F e a t u r e Hi g h l i g h t
Supports Intel Socket 478 Pentium 4 800MHz~2.0GHz+ with 400MHz system bus designed for Socket 478 technology.

Chipset

The Intel- 850 chipset consists of three main components: Memory Control Hub (MCH), I/O Control Hub 2 (ICH2X) and Firmware Hub (FWH). All these components are interconnected via an Intel proprietary interface called hub interface. The hub interface designed into the Intel 850 chipset to provide efficient communication between components. Additional hardware platform features include AGP 4x mode, Direct RDRAM, Ultra ATA/100, Low Pin Count (LPC) interface, integrated LAN and Universal Serial Bus (USB). The platform is also ACPI compliant and supports Full-on, Stop Grant, Suspend to RAM, Suspend to Disk and Soft-off power management states. Through the use of an appropriate LAN connect, the platform supports Wake-on-LAN for remote administration and troubleshooting.

Expansion Slots

Including five 32-bit/33MHz PCI, one CNR and one AGP Pro slots. The PCI local bus throughput can be up to 132MB/s. The Communication & Nectworking Riser (CNR) slot provided from AX4T II can support CNR interface for a LAN/Modem/Audio card. The Accelerated Graphics Port (AGP) specification provides a new level of video display sophistication and speed. The AGP video cards support data transfer rate up to 1066MB/s. As AX4T II motherboard includes one AGP Pro expansion slot for a bus mastering AGP graphic card, for AD and SBA signaling, AX4T II can support AGP 4X mode.

Memory

Provides four 168-pin DRDRAM DIMM socket that support up to 2GB of PC-600/800 compliant DRDRAM (Direct Rambus DRAM). You may install 64, 128, 256 or 512MB with ECC (Error Checking and Correction) RDRAM RIMM modules into each socket.
Ultra DMA 33/66/100 Bus Mater IDE
Comes with an on-board PCI Bus Master IDE controller with two connectors that supports four IDE devices in two channels, supports Ultra DMA 33/66/100, PIO Modes 3 and 4 and Bus Master IDE DMA Mode 4, and supports Enhanced IDE devices.

On-board AC97 Sound

AX4T II uses AC97 sound chip. This on-board audio includes a complete audio recording and playback system.

Four USB Connectors

AX4T II provides two ports, four USB connectors for USB interface devices such as mouse, keyboard, modem, scanner, etc.
Power Management/Plug and Play
AX4T II 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 Plug-and-Play, which helps save users from configuration problems, thus making system user-friendlier.
Hardware Monitoring Management

Supports CPU or system fans status, temperature and voltage monitoring and alert, through the on-board hardware monitor module.

Enhanced ACPI

Fully implement the ACPI standard for Windows 98/ME/2000 series compatibility, and supports Soft-Off, STR (Suspend to RAM, S3), STD (Suspend to Disk, S4), WOM (Wake On Modem), WOL (Wake On LAN) features.

Super Multi-I/O

AX4T II provides two high-speed UART compatible serial ports and one parallel port with EPP and ECP capabilities. UART2 can also be directed from COM2 to the Infrared Module for the wireless connections.
Q ui c k I n s t a l l a t i o n P r o c e d ur e
This page gives you a quick procedure on how to install your system. Follow each step accordingly.
1. 2. 3. 4. 5. 6. 7. 8. 9.
Installing CPU and Fan Installing System Memory (DIMM Connecting Front Panel Cable Connecting IDE and Floppy Cable Connecting ATX Power Cable Connecting Back Panel Cable Power-on and Load BIOS Setup Default Setting CPU Frequency Reboot
10. Installing Operating System (such as Windows 98) 11. Installing Driver and Utility
MODEM-CN Connector Front Audio Connector CD-IN Connector

