Biostar U8788 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.........................................................................................6
1-3. Package Contents.......................................................................................6
2. Mainboard Configuration................................................................... 7
2-1. Layout of U8788..........................................................................................7
2-2. Component Index.......................................................................................8
3. CPU Configuration ............................................................................... 9
3-1. CPU Socket 478 Configuration Steps:.............................................9
3-2. CPU Fan Header: JCFAN1.....................................................................11
3-3. System Fan Header: JSFAN1.............................................................11
4. Jumpers, Headers & Connectors.................................................. 12
4-1. Front Panel Connector: JPANEL1......................................................13
4-2. ATX 20-pin Power Connector: JATXPWR1...................................15
4-3. Hard Disk Connectors: IDE1/IDE2/IDE3(Optional)................15
4-4. Floppy Disk Connector: FDD1............................................................16
4-5. Serial ATA Connector: JSATA1/JSATA2 (Optional).................16
4-6. Wake On LAN Header: JWOL1...........................................................16
4-7. Clear CMOS Jumper: JCMOS1...........................................................17
4-8. Front USB Header: JUSB3 (V2.0)....................................................17
4-9. Front USB Header: JUSB4 (V2.0)....................................................18

Table of Contents
ii
4-10. 5V / 5VSB Selection for KB: JKBV1..............................................18
4-11. ATX 12V Power Connector: JATXPWR2......................................18
4-12. Front 1394 Header: J1394A1 (Optional)...................................18
4-13. Front 1394 Header: J1394B1 (Optional)...................................19
4-14. Front 1394 Header: J1394C1 (Optional)...................................19
4-15. 5V/ 5VSB Selection for USB: JUSBV1.........................................19
4-16. 5V/ 5VSB Selection for USB: JUSBV3.........................................20
4-17. 5V/ 5VSB Selection for USB: JUSBV4.........................................20
5. RAM Module Configuration............................................................. 21
5-1. DDR SDRAM................................................................................................21
5-2. How to install DDR DIMM Module....................................................22
6. Peripheral Port Features ................................................................. 23
6-1. PS/2 Mouse / Keyboard Connector: JKBMS1.............................23
6-2. USB Port Connector: JUSBLAN1.......................................................24
6-3. Serial and Parallel Interface Ports....................................................26
6-4. Game (Joystick/MIDI) Port Connector: JAUD_GAME............28
6-5. Audio Port Connectors: JSPKR1/JLIN1/JMIC1...........................28
6-6. Audio Subsystem......................................................................................29

Chapter 1 Motherboard Description
1-1
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.
U8788 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.

Chapter 1 Motherboard Description
1-2
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 (Jumpless).
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.
Chipset:
Chipset – VIA VT8753E (P4X266E)/ VT8235.
Super I/O
Chipset – ITE 8705
DRAM Memory:
1. Supports 200MHz, 266MHz DDR SDRAM devices.
2. Supports 64Mb, 128Mb, 256Mb and 512Mb technologies for x8 and 16
devices.
3. Max of 3 Double-Sided DDR SDRAM with unbuffered / Registered.
4. The largest memory capacity is 3 GB.

Chapter 1 Motherboard Description
1-3
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.
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.

Chapter 1 Motherboard Description
1-4
AC’97 Sound Codec Onboard (Optional):
1. AC-LINK protocol comfliance.
2. Compliant with AC’97 specification.
3. 18-bit full duplex stereo ADC, DACs.
4. SNR>95 Bb throughmixer and DAC.
5. Full-duplex codec.
6. Earphone buffer.
7. Line in/ rear out share jack capability
8. Mic in/ center and bass out share jack capability.
9. Internal PLL built-in saving additional crystal.
10. Meet Microsoft’s® PC2001 requirements.
11. Support 6-CH speaker mode.
H/W Audio (Optional)
1. 6CH DAC for AC3 5.1CH purpose.
2. HRTF-based 3D positional audio, supporting DirectSound 3D and A3D
interface.
3. Supports 4.1/5.1 speakers, C3DX positional audio in 4/ 6 CH speaker
mode.
4. Legacy audio SBPRO compatible.
5. DLS-based wavetable music synthesizer, supports DirectMusic.
6. Built-in 32ohm Earphone buffer.
7. Built-in PCtel HSP56 Modem interface.
8. Drivers support EAX, Karaoke Key, Echo.
9. MPU-401 port.
10. 16-bit full duplex CODEC.
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 one serial port, 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.

