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GA - 686DX
USER'S MANUAL
Dual PENTIUMâ PCI - ISA BUS MAINBOARD
REV. 1 First Edition
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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.
IBM PC/AT, PC/XT are trademarks of International Business 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 Bell Laboratories.
DECEMBER 16, 1996 Taipei, Taiwan
TABLE OF CONTENTS
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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. QUICK 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
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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
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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 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
q Dual Intel Pentiumâ Pro Processor based PC / AT compatible mainboard.
q Two Socket 8 on board supports Pentiumâ Pro processor & P6T running
at 150-200 MHz.
q CPU L1 / L2 Write-Back cache operation.
q Supports 8 - 512 MB DRAM memory on board.
q 5 Master / Slave PCI Bus slots, 3 ISA Bus slots.
q Supports 2 channels Enhance PCI IDE ports for 4 IDE Device.
q Supports 2xCOM (16550), 1xLPT (EPP / ECP), 1x1.44MB Floppy port.
q Supports Green function, Plug & Play function.
q Licensed AWARD BIOS, FLASH EEPROM for BIOS update.
q DALLAS 12887 like RTC on board.
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GA-686DX
q ATX form factor, 6 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
Pentiumâ Pro processor 200 MHz
· DRAM
32 MB EDO
· CACHE SIZE
256KB/512 KB includeed in CPU
· DISPLAY
Matrox Millennium 2MB
· STORAGE
Onboard IDE port + Quantum FB 1280AT IDE Dirve
· O.S.
Windows95 with Display Driver at 1024 x 768 x 256
colors x 70Hz & BusMaster 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
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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
q 32 bits bus transfer mode.
q Bus Master or Slave access.
q Memory burst transfer to 132 MB/sec.
q 33 MHz operation speed.
q 10 device loading ability.
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Introduction
q CPU independent.
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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-Bus 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 MB 60~70 ns SIMM
module DRAM.
- 8 ~ 512 MB DRAM size.
- Support Fast Page / EDO DRAM access mode.
· CACHE MEMORY - 16 KB cache memory included in CPU.
- 256KB/512 KB 2nd cache in CPU.
- Support Write Back cache mode for L1/L2 Cache.
· I/O BUS SLOTS - 5 Master / Slave PCI-BUS.
- 3 16 bits ISA BUS.
· 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 MB 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 - 128KB FLASH EEPROM.
- Supports Plug & Play Function.
· DIMENSION - ATX Form Factor, 6 layers PCB.
2.2. SOFTWARE
· BIOS - Licensed AWARD BIOS.
- AT CMOS Setup, BIOS / 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).
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Specification
· Vibration - 0 to 1,000 Hz.
· Electricity - 4.9 V to 5.2 V.
- Max. 20A current at 5V.
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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 BUS 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. 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.
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 IBM-AT system board.
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GA-686DX
It is assumed that the chassis is designed for a standard IBM 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
t CN1-8 I/O Ports Connector
CN1 For Serial port1(COM A).
CN2 For LPT port.
CN3 For Serial port2 (COM B).
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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
t J1: SPEKER Connector
Pin No. Function
1 VCC
2 NC.
3 NC.
4 Output
t J2: RESET Switch (RST)
Pin No. Function
1 RESET Input
2 GND
t J3: POWER ON LED (PW-LED)
Pin No. Function
1 LED POWER (+)
2 NC
3 GND (-)
t J4: Hard Disk active LED
Pin No. Function
1 LED POWER (+)
2 LED POWER (-)
3 LED POWER (-)
4 LED POWER (+)
t J5: INFARED Connector (IR) -- Function Option
Pin No. Function
1 IR Data Output
2 GND
3 IR Data Input
4 NC
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GA-686DX
5 POWER (+)
t J6: GN-SW
Pin No. Function
Close Force system to enter Green Mode (Suspend mode).
Open Normal Operation.
t J7: 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.
t J8: GN-LED
Pin No. Function
1 LED anode (+).
2 LED cathode (-).
t JP3,4: CPU cooling FAN Power Connector
Pin No. Function
1 +12V
2 GND
t S1-1: 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 ).
t S1-2,3,4: CPU INT. / EXT. FREQ. 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
t Power: ATX POWER connector
Pin No. Function
3,5,7,13,15-17 GND
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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 MB 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.
Because 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 MB.
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) FREQ. EXT.CLK. INT.CLK. CPU Type
1 2 3 4 RATIO MHz MHz
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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
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
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 REALTIME 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
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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 - Bus device is to be installed in the system, any one of four PCI Bus slots can be used if Slave PCI - Bus device being installed; any one of
four PCI-Bus slots can be used if Bus Master PCI-Bus device being installed.
3.13. KEYBOARD & PS/2 MOUSE INSTALLATION
The main board supports PS/2 connector type keyboard & Mouse (CN4).
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GA-686DX
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).
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GA-686DX
4. BIOS CONFIGURATION
Award's BIOS ROM has a built-in Setup program that allows users to modify
the basic system configuration.
This type of information is stored in battery-backed CMOS SRAM so that it
retains the Setup information when the power is turned off.
4.1. ENTERING SETUP
Power ON the computer and press <Del> immediately will allow you to enter
Setup.
The other way to enter Setup is to power on the computer, when the below
message appears briefly at the bottom of the screen during the POST
(Power On Self Test), press <Del> key or simultaneously press <Ctrl>, <Alt>,
and <Esc> keys.
TO ENTER SETUP BEFORE BOOT PRESS CTRL-ALT-ESC OR DEL KEY
If the message disappears before you respond and you still wish to enter
Setup, restart the system to try again by turning it OFF then ON or pressing
the "RESET" bottom on the system case.
You may also restart by simultaneously press <Ctrl>,<Alt>, and <Del> keys.