Motherboard Map

PC99 Colored Back Panel with 10/100Mbps Ethernet RJ45 Connector(Optional) Resettale Fuse 4-pin 12V ATX Power Connector CPU Fan Connector
4Mbit Flash ROM BIOS IrDA Connector CNR Expansion Slot
32-bit PCI Expansion Slot x5 AGP Pro Expansion Slot
478-pin CPU socket with Voltage and Frequency Auto-detection that supports Intel Pentium 4 1.30~1.50GHz+ CPU Low ESR Capacitors
Front Panel Connector AGP Pro External Power Connector JP7 Raid Select Jumper (Optional) ATA/100 IDE RAID Connector x2 (Optional) FDD Connector JP14 CMOS Clear Jumper Supports 2nd USB Connector FAN2 Connector Chassis Intrusion Detector 15
184-pin RIMM Socket x4 supports PC-600/800 RDRAM maximum up to 2GB
Intel 850 chipset with MCH, ICH2X and FWH that supports LAN, Ultra ATA/100, RDRAM Solution FAN3 Connector ATX Power Connector ATA33/66/100 IDE Connector x2

Bl o c k D i a g r a m

PC-600/800 Direct RDRAM Up to 2GB

RIMM Socket x2

Dual Channel RDRAM data transferring rate up to 3.2GB/s 32-bit PCI Slot x5 PCI Bus data transferring rate up to 133MB/s Primary Channel Secondary Channel ATA 33/66100

400MHz System Bus

IDE Drive x4

AC97 CODEC

Audio CODEC

This motherboard supports Intel Pentium 4 1.30~1.50GHz+ Socket 478 series CPU. Please follow the step as below to finish CPU installation. Be careful of CPU orientation when you plug it into CPU socket. 1. Pull up the CPU socket level 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

CPU pin 1 and cut edge CPU cut edge
Note: These pictures are for example only; they may not exactly be the same as the motherboard you purchased.
3. Press down the CPU socket level and finish CPU installation.

CPU cut edge

Note: If you do not match the CPU socket Pin 1 and CPU cut edge well, it may damage the CPU.
Note: This socket supports Micro-FC-PGA2 package CPU, which is the latest CPU package developed by Intel. Other forms of CPU package cannot be fitted in.
Note: The CPU you purchase may look different from the one shown here.
C P U J u m p er - l e s s D e si g n
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, therefore no jumpers or switches are used. The disadvantages of the Pentium based jumper-less designs are eliminated. There will be no worry of wrong CPU voltage detection.
Intel Socket 478 series Pentium 4 CPU

Clock Generator

BIOS Controlled
CPU Freq. Ratio CPU VID signal CPU voltage Power Regulator (Automatically generates CPU voltage)

Circuit

S e t t i n g C P U Fr e q u e n c y
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 Clock Ratio

CPU Ratio CPU FSB

8x, 9x, 10x, 11x, , 22x, 23x 100-180MHz by 1MHz stepping

Warning:

Intel 850 chipset supports maximum
400MHz (100MHz*4) system bus and 66MHz AGP clock, higher clock setting may cause serious system damage.
Tip: If your system hangs or fails to boot because of overclocking, simply use <Home> key to restore the default setting.
S upport e d CP U Fre que nc y
Core Frequency = CPU Bus Clock * 4 * CPU Ratio PCI Clock = CPU Bus Clock / Clock Ratio AGP Clock = PCI Clock x 2

Note: This motherboard support CPU auto-detection function. Hence, you dont need to setup the CPU frequency by manual.
CPU Pentium 4 1.3G Pentium 4 1.4G Pentium 4 1.5G Pentium 4 1.6G Pentium 4 1.7G Pentium 4 1.8G Pentium 4 1.9G Pentium 4 2.0G Pentium 4 2.2G Pentium 4 2.3G
CPU Core Frequency 1.3GHz 1.4GHz 1.5GHz 1.6GHz 1.7GHz 1.8GHz 1.9GHz 2.0GHz 2.2GHz 2.3GHz
FSB Clock 100MHz 100MHz 100MHz 100MHz 100MHz 100MHz 100MHz 100MHz 100MHz 100MHz
Ratio 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x
Intel 850 chipset supports maximum 400MHz (100MHz*4)
system bus and 66MHz AGP clock, higher clock setting may cause serious system damage.
C P U a n d H o u s i n g F a n C o n n e c t o r ( w i t h H/ W M o ni t o r i n g )
Plug in the CPU fan cable to the 3-pin CPU FAN connector. If you have chassis fan, you can also plug it on FAN2 or FAN3 (without H/W monitoring) connector.

