Acorp VIA KT400A User manual

AMD Socket A
VIA KT400A + VT8235
ATX Motherboard
User’s Guide
Version 1.0

Declaration of Conformity
According to 47 CFR, Parts 2 and 15 of the FCC Rules
The following designated product:
EQUIPMENT: MAINBOARD
is a Class B digital device that complies with 47 CFR Parts 2 and 15 of the FCC
Rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may
cause undesired operation.
This declaration is given to the manufacturer:
CHAINTECH-EXCEL COMPUTER INC.
No. 7-1, Chung Shin Rd., Tu Cheng,
Taipei Hsien, Taiwan, ROC
http://www.chaintech.com.tw
Chaintech President: Simon Ho
Signature:

Federal Communications Commission Statement
This device complies with FCC Rules Part 15. Operation is subject to the following two conditions:
* This device may not cause harmful interference.
* This device must accept any interference received, including interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits for 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. If this equipment is not
installed and used in accordance with the manufacturer's instructions, it may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
* Reorient or relocate the receiving antenna.
* Increase the separation between the equipment and receiver.
* Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
* Consult the dealer or an experienced radio/TV technician for help.
The use of shielded cables for connection of the monitor to the graphics card is required to assure compliance
with FCC regulations. Changes or modifications to this unit not expressly approved by the party responsible for
compliance could void the user's authority to operate this equipment.
Canadian Department of Communications Statement
This digital apparatus does not exceed the Class B limits for audio noise emissions from digital apparatuses set
out in the Radio Interference Regulations of the Canadian Department of Communications.
Manufacturer's Disclaimer Statement
The information in this document is subject to change without notice and does not represent a commitment on the
part of the vendor. No warranty or representation, either expressed or implied, is made with respect to the quality,
accuracy or fitness for any particular purpose of this document. The manufacturer reserves the right to make changes to
the content of this document and/or the products associated with it at any time without obligation to notify any person or
organization of such changes. In no event will the manufacturer be liable for direct, indirect, special, incidental or
consequential damages arising out of the use or inability to use this product or documentation, even if advised of the
possibility of such damages. This document contains materials protected by copyright. All rights are reserved. No part of
this manual may be reproduced or transmitted in any form, by any means or for any purpose without expressed written
consent of its authors. Product names appearing in this document are mentioned for identification purposes only. All
trademarks, product names or brand names appearing in this document are registered property of their respective owners.
Printed in Taiwan.
July 2003
OST-CONSUMER
RECYCLED PAPER
100%

TABLE OF CONTENTS
Chapter 1 Introduction.................................................................. 1
1-1 Product Specifications ............................................................................................1
1-2 Package Contents....................................................................................................1
1-3 Motherboard Layout...............................................................................................2
Chapter 2 Hardware Setup........................................................... 3
2-1 Installing a CPU Processor for Socket A................................................................3
2-2 Setting Your CPU’s Performance ...........................................................................4
2-3 Main Memory Configuration..................................................................................6
2-4 Connector and Jumper Settings..............................................................................9
Chapter 3 BIOS Setup Program................................................. 17
3-1 Standard CMOS Setup..........................................................................................18
3-2 Advanced BIOS Features .....................................................................................19
3-3 Advanced Chipset Features ..................................................................................22
3-4 Integrated Peripherals...........................................................................................26
3-5 Power Management Setup....................................................................................29
3-6 PNP/PCI Configurations.......................................................................................32
3-7 Frequency/Voltage Control...................................................................................33
3-8 Load Fail-Safe Defaults........................................................................................34
3-9 Load Optimized Defaults......................................................................................34
3-10 Supervisor Password & User Password Setting.................................................34
3-11 Save and Exit Setup............................................................................................35
3-12 Exit Without Saving............................................................................................35
Chapter 4 DRIVER Setup........................................................... 36
4-1 VIA Service Pack Setup .......................................................................................36
4-2 Audio Driver Setup...............................................................................................40
4-3 LAN Driver Setup.................................................................................................43
4-4 USB 2.0 Driver.....................................................................................................45