If you do not press the keys at the correct time and the system does not boot,
an error message will be displayed and you will again be asked to,
PRESS F1 TO CONTINUE, CTRL-ALT-ESC OR DEL TO ENTER SETUP
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BIOS Configuration
4.2. CONTROL KEYS
Up arrow Move to previous item
Down arrow Move to next item
Left arrow Move to the item in the left hand
Right arrow Move to the item in the right hand
Esc key Main Menu - Quit and not save changes into CMOS
Status Page Setup Menu and Option Page Setup Menu Exit current page and return to Main Menu
PgUp key Increase the numeric value or make changes
PgDn key Decrease the numeric value or make changes
F1 key General help, only for Status Page Setup Menu and Option
Page Setup Menu
F2 key Change color from total 16 colors
F3 key Calendar, only for Status Page Setup Menu
F4 key Reserved
F5 key Restore the previous CMOS value from CMOS, only for
Option Page Setup Menu
F6 key Load the default CMOS value from BIOS default table, only
for Option Page Setup Menu
F7 key Load the default
F8 key Reserved
F9 key Reserved
F10 key Save all the CMOS changes, only for Main Menu
4.3. GETTING HELP
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GA-686DX
4.3.1. Main Menu
The on-line description of the highlighted setup function is displayed at the
bottom of the screen.
4.3.2. Status Page Setup Menu / Option Page Setup Menu
Press F1 to pop up a small help window that describes the appropriate keys
to use and the possible selections for the highlighted item. To exit the Help
Window press <Esc>.
4.4. THE MAIN MENU
Once you enter Award BIOS CMOS Setup Utility, the Main Menu (Figure 4.1)
will appear on the screen.
The Main Menu allows you to select from seven setup functions and two exit
choices. Use arrow keys to select among the items and press <Enter> to
accept or enter the sub-menu.
Figure 4.1: Main Menu
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BIOS Configuration
· Standard CMOS setup
This setup page includes all the items in a standard compatible BIOS.
· BIOS features setup
This setup page includes all the items of Award special enhanced features.
· Chipset features setup
This setup page includes all the items of chipset special features.
· Power management setup
This setup page includes all the items of Green function features.
· PNP/PCI configuration
This setup page includes all the configurations of PCI & PNP ISA resources.
· Integrated peripherals
This setup page includes all onboard peripherals.
· Load setup defaults
BIOS defaults indicates the most appropriate value of the system parameter
which the system would be in safe configuration.
· User password
Change, set, or disable password. It allows you to limit access to the system
and Setup, or just to Setup.
· IDE HDD auto detection
Automatically configure hard disk parameter.
· Save & exit setup
Save CMOS value changes to CMOS and exit setup.
· Exit without save
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GA-686DX
Abandon all CMOS value changes and exit setup.
4.5. STANDARD CMOS SETUP MENU
The items in Standard CMOS Setup Menu (Figure 4.2) are divided into 9
categories. Each category includes no, one or more than one setup items.
Use the arrows to highlight the item and then use the <PgUp> or <PgDn>
keys to select the value you want in each item.
Figure 4.2: Standard CMOS Setup Menu
· Date
The date format is <day>, <date> <month> <year>. Press <F3> to show the
calendar.
day The day, from Sun to Sat, determined by the BIOS and is
display-only
date The date, from 1 to 31 (or the maximum allowed in the
month)
month The month, Jan. through Dec.
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BIOS Configuration
year The year, from 1900 through 2099
· Time
The time format in <hour> <minute> <second>.
The time is calculated base on the 24-hour military-time clock.
For example, 1 p.m. is 13:00:00.
· Primary HDDs / Secondary HDDs
The category identify the types of hard disk drive C drive F 4 devices that has
been installed in the computer.
There are 45 pre-defined types and a user definable type.
Type 1 to Type 45 are pre-defined. Type User is user-definable and type Auto
will automatically detect HDD's type..
Press PgUp or PgDn to select a numbered hard disk type or type the number
and press <Enter>.
Note that the specifications of your drive must match with the drive table.
The hard disk will not work properly if you enter improper information for this
category.
If your hard disk drive type is not matched or listed, you can use Type User to
define your own drive type manually.
If you select Type User, related information is asked to be entered to the
following items.
Enter the information directly from the keyboard and press <Enter>.
Those information should be provided in the documentation form your hard disk
vendor or the system manufacturer.
CYLS. number of cylinders
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GA-686DX
HEADS number of heads
PRECOMP write precomp
LANDZONE landing zone
SECTORS number of sectors
If a hard disk has not been installed select NONE and press <Enter>.
· Drive A type / Drive B type
The category identify the types of floppy disk drive A or drive B that has been
installed in the computer.
None No floppy drive installed
360K, 5.25 in. 5-1/4 inch PC-type standard drive; 360 kilobyte
capacity.
1.2M, 5.25 in. 5-1/4 inch AT-type high-density drive; 1.2 megabyte
capacity (3-1/2 inch when 3 Mode is Enabled).
720K, 3.5 in. 3-1/2 inch double-sided drive; 720 kilobyte capacity
1.44M, 3.5 in. 3-1/2 inch double-sided drive; 1.44 megabyte
capacity.
· Floppy 3 Mode Support (for Japan Area)
Disable Normal Floppy Drive.
Drive A Drive A is 3 mode Floppy Drive.
Drive B Drive B is 3 mode Floppy Drive.
Both Drive A & B are 3 mode Floppy Drive.
· Video
The category detects the type of adapter used for the primary system monitor
that must matches your video display card and monitor.
Although secondary monitors are supported, you do not have to select the type
in setup.
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BIOS Configuration
EGA/VGA Enhanced Graphics Adapter/Video Graphics Array. For
EGA, VGA, SVGA, or PGA monitor adapters
CGA 40 Color Graphics Adapter, power up in 40 column mode
CGA 80 Color Graphics Adapter, power up in 80 column mode
MONO Monochrome adapter, includes high resolution
monochrome adapters
· Halt on
The category determines whether the computer will stop if an error is detected
during power up.
