PC for
several years.
On the PCI - bus, peripherals operate at the native speed of the computer
system, thus enabling data transfer between peripherals and the system at
maximum speed.
This performance is critical for bandwidth-constrained devices such as video,
multimedia, mass storage, and networking adapters.
PCI - bus standard provides end-users with a low-cost, extendible and
portable local bus design, which will allow system and peripherals from
different manufactures to work together.
1.6. FEATURES
q32 bits bus transfer mode.
qus Master or Slave access.
qMemory burst transfer to 132 M /sec.
q33 MHz operation speed.
q10 device loading ability.
1-4

Introduction
qCPU independent.
1-5

Specification
2. SPECIFICATION
2.1. HARDWARE
· CPU - Dual Pentiumâ Pro processor 150 - 200 MHz.
- Pentiumâ Pro OverDriveâ processor (P6T).
- Two 387 pins (socket 8) ZIF socket on board.
· COPROCESSOR - Included in Pentium.
· SPEED - 60 / 66 MHz system speed.
- 30 / 33 PCI- us speed.
- 7.5 / 8 MHz AT bus speed.
· DRAM MEMORY - 3 banks 72 pins SIMM module socket on board.
- Use 4 / 8 / 16 / 32 / 64 /128 M 60~70 ns SIMM
module DRAM.
- 8 ~ 512 M DRAM size.
- Support Fast Page / EDO DRAM access mode.
· CACHE MEMORY - 16 K cache memory included in CPU.
- 256K /512 K 2nd cache in CPU.
- Support Write ack cache mode for L1/L2 Cache.
· I/O BUS SLOTS - 5 Master / Slave PCI- US.
- 3 16 bits ISA US.
· IDE PORTS - 2 Enhanced IDE channels on board.(Using
IRQ14,15)
- Support Mode 3,4 IDE & ATAPI CD - ROM.
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GA-686DX
· 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 M Floppy port. (Using DMA2
& IRQ6)
- Supports PS/2 Mouse. (Using IRQ12 )
- Supports PS/2 Keyboard.
· GREEN
FUNCTION
- Standby & Suspend mode support.
- Green switch & LED support.
- IDE & Display power down support.
- Monitor all IRQ / DMA / Display / I/O events.
· BIOS - 128K FLASH EEPROM.
- Supports Plug & Play Function.
· DIMENSION - ATX Form Factor, 6 layers PC .
2.2. SOFTWARE
· IOS - Licensed AWARD IOS.
- AT CMOS Setup, IOS / Chipset Setup, Green
Setup, Hard Disk Utility included.
· O.S. - Operation with MS-DOSâ, Windowsâ95,
WINDOWSä 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).
2-2

Specification
· Vibration - 0 to 1,000 Hz.
· Electricity - 4.9 V to 5.2 V.
- Max. 20A current at 5V.
2-3

Hardware Installation
3. HARDWARE INSTALLATION
3.1. UNPACKING
The mainboard package should contain the following:
·The GA - 686DX mainboard.
·USER'S MANUAL for mainboard Installation.
·Cable set for IDE & Floppy device.
·Diskette for US MASTE ATAPI device.
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. e 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.
MDO 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 I M-AT system board.
3-1

GA-686DX
It is assumed that the chassis is designed for a standard I M XT/AT
mainboard mounting. Place the chassis on the anti-static mat and remove the
cover.
Take the plastic clips, Nylon stand-off and screws for mounting the system
board, and keep them separate.
3.2. MAINBOARD LAYOUT
×Figure 3.1Ø
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS
tCN1-8 I/O Ports Connector
CN1 For Serial port1(COM A).
CN2 For LPT port.
CN3 For Serial port2 (COM B).
3-2

Hardware Installation
CN4 For Keyboard I/O port.
CN4 For PS/2 Mouse port.
CN5 USB port (option).
CN6 For Primary IDE port.
CN7 For Secondary IDE port.
CN8 For Floppy port
tJ1: SPEKER Connector
Pin No. Function
1 VCC
2 NC.
3 NC.
4 Output
tJ2: RESET Switch (RST)
Pin No. Function
1 RESET Input
2 GND
tJ3: POWER ON LED (PW-LED)
Pin No. Function
1 LED POWER (+)
2 NC
3 GND (-)
tJ4: Hard Disk active LED
Pin No. Function
1 LED POWER (+)
2 LED POWER (-)
3 LED POWER (-)
4 LED POWER (+)
tJ5: INFARED Connector (IR) -- Function Option
Pin No. Function
1 IR Data Output
2 GND
3 IR Data Input
4 NC
3-3

GA-686DX
5 POWER (+)
tJ6: GN-SW
Pin No. Function
Close Force system to enter Green Mode (Suspend mode).
Open Normal Operation.
tJ7: ATX Power On/Off
Pin No. Function
Close &
Open
This is the soft switch (Power On/Off) of ATX Power Supply,
Close & Open one time to Power On & again to Power Off.
tJ8: GN-LED
Pin No. Function
1 LED anode (+).
2 LED cathode (-).
tJP3,4: CPU cooling FAN Power Connector
Pin No. Function
1 +12V
2 GND
tS1-1: System Speed Selection
1 Function
ON For 60 MHz system speed ( CPU 150, 180 MHz ).
OFF For 66 MHz system speed ( CPU 166, 200 MHz ).
tS1-2,3,4: CPU INT. / EXT. FRE . RATIO
2 3 4 Function
ON OFF OFF x 2.5
OFF ON OFF x 3
ON ON OFF x 3.5
OFF OFF ON x 4
tPower: ATX POWER connector
Pin No. Function
3,5,7,13,15-17 GND
3-4

