AOpen MK79G User Manual
MMKK7799GG OOnnlliinnee MMaannuuaall
Overview
MK79G
DOC. NO.: MK79G-OL-E0209A
1
Installation
Hardware
Drivers &
Utilities
BIOS Setup
AWARD
Glossary
Troubleshooting &
Technical Support
MMKK7799GG OOnnlliinnee MMaannuuaall
WWhhaatt’’ss iinn tthhiiss mmaannuuaall
MK79G........................................................................................................................................... 1
What’s in this manual ...................................................................................................................................................... 2
You Must Notice .............................................................................................................................................................. 8
Before You Start..............................................................................................................................................................9
Overview ....................................................................................................................................................................... 10
Feature Highlight........................................................................................................................................................... 11
Quick Installation Procedure .........................................................................................................................................15
Motherboard Map .......................................................................................................................................................... 16
Block Diagram ...............................................................................................................................................................17
Hardware Installation................................................................................................................18
JP14 Clear CMOS Data ................................................................................................................................................ 19
CPU Installation ............................................................................................................................................................ 20
AOpen Overheat Protection (O.H.P.) Technology .......................................................................................................... 22
CPU Jumper-less Design .............................................................................................................................................. 23
CPU and Housing Fan Connector .................................................................................................................................28
JP27/28 USB Keyboard/Mouse Wakeup Enable/Disable Jumper .................................................................................. 29
DIMM Sockets ............................................................................................................................................................... 30
STBY LED .....................................................................................................................................................................32
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Front Panel Connector .................................................................................................................................................. 33
ATX Power Connector...................................................................................................................................................34
AC Power Auto Recovery .............................................................................................................................................. 35
IDE and Floppy Connector ............................................................................................................................................ 36
S/PDIF (Sony/Philips Digital Interface) Connector......................................................................................................... 38
Super 5.1 Channel Audio Effect .................................................................................................................................... 39
TV Output Connector .................................................................................................................................................... 40
IrDA Connector .............................................................................................................................................................41
AGP (Accelerated Graphic Port) 8X Expansion Slot......................................................................................................42
AGP Protection Technology and AGP LED....................................................................................................................43
Support 10/100 Mbps LAN onboard ..............................................................................................................................44
PC99 Color Coded Back Panel .....................................................................................................................................45
COM2 Connector ..........................................................................................................................................................46
Support 2nd USB Port .................................................................................................................................................... 47
IEEE 1394 Connectors ..................................................................................................................................................48
Chassis Intrusion Sensor Connector ............................................................................................................................. 49
CD Audio Connector ..................................................................................................................................................... 50
AUX-IN Connector.........................................................................................................................................................51
Front Audio Connector .................................................................................................................................................. 52
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Battery-less and Long Life Design................................................................................................................................. 53
CPU Over-current Protection......................................................................................................................................... 54
AOConfig Utility .............................................................................................................................................................55
Resetable Fuse ............................................................................................................................................................. 57
2200μF Low ESR Capacitor.........................................................................................................................................58
Layout (Frequency Isolation Wall) ................................................................................................................................. 59
Enlarged Aluminum Heatsink ........................................................................................................................................ 60
Open JukeBox Player.................................................................................................................................................... 61
Vivid BIOS technology...................................................................................................................................................65
Driver and Utility .......................................................................................................................66
Auto-run Menu from Bonus CD Disc ............................................................................................................................. 67
nVIDIA nForce Drivers .................................................................................................................................................. 68
Installing ATA133 Driver in Existing Windows XP System ............................................................................................. 69
The noise is gone!! ---- SilentTek .................................................................................................................................. 73
Phoenix Award BIOS..................................................................................................................76
How To Use Phoenix Award™ BIOS Setup Program .....................................................................................................77
How To Enter BIOS Setup ............................................................................................................................................. 79
BIOS Upgrade under Windows environment .................................................................................................................80
Overclocking.............................................................................................................................. 82
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VGA Card & Hard Disk .................................................................................................................................................. 83