NO errors The system boot will not be stopped for any error
that may be detected
All errors Whenever the BIOS detects a non-fatal error the
system will be stopped and you will be prompted
All,But Keyboard The system boot will not stop for a keyboard error;
it will stop for all other errors
All, But Diskette The system boot will not stop for a disk error; it will
stop for all other errors
All, But Disk/Key The system boot will not stop for a keyboard or
disk error; it will stop for all other errors
· Memory
The category is display-only which is determined by POST (Power On Self
Test) of the BIOS.
Base Memory
The POST of the BIOS will determine the amount of base (or
conventional) memory installed in the system.
The value of the base memory is typically 512 K for systems with 512
K memory installed on the motherboard, or 640 K for systems
with 640 K or more memory installed on the motherboard.
Extended Memory
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The BIOS determines how much extended memory is present during
the POST.
This is the amount of memory located above 1 MB in the CPU's
memory address map.
Expanded Memory
Expanded Memory in memory defined by the Lotus/Intel/Microsoft
(LIM) standard as EMS.
Many standard DOS applications can not utilize memory above 640 K,
the Expanded Memory Specification (EMS) swaps memory
which not utilized by DOS with a section, or frame, so these
applications can access all of the system memory.
Memory can be swapped by EMS is usually 64 K within 1 MB or
memory above 1 MB, depends on the chipset design.
Expanded memory device driver is required to use memory as
Expanded Memory.
Other Memory
This refers to the memory located in the 640 K to 1024 K address
space. This is memory that can be used for different
applications.
DOS uses this area to load device drivers to keep as much base
memory free for application programs. Most use for this area is
Shadow RAM.
4.6. BIOS FEATURES SETUP
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BIOS Configuration
Figure 4.3: BIOS Features Setup
· Virus Warning
This category flashes on the screen. During and after the system boots up, any
attempt to write to the boot sector or partition table of the hard disk drive
will halt the system and the following error message will appear, in the
mean time, you can run anti-virus program to locate the problem. Default
value is Disabled.
Enabled Activate automatically when the system boots up causing a
warning message to appear when anything attempts to
access the boot sector or hard disk partition table
Disabled No warning message to appear when anything attempts to
access the boot sector or hard disk partition table
· CPU Internal Cache / External Cache
These two categories speed up memory access. However, it depends on CPU /
chipset design. The default value is Enabled.
Enabled Enable cache
Disabled Disable cache
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· Quick Power On Self Test
This category speeds up Power On Self Test (POST) after you power on the
computer. If it is set to Enable, BIOS will shorten or skip some check
items during POST. The default value is Enabled.
Enabled Enable quick POST
Disabled Normal POST
· Boot Sequence
This category determines which drive computer searches first for the disk
operating system (i.e., DOS). Default value is A,C.
A,C System will first search for floppy disk drive then hard disk drive
C,A System will first search for hard disk drive then floppy disk drive
· Swap Floppy Drive
The default value is Disabled.
Enabled Floppy A & B will be swapped under DOS
Disabled Floppy A & B will be normal definition
· Boot Up Floppy Seek
During POST, BIOS will determine if the floppy disk drive installed is 40 or 80
tracks. 360 K type is 40 tracks while 720 K, 1.2 M and 1.44 M are all 80
tracks.
The default value is Enabled.
Enabled BIOS searches for floppy disk drive to determine if it is 40
or 80 tracks. Note that BIOS can not tell from 720 K, 1.2 M
or 1.44 M drive type as they are all 80 tracks
Disabled BIOS will not search for the type of floppy disk drive by
track number. Note that there will not be any warning
message if the drive installed is 360 K
· Boot Up NumLock Status
The default value is On.
On Keypad is number keys
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BIOS Configuration
Off Keypad is arrow keys
· Typematic Rate Setting
The default value is Disabled.
Enabled Enable Keyboard typematic rate setting.
Disabled Disable Keyboard typematic rate setting.
· Typematic Rate (Chars/Sec)
The default value is 6.
6-30 Set the maximum typematic rate from 6 chars. per second
to 30 chars. per second.
· Typematic Delay (mSec)
The default value is 250.
250-1000 Set the time delay from first key to repeat the same key in
to computer.
· Security Option
This category allows you to limit access to the system and Setup, or just to
Setup. The default value is Setup.
System The system will not boot and access to Setup will be
denied if the correct password is not entered at the prompt
Setup The system will boot, but access to Setup will be denied if
the correct password is not entered at the prompt
M To disable security, select PASSWORD SETTING at Main Menu and
then you will be asked to enter password. Do not type anything and
just press <Enter>, it will disable security. Once the security is
disabled, the system will boot and you can enter Setup freely.
· Video BIOS Shadow
It determines whether video BIOS will copied to RAM, however, it is optional
from chipset design. Video Shadow will increase the video speed.
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The default value is Enable.
Enabled Video shadow is enabled
Disabled Video shadow is disabled
· PCI/VGA Palette Snoop
The default value are Disabled.
Enabled For having Video Card on ISA Bus and VGA Card on PCI
Bus.
Disabled For VGA Card only.
· OS Select For DRAM>64MB
The default value is Non-OS2.
Non-OS2 Using non-OS2 operating system.
OS2 Using OS2 operating system and DRAM>64MB.
· C8000 - CFFFF Shadow / D0000 - DFFFF Shadow
These categories determine whether optional ROM will be copied to RAM by
16 K byte. The default value are Disabled.
Enabled Optional shadow is enabled
Disabled Optional shadow is disabled
· MP SPEC. For Single CPU
The default value are Enabled.
Enabled The BIOS will Enabled Intel MP SPEC. for O.S. which
support Intel MP SPEC. system if only one processor is
installed.
Disabled The BIOS will report standard AT SPEC. to O.S. if only one
processor is installed. If two processor are installed, the
BIOS always report MP SPEC. to O.S..
NOTE: Under some O.S. with standard AT SPEC. installed, the performance
is better than the same O.S. with MP SPEC. installed.
4.7. CHIPSET FEATURES SETUP
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BIOS Configuration
Figure 4.4: Chipset Features Setup
· Auto Configuration
The default value is Disable.
Enable For 60~70ns DRAM Timing.
Disable For slow speed DRAM Timing.
· DRAM Slow speed selection
The default value is 6/70ns.