CPU Fan Connector

GND +12V SENSOR
FAN3 Connector NC +12V Note: Some CPU fans do not have sensor pin, so that cannot support hardware monitoring function. GND

FAN2 Connector 25

H o w t o I ns t a l l CP U H e a t s i n k a n d F a n
This motherboard comes with a retention module attached on the CPU socket when shipped, we strongly recommend you to install AOpen special designed CPU Fan as shown below on the retention module for better heat dissipation. Please install the CPU Fan correctly as the following pictures shown. 1. Gently put the CPU Fan down on the retention module with clips aligning correctly to the four corners. 2. Pressing down the four clips with force one by one on the retention module.
Note: The picture above may look different from the product you purchased.

RI M M S o c k e t s

This motherboard has four 184-pin RIMM sockets that allow you to install PC600 and PC800 RDRAM up to 2GB. AX4T II will detect the RDRAM speed automatically while system is in POST, but it still allows you to select the RDRAM type manually by BIOS setup program. Note: Based on Intel 850 chipset specification, AX4T II has dual memory channel. Please note that when you insert RIMM modules, you have to insert them into RIMM 1 and 4, and have terminators inserted into RIMM 2 and 3. Or you can insert RIMM modules into RIMM 2 and 3, and have terminators inserted into RIMM 1 and 4

RIMM3 RIMM4

Pictures below are Direct RDRAM memory module and RIMM terminator (also called C-RIMM). Please do not forget to insert the RIMM terminator into the proper RIMM socket, otherwise the system cannot be booted.

DRDRAM RIMM Module

RIMM Terminator
H o w t o I ns t a l l Me m o r y M o d u l e s
Please follow the procedure as shown below to finish memory installation.
Make sure the RIMM modules pin face down and match the sockets size as depicted below.

60 pins 2.

88 pins
Insert the module straight down to the RIMM slot with both hands and press down firmly until the RIMM module is securely in place.
Note: The tabs of the RIMM slot Tab will close-up to hold the RIMM in place when the RIMM touches the slots bottom.
3. Repeat step 2 to finish additional RIMM & C-RIMM modules installation.

Direct RDRAM Module

C-RIMM Module
Note: Please do not forget to install the C-RIMM modules into the proper RIMM slots.
Note: Pictures shown here are for reference only.
Fr o n t P a n e l C o n n e c t o r
Attach the power LED, EMPI, speaker, power and reset switch connectors to the corresponding pins. If you enable Suspend Mode item in BIOS Setup, the ACPI & Power LED will keep flashing while the system is in suspend mode. Locate the power switch cable from your ATX housing. It is 2-pin female connector from the housing front panel. Plug this connector to the soft-power switch connector marked SPWR. Suspend Type Power on Suspend (S1) or Suspend to RAM (S3) Suspend to Disk (S4) ACPI LED Keep flashing The LED will be turned off

1 Power Switch

NC NC +5V IDE LED IDE LED +5V +5V GND NC SPEAKER SPWR GND ACPI & PWR LED GND +5V NC NC GND RESET GND

IDE LED

ACPI & Power LED

+ Speaker Reset

ATX Power Connector
This motherboard comes with a 20-pin and 4-pin ATX power connector as shown below. Make sure you plug in the right direction. We strongly recommend you to connect the 4-pin 12V ATX connector before connecting the 20-pin ATX power connector and use standard power supply specially designed for Pentium 4 system.

JP 7 R a i d Se l e c t J u m p er (O p t i o n al )
This jumper allows you to select the Raid function by adjusting the position of its yellow cap.
JP7 Enable/Disable Raid Jumper

Other IDE

I r DA C o n n e c t o r
The IrDA connector can be configured to support wireless infrared module, with this module and application software such as Laplink or Windows 95 Direct Cable Connection, the user can transfer files to or from laptops, notebooks, PDA devices and printers. This connector supports HPSIR (115.2Kbps, 2 meters) and ASK-IR (56Kbps). Install the infrared module onto the IrDA connector and enable the infrared function from BIOS Setup, UART2 Mode, make sure to have the correct orientation when you plug in the IrDA connector.