Glossary ....................................................................................................................................84
AC97 ............................................................................................................................................................................. 84
ACPI (Advanced Configuration & Power Interface) .......................................................................................................84
AGP (Accelerated Graphic Port).................................................................................................................................... 84
AMR (Audio/Modem Riser)............................................................................................................................................ 85
AOpen Bonus Pack CD .................................................................................................................................................85
APM (Advanced Power Management)...........................................................................................................................85
ATA (AT Attachment) ..................................................................................................................................................... 85
ATA/66 ..........................................................................................................................................................................85
ATA/100 ........................................................................................................................................................................ 86
ATA/133 ........................................................................................................................................................................ 86
BIOS (Basic Input/Output System) ................................................................................................................................ 86
Bus Master IDE (DMA mode) ........................................................................................................................................ 86
CNR (Communication and Networking Riser)................................................................................................................ 87
CODEC (Coding and Decoding) ....................................................................................................................................87
DDR (Double Data Rate) RAM ...................................................................................................................................... 87
DIMM (Dual In Line Memory Module)............................................................................................................................87
DMA (Direct Memory Access)........................................................................................................................................ 88
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ECC (Error Checking and Correction) ........................................................................................................................... 88
EDO (Extended Data Output) Memory ..........................................................................................................................88
EEPROM (Electronic Erasable Programmable ROM)....................................................................................................88
EPROM (Erasable Programmable ROM)....................................................................................................................... 89
EV6 Bus ........................................................................................................................................................................ 89
FCC DoC (Declaration of Conformity) ........................................................................................................................... 89
FC-PGA (Flip Chip-Pin Grid Array) ................................................................................................................................89
Flash ROM .................................................................................................................................................................... 90
FSB (Front Side Bus) Clock .......................................................................................................................................... 90
I2C Bus ..........................................................................................................................................................................90
IEEE 1394.....................................................................................................................................................................91
Parity Bit .......................................................................................................................................................................91
PBSRAM (Pipelined Burst SRAM)................................................................................................................................. 91
PC-100 DIMM ............................................................................................................................................................... 92
PC-133 DIMM ............................................................................................................................................................... 92
PC-1600 / PC-2100/ PC-2700 / PC-3200 DDR DRAM................................................................................................... 92
PCI (Peripheral Component Interface) Bus ...................................................................................................................92
PDF Format................................................................................................................................................................... 93
PnP (Plug and Play) ......................................................................................................................................................93
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POST (Power-On Self Test) ..........................................................................................................................................93
RDRAM (Rambus DRAM) .............................................................................................................................................93
RIMM (Rambus Inline Memory Module) ........................................................................................................................94
SDRAM (Synchronous DRAM) ...................................................................................................................................... 94
Shadow E2PROM .......................................................................................................................................................... 94
SIMM (Single In Line Memory Module) .........................................................................................................................94
SMBus (System Management Bus) ............................................................................................................................... 95
SPD (Serial Presence Detect) .......................................................................................................................................95
Ultra DMA ..................................................................................................................................................................... 95
USB (Universal Serial Bus) ........................................................................................................................................... 96
VCM (Virtual Channel Memory).....................................................................................................................................96
ZIP file........................................................................................................................................................................... 96
Troubleshooting......................................................................................................................... 97
Technical Support ...................................................................................................................101
Product Registration ...............................................................................................................104
How to Contact Us .................................................................................................................. 105
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YYoouu MMuusstt NNoottiiccee
Adobe, the Adobe logo, Acrobat is trademarks of Adobe Systems Incorporated.
AMD, the AMD logo, Athlon and Duron are trademarks of Advanced Micro Devices, Inc.
Intel, the Intel logo, Intel Celeron, Pentium II, Pentium III, Pentium 4 are trademarks of Intel Corporation.
Microsoft, Windows, and Windows logo are either registered trademarks or trademarks of Microsoft Corporation in the United
States and/or other countries.
All product and brand names used on this manual are used for identification purposes only and may be the registered
trademarks of their respective owners.
All of the specifications and information contained in this manual are subject to change without notice. AOpen reserves the right
to revise this publication and to make reasonable changes. AOpen assumes no responsibility for any errors or inaccuracies that
may appear in this manual, including the products and software described in it.
This documentation is protected by copyright law. All rights are reserved.