Chapter 1
1
Chapter 1 Introduction
1-1 Product Specifications
Processor
- Supports AMD Socket A Athlon XP/Athlon/Duron CPU
- Supports system clock at 200/266/333 MHz
Chipset
- VIA KT400A + VT8235
Main Memory
- Supports three 184 pin DDR DIMMs up to 3GB
- Supports PC 2100/2700/3200 DDR SDRAM modules
Expansion Slots
- One Universal AGP slot for both 4X/8X AGP
- Five 32-Bit PCI slots (v2.2 compatible)
Audio Subsystem via AC-Link
- With external high quality 6-channel AC’97 Codec
- Complete software driver supports for Windows® OS
Ultra DMA 66/100/133 PCI IDE Controller
- Supports two IDE ports up to 4 ATAPI devices
- Supports PIO Mode 4 up to 16.6MBps, Multi Mode 4 up to 66MBps, Multi Word Mode
5 up to 100MBps and Multi Word Mode 6 up to 133MBps with Bus Mastering
- Bus-Mastering software drivers for all common multi-tasking operating systems
USB 2.0/1.1 Host Controller
- Three EHCI USB 2.0 and UHCI USB 1.1 controllers support total six USB 2.0/1.1 ports
- Supports USB 2.0 high-speed device @480 Mb/s transfer rates
On board ITE 8700 Super I/O Functions
- Two UARTs support serial port
- One SPP/ECP/EPP parallel port
- One floppy disk drive connector supports up to 2.88MB
Fast Ethernet Controller with MII Interface
- Supports 10/100Mbps Fast Ethernet with external VIA VT6103 PHY
Boot-Block Flash ROM
- Award system BIOS supports PnP, APM, DMI, ACPI, & Multi-device booting features.
1-2 Package Contents
This product comes with the following components:
1. Motherboard x 1
2. 40-Pin UDMA-100 IDE Cable x 1
Blue to motherboard, Gray to Master and Black to Slave
3. 34-Pin floppy Disk Drive Cable x 1
4. User’s Guide x 1
5. Driver CD x 1

Chapter 1
2
1-3 Motherboard Layout

Chapter 2
3
Chapter 2 Hardware Setup
If your motherboard has already been installed in your computer you may still need to
refer to this chapter if you plan to upgrade your system's hardware.
This mother
board is electrostatic sensitive. Do not touch without
wearing proper s
afety gadget and make sure to disconnect the power
cable from the power source before performing any work on your
motherboard. Not doing so may result in electrical shock!
2-1 Installing a CPU Processor for Socket A
The Socket A, designed for AMD® Athlon XP/Athlon/Duron processors, has been
incorporated as a standard motherboard specification. To insert your CPU into Socket A
please do the following:
1. Locate a cut edge on the top surface of the CPU close to one if it’s corners. The same
corner will also be cut off, leaving a noticeable notch in the CPU’s corner. These
markings indicate Pin 1 of the CPU.
2. Pull up the lever of Socket 462 so that it is perpendicular with the surface of the
motherboard. Gently insert the CPU with Pin 1 at the same corner of Socket 462 that
contains the end of the lever. Allow the weight of the CPU to push itself into place.
Do not apply extra pressure as doing so may result in damaging your CPU. Snap the
lever back into place.
Installing an AMD® approved heat sink with cooling fan is necessary for proper heat
dissipation from your CPU. Failing to install these items may result in overheating and
possible burnout of your CPU.
Note: In order to boot up with a newly installed CPU, AC Power must be switched off
before installation.

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4
2-2 Setting Your CPU’s Performance
Frequency Configuration:
If you install a CPU on this motherboard, you must set the [Front Side Bus Frequency]
JP3 according to your processor.
* CPU Speed = Multiplier x FSB Frequency
AMD (K7) Duron CPU
Model
CPU Speed
FSB
Frequency
Multiplier
Vcore
L2
Cache
Micron
process
600 600 MHz
100 6.0 1.6V
64KB
0.18
650 650 MHz
100 6.5 1.6V
64KB
0.18
700 700 MHz
100 7.0 1.6V
64KB
0.18
750 750 MHz
100 7.5 1.6V
64KB
0.18
800 800 MHz
100 8.0 1.6V
64KB
0.18
850 850 MHz
100 8.5 1.6V
64KB
0.18
900 900 MHz
100 9.0 1.6V
64KB
0.18
950 950 MHz
100 9.5 1.6V
64KB
0.18
1.0G 1.0 GHz 100 10.0 1.6V
64KB
0.18
1.1G 1.1 GHz 100 11.0 1.6V
64KB
0.18
1.2G 1.2 GHz 100 12.0 1.6V
64KB
0.18
1.3G 1.3 GHz 100 13.0 1.6V
64KB
0.18
AMD Athlon CPU (K7/Thunderbird)
Model CPU Speed
FSB
Frequency
Multiplier
Vcore
L2
Cache
Micron
process
700 700MHz 100 7.0 1.70V
256KB
0.18
750 750MHz 100 7.5 1.70V
256KB
0.18
800 800MHz 100 8.0 1.70V
256KB
0.18
850 850MHz 100 8.5 1.70V
256KB
0.18
900 900MHz 100 9.0 1.75V
256KB
0.18
950 950MHz 100 9.5 1.75V
256KB
0.18
1000 1000MHz 100 10.0 1.75V
256KB
0.18
1100 1100MHz 100 11.0 1.75V
256KB
0.18
1200 1200MHz 100 12.0 1.75V
256KB
0.18
1300 1300MHz 100 13.0 1.75V
256KB
0.18
1400 1400MHz 100 14.0 1.75V
256KB
0.18