Hardware Installation
4,6,19,20 VCC (+5V)
10 +12V
12 -12V
18 -5V
8 Power Good
9 5V SB (Stand by +5V)
14 PS-ON (Soft ON/OFF)
3.4. DRAM INSTALLATION
The mainboard can be installed with 4 / 8 / 16 / 32 / 64 / 128 M 72 pins
SIMM module DRAM, and the DRAM speed must be 60 or 70 ns. The DRAM
memory system on mainboard consists of bank 0, 1 & bank 2. Each bank
consist of 2 PCs 72 pins SIMM module DRAM.
ecause the 72 pins SIMM module is 32 bits width, using 2 PCs which can
match a 64 bits system. The total memory size is 8 - 512 M .
The DRAM installation position refer to Figure 3.1, and notice the Pin 1 of
SIMM module must match with the Pin 1 of SIMM socket when the DRAM
SIMM module is installed.
Insert the DRAM SIMM module into the SIMM socket at 45 degree angle. If
there is a wrong direction of Pin 1, the DRAM SIMM module couldn't be
inserted into socket completely.
After completely insert SIMM module into socket, then press the SIMM
module in vertical direction until the left and right metal holders can keep the
SIMM module standing up con-firmly.
3.5. CPU INSTALLATION AND JUMPERS SETUP
The system's speed depends on the frequency of CLOCK GENERATOR. The
user can change the DIP SWITCH (S1) selection to set up the system speed
to 60 MHz or 66 MHz for 150 - 200 MHz processor.
The mainboard can use Intel Pentiumâ Pro Processor or P6T (Pentiumâ
OverDriveâ Pro Processor). The CPU speed must match with the frequency
of CLOCK GEN. It will cause system hanging up if the CLOCK GEN.'S
frequency is higher than CPU's.
CPU Installation Table:
DIP SWITCH (S1) FRE . EXT.CLK. INT.CLK. CPU Type
1 2 3 4 RATIO MHz MHz
3-5

GA-686DX
ON ON OFF OFF 2.5 60 150 PENTIUM Pro 150 MHz
OFF ON OFF OFF 2.5 66 166 PENTIUM Pro 166 MHz
ON OFF ON OFF 3 60 180 PENTIUM Pro 180 MHz
OFF OFF ON OFF 3 66 200 PENTIUM Pro 200 MHz
OFF ON ON OFF 3.5 66 233 PENTIUM Pro 233 MHz
OFF OFF OFF ON 4 66 266 PENTIUM Pro 266 MHz
MThe CPU i a en itive electric component and it can be ea ily
damaged by tatic electricity, o u er mu t keep it away from metal
urface when the CPU i in talled onto mainboard.
3.6. CMOS RTC & ISA CFG CMOS SRAM
There're RTC & CMOS SRAM on board, they have a power supply from
internal 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 ISA device system
configuration, so the system can automatically boot OS. every time.
Due to the life-time of RTC internal battery is 5 years, the user can change a
new RTC to replace old one after it can not work. The new one's brand and
type must be same with old one.
3.7. SPEAKER CONNECTOR INSTALLATION
There is always a speaker in AT system for sound purpose. The 4 - Pins
connector J1 is used to connect speaker.
The speaker can work well in both direction of connector when it is installed to
the connector J1 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 J2 on mainboard.
3.9. POWER LED & KEY LOCK CONNECTOR INSTALLATION
3-6

Hardware Installation
There are a system power LED lamp 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 J3 of mainboard in correct
direction.
3.10. GREEN FUNCTION INSTALLATION
For the purpose of power saving, there are two jumpers, J6 and J8, to make
sure the power saving function doing well.
The J8 is a indicator (green LED) for green function. If the green LED is ON,
the system is operating in green mode. The J6 is a switch to force the system
get into green mode immediately.
3.11. ATAPI DEVICE INSTALLATION
There are two Enhance PCI IDE ports (CN6,7) on board, which following
ATAPI standard SPEC. Any one IDE port can connect to two ATAPI devices
(IDE Hard Disk, CD-ROM & Tape Driver), so total four ATAPI devices can
exist in a system.
The booting Hard Disk should be the Master device of 1st IDE channel.
The J5 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 - us device is to be installed in the system, any one of four PCI -
us slots can be used if Slave PCI - us device being installed; any one of
four PCI- us slots can be used if us Master PCI- us device being installed.
3.13. KEYBOARD & PS/2 MOUSE INSTALLATION
The main board supports PS/2 connector type keyboard & Mouse (CN4).
3-7

GA-686DX
The BIOS will auto detect whether the PS/2 Mouse is installed or nor & assign
IR 12 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).
3-8