No part of this document may be used or reproduced in any form or by any means, or stored in a database or retrieval
system without prior written permission from AOpen Corporation.
Copyright
©
1996-2002, AOpen Inc. All Rights Reserved.
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BBeeffoorree YYoouu SSttaarrtt
This Online Manual will introduce to the user how this product is installed. All useful information will be described in later
chapters. Please keep this manual carefully for future upgrades or system configuration changes. This Online Manual is saved
in PDF format
get free download from Adobe web site
Although this Online Manual is optimized for screen viewing, it is still capable for hardcopy printing, you can print it by A4 paper
size and set 2 pages per A4 sheet on your printer. To do so, choose File > Page Setup and follow the instruction of your printer
driver.
Thanks for the help of saving our earth.
, we recommend using Adobe Acrobat Reader 4.0 for online viewing, it is included in Bonus CD disc or you can
.
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OOvveerrvviieeww
Thank you for choosing AOpen MK79G. The MK79G is based on AMD® Socket 462 motherboard with micro ATX form factor
featuring the NVIDIA nForce™2
Athlon™ & Duron™ and AthlonXP™ processor (with CPU Overheat Protection circuit to Athlon™XP CPU only) and
333/266/200MHz EV6 system bus. For better graphic performance, GeForce4 MX Graphics is integrated into the NVIDIA
nForce2 for delivering fastest speed, multi-display functionality and multiple configurations of CRTs and TVs. Hence, MK79G
supports DVO / TV-OUT function which supports DVO or TV-Out card, or 1.5V AGP interface with AGP 3.0 8x and 4x with Fast
Write data transfer, and AGP2.0 for 4x, 2x and 1x mode, which
pipelined spilt-transaction long burst transfer up to 2.1GB/sec.
This motherboard comes with high speed of 6.4Gb/sec
HyperTransport, the Isochronous Link between NVIDIA Crush18G
and MCP2. DDR400
applied to the maximum memory size of up to 2GB. The on-board
IDE controller supports Ultra DMA
transfer rate up to 133MB/s. Besides, the MK79G has an AC97
CODEC RealTek ALC650
performance and magic surround stereo sound to let people enjoy
working with it. More than that, this motherboard supports USB
2.0 function with a fancy speed of up to 480Mbps, and IEEE 1394
controller to provides data transfer rate up to 400Mbps. Now,
enjoy all features from AOpen MK79G.
. As high performance chipset built in the M/B, the MK79G supports AMD® Socket 462 series
, DDR333 and DDR266 DDR RAM can be
66/100/133 mode and the
chipset onboard for provides high
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FFeeaattuurree HHiigghhlliigghhtt
CPU
Supports AMD® Socket 462 series CPU with 200MHz, 266MHz and 333MHz, EV6 Bus designed for Socket 462 technology.
Athlon: 600MHz~1.4GHz
Duron: 600MHz~1.2GHz
AthlonXP: 1500+(1.33GHz)~2800+(2.25GHz)
Chipset
The NVIDIA nForce™2 consists of the nVIDIA Crush18G and MCP2, HyperTransport with high speed of 6.4Gb/sec. NVIDIA
nForce™2 is excellent in providing amazing digital media performance, such as the new dual 400MHz DDR memory controller,
optimized 128-bit architecture reducing overall system memory latency. Integrated in this excellent chipset is the GeForce4 MX
Graphics, which could provide the fastest integrated graphics performance and the most comprehensive set of features. Of
three PCI slots provided, MK79G supports all three master PCI slots with arbitration and decoding for all integrated functions
and LPC bus.
Ultra DMA 66/100/133 Bus Master IDE
Embedded within nVIDIA MCP2, this motherboard equipped with Ultra DMA 66/100/133 that supports two connectors, and that
means four IDE devices in two channels, and supports Enhanced IDE devices.
