Abit VA-20 User Manual Rev. 2.01
VA-20
AMD Athlon™ XP / Athlon™ / Duron™
Socket 462 System Board
User’s Manual
Rev. 1.00
Copyright and Warranty Notice
The information in this document is subject to change without notice and does not
represent a commitment on part of the vendor, who assumes no liability or
responsibility for any errors that may appear in this manual.
No warranty or representation, either expressed or implied, is made with respect to the
quality, accuracy or fitness for any particular part of this document. In no event shall
the manufacturer be liable for direct, indirect, special, incidental or consequential
damages arising from any defect or error in this manual or product.
Product names appearing in this manual are for identification purpose only and
trademarks and product names or brand names appearing in this document are
property of their respective owners.
This document contains materials protected under International Copyright Laws. All
rights reserved. No part of this manual may be reproduced, transmitted or transcribed
without the expressed written permission of the manufacturer and authors of this
manual.
VA-20
Table Of Contents
Chapter 1. Introduction .................................................... 1-1
1.1. Features & Specifications....................................................... 1-1
1.2. Layout Diagram...................................................................... 1-3
1.3. Jumpers & Connectors Description........................................ 1-4
Chapter 2. Hardware Setup.............................................. 2-1
2.1. Precautions .............................................................................2-1
2.2. Installing the System Board ...................................................2-2
2.3. Install CPU and Heatsink .......................................................2-3
2.4. System Memory .....................................................................2-5
2.4.1. Memory Configuration Table................................... 2-5
2.4.2. Installing and Removing Memory Modules............. 2-6
2.5. Connectors, Headers, and Switches .......................................2-7
2.5.1. ATX Power Connectors (ATX1).............................. 2-7
2.5.2. FAN Connectors (CPUFAN1, CASFAN1).............. 2-8
2.5.3. CMOS Memory Clearing Header (JP1) ...................2-9
2.5.4. BIOS Write Protection Header (JP3)...................... 2-10
2.5.5. CPU FSB Frequency Selector (JP8, JP9) ............... 2-11
2.5.6. Front Panel Switches & Indicators Connection
Headers (PANEL1)................................................. 2-12
2.5.7. Additional USB Port Connection Header (USB3,
USB4) .....................................................................2-13
2.5.8. Front Panel Audio Connection Header (AUDIO1) 2-14
2.5.9. Accelerated Graphics Port Slot (AGP1)................. 2-15
2.5.10. Internal Audio Source Connectors (CDIN1, AUXIN1)
................................................................................ 2-15
2.5.11. Floppy Disk Drive Connector (FDD1) ................... 2-16
2.5.12. IDE Disk Drive Connectors (IDE1, IDE2)............. 2-17
2.5.13. Additional COM Port Connection Header (COM2)2-18
2.5.14. Serial ATA connectors (SATA1, SATA2)............. 2-19
2.5.15. External I/O Panel................................................... 2-20
User’s Manual
Chapter 3. BIOS Setup...................................................... 3-1
3.1. About the Setup Utility........................................................... 3-1
3.1.1. The Standard Configuration .....................................3-1
3.1.2. Entering the Setup Utility ......................................... 3-2
3.1.3. Updating the BIOS ................................................... 3-3
3.2. Using BIOS ............................................................................3-4
3.2.1. Standard CMOS Features .........................................3-4
3.2.2. Advanced BIOS Features .........................................3-7
3.2.3. Advanced Chipset Features ......................................3-9
3.2.4. Integrated Peripherals ............................................. 3-14
3.2.5. Power Management Setup ...................................... 3-19
3.2.6. PnP/PCI Configurations.......................................... 3-24
3.2.7. PC Health Status ..................................................... 3-26
3.2.8. Frequency/Voltage Control ....................................3-27
3.2.9. Load Fail-Safe Defaults Option.............................. 3-28
3.2.10. Load Optimized Defaults Option ........................... 3-28
3.2.11. Set Password ...........................................................3-28
3.2.12. Save & Exit Setup Option....................................... 3-29
3.2.13. Exit Without Saving ............................................... 3-29
Chapter 4. Driver Installation .......................................... 4-1
4.1. Setup Items ............................................................................. 4-2
Appendix A. How to Get Technical Support ..................... A-1
VA-20
Introduction 1-1
Chapter 1. Introduction
1.1. Features & Specifications
CPU
• Supports AMD Socket 462 Athlon XP/Athlon/Duron/Sempron
Processor with 400/333/266MHz FSB
Chipset
• VIA KM400A + VT8237
Memory
• Two 184-pin DIMMs
• DDR400/333/266/200 un-buffered Memory
• Support DDR400 Memory up to 2GB
Graphics
• Integrated UniChrome Pro Graphics with 2D/3D/video controller
SATA RAID
• 2-channel SATA 150 support RAID 0 & RAID 1
LAN
• Onboard 10/100Mb LAN (VIA VT6103L 10/100Mbps PHY)
Audio
• 6-Channel AC 97 CODEC onboard (Realtek ALC655)
Internal I/O Connectors
• 1x AGP 8X/4X slot
• 3x PCI slots
• 1x Floppy Port supports up to 2.88MB
• 2x Ultra DMA 33/66/100/133 Connectors
• 2x Serial ATA 150 Connectors
• 2x USB 2.0 headers (Each header support two USB 2.0 devices)
• 1x CD-IN, 1x AUX-IN
• 1x FP-Audio header
• 1x COM2 header
User’s Manual
1-2 Chapter 1
Back Panel I/O
• 1x PS/2 Keyboard, 1x PS/2 Mouse
• 1x Parallel Port, 1x Serial Port, 1x VGA Port,
• 4x USB 2.0, 1x RJ-45 LAN Connector
• 3 holes Audio connectors (Line-out, Line-in, Microphone)
Miscellaneous
• Micro ATX form factor (244mm x 220mm)
All brand names and trademarks are the property of their respective
owners.
