Biostar U8798 User manual

FCC Information and Copyright
This equipment has been tested and found to comply with the
limits of a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio
communications. There is no guarantee that interference will not
occur in a particular installation.
The vendor makes no representations or warranties with respect
to the contents here of and specially disclaims any implied
warranties of merchantability or fitness for any purpose. Further
the vendor reserves the right to revise this publication and to
make changes to the contents here of without obligation to notify
any party beforehand.
Duplication of this publication, in part or in whole, is not allowed
without first obtaining the vendor’s approval in writing.
The content of this user’s manual is subject to be changed without
notice and we will not be responsible for any mistakes found in
this user’s manual. All the brand and product names are
trademarks of their respective companies.

Table of Contents
i
Notice .............................................................................................1
Mainboard Features...............................................................2
1. Features Introduction......................................................................... 2
1-1. Hardware.........................................................................................................2
1-2. BIOS & Software.........................................................................................5
1-3. Package Contents.......................................................................................5
2. Mainboard Configuration................................................................... 6
2-1. Layout of U8798..........................................................................................6
2-2. Component Index.......................................................................................7
3. CPU Configuration ............................................................................... 8
3-1. CPU Socket 478 Configuration Steps:.............................................8
3-2. CPU Fan Header: JCFAN1.....................................................................10
3-3. System Fan Header: JSFAN1.............................................................10
4. Jumpers, Headers & Connectors.................................................. 11
4-1. Front Panel Connector: JPANEL1......................................................12
4-2. ATX 20-pin Power Connector: JATXPWR1...................................14
4-3. ATX 12V Power Connector: JATXPWR2........................................14
4-4. Hard Disk Connectors: IDE1/IDE2..................................................15
4-5. Floppy Disk Connector: FDD1............................................................15
4-6. Wake On LAN Header: JWOL1...........................................................15
4-7. Clear CMOS Jumper: JCMOS1...........................................................16
4-8. Front USB Header: JUSB3....................................................................16
4-9. Front USB Header: JUSB2....................................................................17

Table of Contents
ii
4-10. 5V/ 5VSB Selection for USB: JUSBV1.........................................17
4-11. 5V/ 5VSB Selection for KB: JKBV1...............................................17
5. RAM Module Configuration............................................................. 18
5-1 DDR SDRAM..................................................................................................18
5-2. DIMM Module Configuration................................................................19
6. Peripheral Port Features ................................................................. 20
6-1. PS/2 Mouse / Keyboard Connector: JKBMS1.............................20
6-2. USB Connectors: JUSB1........................................................................21
6-3. Serial and Parallel Interface Ports....................................................22
6-4. Game (Joystick/ MIDI) Port Connector: JGAME1....................24
6-5. Audio Port Connectors: JSPKR1/JLIN1/JMIC1...........................24
6-6. Audio Subsystem......................................................................................25

MainboardFeatures
1
Notice
Introduction of system
This mainboard is designed to take advantage of the latest industry
technology to provide you with the ultimate solution in data
processing. In the tradition of its predecessors, this mainboard
continues a commitment to reliability and performance and strives
for full compliance and compatibility with industry software and
hardware standards.
U8798 Features:
1.Contains on board I/O facilities that include two serial ports, a parallel
port, a PS/2 mouse port, a PS/2 keyboard port, audio ports, USB
ports and a game port.
2.Contains on board IDE facilities for IDE devices such as hard disks
and CD-ROM Drives.
3.Supports the Intel Pentium ® 4 processor, a leading edge processor.
Complies with PC ATX form factor specifications.
4.Supports popular operating systems such as Windows NT, Windows
2000, Windows ME, Windows XP, Novell, LINUX and SCO UNIX.