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Expansion Slots
Including three 32-bit/33MHz PCI and one AGP 8X slots or DVO / TV-OUT function which supports DVO or TV-Out card. The
local bus throughput can be up to 132MB/s. The Accelerated Graphics Port (AGP) specification provides a new level of
PCI
video display sophistication and speed with data transfer rate up to 2.1GB/s. Or you may have ADD card cabled to this AGP slot,
Multiplexed Intel DVO output could provide high-speed digital connection for digital displays or TV-OUT functionality. MK79G
includes one AGP expansion slot for a bus mastering AGP graphic card, For AD and SBA signaling, MK79G can support
133MHz 2X/4X mode.
Memory
With NVIDIA nForce™2 chipsets, the MK79G can support Double-Data-Rate (DDR) RAM. The DDR RAM interface allows zero
wait state bursting between the SDRAM and the data buffers at 400/333/266 MHz. The four banks of DDR RAM can be
composed of an arbitrary mixture of 64, 128, 256, 512MB or 1GB DDR RAM and maximum up to 2GB. The MK79G allows DDR
RAM to run at either synchronous or pseudo-synchronous mode with the host CPU bus frequency (400/333/266MHz).
On-board AC97 Sound
MK79G uses the AC97 CODEC RealTek ALC650 chip. This on-board audio includes a complete audio recording and playback
system.
LAN Port
On the strength of RealTek RTL8201BL LAN controller on board, which is a highly-integrated Platform LAN Connect device, it
provides 10/100 Mbps Ethernet for office and home use.
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Six USB Connectors
Provides three ports, six USB connectors with transfer rates at high speed of 480Mbps for USB interface devices, such as
mouse, keyboard, modem, scanner, etc.
1MHz Stepping Frequency Adjustment
Provides “1MHz Stepping Frequency Adjustment” function in the BIOS. This magic function allows you adjust CPU FSB
frequency from 100~200 by 1MHz stepping, and lets your system can get maximum performance.
Watch Dog Timer
Includes AOpen “Watch Dog Timer” function that can auto-reset system in 4.8 seconds when you fail to system overclocking.
Power Management/Plug and Play
The MK79G supports the power management function that confirms to the power-saving standards of the U.S. Environmental
Protection Agency (EPA) Energy Star program. It also offers
problems, thus making the system much more user-friendly.
Plug-and-Play
, which helps saving users from configuration
Hardware Monitoring Management
Supports CPU or system fans status, temperature and voltage monitoring and alert, through the on-board hardware monitor
module and
Aopen Hardware Monitoring Utility
.
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Enhanced ACPI
Fully implement the ACPI standard for Windows® 95/98/ME/NT/2000/XP series compatibility, and supports Soft-Off, STR
(Suspend to RAM, S3), STD (Suspend to Disk, S4) features.
Super Multi-I/O
The MK79G provides one high-speed UART compatible serial port, one VGA port and one parallel port with EPP and ECP
capabilities.
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QQuuiicckk IInnssttaallllaattiioonn PPrroocceedduurree
This page gives you a quick procedure on how to install your system. Follow each step accordingly.
1. Installing CPU and Fan
2. Installing System Memory (DIMM)
3. Connecting Front Panel Cable
4. Connecting IDE and Floppy Cable
5. Connecting ATX Power Cable
6. Connecting Back Panel Cable
7. Power-on and Load BIOS Setup Default
8. Setting CPU Frequency
9.
Reboot
Installing Driver and Utility
10.