This motherboard is customized for certain system configurations; and
may not fit system integration in all DIY ways. Before purchase this
product, please check ABIT web site for recommended device listings, or
contact sales/tech support people.
Specifications and information contained herein are subject to change
without notice.
VA-20
Introduction 1-3
1.2. Layout Diagram
User’s Manual
1-4 Chapter 1
1.3. Jumpers & Connectors Description
Jumpers Description Default Setting
JP1 CMOS Memory Clearing Header Pins 1-2 Closed (Normal)
JP3 BIOS Write Protection Header
JP8/JP9 CPU FSB Frequency Selector
Connectors Description
AGP1 Accelerated Graphics Port Slot
ATX1 20-pin ATX12V Power Connector
AUDIO1 Front Panel Audio Connection Header
CDIN1/AUXIN1 Internal Audio Connectors
COM2 Additional COM Port Connection Header
CPUFAN1/CASFAN1 Fan Power Connectors
DIMM1/DIMM2 DDR DIMM Slots
FDD1 Floppy Disk Drive Connector
IDE1/IDE2 Hard Disk Drive Connectors
PANEL1 Front Panel Switch Connection Headers
PCI1/PCI2/PCI3 32bit/33MHz PCI Slots
SATA1/SATA2 Serial ATA connectors
USB3/USB4 Additional USB Port Connection Headers
Pins 1-2 Closed
(Write Protect Enabled)
JP8: Pins 2-3 Closed
JP9: Pins 1-2 Closed
(133MHz)
VA-20
Hardware Setup 2-1
Chapter 2. Hardware Setup
2.1. Precautions
Please pay attention to the following precautions before setting up any hardware.
1. Always switch off the power supply and unplug the power cord from the wall
outlet before installing the board or changing any settings.
2. Ground yourself properly by wearing a static safety wrist strap before removing
the board from the antistatic bag.
3. Hold the board by its edges. Avoid touching any component on it.
4. Avoid touching module contacts and IC chips
5. Place the board on a grounded antistatic surface or on the antistatic bag that came
with the board.
User’s Manual
2-2 Chapter 2
2.2. Installing the System Board
Before installing the system board, exam your chassis to ensure this system board fits
into it.
1. Face the side of the I/O ports toward the rear part of the chassis.
2. Locate the screw holes on the system board and the chassis base.
3. Place all the studs or spacers needed on the chassis base and have them tightened.
4. Line up all the screw holes on the board with those studs or spacers on the chassis.
5. Tightens all the screw holes.
ATTENTION: To prevent shorting the PCB circuit, please REMOVE the metal studs
or spacers if they are already secured on the chassis base and are without
mounting-holes on the system board to align with.
VA-20
Hardware Setup 2-3
2.3. Install CPU and Heatsink
• Installing a heatsink and cooling
fan is necessary for heat to
dissipate from your processor.
Failing to install these items
may result in overheating and
processor damage.
• The AMD Socket A processor
will produce a lot of heat while
operating, so you need to use a
large heat sink that is especially
designed for the AMD socket A
processor. Otherwise, it may
result in overheating and
processor damage.
• If your processor fan and its
power cable are not installed
properly, never plug the ATX
power cable into the
motherboard. This can prevent
possible processor damage.
• Please refer to your processor
installation manual or other
documentation with your
processor for detailed
installation instructions.
This motherboard provides a ZIF
(Zero Insertion Force) Socket 462
to install AMD Socket A CPU. The
CPU you bought should have a kit
of heatsink and cooling fan along
with. If that’s not the case, buy one
specially designed for Socket A.
Please refer to the figure shown here
to install CPU and heatsink. (For
reference only. Your Heatsink &
Fan Assembly may not be exactly
the same as this one.)
User’s Manual
2-4 Chapter 2
1. Locate the Socket 462 on this motherboard. Pull the CPU release lever sideways
to unlatch and then raise it all the way up.