MainboardFeatures
2
Mainboard Features
1. Features Introduction
1-1. Hardware
CPU:
1.Provides Socket-478.
2.Supports the Intel Pentium ® 4processor providing the new generation power
for high-end workstations and servers.
Speed:
1.Runing at 400/533 MHz Front Side Bus frequency.
2.Supports up to 2.53 GHz CPU core speeds.
3.The 33MHz 32 bit PCI 2.2 compliant.
4.The 66MHz AGP 2.0 compliant interface supports 1x, 2x and 4x data transfer
mode (only with 1.5V).
Chipset:
1.Chipset – VIA VT8754 (P4X400)/ VT8235.
2.I/O Chip – ITE IT8705.
DRAM Memory:
1.Supports 200MHz, 266MHz, 333MHz and 400MHz DDR devices.
2.Supports 64Mb, 128Mb, 256Mb, 512Mb and 1G technologies for x8 and 16
devices.
3.Max of 2 Double-Sided DDR with unbuffered / Registered (with ECC).
4.The largest memory capacity is 3 GB.

MainboardFeatures
3
Shadow RAM:
Motherboard is equipped with a memory controller providing shadow RAM and
support for ROM BIOS.
Green Functionality:
1.Supports Award BIOS ™ power management functionality.
2.Has a power down timer from 1 to 15 minutes.
3.Wakes from power saving sleep mode with any keyboard or mouse activity.
BUS Slots:
1.Contains 1 AGP slot.
2.Contains 1 CNR slot.
3.Contains 5 32-bit PCI bus slots
Flash Memory:
1.Supports flash memory functionality.
2.Supports ESCD functionality.
Built in IDE Facilities:
1.Supports four IDE hard disk drives.
2.Supports PIO Mode 4, Master Mode, and high performance hard disk drives.
3.Supports disk transfer rates up to 133 MB/second.
4.Supports Ultra DMA 33, Ultra DMA 66, Ultra DMA 100, Ultra DMA 133 Bus
Master Modes.
5.Supports IDE interface with CD-ROM.
6.Supports high capacity hard disk drives.
7.Supports LBA mode.

MainboardFeatures
4
AC’97 Sound Codec Onboard:
1.AC-LINK protocol compliance.
2.Compliant with AC’97 2.2 specification.
3.18-bit full duplex stereo ADC, DACs.
4.SNR>95 Bb throughmixer and DAC.
5.AC-3 playback required for PVD applications.
I/O facilities:
1.One multi-mode Parallel Port capable of supporting the following
specifications:
Standard & Bidirection Parallel Port.
Enhanced Parallel Port (EPP).
Extended Capabilities Port (ECP).
Normal
2.Supports two serial ports, 16550 UART.
3.Supports Infrared Data Transmission using IrDA.
4.Supports PS/2 mouse and PS/2 keyboard.
5.Supports 360KB, 720KB, 1.2MB, 1.44MB, and 2.88MB floppy disk drives.
Universal Serial Bus:
1.Supports two back panel Universal Serial Bus Ports and two front panel
Universal Serial Bus Ports.
2.Supports 480 MHz USB (2.0) (optional).
Hardware Monitor Function:
1.Monitors CPU Fan Speed.
2.Monitors System Voltage (optional).
3.Monitors System Fan Speed.
Dimensions (ATX form-factor):
24cm x 30.5cm (WxL)

MainboardFeatures
5
1-2. BIOS & Software
1.Award legal BIOS.
2.Supports APM1.2.
3.Supports USB Function.
4.Supports ACPI.
Operating System:
Offers the highest performance for MS-DOS, Windows NT, Windows 2000,
Windows ME, Windows XP, Novell, LINUX, and SCO UNIX etc.
1-3. Package Contents
1.HDD Cable.
2.FDD Cable.
3.Flash Memory Writer for BIOS Update.
4.USB Cable (Optional).
5.Rear I/O Panel for ATX Case (Optional).
6.Fully Setup Driver CD.