IrDA Connector

1 NC +5V IR_TX KEY GND IR_RX
A G P ( A c c e l e r a t e d G r a p hi c P o r t ) P r o E x p a n s i o n S l o t
AX4T II provides an AGP Pro slot. The AGP Pro is a bus interface targeted for high-performance 3D graphic. Recently, there are more memory modules on the AGP card. Hence, the AGP card needs more power to drive these chips. The AGP Pro interface has more power pins to provide more power for the card. AGP supports only memory read/write operation and single-master single-slave one-to-one only. AGP Pro now supports AGP 4x mode, 66MHz x 4bytes x 4 = 1056MB/s. There is an external power connector called CN12 for AGP card. You can connect it with proper cable to get steady power for AGP Pro display card.

+12V GND GND VCC

AGP Pro Expansion Slot
C N R ( C o m m u ni c a t i o n a n d N e t w or k Ri s e r ) E x pa n s i o n S l o t
CNR is a riser card specification to replace the AMR (Audio/Modem Riser) that supports V.90 analog modem, multi-channel audio, and phone-line based networking. Owing to CPU computing power getting stronger, the digital processing job can be implemented in main chipset and share CPU power. The analogy conversion (CODEC) circuit requires a different and separate circuit design, which is put on CNR card. This motherboard implements sound CODEC on board (can be disabled by BIOS setup program), but reserve CNR slot for the option of modem function. Note that you can still use PCI modem card.

Fan Speed

CPU Temperature CPU Voltage

Detection Circuit

AOpen H/W Monitoring Utility

System Voltage

R e se t ta b l e F u s e
Traditional motherboard has fuse for Keyboard and USB port to prevent over-current or shortage. These fuses are soldered onboard that when it is broken (did the job to protect motherboard), user still cannot replace it and the motherboard is still malfunction. With expensive Resettable Fuse, the motherboard can back to normal function after fuse did the protection job.

Resettable Fuse

L o w E S R C a p a c i t or
A group of large capacitors that meet the requirements of todays high performance motherboard design. The theory behind this is long transmission lines have considerable inductance and capacitance as well as resistance. When a current flows through the line, inductance and capacitance have the effect of varying the voltage on the line as the current varies. Thus the supply voltage varies with the load. Several kinds of devices are used to overcome this undesirable variation, in an operation called regulation of the voltage. They include induction regulators and three-phase synchronous motors (called synchronous condensers), both of which vary the effective amount of inductance and capacitance in the transmission circuit. Inductance and capacitance react with a tendency to nullify one another. When a load circuit has more inductive than capacitive reactance, as almost invariably occurs in large power systems, the amount of power delivered for a given voltage and current is less than when the two are equal. The ratio of these two amounts of power is called the power factor. Because transmission-line losses are proportional to current, capacitance is added to the circuit when possible, thus bringing the power factor as nearly as possible to 1. For this reason, large capacitors are frequently inserted as a part of power-transmission systems.
The power circuit of the CPU core voltage must be checked to ensure system stability for high speed CPUs (such as the new Pentium III, or when overclocking). A typical CPU core voltage is 2.0V, so a good design should control voltage between 1.860V and 2.140V. That is, the transient must be below 280mV. Below is a timing diagram captured by a Digital Storage Scope, it shows the voltage transient is only 143mv even when maximum 18A current is applied.
Note: This diagram is for example only, it may not be exactly the same as this motherboard.
Layout (Frequency Isolation Wall)
For high frequency operation, especially overclocking, layout is the most important factor to make sure chipset and CPU working in stable condition. The layout of this motherboard implements AOpens unique design called Frequency Isolation Wall. Separating each critical portion of motherboard into regions where each region operates in a same or similar frequency range to avoid cross talk and frequency interference between each regions operations and condition. The trace length and route must be calculated carefully. For example, the clock trace must be equal length (not necessarily as short as possible) so that clock skew will be controlled within few a pico second (1/1012 Sec)