6/70ns For 60~70ns DRAM.
60ns For 60ns DRAM (The best performance).
· DRAM ECC/PARITY select
The default value is Disabled.
ECC Enable ECC function when using 36 bit DRAM Module.
PARITY Enable PARITY function when using 36 bit DRAM Module.
Disabled Disable ECC & PARITY function.
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· PCI VGA Burst Write
The default value is Disabled.
Disabled Disable this function.
Enabled Enable this function to better VGA performance;while
some brands of VGA must be disabled this function
(e.g.ET4000W32P).
· Video RAM Cacheable
The default value is Disabled.
Disabled Disable this function.
Enabled Enable this function to better VGA performance;while
some brands of VGA must be disabled this function
(e.g.ET4000W32P).
· Memory Hole At 15M-16M
The default value is Disabled.
Disabled Normal Setting.
Enabled Set Address=15~16MB remap to ISA BUS.
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BIOS Configuration
4.8. POWER MANAGEMENT SETUP
Figure 4.5: Power Management Setup
· Power Management
The default value is Enabled.
Enabled Enable Green function.
Disabled Disable Green function.
Please disable Green Function for Non-S CPU in OS/2, UNIX, Window NT &
Novell system.
· PM Control by APM
The default value is Yes.
Yes Enable software APM function.
No Disable software APM function.
· Video off Method
The default value is DPMS Support.
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V/H SYNC + Blank BIOS will turn off V/H-SYNC when gets into
Green mode for Green monitor power saving.
Blank Screen BIOS will only black monitor when gets into
Green mode.
DPMS Support BIOS will use DPMS Standard to control VGA
card. (The Green type VGA card will turn of V/HSYNC automatically.)
· Standby Mode ( for Network Card using )
The default value is Disable.
Disable Disable Standby Mode.
1 min - 1 Hour Setup the timer to enter Standby Mode.
· Suspend mode ( for CPU stop clock Mode )
The default value is Disable.
Disable Disable Suspend Mode.
1 min - 1 Hour Setup the timer to enter Suspend Mode.
· HDD Power Down
The default value is Disable.
Disable Disable HDD Power Down mode function.
1-15 mins Enable HDD enter Power Down mode between 1 to 15
mins.
· IRQX ( 3,4,5,6,7,9,10,11,12,14,15 )
The default value is On.
On The system will return to normal mode from Green Mode
when the IRQX is active.
Off The system will not return to normal mode from Green
Mode when the IRQX is active.
4.9. PNP/PCI CONFIGURATION
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BIOS Configuration
Figure 4.6: PCI Slot Configuration
· Resources Controlled by
The default value is Manual.
Manual User can set the PnP resource (I/O Address, IRQ & DMA
channels) used by legacy ISA DEVICE.
Auto BIOS automatically use these PnP resources.
· IRQ (3,4,5,7,9,10,11,12,14,15),DMA(0,1,3,5,6,7) assigned to
The default value is "Legacy ISA" or "PCI/ISA PnP".
Legacy ISA The resource is used by Legacy ISA device.
PCI/ISA PnP The resource is used by PCI/ISA PnP device (PCI or
ISA).
4.10. INTEGRATED PERIPHERALS
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Figure 4.7: Load Setup Defaults
· IDE HDD Block Mode
The default value is Enabled.
Enabled Enable IDE HDD Block Mode
Disabled Disable IDE HDD Block Mode
· IDE Primary Master PIO (for onboard IDE 1st channel).
The default value is Auto.
Auto BIOS will automatically defect the IDE HDD Accessing
mode.
Mode0~4 Manually set the IDE Accessing mode.
· IDE Primary Slave PIO (for onboard IDE 1st channel).
The default value is0 Auto.
Auto BIOS will automatically defect the IDE HDD Accessing
mode.
Mode0~4 Manually set the IDE Accessing mode.
· IDE Secondary Master PIO (for onboard IDE 2nd channel).
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BIOS Configuration
The default value is Auto.
Auto BIOS will automatically defect the IDE HDD Accessing
mode.
Mode0~4 Manually set the IDE Accessing mode.
· IDE Secondary Slave PIO (for onboard IDE 2nd channel).
The default value is Auto.
Auto BIOS will automatically defect the IDE HDD Accessing
mode.
Mode0~4 Manually set the IDE Accessing mode.
· On-Chip Primary IDE
The default value is Enabled.
Enabled Enable onboard 1st channel IDE port.
Disabled Disable onboard 1st channel IDE port.
· On-Chip Secondary IDE
The default value is Enabled.
Enabled Enable onboard 2nd channel IDE port.
Disabled Disable onboard 2nd channel IDE port.
· PCI Slot IDE 2nd Channel
The default value is Enabled.
Enabled Enable PCI BUS DEVICE's 2nd IDE Channel
Disabled Disable PCI BUS DEVICE's 2nd IDE Channel
· Onboard FDD Controller
The default value is Enabled.
Enabled Enable onboard FDD port.
Disabled Disable onboard FDD port.
· Onboard Serial Port 1
The default value is COM1/3F8.
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COM1/3F8 Enable onboard Serial port A and address is 3F8H.
COM2/2F8 Enable onboard Serial port A and address is 2F8H.
COM3/3E8 Enable onboard Serial port A and address is 3E8H.
COM4/2E8 Enable onboard Serial port A and address is 2E8H.
Disabled Disable onboard Serial port A.
· Onboard Serial Port 2
The default value is COM2/2F8.
COM1/3F8 Enable onboard Serial port B and address is 3F8H.
COM2/2F8 Enable onboard Serial port B and address is 2F8H.
COM3/3E8 Enable onboard Serial port B and address is 3E8H.
COM4/2E8 Enable onboard Serial port B and address is 2E8H.
Disabled Disable onboard Serial port B.
· Onboard Parallel port
The default value is 378H/IRQ7.
378H Enable onboard LPT port and address is 378H/IRQ7.
278H Enable onboard LPT port and address is 278H/IRQ5.
Disabled Disable onboard LPT port.