Chapter 2
5
1000 1000MHz 133 7.5 1.75V
256KB
0.18
1113 1113MHz 133 8.5 1.75V
256KB
0.18
1200 1200MHz 133 9.0 1.75V
256KB
0.18
1333 1333MHz 133 10.0 1.75V
256KB
0.18
1400 1400MHz 133 10.5 1.75V
256KB
0.18
AMD Athlon XP CPU (Palomino/Thoroughbred)
Model CPU Speed
FSB
Frequency
Multiplier
Vcore
L2
Cache
Micron
process
1500+ 1333MHz 133 10.0 1.7V 256KB
0.18
1600+ 1400MHz 133 10.5 1.7V 256KB
0.18
1700+ 1466MHz 133 11.0 1.7/1.6V
256KB
0.18/0.13
1800+ 1533MHz 133 11.5 1.7/1.6V
256KB
0.18/0.13
1900+ 1600MHz 133 12.0 1.7/1.6V
256KB
0.18/0.13
2000+ 1666MHz 133 12.5 1.7/1.6V
256KB
0.18/0.13
2100+ 1733MHz 133 13.0 1.7/1.6V
256KB
0.18/0.13
2200+ 1800MHz 133 13.5 1.65V
256KB
0.13
2400+ 2000MHz 133 15.0 1.65V
256KB
0.13
2600+ 2133MHz 133 16.0 1.65V
256KB
0.13
2600+ 2075MHz 166 12.5 1.65V
256KB
0.13
2700+ 2166MHz 166 13.0 1.65V
256KB
0.13
AMD Athlon XP CPU (Barton)
2500+ 1833MHz 166 11.0 1.65V
512KB
0.13
2600+ 1917MHz 166 11.5 1.65V
512KB
0.13
2800+ 2075MHz 166 12.5 1.65V
512KB
0.13
3000+ 2167MHz 166 13.0 1.65V
512KB
0.13
3000+ 2100MHz 200 10.5 1.65V
512KB
0.13
3200+ 2200MHz 200 11.0 1.65V
512KB
0.13

Chapter 2
6
2-3 Main Memory Configuration
The DDR SDRAM memory system consists three banks, each bank supports up to 1GB
of memory.
DDR SDRAM Specifications
Memory
Frequency Internal System BUS Frequency
133 MHz 266 MHz
166 MHz 333 MHz
200 MHz 400 MHz
DIMM type: 2.5V, unbuffered 184 pin 64/128/265/512-bit DDR SDRAM.
Module size: Single/double-sided 64/128/256/512Mbytes or 1GBbtes.
Parity: Ether parity or non-parity.
Location
64 MB
128 MB
256 MB
512 MB
1.0 GB
DDR 1 V V V V V
DDR 2 V V V V V
DDR 3 V V V V V
In order to take effect of PC3200 DDR SDRAM modules please install memory
modules on DIMM1 + DIMM3 slots or DIMM2 + DIMM3 slots .For PC 2700 DDR
SDRAM modules you can install memory modules in all three DIMM slots.

Chapter 2
7
Note:
If you are using DDR 400 and the brand of the module is Winbond, please adjust your
BIOS setting according to the following instructions to avoid compatibility problem.
1. Press [Delete] to enter BIOS setup program when you turn on or reboot your system.
2. Select [Advanced Chipset Features].
3. Select [DRAM Clock].

Chapter 2
8
4. Adjust the setting of DRAM Timing to [Turbo]
If there is no incompatibility problem occurred while you use the module, then it’s not
necessary to change the memory setting.