10. Insert the AOpen Bonus Pack CD into the CD-ROM. 11. Press the Next button. A message informing you that system has found Intel (R) PRO/100 VE Network Connection should appear. 12. Press the Next, and then Finish, and then Yes when asked if you want to restart your computer.
I n s t a l l i n g O n b o a r d S o u n d Dr i v e r
This motherboard comes with an RealTek ALC201 chip. You can find the audio driver from the Bonus Pack CD disc auto-run menu.
I n s t a l l i n g H a r d w a r e M o n i t or i n g U t i l i t y
You can install Hardware Monitoring Utility to monitor CPU temperature, fans and system voltage. The hardware monitoring function is automatically implemented by the BIOS and utility software. No hardware installation is needed. To install the software, double click Setup.exe. The driver will be copied into Windows directory and an entry of Hardware Monitor in the start menu will be created.
A C P I S u s p e n d t o H a r d Dr i v e
ACPI Suspend to Hard Drive is basically controlled by Windows operation system. It saves your current work (system status, memory and screen image) into hard disk, and then the system can be totally power off. Next time, when power is on, you can resume your original work directly from hard disk within few seconds without go through the Windows booting process and run your application again. If your memory is 64MB, normally, you need to reserve at least 64MB HDD space to save your memory image.
When go into Suspend: System Image & Status

Save into

Hard Disk
When power-on next time: System Image & Status

Restore within seconds

System Requirement
1. 2. AOZVHDD.EXE 1.30b or later. Delete config.sys and autoexec.bat.
Fresh installation of Windows 98 on a new system
1. Execute "Setup.exe /p j" to install Windows 98 2. After Windows 98's installation is complete, go to the Control Panel > Power Management. a. Set Power Schemes > System Standby to "Never". b. Click on "Hibernate" and select "Enable Hibernate Support" then "Apply". c. Click on the "Advanced" tab, you'll see "Hibernate" on "Power Buttons". Note that this option will only be seen after step b mentioned above has been completed; otherwise only "Standby" and "Shutdown" will be shown. Select "Hibernate" and "Apply". 3. Clean boot into DOS and run AOZVHDD utility. a. If you assign the whole disk to your Win 98 system (FAT 16 or FAT 32), please run "aozvhdd /c /file". Please remember sufficient free space has to be reserved in the disk, e.g. if you have 64 MB DRAM and 16 MB VGA card installed, the system needs at least 80 MB free space. The utility will locate the space automatically. b. If you assign an individual partition for Win 98, please run "aozvhdd /c /partition". Of course, the system needs to provide unformatted an empty partition. 4. Reboot system. 5. You've already implemented ACPI Suspend to-Hard Drive. Click "Start > Shut Down > Standby" then the screen will go off immediately. And 1 minute or so will be taken for the system to save what's in the memory to the hard drive; the larger the memory size the longer this process will take.

Changing from APM to ACPI (Windows 98 only)
1. Run "Regedit.exe" a. Go through the following path HKEY_LOCAL_MACHINE SOFTWARE MICROSOFT WINDOWS CURRENT VERSION DETECT b. Select "ADD Binary" and name it as "ACPIOPTION". c. Right click and select Modify, add "01" after "0000" to make it "0000 01". d. Save changes.
2. Select "Add New Hardware" under Control Panel. Allow Windows 98 to detect new hardware. (It will find "ACPI BIOS" and remove "Plug and Play BIOS") 3. Reboot system. 4. Clean boot into DOS and run "AOZVHDD.EXE /C /File"
Changing from ACPI to APM
1. Run "Regedit.exe"
a. Go through the following path HKEY_LOCAL_MACHINE SOFTWARE MICROSOFT WINDOWS CURRENT VERSION DETECT ACPI OPTION b. Right click and select "Modify, change "01" to "02" to make it "0000 02".
Tip: "02" means Windows 98 is ACPI acknowledged but the ACPI function is disabled. c. Save changes. 2. Select "Add New Hardware" under Control Panel. Allow Windows 98 to detect new hardware. (It will find "Plug and Play BIOS" and remove "ACPI BIOS") 3. Reboot system. 4. Run "Add New Hardware" again and it will find "Advanced Power Management Resource". 5. Click "OK". Tip: Currently we found only ATI 3D Rage Pro AGP card would support ACPI suspend to disk. Please refer to AOpen web site for latest update
A C PI S u s p e n d t o R A M ( S T R )
This motherboard supports ACPI Suspend to RAM function. With this function, you can resume your original work directly from DRAM without going through the Windows 98 booting process and run your application again. Suspend to DRAM saves your current work in the system memory, it is faster than Suspend to Hard Drive but requires power supplied to DRAM, while Suspend to Hard Drive requires no power.