3BCH Enable onboard LPT port and address is 3BCH/IRQ7.
· Onboard Parallel Mode
The default value is SPP.
SPP Using Parallel port as Normal Printer Port.
EPP Using Parallel port as Enhanced Parallel Port.
ECP Using Parallel port as Extended Capabilities Port.
ECP+EPP Using Parallel port as ECP & EPP mode.
· USB Controller
The default value is Disabled.
Disabled Disable the onboard USB function.
Enabled Enable the onboard USB function.
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BIOS Configuration
4.11. LOAD SETUP DEFAULTS
Figure 4.7: Load Setup Defaults
· Load SETUP Defaults
To load SETUP defaults value to CMOS SRAM, enter "Y". If not, enter "N".
M If there is any problem occurred, loading SETUP DEFAULTS step is
recommended.
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4.12. USER PASSWORD
When you select this function, the following message will appear at the center
of the screen to assist you in creating a password.
ENTER PASSWORD
Figure 4.8: Password Setting
Type the password, up to eight characters, and press <Enter>. The password
typed now will clear and previously entered password from CMOS memory.
You will be asked to confirm the password. Type the password again and
press <Enter>. You may also press <Esc> to abort the selection and not enter
a password.
To disable password, just press <Enter> when you are prompted to enter
password. A message will confirm the password being disabled. Once the
password is disabled, the system will boot and you can enter Setup freely.
PASSWORD DISABLED
If you select System at Security Option of BIOS Features Setup Menu, you
will be prompted for the password every time the system is rebooted or any
time you try to enter Setup. If you select Setup at Security Option of BIOS
Features Setup Menu, you will be prompted only when you try to enter Setup.
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BIOS Configuration
4.13. IDE HDD AUTO DETECTION
Figure 4.9: IDE HDD Auto Detection
Type "Y" will accept the H.D.D. parameter reported by BIOS.
Type "N" will keep the old H.D.D. parameter setup. If the hard disk cylinder
NO. is over 1024, then the user can select LBA mode or LARGER mode for
DOS partition LARGE than 528 MB.
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4.14. SAVE & EXIT SETUP
Figure 4.10: Save & Exit Setup
Type "Y" will quit the Setup Utility and save the user setup value to RTC
CMOS SRAM.
Type "N" will return to Setup Utility.
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BIOS Configuration
4.15. EXIT WITHOUT SAVING
Figure 4.11: Exit Without Saving
Type "Y" will quit the Setup Utility without saving to RTC CMOS SRAM.
Type "N" will return to Setup Utility.
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AT Technical Information
5. AT TECHNICAL INFORMATION
5.1. I/O BUS CONNECTOR PIN OUT
5.1.1. ISA SLOT PIN OUT
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5.1.2. PCI - BUS SLOT PIN OUT
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AT Technical Information
5.2. I/O & MEMORY MAP
MEMORY MAP:
[0000000-009FFFF] System memory used by DOS and application program.
[00A0000-00BFFFF] Display buffer memory for VGA/ EGA/CGA/MONOCHROME adapter.
[00C0000-00DFFFF] Reserved for I/O device BIOS ROM or RAM buffer.
[00E0000-00EFFFF] Reserved for PCI device ROM.
[00F0000-00FFFFF] System BIOS ROM.
[0100000-BFFFFFF] System extension memory.
I/O MAP:
[000-01F] DMA controller.(Master)
[020-021] INTERRUPT controller.(Master)
[022-023] CHIPSET control registers I/O ports.
[040-05F] TIMER control registers.
[060-06F] KEYBOARD interface controller.(8042)
[070-07F] RTC ports & CMOS I/O ports.
[080-09F] DMA register.
[0A0-0BF] INTERRUPT controller.(Slave)
[0C0-0DF] DMA controller.(Slave)
[0F0-0FF] MATH COPROCESSOR
[1F0-1F8] HARD DISK controller.
[278-27F] PARALLEL port-2.
[2B0-2DF] GRAPHICS adapter controller.
[2F8-2FF] SERIAL port-2.
[360-36F] NETWORK ports.
[378-37F] PARALLEL port-1
[3B0-3BF] MONOCHROME & PRINTER adapter.
[3C0-3CF] EGA adapter.
[3D0-3DF] CGA adapter.
[3F0-3F7] FLOPPY DISK controller.
[3F8-3FF] SERIAL port-1.
5.3. TIMER & DMA CHANNELS MAP
TIMER MAP: TIMER Channel-0 System timer interrupt
TIMER Channel-1 DRAM REFRESH request
TIMER Channel-2 SPEAKER tone generator
DMA CHANNELS: DMA Channel-0 Available
DMA Channel-1 IBM SDLC
DMA Channel-2 FLOPPY DISK adapter
DMA Channel-3 Available
DMA Channel-4 Cascade for DMA controller 1
DMA Channel-5 Available
DMA Channel-6 Available
DMA Channel-7 Available
5.4. INTERRUPT MAP
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NMI: Parity check error
IRQ (H/W): 0 System TIMER interrupt from TIMER-0
1 KEYBOARD output buffer full
2 Cascade for IRQ 8-15
3 SERIAL port 2
4 SERIAL port 1
5 PARALLEL port 2
6 FLOPPY DISK adapter
7 PARALLEL port 1
8 RTC clock
9 Available
10 Available
11 Available
12 Available
13 MATH coprocessor
14 HARD DISK adapter
15 Available
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AT Technical Information
5.5. RTC & CMOS RAM MAP
RTC & CMOS: 00 Seconds
01 Second alarm
02 Minutes
03 Minutes alarm
04 Hours
05 Hours alarm
06 Day of week
07 Day of month
08 Month
09 Year
0A Status register A
0B Status register B
0C Status register C
0D Status register D
0E Diagnostic status byte
0F Shutdown byte
10 FLOPPY DISK drive type byte
11 Reserve
12 HARD DISK type byte
13 Reserve
14 Equipment byte
15 Base memory low byte
16 Base memory high byte
17 Extension memory low byte
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18 Extension memory high byte
19-2d
2E-2F
30 Reserved for extension memory low byte
31 Reserved for extension memory high byte
32 DATE CENTURY byte
33 INFORMATION FLAG
34-3F Reserve
40-7f Reserved for CHIPSET SETTING DATA
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GA-686DX
APPENDIX A: POST MESSAGE
When the BIOS encounters an error that requires the user to correct
something, either a beep code will sound or a message will be displayed in a
box in the middle of the screen and the message PRESS F1 TO CONTINUE,
CTRL-ALT-ESC OR DEL TO ENTER SETUP will be shown in the information
box at the bottom.