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Front Audio Connector
4Mb Phoenix Award BIOS
S/PDIF Connecto
Onboard AC97 CODEC
RealTek ALC650
-
IrDA Connecto
Green: AUX-IN Connecto
32-bit PCI Expansion Slot x3
CNR Expansion slot
IEEE1394 Connector x 2
JST-MIDI
COM2 Connector
STBY LED
SYSFAN3 C onnecto
Chassis Intrusion Sensor Connecto
JP14 CMOS Data Clear Jumpe
Front Panel Connector
2ndUSB2.0 Port Connecto
IDE Connector x 2
(ATA/66/100/133 supported)
Motherboard Map
PC99 Colored Back Panel
Resetable Fuse
RealTek RTL8201BL
CPUFAN1 Connector
JP28 USBKeyboard/Mouse Wakeup
JP27 USBKeyboard/Mouse Wakeup
TX Power Connector
SYSFAN2 Connector
TV OUT Connector
GP LED
JP21 K7 Host Clock selection
GP 8x Expansion Slot
(For 1.5V AGP card or ADD card)
462-pin CPU Socket with Voltage
and Frequency Auto-Detection that
supports AMD
and Athlon
Overheat Protection circuit to
thlonTMXP CPU only)
NVIDIA Crush18D and MCP2
184-pin DIMMx2 supports
DDR400/333/266
(Max. to 2GB)
FDD Connector
TM
AthlonTM/DuronTM/
TM
XP ( with CPU
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aannuuaall
BBlloocckk DDiiaaggrraamm
Socket 462
AMD
Athlon/Duro n/AthlonXP
CPU
AGP 8X Slot or ADD slot
VGA onboard
DDR SDRAM Socket x2
100/133/166MH z
System Bus
AGP Bus
LAN connect Component
DDR333/266/200
DDR RAM Up to 2GB
NVIDIA Crush18G
Floppy Disk Drive x2
PCI Bus
RealTek
RTL820 1BL
1stUSB Port
2ndUSB Port
2ndUSB Port
USB connector x6
32-bit PCI Slot x3
ATA
66/100/133
Primary
Channel
Secondary
Channel
MCP2
IDE Drive x4
AC’97 Link
Audio CODEC
Modem CODEC
4MBit Flash EEPROM
Parallel Port
Serial Port x1
IEEE 1394 x2
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HHaarrddwwaarree IInnssttaallllaattiioonn
This chapter describes jumpers, connectors and hardware devices of this motherboard.
Note: Electrostatic discharge (ESD) can damage your processor, disk drives, expansion boards,
and other components. Always observe the following precautions before you install a system
component.
1. Do not remove a component from its protective packaging until you are ready to install it.
2. Wear a wrist ground strap and attach it to a metal part of the system unit before handling a
component. If a wrist strap is not available, maintain contact with the system unit throughout
any procedures requiring ESD protection.
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You can clear CMOS to restore system default setting. To clear the CMOS, follow the procedures below.
1. Turn off the system and unplug the AC power.
2. Remove ATX power cable from connector PWR2.
3. Locate JP14 and short pins 2-3 for a few seconds.
4. Return JP14 to its normal setting by shorting pin 1 & pin 2.
5. Connect ATX power cable back to connector PWR2.
Pin 1
Normal Operation
1
(default)
1
Clear CMOS
Tip: When should I Clear CMOS?
1. Boot fail because of overclocking…
2. Forget password…
3. Troubleshooting…
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CCPPUU IInnssttaallllaattiioonn
This motherboard supports AMD® Athlon and Duron Socket 462 series CPU. Be careful of CPU orientation when you plug it into
CPU socket (with CPU Overheat Protection function implemented, the system will be automatically power off when the
temperature of CPU reached 97 degree, but works on AthlonXP CPU only).
1. Pull up the CPU socket lever and
up to 90-degree angle.
2. Locate Pin 1 in the socket and look for a black dot or cut edge on the
CPU upper interface. Match Pin 1 and cut edge, then insert the CPU into
the socket.
CPU socket
Lever
Note: This picture is for example only, it may not exactly be the same motherboard.
CPU pin 1
and cut edge
Black dot
and cut edge
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3. Press down the CPU socket lever and finish
CPU installation.
Note: This picture is for example only, it may not exactly be the same motherboard.
CPU cut edge
Note: If you do not match the CPU
socket Pin 1 and CPU cut edge well, it
ma
damage the CPU.
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AAOOppeenn OOvveerrhheeaatt PPrrootteeccttiioonn ((OO..HH..PP..)) TTeecchhnnoollooggyy
With AMD platform substantially keeps increasing the speed of its CPU, it inevitably led to the annoying problem of high CPU
operation temperature at the same time. In order to prevent accidental failure of CPU fan, which could cause the burning down
of the AthlonXP CPU, we, AOpen, have meticulously developed a new technology, named, O.H.P. (Overheat Protection)
Technology to protect them. Thanks to the intelligent monitoring design of AOpen O.H.P. technology, user can now finally set
their mind at ease even when fan failed to work without fearing the possible damage of CPU.