When go into Suspend:

System Image & Status in the DRAM Backup by 3.3V Power
Other System Devices Power loss

When power-on next time:

System Image & Status in the DRAM Power back to work

Other System Devices

Power back to work
To implement ACPI Suspend to DRAM, please follow the procedures as below:
1. 2. An ACPI OS is required. Currently, Windows 98 is the only choice. The VIA 4 in 1 Driver must have been installed properly.

Procedures

1. Changed the following BIOS settings. BIOS Setup > Power Management Setup > ACPI Function: Enabled BIOS Setup > Power Management Setup > ACPI Suspend Type: S3.
Go to Control Panel > Power Management. Set Power Buttons to Standby. Press power button or standby button to wake up the system.

A W AR D B I O S

System parameters can be modified by going into BIOS Setup menu, this menu allows you to configure the system parameters and save the configuration into the 128 bytes CMOS area, (normally in the RTC chip or in the main chipset). The AwardBIOS that installed in the Flash ROM of the motherboard is a custom version of an industry standard BIOS. The BIOS provides critical low-level support for standard devices such as hard disk drives, serial and parallel ports. Most BIOS setting of AX4T II had optimized by AOpens R&D engineering team. But, the default setting of BIOS still cant fine-tune the chipset controlling entire system. Hence, the rest of this chapter is intended to guide you through the process of configuring your system using setup. To enter to BIOS setup menu, press <Del> when POST (Power-On Self Test) screen is shown on your monitor.

Note: Because the BIOS code is the most often changed part of the motherboard design, the BIOS information contained in this manual may be different with actual BIOS that come with your motherboard.
A b o u t BI O S F u n c t i o n De s c r i p t i o n
AOpen always dedicates to give users a more friendly computer system. Now, we include all function descriptions of BIOS setup program into the BIOS Flash ROM. When you select one function of BIOS setup program, the function description will appeared at right side of screen. Hence, you dont need read this manual while you changing the BIOS setting.

Menu Items Select Window

Item Function Description Window
How To Use Award BIOS Setup Program
Generally, you can use the arrow keys to highlight items that you want to choose, then press <Enter> key to select, and use the <Page Up> and <Page Down> key to change setting value. You also can press <F1> key for help and press <Esc> key to quit Award BIOS setup program. The following table provides details about how to use keyboard in the Award BIOS setup program. By the way, all products of AOpen also provides a special function in the BIOS setup, you can press <F3> key selecting preferred menu language to display. Key Page Up or + Page Down or Enter Esc Description Changing setting to next value or increase the value. Changing setting to previous value or decrease value. Select the item. 1. 2. Up Arrow Down Arrow Left Arrow Right Arrow F1 F3 F5 In main menu: Quit and dont save any change. In sub menu: Exit current menu to main menu.
Highlight previous item. Highlight next item. Move the light bar to left side of menu. Move the light bar to right side of menu. Get menu or item help description. Changing menu language. Load previous setting value from CMOS.

Key F6 F7 F10

Description Load fail-save setting value from CMOS. Load turbo setting value from CMOS. Save changed setting and exit setup program.
Note: AOpen always dedicates to give users a more friendly computer system. Now, we include all function descriptions of BIOS setup program into the BIOS Flash ROM. When you select one function of BIOS setup program, the function description will appeared at right side of screen. Hence, you dont need read this manual while you change the BIOS setting.