· POST BEEP
Currently there is only one beep code in BIOS. This code indicates that a video
error has occurred and the BIOS cannot initialize the video screen to
display any additional information. This beep code consists of a single
long beep followed by two short beeps.
· ERROR MESSAGE
Once or more of the following messages may be displayed if the BIOS detects
an error during the POST. This list includes message for both the ISA
and the EISA BIOS.
Ö CMOS BATTERY HAS FAILED
CMOS battery is no longer functional. It should be replaced.
Ö CMOS CHECKSUM ERROR
Checksum of CMOS is incorrect. This can indicate that CMOS has become
corrupt. This error may have been caused by a weak battery. Check the
battery and replace if necessary.
Ö DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER
No boot device was found. Insert a system disk into Drive A: and press <Enter>.
If you assumed the system would boot from the hard drive, make sure the
controller is inserted correctly and all cables are properly attached. Also
be sure the disk is formatted as a boot device. Then reboot the system.
Ö DISKETTE DRIVES OR TYPES MISMATCH ERROR - RUN SETUP
Type of diskette drive installed in the system is different from the CMOS
definition. Run Setup to re-configure the drive type correctly.
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Appendix A: Post Message
Ö DISPLAY SWITCH IS SET INCORRECTLY
Display switch on the motherboard can be set to either monochrome or color.
This indicates the switch is set to a different setting than indicated in
Setup.
Determine which setting is correct, and then either turn off the system and
change the jumper, or enter Setup and change the VIDEO selection.
Ö DISPLAY TYPE HAS CHANGED SINCE LAST BOOT
Since last powering off the system, the display adapter has been changed. You
must configure the system for the new display type.
Ö EISA Configuration Checksum Error
PLEASE RUN EISA CONFIGURATION UTILITY
The EISA non-volatile RAM checksum is incorrect or cannot correctly read the
EISA slot. This can indicate either the EISA non-volatile memory has
become corrupt or the slot has configured incorrectly. Also be sure the
card is installed firmly in the slot.
Ö EISA Configuration Is Not Complete
PLEASE RUN EISA CONFIGURATION UTILITY
The slot configuration information stored in the EISA non-volatile memory is
incomplete.
F When either of these errors appear, the system will boot in ISA mode,
which allows you to run the EISA Configuration Utility.
Ö ERROR ENCOUNTERED INITIALIZING HARD DRIVE
Hard drive cannot be initialized. Be sure the adapter is installed correctly and all
cables are correctly and firmly attached. Also be sure the correct hard
drive type is selected in Setup.
Ö ERROR INITIALIZING HARD DISK CONTROLLER
Cannot initialize controller. Make sure the cord is correctly and firmly installed in
the bus. Be sure the correct hard drive type is selected in Setup. Also
check to see if any jumper needs to be set correctly in the hard drive.
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Ö FLOPPY DISK CNTRLR ERROR OR NO CNTRLR PRESENT
Cannot find or initialize the floppy drive controller. Make sure the controller is
installed correctly and firmly. If there are no floppy drives installed, be
sure the Diskette Drive selection in Setup is set to NONE.
Ö Invalid EISA Configuration
PLEASE RUN EISA CONFIGURATION UTILITY
The non-volatile memory containing EISA configuration information was
programmed incorrectly or has become corrupt. Re-run EISA
configuration utility to correctly program the memory.
F When this error appears, the system will boot in ISA mode, which allows
you to run the EISA Configuration Utility.
Ö KEYBOARD ERROR OR NO KEYBOARD PRESENT
Cannot initialize the keyboard. Make sure the keyboard is attached correctly
and no keys are being pressed during the boot.
If you are purposely configuring the system without a keyboard, set the error
halt condition in Setup to HALT ON ALL, BUT KEYBOARD. This will
cause the BIOS to ignore the missing keyboard and continue the boot.
Ö Memory Address Error at ...
Indicates a memory address error at a specific location. You can use this
location along with the memory map for your system to find and replace
the bad memory chips.
Ö Memory parity Error at ...
Indicates a memory parity error at a specific location. You can use this location
along with the memory map for your system to find and replace the bad
memory chips.
Ö MEMORY SIZE HAS CHANGED SINCE LAST BOOT
Memory has been added or removed since the last boot. In EISA mode use
Configuration Utility to re-configure the memory configuration.
In ISA mode enter Setup and enter the new memory size in the memory fields.
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Appendix A: Post Message
Ö Memory Verify Error at ...
Indicates an error verifying a value already written to memory. Use the location
along with your system's memory map to locate the bad chip.
Ö OFFENDING ADDRESS NOT FOUND
This message is used in conjunction with the I/O CHANNEL CHECK and RAM
PARITY ERROR messages when the segment that has caused the
problem cannot be isolated.
Ö OFFENDING SEGMENT:
This message is used in conjunction with the I/O CHANNEL CHECK and RAM
PARITY ERROR messages when the segment that has caused the
problem has been isolated.
Ö PRESS A KEY TO REBOOT
This will be displayed at the bottom screen when an error occurs that requires
you to reboot. Press any key and the system will reboot.
Ö PRESS F1 TO DISABLE NMI, F2 TO REBOOT
When BIOS detects a Non-maskable Interrupt condition during boot, this will
allow you to disable the NMI and continue to boot, or you can reboot the
system will the NMI enabled.
Ö RAM PARITY ERROR - CHECKING FOR SEGMENT ...