MainboardFeatures
6
2. Mainboard Configuration
2-1. Layout of U8798
PCI1
PCI2
AGP SLOT
PCI SLOT
PCI SLOT
PCI SLOT
DIMM2
CPU1
JATXPWR1
CPU
Socket 478
P4X400
VT8235
JSFAN1
1
JPANEL1
1
223 24
JKBMS1
Mouse &
KB
JUSB1
JPRNT1
JATXPWR2
PCI4
PCI SLOT
PCI SLOT
CNR SLOT
PCI5
CNR1
12
1
JCDIN1
Hardware
Audio
JUSB2
29 10
1
JUSB3
2
91
PRIMARY IDE CONN.
SECONDARY IDE CONN.
PCI2
Sp-Out
Line-InMic-In
Game Port
JGAME1
JWOL1
1
BAT1 JCMOS1
1
FLOPPY DISK CONN.
10
CODEC
DIMM1
DIMM3
JKBV1
JUSBV1
1
JAUDIO1
BIOS
USB
1
ITE I/O
JUSBV3
1
JUSBV1
JCOM2
ParallelPort
JCOM1
COM1COM2
JCOM1
1
13 14
JCL1
1
JSPDIF_OUT

MainboardFeatures
7
2-2. Component Index
CODEC

MainboardFeatures
8
3. CPU Configuration
3-1. CPU Socket 478 Configuration Steps:
1. Pull the lever sideways away from the socket then raise the
lever up to a 90-degree angle.
2. Locate Pin A in the socket and look for the white dot or cut
edge in the CPU. Match Pin A with the white dot/cut edge
then insert the CPU.
3. Press the lever down. Then Put the fan on the CPU and buckle
it and put the fan’s power port into the JCFAN1, then to
complete the installation.
CPU Fan
CPU

MainboardFeatures
9
CPU Configuration Layout
CPU
Socket 478
P4X400
VT8235
Hardware
Audio
BAT1
CODEC
BIOS
JSFAN1
1
ITE I/O

MainboardFeatures
10
3-2. CPU Fan Header: JCFAN1
Pin No. Assignment
1 Ground
2 +12V
3 Sense
3-3. System Fan Header: JSFAN1
Pin No. Assignment
1 Ground
2 +12V
3 Sense

MainboardFeatures
11
4. Jumpers, Headers & Connectors
JATXPWR1
CPU
Socket 478
P4X400
VT8235
JPANEL1
JATXPWR2
Hardware
Audio
BAT1
CODEC
BIOS
JKBV1
JUSBV1
1
1
JWOL1
1
JUSB2
29 10
1
JUSB3
291 10
FDD1
JCMOS1
1
IDE1-2
ITE I/O
JUSBV3
1
JCL1

MainboardFeatures
12
4-1. Front Panel Connector: JPANEL1
Pin Assignment Function Pin Assignment Function
No. No.
1 +5V 2 Sleep Control Sleep
3 NA Speaker 4 Ground Button
5 NA Connector 6 NA NA
7 Speaker 8 Power LED (+)
9 HDD LED (+) Hard Drive 10 Power LED (+) POWER
11 HDD LED (-) LED 12 Power LED (-) LED
13 Ground Reset 14 Power Button Power-on
15 Reset Control Button 16 Ground Button
17 NA 18 KEY
19 NA IrDA 20 KEY IrDA
21 +5V Connector 22 Ground Connector
23 IRTX 24 IRRX
SPK (Speaker Connector)
An offboard speaker can be installed on the motherboard as a
manufacturing option. An offboard speaker can be connected to
the motherboard at the front panel connector. The speaker
(onboard or offboard) provides error beep code information during
the Power On Self-Test when the computer cannot use the video
interface. The speaker is not connected to the audio subsystem
and does not receive output from the audio subsystem.
RST (Reset Button)
This connector can be attached to a momentary SPST switch. This
switch is usually open and when closed will cause the
motherboard to reset and run the POST (Power On Self Test).