How To Enter BIOS Setup

After you finish the setting of jumpers and connect correct cables. Power on and enter the BIOS Setup, press <Del> during POST (Power-On Self Test). Choose "Load Setup Defaults" for recommended optimal performance.
Warning: Please avoid of using "Load Turbo Defaults", unless you are sure your system components (CPU, DRAM, HDD, etc.) are good enough for turbo setting. 72

The EDO DRAM technology is actually very similar to FPM (Fast Page Mode). Unlike traditional FPM that tri-states the memory output data to start the pre-charge activity, EDO DRAM holds the memory data valid until the next memory access cycle, that is similar to pipeline effect and reduces one clock state.
E E P RO M ( E l e c tr o n i c E r a s a b l e P r o g r a m m a b l e R O M )
Also known as E 2PROM. Both EEPROM and Flash ROM can be re-programmed by electronic signals, but the interface technology is different. Size of EEPROM is much smaller than flash ROM.
E P R O M (E r a s a bl e P r o g r a m m a b l e R O M )
Traditional motherboard stores BIOS code in EPROM. EPROM can only be erased by ultra-violet (UV) light. If BIOS has to be upgraded, you need to remove EPROM from motherboard, clear by UV light, re-program, and then insert back.

EV 6 B u s

EV6 Bus in the technology of Alpha processor from Digital Equipment Corporation. EV6 bus uses both rising and falling clock edge to transfer data, similar as DDR SDRAM or ATA/66 IDE bus. EV6 Bus Speed = CPU external bus clock x 2. For example, 200 MHz EV6 bus is actually using 100 MHz external bus clock, but the equivalent speed is 200 MHz.
F C C D o C ( De c l a r a t i o n o f C o n f o r m i ty )
The DoC is component certification standard of FCC EMI regulations. This standard allows DIY component (such as motherboard) to apply DoC label separately without a shielding of housing.
F C - P G A ( F l i p C hi p - P i n G ri d A r ra y )
FC means Flip Chip, FC-PGA is a new package of Intel for Pentium III CPU. It can plug into SKT370 socket, but require motherboard to add some signals on socket 370. That is, the motherboard needs to be redesigned. Intel is going to ship FC-PGA 370 CPU and phase out slot1 CPU.

F la s h R O M

Flash ROM can be re-programmed by electronic signals. It is easier for BIOS to upgrade by a flash utility, but it is also easier to be infected by virus. Because of increase of new functions, BIOS size is increased from 64KB to 256KB (2M bit). AOpen AX5T is the first board to implement 256KB (2Mbit) Flash ROM. Now flash ROM size is moving to 4M bit on AX6C (Intel 820) and MX3W (Intel 810) motherboard. , AOpen motherboard uses EEPROM for jumper-less and battery-less design.
F S B ( F r o n t S i d e B u s ) C l oc k
FSB Clock means CPU external bus clock. CPU internal clock = CPU FSB Clock x CPU Clock Ratio

I2C Bus

See SMBus.

IE EE 4

IEEE 1394 is a low-cost digital interface originated by Apple Computer as a desktop LAN and developed by the IEEE 1394 working group. The IEEE 1394 can transport data at 100, 200 or 400 Mbps. One of the solutions to connect digital television devices together at 200 Mbps. Serial Bus Management provides overall configuration control of the serial bus in the form of optimizing arbitration timing, guarantee of adequate electrical power for all devices on the bus, assignment of isochronous channel ID, and notification of errors. There are two type of IEEE 1394 data transfer: asynchronous and isochronous. Asynchronous transport is the traditional computer memory-mapped, load and store interface. Data requests are sent to a specific address and an acknowledgment is returned. In addition to an architecture that scales with silicon technology, IEEE 1394 features a unique isochronous data channel interface. Isochronous data channels provide guaranteed data transport at a pre-determined rate. This is especially important for time-critical multimedia data where just-in-time delivery eliminates the need for costly buffering.

P a r i t y Bi t

The parity mode uses 1 parity bit for each byte, normally it is even parity mode, that is, each time the memory data is updated, parity bit will be adjusted to have even count "1" for each byte. When next time, if memory is read with odd number of "1", the parity error is occurred and this is called single bit error detection.
P BS R A M ( P i p e l i n e d B u r s t S R A M )
For Socket 7 CPU, one burst data read requires four QWord (Quad-word, 4x16 = 64 bits). PBSRAM only needs one address decoding time and automatically sends the remaining QWords to CPU according to a predefined sequence. Normally, it is 3-1-1-1, total 6 clocks, which is faster than asynchronous SRAM. PBSRAM is often used on L2 (level 2) cache of Socket 7 CPU. Slot 1 and Socket 370 CPU do not need PBSRAM.