Indicates a parity error in Random Access Memory.
Ö Should Be Empty But EISA Board Found
PLEASE RUN EISA CONFIGURATION UTILITY
A valid board ID was found in a slot that was configured as having no board ID.
F When this error appears, the system will boot in ISA mode, which allows
you to run the EISA Configuration Utility.
Ö Should Have EISA Board But Not Found
PLEASE RUN EISA CONFIGURATION UTILITY
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GA-686DX
The board installed is not responding to the ID request, or no board ID has been
found in the indicated slot.
F When this error appears, the system will boot in ISA mode, which allows
you to run the EISA Configuration Utility.
Ö Slot Not Empty
Indicates that a slot designated as empty by the EISA Configuration Utility
actually contains a board.
F When this error appears, the system will boot in ISA mode, which allows
you to run the EISA Configuration Utility.
Ö SYSTEM HALTED, (CTRL-ALT-DEL) TO REBOOT ...
Indicates the present boot attempt has been aborted and the system must be
rebooted. Press and hold down the CTRL and ALT keys and press DEL.
Ö Wrong Board In Slot
PLEASE RUN EISA CONFIGURATION UTILITY
The board ID does not match the ID stored in the EISA non-volatile memory.
F When this error appears, the system will boot in ISA mode, which allows
you to run the EISA Configuration Utility.
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Appendix B: Post Codes
APPENDIX B: POST CODES
F EISA POST codes are typically output to port address 300h. ISA POST
codes are typically output to port address 80h.
POST Name Description
C0 Turn Off Chipset
Cache
OEM Specific-Cache control.
1 Processor Test 1 Processor Status (1 FLAGS) Verification.
Test the following processor status flags
carry, zero, sign, overflow,
The BIOS will set each of these flags, verify they are
set, then turn each flag off and verify it is off.
2 Processor Test 2 Read/Write/Verify all CPU registers except SS, SP,
and BP with data pattern FF and 00.
3 Initialize Chips Disable NMI, PIE, AIE, UEI, SQWV.
Disable video, parity checking, DMA.
Reset math coprocessor.
Clear all page registers, CMOS shutdown byte.
Initialize timer 0, 1, and 2, including set EISA timer to
a known state.
Initialize DMA controllers 0 and 1.
Initialize interrupt controllers 0 and 1.
Initialize EISA extended registers.
4 Test Memory
Refresh Toggle
RAM must be periodically refreshed in order to keep
the memory from decaying. This function assures
that the memory refresh function is working properly.
5 Blank video,
Initialize keyboard
Keyboard controller initialization.
6 Reserved
7 Test CMOS
Interface and
Battery Status
Verifies CMOS is working correctly, detects bad
battery.
BE Chipset Default
Initialization
Program chipset registers with power on BIOS
defaults.
C1 Memory presence
test
OEM Specific-Test to size on-board memory.
C5 Early Shadow OEM Specific-Early Shadow enable for fast boot.
C6 Cache presence
test
External cache size detection.
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8 Setup low memory Early chip set initialization.
Memory presence test.
OEM chip set routines.
Clear low 64 K of memory.
Test first 64 K memory.
9 Early Cache
Initialization
Cyrix CPU initialization.
Cache initialization.
A Setup Interrupt
Vector Table
Initialize first 120 interrupt vectors with
SPURIOUS_INT-HDLR and initialize INT 00h-1Fh
according to INT_TBL.
B Test CMOS RAM
Checksum
Test CMOS RAM Checksum, if bad, or insert key
pressed, load defaults.
C Initialize keyboard Detect type of keyboard controller (optional).
Set NUM_LOCK status.
D Initialize Video
Interface
Detect CPU clock.
Read CMOS location 14h to find out type of video in
use.
Detect and Initialize Video Adapter.
E Test Video
Memory
Test video memory, write sign-on message to
screen.
Setup shadow RAM - Enable shadow according to
Setup.
F Test DMA
Controller 0
BIOS checksum test.
Keyboard detect and initialization.
10 Test DMA
Controller 1
11 Test DMA Page
registers
Test DMA Page Registers.
12-13 Reserved
14 Test Timer
Counter 2
Test 8254 Timer 0 Counter 2.
15 Test 8259-1 Mask
Bits
Verify 8259 Channel 1 masked interrupts by
alternately turning off and on the interrupt lines.
16 Test 8259-2 Mask
Bits
Verify 8259 Channel 2 masked interrupts by
alternately turning off and on the interrupt lines.
17 Test Stuck 8259's
Interrupt Bits
Turn off interrupts then verify no interrupt mask
register is on.
18 Test 8259
Interrupt
Functionality
Force an interrupt and verify the interrupt occurred.
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Appendix B: Post Codes
19 Test Stuck NMI
Bits (Parity/IO
Check)
Verify NMI can be cleared.
1A Display CPU clock.
1B-1E Reserved
1F Set EISA Mode If EISA non-volatile memory checksum is good,
execute EISA initialization. If not, execute ISA tests
an clear EISA mode flag.
Test EISA Configuration Memory Integrity
(checksum & communication interface).
20 Enable Slot 0 Initialize slot 0 (System Board).
21-2F Enable Slots 1-15 Initialize slot 1 through 15.
30 Size Base and
Extended Memory
Size base memory from 256 K to 640 K extended
memory above 1 MB.
31 Test Base and
Extended Memory
Test base memory from 256 K to 640 K and
extended memory above 1 MB using various
patterns.
F This will be skipped in EISA mode and can be
"skipped" with ESC key in ISA mode.
32 Test EISA
Extended Memory
If EISA Mode flag is set then test EISA memory
found in slots initialization.
F This will be skipped in ISA mode and can be
"skipped" with ESC key in EISA mode.
33-3B Reserved
3C Setup Enabled
3D Initialize & Install
Mouse
Detect if mouse is present, initialize mouse, install
interrupt vectors.
3E Setup Cache
Controller
Initialize cache controller.
3F Reserved
BF Chipset
Initialization
Program chipset registers with Setup values.