Under the circumstances that CPU fan is running properly, AthlonXP temperature should be way below the highest temperature
limit of 97℃. However, if CPU fan accidentally becomes
malfunction or improperly installed, the CPU temperature
would rocket abruptly, and you may find your system
hang up or crying over the smoking CPU if you haven’t
installed AOpen O.H.P. previously. With AOpen O.H.P.
technology applied, the specific thermal detection pins on
AthlonXP CPU would sense voltage difference when
processor is overheated with fan failed, and the overheat
protection system would immediately send out a signal to
abort your system by cutting CPU electricity before any
damage is done. Unlike other manufacturers who use
BIOS or software to control the power supply of CPU,
AOpen O.H.P. Technology is purely hardware-controlled
the minute after system boot-up, and occupies no system
resource. We are pleasant to phase in this practical
function on all AOpen AMD series motherboards to
protect customer’s valuable hardware and personal data.
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AMD
CPU
CPU voltage
Clock Generator
CPU Freq. Ratio
BIOS
Controlled
Circuit
CCPPUU JJuummppeerr--lleessss DDeessiiggnn
CPU VID signal and SMbus clock generator provide CPU voltage auto-detection and allows the user to set the CPU frequency
through the BIOS setup
designs are eliminated. There will be no worry of wrong CPU voltage detection.
, therefore no jumpers or switches are used. The disadvantages of the Pentium based jumper-less
Socket 462
CPU VID signal
Power Regulator
(Automatically generates CPU voltage)
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FFuullll--rraannggee AAddjjuussttaabbllee CCPPUU CCoorree VVoollttaaggee
This motherboard supports CPU VID function. The CPU core voltage will be automatically detected and the range is from 1.1V
to 1.85V. It is not necessary to set CPU Core Voltage.
SSeettttiinngg CCPPUU FFrreeqquueennccy
This motherboard is CPU jumper-less design, you can set CPU frequency through the BIOS setup, and no jumpers or switches
are needed.
BIOS Setup > Frequency/Voltage Control > CPU Speed Setting
CPU Ratio From 5.5x to 16x step 0.5x
CPU FSB (Adjustment
manually)
Home
FSB=100~200 by 1MHz Stepping CPU Overclocking
Warning: NVIDIA Crush18G chipset supports 166MHz FSB (with performance
reaches maximum 333MHz EV6 system bus) and 66MHz AGP clock, higher clock
setting may cause serious system damage.
y
Tip: If your system hangs or fails to boot because of overclocking, simply use <Home>
key to restore the default setting or you can wait the AOpen “Watch Dog Timer” reset
the system after five seconds and system will auto-detect hardware again.
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SSuuppppoorrtteedd CCPPUU FFrreeqquueennccyy
Core Frequency = CPU Bus Clock * CPU Ratio EV6 Bus Speed = CPU external bus clock x 2
PCI Clock = CPU Bus Clock / Clock Ratio AGP Clock = PCI Clock x 2
CPU CPU Core Frequency EV6 Bus Clock Ratio
Athlon 1G 1GHz 200MHz 10.0x
Athlon 1.1G 1.1GHz 200MHz 11.0x
Athlon 1.2G 1.2GHz 200MHz 12.0x
Athlon 1.3G 1.3GHz 200MHz 13.0x
Athlon 1G 1GHz 266MHz 7.5x
Athlon 1.13G 1.13GHz 266MHz 8.5x
Athlon 1.2G 1.2GHz 266MHz 9.0x
Athlon 1.33G 1.33GHz 266MHz 10.0x
Athlon 1.4G 1.4GHz 266MHz 10.5x
AthlonXP 1500+ 1.3GHz 266MHz 10.0x
AthlonXP 1600+ 1.4GHz 266MHz 10.5x
AthlonXP 1700+ 1.46GHz 266MHz 11.0x
AthlonXP 1800+ 1.53GHz 266MHz 11.5x
AthlonXP 1900+ 1.6GHz 266MHz 12.0x
AthlonXP 2000+ 1.667GHz 266MHz 12.5x
AthlonXP 2100+ 1.73GHz 266MHz 13x
AthlonXP 2200+ 1.80GHz 266MHz 13.5x
AthlonXP 2400+ 2.0GHz 266MHz 15x
AthlonXP 2600+ 2.13GHz 266MHz 16x
AthlonXP 2700+ 2.16GHz 333MHz 13x
AthlonXP 2800+ 2.25GHz 333MHz 13.5x
Duron 800 800MHz 200MHz 8.0x
Duron 850 850MHz 200MHz 8.5x
Duron 900 900MHz 200MHz 9.0x
Duron 950 950MHz 200MHz 9.5x
Duron 1G 1GHz 200MHz 10.0x
Duron 1.1G 1.1GHz 200MHz 11.0x
Note: With CPU speed changing rapidly, there might be fastest CPU on
the market by the time you received this installation guide. This table is
kindly for your references only.