P C -0 D I M M

SDRAM DIMM that supports 100MHz CPU FSB bus clock.

P C -3 D I M M

SDRAM DIMM that supports 133MHz CPU FSB bus clock.
P C -o r P C - D D R D R A M
Based on FSB frequency, the DDR DRAM has 200MHz and 266MHz two type of working frequency. Because of DDR DRAM data bus is 64-bit, it provides data transfer bandwidth up to 200x64/8=1600MB/s, and 266x64/8=2100MB/s. Hence, the PC-1600 DDR DRAM is working with 100MHz and PC-2100 DDR DRAM is working with 133MHz FSB frequency.
P CI ( P e r i ph e r a l C o m p o ne n t I n te r f a c e ) B u s
Bus for the internal connection of peripheral devices, high-speed data channel between the computer and expansion card.

P D F F o r ma t

A file format for electronic document, PDF format is independent from platform, you can read PDF file under Windows, Unix, Linux, Mac with different PDF reader. You can also read PDF file by web browser such as IE and Netscape, note that you need to install PDF plug-in first (Included in Acrobat Reader).
P nP ( P l u g a n d P l a y )
The PnP specification suggests a standard register interface for both BIOS and operating system (such as Windows 95). These registers are used by BIOS and operating system to configure system resource and prevent any conflicts. PnP BIOS or operating system will automatically allocate the IRQ/DMA/Memory. Currently, almost all the PCI cards and most ISA cards are already PnP compliant.
POST (Power-On Self Test)
The BIOS self-test procedure after power-on, sometimes, it is the first or the second screen shown on your monitor during system boot.
R D R A M ( R a mb u s D R A M )
Rambus is a memory technology that uses large burst mode data transfer. Theoretically, the data transfer should be high than SDRAM. RDRAM is cascaded in channel operation. For Intel 820, only one RDRAM channel is supported, 16-bit data per channel, and this channel may have maximum 32 RDRAM devices, no matter how many RIMM sockets.

Turn off the system and re-connect IDE cable.
Check if the system can reboot successfully? Yes
The problem should be caused by the IDE cable or HDD itself.
Re-install the operating system such as Windows 98.
T e ch n ic a l Su p p o r t
Dear Customer, Thanks for choosing AOpen products. To provide the best and fastest service to our customer is our first priority. However, we receive numerous emails and phone-calls worldwide everyday, it is very hard for us to serve everyone on time. We recommend you follow the procedures below and seek help before contact us. With your help, we can then continue to provide the best quality service to more customers. Thanks very much for your understanding! AOpen Technical Supporting Team
Online Manual: Please check the manual carefully and make sure the jumper settings and installation procedure are correct. http://www.aopen.com.tw/tech/download/manual/default.htm Test Report: We recommend choosing board/card/device from the compatibility test reports for assembling your PC. http://www.aopen.com.tw/tech/report/default.htm
FAQ: The latest FAQ (Frequently Asked Questions) may contain a solution to your problem. http://www.aopen.com.tw/tech/faq/default.htm
Download Software: Check out this table to get the latest updated BIOS/utility and drivers. http://www.aopen.com.tw/tech/download/default.htm 94
News Group: Your problem probably had been answered by our support engineer or professional users on the news group. http://www.aopen.com.tw/tech/newsgrp/default.htm Contact Distributors/Resellers: We sell our products through resellers and integrators. They should know your system configuration very well and should be able to solve your problem more efficiently than us. After all, their attitude of service is an important reference for you if next time you want to buy something else from them. Contact Us: Please prepare detail system configuration and error symptom before contacting us. The part number, serial number and BIOS version are also very helpful.
Part Nu m b er an d Seri al Nu m b er
The Part Number and Serial number are printed on bar code label. You can find this bar code label on the outside packing, on ISA/CPU slot or on component side of PCB. For example:

Part No.

Serial No.
P/N: 91.88110.201 is part number, S/N: 91949378KN73 is serial number.
Mo d e l n a m e a n d B I O S v e r s i o n
Model name and BIOS version can be found on upper left corner of first boot screen (POST screen). For example:
AX4T II R1.00 Oct. 15. 2000 AOpen Inc.