Chapter 1 Motherboard Description
1-5
Universal Serial Bus V2.0:
Supports two back panel Universal Serial Bus Port and four front panel
Universal Serial Bus Ports.
Hardware Monitor Function:
1.Monitors CPU Fan Speed.
2.Monitors System Voltage.
Dimensions (ATX form-factor):
30.5cm x 24.4cm (LxW)

Chapter 1 Motherboard Description
1-6
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.

Chapter 1 Motherboard Description
1-7
2. Mainboard Configuration
2-1. Layout of U8788
JKBMS1
JGAME1
K/B
&
Mouse
USB & LAN
JCOM1
COM1
Parallel Port
COM1
GAME Port
MIC-IN SP-OUTLINE-IN
JCOM2
Socket 478
JCFAN1
1
DDR1
DDR2
DDR1
DDR2
DDR1DDR3
JATXPWR1
IDE2IDE1 FDD1
JATXPWR2
JAUDIO1
AGP1
PCI1
PCI2
PCI3
PCI4
PCI5
CNR1
CODEC
JUSB3JUSB4
JUSBV4
JUSBV3
BIOS
JCDIN1
H/W
Audio 1394
CHIP
J1394B1
J1394A1 J1394C1
IDE3
JSFAN1
JPANEL1
Serials
ATA
Controller JSATA2JSATA1
BAT1
JCMOS1
JWOL1
JKBV1
JUSBV1
1
1
1
29 10
1
1
29 10 1
29 10
1
2
9
10
1
12
2324
1
1
1
11
1
2
9
10
1
2
9
10
JCOM2
P4X266E
VT8235
ITE I/O

Chapter 1 Motherboard Description
1-8
2-2. Component Index
COM1
Socket 478
DDR1
DDR2
DDR1
CODEC
BIOS
1394
CHIP
Serials
ATA
Controller
BAT1
P4X266E
VT8235
H/W
Audio
ITE I/O

Chapter 1 Motherboard Description
1-9
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

Chapter 1 Motherboard Description
1-10
CPU Configuration Layout
COM1
Socket 478
DDR1
DDR2
DDR1
CODEC
BIOS
1394
CHIP
Serials
ATA
Controller
BAT1
H/W
Audio
P4X266E
VT8235
ITE I/O
JCFAN1
1
JSFAN1
1

Chapter 1 Motherboard Description
1-11
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

Chapter 1 Motherboard Description
1-12
4. Jumpers, Headers & Connectors
COM1
Socket 478
DDR1
DDR2
DDR1
DDR2
DDR1DDR3
JATXPWR1
IDE1-2
FDD1
CODEC
BIOS
1394
CHIP IDE3
JPANEL1
Serials
ATA
Controller
BAT1
JKBV1
1
JUSBV1
1
JATXPWR2
J1394A1
1
29 10
J1394B1
1
29 10
J1394C1
1
2
9
10
JSATA1
JSATA2
JCMOS1
1
JWOL1
1
JUSB4
JUSBV4
1
JUSBV3
1
1
2
9
10
JUSB3
1
2
9
10
H/W
Audio
P4X266E
VT8235
ITE I/O

Chapter 1 Motherboard Description
1-13
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 VCC5 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).

Chapter 1 Motherboard Description
1-14
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.

Chapter 1 Motherboard Description
1-15
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. Hard Disk Connectors:
IDE1/IDE2/IDE3(Optional)
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

Chapter 1 Motherboard Description
1-16
controller must be set to slave mode.
• IDE3 (RAID IDE Conector) (Optional)
The IDE3 controller supports RAID 0/1 Function.
4-4. 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.
4-5. Serial ATA Connector: JSATA1/JSATA2
(Optional)
The motherboard has a PCI to SATA Controller with 2 channels
STAT interface, it satisfy the SATA 1.0 spec and can transfer data
with 1.5GHz speed.
4-6. Wake On LAN Header: JWOL1
Pin No. Assignment
1 5V SB
2 Ground
3 Wake up

Chapter 1 Motherboard Description
1-17
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 ACpowerline.
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 (V2.0)
(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.