Note: This motherboard support
CPU auto-detection function.
Hence, you don’t need to setup
the CPU frequency manually.
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JJPP2211 KK77 HHoosstt CClloocckk SSeelleeccttiioonn
This jumper allows you to select your host CPU frequency. For 133/166MHz FSB, please set the pin to 1-2; and for 100MHz
FSB, please set it to pin 2-3. Generally speaking, if you are not overclockers, we recommend you to set it to the default setting.
Additionally, this motherboard also provides “1MHz Stepping Adjustment” feature for overclockers to adjust CPU FSB
frequency via BIOS setup program. The adjustment range is 100~200MHz. If you fix the CPU FSB frequency by JP21, the
“1MHz Stepping Adjustment” range will be changed and following the JP21 setting.
Pin 1
JP17 Host Clock
Select Jumper
1
133/166MHz
Default
100MHz
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AAOOppeenn ““WWaattcchh DDoogg TTiimmeerr””
With this motherboard, AOpen provides a very special, useful feature for overclockers. When you
power-on the system, the BIOS will check last system POST
enable “Watch Dog Timer” function immediately, and set the CPU FSB
that stored in the BIOS. If system failed in BIOS POST, the “Watch Dog Timer” will reset the
system to reboot in five seconds. Then, BIOS will detect the CPU’s default frequency and POST
again. With this special feature, you can easily overclock your system to get higher system performance without removing the
cover of system housing, and be able to set the jumper to clear CMOS data when your system hanged.
AOpen
Watch Dog
Timer
Enable/Disable Signal
from BIOS
Countdown about
5 seconds if fails
in POST
Reset Signal
Clock Generator
status. If it succeeded, the BIOS will
frequency by user’s setting
BIOS
CPU ID Signal
CPU
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CCPPUU aanndd HHoouussiinngg FFaann CCoonnnneeccttoorr
Plug in the CPU fan cable to the 3-pin CPUFAN1 connector. If you have chassis fan, you can also plug it on SYSFAN2 or
SYSFAN3 connector.
CPUFAN1 Connector
GND
+12V
SENSOR
GND
+12V
SENSOR
SYSFAN2 Connector
GND
+12V
SENSOR
SYSFAN3 Connector
Note: Some CPU fans do not have
sensor pin, so that cannot support fan
monitoring.
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Enable
st
USB
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This motherboard provides USB and PS2 keyboard / mouse wake-up function. You can use JP27 / JP28 to enable or disable
this function, which could resume your system from suspend mode with keyboard or mouse installed. JP28 controls 1
channel, and JP27 controls 2
function by setting the jumper to 2-3.
2nd USB Channel
1
Pin 1
Disable
(Default)
Enable
nd
USB channel. The factory default setting is set to “Disable”(1-2), and you may enable this
st
1
USB Channel
JP28
1
Disable
(Default)
29
M
M
9
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This motherboard has three 184-pin DDR DIMM sockets that allow you to install DDR400 or DDR333 or DDR266 memory up to
2 GB. Only Non-ECC DDR RAM are supported, otherwise, it will cause serious damage on memory sockets or SDRAM module.
Warning: This motherboard supports DDR
RAM, please do not install the SDRAM on
the DDR RAM sockets. Otherwise, it will
cause serious damage on memory sockets
or SDRAM module.
DDR
RAM
30
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