2. Align the CPU notch to the socket notch for CPU. Drop the processor with its pin
side down into the CPU socket. Do not use extra force to insert CPU; it only fit in
one direction. Close the CPU release lever.
3. Remove the plastic film adhesive on the heatsink. Make sure the stepped portion
of the heatsink is facing toward the end of the socket that reads “Socket 462”. Put
the heatsink faces down onto the processor until it covers the processor
completely.
4. Push down the short end of the retaining clip first to lock up with the center lug at
the bottom of the socket.
5. Use a screwdriver to insert into the slot at the long end of the retaining clip. Push
the clip downward to lock up with the center lug at the top of the socket. The
heatsink & fan assembly is now firmly attached on the CPU socket.
6. Attach the fan connector of Heatsink & Fan Assembly with the fan connector on
the motherboard.
ATTENTION: Do not forget to set the correct bus frequency and multiple for your
processor.
VA-20
Hardware Setup 2-5
2.4. System Memory
This system board provides two 184-pin DDR DIMM slots for DDR 400/333/266/200
un-buffered memory modules.
2.4.1. Memory Configuration Table
DIMM DIMM Module Total Memory
1 256MB, 512MB, 1GB 256MB ~ 1GB
2 256MB, 512MB, 1GB 256MB ~ 1GB
Total System Memory 256MB ~ 2GB
User’s Manual
2-6 Chapter 2
2.4.2. Installing and Removing Memory Modules
Power off the computer and unplug the
AC power cord before installing or
removing memory modules.
1. Locate the DIMM slot on the board.
2. Hold two edges of the DIMM
module carefully, keep away of
touching its connectors.
3. Align the two notch keys on the module with the two ribs on the slot.
4. Firmly press the module into the slots until the ejector tabs at both sides of the slot
automatically snaps into the mounting notch. Do not force the DIMM module in
with extra force as the DIMM module only fit in one orientation.
5. To remove the DIMM modules, push the two ejector tabs on the slot outward
simultaneously, and then pull out the DIMM module.
ATTENTION: As the static electricity can damage the electronic components of the
computer or optional modules, make sure you are discharged of static electricity by
touching a grounded metal object briefly before starting these procedures.
VA-20
Hardware Setup 2-7
2.5. Connectors, Headers, and Switches
All the connectors, headers and switches mentioned here are depending on your
system configuration. Some features you may (or may not) have to connect or to
configure depending on the peripherals you have connected.
WARNING: Always power off the computer and unplug the AC power cord before
adding or removing any peripheral or component. Failing to so may cause severe
damage to your system board and/or peripherals. Plug in the AC power cord only after
you have carefully checked everything.
2.5.1. ATX Power Connectors (ATX1)
This connector provides the connection to ATX12V power supply.
User’s Manual
2-8 Chapter 2
2.5.2. FAN Connectors (CPUFAN1, CASFAN1)
These connectors each provide power to the cooling fans installed in your system.
The CPU must be kept cool by using a powerful fan with heatsink. The system is
capable of monitoring the speed of the CPU fan.
• CPUFAN1: Power connector for CPU cooling fan
• CASFAN1: Power connector for chassis cooling fan
WARNING: These fan connectors are not jumpers. DO NOT place jumper caps on
these connectors.
VA-20
Hardware Setup 2-9
2.5.3. CMOS Memory Clearing Header (JP1)
This header uses a jumper cap to clear the CMOS memory.
• Pin 1-2 shorted (default): Normal operation.
• Pin 2-3 shorted: Clear CMOS memory.
ATTENTION: Turn the system power off first (including the +5V standby power)
before clearing the CMOS memory. Failing to do so may cause your system to work
abnormally or malfunction.
User’s Manual
2-10 Chapter 2
2.5.4. BIOS Write Protection Header (JP3)
This header uses a jumper cap to protect the BIOS contents from accidentally flashed.
• Pin 1-2 shorted (Default): Write Protect Enabled.
• Pin 2-3 shorted: Write Protect Disabled.
VA-20
Hardware Setup 2-11
2.5.5. CPU FSB Frequency Selector (JP8, JP9)
These headers use jumper caps to select the CPU FSB Frequency.
CPU FSB Frequency JP8 JP9
100MHz 1-2 1-2
133MHz 2-3 1-2
166MHz 2-3 2-3
200MHz 1-2 2-3
User’s Manual
2-12 Chapter 2
2.5.6. Front Panel Switches & Indicators Connection Headers
(PANEL1)
These headers are used for connecting switches and LED indicators on the chassis
front panel. The mark “+” align to the pin in the figure below stands for positive
polarity for the LED connection.
Pin Definition Pin Definition
VA-20
1 HD LED + 2 Message LED +
3 HD LED - 4 Message LED -
5 RESET 6 Power Switch
7 RESET 8 Power Switch
9 Reserved 10 NC
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