MainboardFeatures
13
POW-LED (Power LED Connector)
This connector can be attached to an LED on the front panel of a
computer case. The LED will illuminate while the computer is
powered on.
HLED (Hard Drive LED Connector)
This connector can be attached to an LED on the front panel of a
computer case. The LED will flicker during disk activity. This disk
activity only applies to those IDE drives directly attached to the
system board.
IR (Infrared Connector)
This connector is used to attach to an infrared sensing device.
After the IrDA interface is configured, connectionless data transfer
to and from portable devices such as laptops, PDAs is possible.
SLP (Sleep/Green Button)
This connector is used to conserve energy by powering down the
monitor and the hard disk when not in use. To configure this
option, you need to connect a button from the front panel to this
connector. Depressing the button will power down the monitor
and hard drives until the system is invoked by any keyboard
activity, mouse activity, modem activity or when the sleep
button is depressed again. APM (Advanced Power Management)
must be enabled in the system BIOS and the APM driver must be
loaded.
ON/OFF (Power Button)
This connector can be attached to a front panel power switch. The
switch must pull the Power Button pin to ground for at least 50 ms
to signal the power supply to switch on or off. (The time required
is due to internal debounce circuitry on the system board). At
least two seconds must pass before the power supply will
recognize another on/off signal.

MainboardFeatures
14
4-2. ATX 20-pin Power Connector:
JATXPWR1
PIN Assignment PIN Assignment
1 +3.3V 11 +3.3V
2 +3.3V 12 -12V
3 Ground 13 Ground
4 +5V 14 PS_ON
5 Ground 15 Ground
6 +5V 16 Ground
7 Ground 17 Ground
8 PW_OK 18 -5V
9 +5V_SB 19 +5V
10 +12V 20 +5V
4-3. ATX 12V Power Connector: JATXPWR2
PIN Assignment PIN Assignment
1 +12V 3 Ground
2 +12V 4 Ground

MainboardFeatures
15
4-4. Hard Disk Connectors: IDE1/IDE2
This mainboard has a 32-bit Enhanced PCI IDE Controller that
provides PIO Mode 0~4, Bus Master, and Ultra DMA / 33, Ultra
DMA / 66,Ultra DMA / 100 functionality. It has two HDD
connectors IDE1 (primary) and IDE2 (secondary).
• IDE1 (Primary IDE Connector)
The first hard drive should always be connected to IDE1. IDE1
can connect a Master and a Slave drive. You must configure the
second hard drive on IDE1 to Slave mode by setting the jumper
accordingly.
• IDE2 (Secondary IDE Connector)
The IDE2 controller can also support a Master and a Slave drive.
The configuration is similar to IDE1. The second drive on this
controller must be set to slave mode.
4-5. Floppy Disk Connector: FDD1
The motherboard provides a standard floppy disk connector (FDC)
that supports 360K, 720K, 1.2M, 1.44M and 2.88M floppy disk
types. This connector supports the provided floppy drive ribbon
cables.
4-6. Wake On LAN Header: JWOL1
Pin No. Assignment
1 +5V_SB
2 Ground
3 Wake up

MainboardFeatures
16
4-7. Clear CMOS Jumper: JCMOS1
JCMOS1 Assignment
1 3
1-2 Closed Normal Operation (default)
1 3
2-3 Closed Clear CMOS Data
※Clear CMOS Procedures:
1.Remove AC power line.
2. Make JCMOS1 (2-3) closed.
3. Wait for five seconds.
4. Make JCMOS1 (1-2) closed.
5.Let AC power on.
6. Reset your desired password or clear the CMOS data.
4-8. Front USB Header: JUSB3
(JUSB3)
Pin Assignment Pin Assignment
1 +5V(fused) 2 +5V(fused)
3 USBP2- 4 USBP3-
5 USBP2+ 6 USBP3+
7 Ground 8 Ground
9 KEY 10 NC
The following procedures are for resetting
the BIOS password. It is important to
follow these instructions closely.

MainboardFeatures
17
4-9. Front USB Header: JUSB2
(JUSB2)
Pin Assignment Pin Assignment
1 +5V(fused) 2 +5V(fused)
3 USBP2- 4 USBP3-
5 USBP2+ 6 USBP3+
7 Ground 8 Ground
9 KEY 10 NC
4-10. 5V/ 5VSB Selection for USB: JUSBV1
JUSBV1 Assignment
1 3
1-2 Closed
5V
1 3
2-3 Closed
5V_SB
4-11. 5V/ 5VSB Selection for KB: JKBV1
JKBV1 Assignment
1 3
1-2 Closed
5V
1 3
2-3 Closed
5V_SB