40 Display virus protest disable or enable.
41 Initialize Floppy
Drive & Controller
Initialize floppy disk drive controller and any drives.
42 Initialize Hard
Drive & Controller
Initialize hard drive controller and any drives.
43 Detect & Initialize
Serial/Parallel
Ports
Initialize any serial and parallel ports (also game
port).
44 Reserved
B-3
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GA-686DX
45 Detect & Initialize
Math Coprocessor
Initialize math coprocessor.
46 Reserved
47 Reserved
48-4D Reserved
4E Manufacturing
POST Loop or
Display Messages
Reboot if Manufacturing POST Loop pin is set.
Otherwise display any messages (i.e., any non-fatal
errors that were detected during POST) and enter
Setup.
4F Security Check Ask password security (optional).
50 Write CMOS Write all CMOS values back to RAM and clear
screen.
51 Pre-boot Enable Enable parity checker.
Enable NMI, Enable cache before boot.
52 Initialize Option
ROMs
Initialize any option ROMs present from C8000h to
EFFFFh.
F When FSCAN option is enabled, will initialize
from C8000h to F7FFFh.
53 Initialize Time
Value
Initialize time value in 40h: BIOS area.
60 Setup Virus
Protect
Setup virus protect according to Setup
61 Set Boot Speed Set system speed for boot
62 Setup NumLock Setup NumLock status according to Setup
63 Boot Attempt Set low stack.
Boot via INT 19h.
B0 Spurious If interrupt occurs in protected mode.
B1 Unclaimed NMI If unmasked NMI occurs, display
Press F1 to disable NMI, F2 reboot.
E1-EF Setup Pages E1 - Page 1, E2 - Page 2, etc.
FF Boot
B-4
Page 62
Appendix C: BIOS Default Drive Table
APPENDIX C: BIOS DEFAULT DRIVE TABLE
Type Size
(MB)
Cylinders Heads Sectors Write /
Precomp
Land
Zone
Example Model
1 10 MB 306 4 17 128 305 TEAC SD510
MMI 112, 5412
2 20 MB 615 4 17 300 615 Seagate ST225,
ST4026
3 31 MB 615 6 17 300 615
4 62 MB 940 8 17 512 940
5 47 MB 940 6 17 512 940
6 20 MB 615 4 17 65535 615 Seagate ST125
Tandon TM262
7 31 MB 462 8 17 256 511
8 30 MB 733 5 17 65535 733 Tandon TM703
9 112 MB 900 15 17 65535 901
10 20 MB 820 3 17 65535 820
11 35 MB 855 5 17 65535 855
12 50 MB 855 7 17 65535 855
13 20 MB 306 8 17 128 319 Disctron526,
MMI M125
14 43 MB 733 7 17 65535 733
16 20 MB 612 4 17 0 663 Microscience
HH725
Syquest3250,
3425
17 41 MB 977 5 17 300 977
18 57 MB 977 7 17 65535 977
19 60 MB 1024 7 17 512 1023
20 30 MB 733 5 17 300 732
21 43 MB 733 7 17 300 732
22 30 MB 733 5 17 300 733 Seagate ST4038
23 10 MB 306 4 17 0 336
24 54 MB 925 7 17 0 925 Seagate ST4051
25 69 MB 925 9 17 65535 925 Seagate ST4096
26 44 MB 754 7 17 754 754 Maxtor2085
C-1
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GA-686DX
27 69 MB 754 11 17 65535 754 Maxtor2140,
Priam S14
28 41 MB 699 7 17 256 699 Maxtor2190,
Priam S19
29 68 MB 823 10 17 65535 823 Maxtor1085
Micropolis1325
30 53 MB 918 7 17 918 918 Maxtor1105,
1120, 4780
31 94 MB 1024 11 17 65535 1024 Maxtor1170
32 128 MB 1024 15 17 65535 1024 CDC9415
33 43 MB 1024 5 17 1024 1024
34 10 MB 612 2 17 128 612
35 77 MB 1024 9 17 65535 1024
36 68 MB 1024 8 17 512 1024
37 41 MB 615 8 17 128 615
38 25 MB 987 3 17 987 987
39 57 MB 987 7 17 987 987 Maxtor1140,
4380
40 41 MB 820 6 17 820 820 Seagate ST251
41 41 MB 977 5 17 977 977 Seagate ST4053
Miniscribe3053/
6053
42 41 MB 981 5 17 981 981 Miniscribe3053/
6053 RLL
43 48 MB 830 7 17 512 830 Miniscribe 3650
44 69 MB 830 10 17 65535 830 Miniscribe 3650
RLL
45 114 MB 917 15 17 65535 918 Conner CP3104
46 152 MB 1224 15 17 65535 1223 Conner CP3204
User
C-2
Page 64
Appendix D: Problem Sheet
APPENDIX D: PROBLEM SHEET
1. Customer Data
Name
Tel. No.
Address
Fax. No.
Purchase Date
2. Mainboard Date
Model NO.
GA- Rev. No.
Serial No.
3. System Configuration
CPU Type:
CPU Brand:
CPU Speed:
DRAM Type:
q 1 q 2 q 4 q 8 q 16 q 32 MB
DRAM Speed:
q 80 q 70 q 60 ns
DRAM Total Size:
MB
DRAM Brand:
SRAM Size:
q 64KB q 128 KB q 256 KB q 512 KB
SRAM Part No.
TAG: DATA:
Video Card:
Video Chip or Brand:
Floppy Drive A Capacity & Brand:
Floppy Drive B Capacity & Brand:
Storage Controller Type
q MFM q RLL q IDE q EDSI q SCSI
Hard Drive C Brand & Type:
Hard Drive D Brand & Type:
LAN Controller Type:
LAN Card Brand & Model:
Serial / Parallel Chip Brand & Model:
Mouse Brand & Model:
O.S.
q DOS q OS/2 q NETWARE q UNIX / XENIX Ver.:
4. AUTOEXEC.BAT & CONFIG.SYS File:
5. Problem Description:
D-1
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GA-686DX
R-01-01-061216
D-2
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