Chapter 2
9
2-4 Connector and Jumper Settings
Connectors are used to link the system board with other parts of the system, including the
power supply, the keyboard, and the various controllers on the front panel of the system
case.
The power supply connector is the last connection to be made while installing a
motherboard. Before connecting the power supply, please make sure it is not connected to
the power source.
Note: All cables are security-proof.
PW1 (ATX Power Supply Connector)
The power cord leading from the system's power supply to the external power source
must be the very last part connected when assembling a system. The ATX power supply
provides a single 20-pin connector interface, which incorporates standard +/-5V, +/-12V,
optional 3.3V and Soft-power signals. The Soft power signal, a 5V trickle supply is
continuously supplied when AC power is available. When the system is in the Soft-Off
mode, this trickle supply maintains the system in its minimum power state.
The ATX 12V power supply has a new +12V (4-pin) and +5V/3.3V (6-pin) auxiliary
power connector in order to enable the delivery of more +12 VDC and +5/3.3V VDC
current to the motherboard.
Power-On By Modem
While in Soft-Off state, if an external modem ring-up signal is detected, the system will
be activated and can be remotely accessed. You may enable this function in BIOS's
Power Management Setup menu. (See section 3. 5)
Blinking LED in Suspend Mode
While in Suspend mode, the LED light on the front panel of your computer will flash.
Suspend mode is entered by pressing the Override Power Button, pushing the Green

Chapter 2
10
button on your ATX case, or by enabling the Power Management and Suspend Mode
options in BIOS's Power Management menu. (See section 3.5)
Poly-fuse Over Current Protection
The poly-fuse protects the system from dangerous voltages that the system might be
exposed to via the keyboards or USB connectors. In case of such an exposure, the
poly-fuse will immediately be disconnected from the circuit, just like a normal fuse. After
being disconnected for a certain period of time, the poly-fuse will return to its normal
state and the keyboard or USB connector can function properly again. Unlike
conventional fuses, the poly-fuse will not need to be replaced, relieving the user from
such inconveniences.
CN1A (Front Panel Connector)
1. PWR-SW (Over-ride Power Button Connector)
The power button on the ATX chassis can be used as a normal power switch as well as a
device to activate Advanced Power Management Suspend mode. This is power- saving
mode used for saving electricity when the computer is not in use for a long period of
time. The Soft-OFF by PWR-BTTN function in BIOS's Power Management Setup menu
must be set to [Delay 4 Sec.] to activate this function.
When the Soft-OFF by PWR-BTTN function is enabled, pushing the power button
rapidly will switch the system to Suspend mode. Any occurrence of external activities
such as pressing a key on the keyboard or moving the mouse will bring the system back
to Full-On. Pushing the button while in Full-On mode for more than [4 seconds] will
switch the system completely off. See Over-ride Power Button Operation diagram.
2. P-LED (Power LED Connector)
The power indicator LED shows the system's power status. It is important to pay
attention to the correct cables and pin orientation (i.e. Be careful not to reverse the order
of these two connectors.)
3. G-BTN/G-LED (Green Button Switch/LED Connector)
Some ATX cases provide a Green button switch, which is used to put the system in
Suspend mode. While in Suspend mode, the power supply to the system is reduced to a

Chapter 2
11
trickle, the CPU clock is stopped, and the CPU core is in its minimum power state. The
system is activated whenever the keyboard or mouse is touched. The system resumes in
different ways as defined by Power Management Setup screen in BIOS.
4. RESET (System Reset Switch Connector)
This connector should be connected to the reset switch on the front panel of the system
case. The reset switch allows you to restart the system without turning the power off.
5. SPEAKER (Speaker Connector)
This 4-pin connector connects to the case-mounted speaker.
6. HD-LED (IDE Activity LED Connector)
The IDE activity LED lights up whenever the system reads/writes to the IDE devices.
FD1 (Floppy Connector)
The motherboard provides a standard floppy disk drive connector that supports 360K,
720K, 1.2M, 1.44M and 2.88M floppy disk types. Use this connector to connect to a
Floppy disk drive of 34 pins .
IDE1 / 2 (IDE Hard-Disk Connector)
The motherboard has a 32-bit Enhanced PCI IDE and Ultra ATA66/100/133 controller
that provides PIO mode 0~4, Bus Master, and Ultra ATA66/100/133 function. This

Chapter 2
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connector is used for connecting 40 pins of ATAPI devices.
IDE 1 only connects two IDE devices. (Primary Master/Slave)
IDE 2 only connects two IDE devices. (Secondary Master/Slave)
JP1 (CMOS Clear Jumper)
There is a CMOS RAM on board that has a power supply from external battery to keep
the data and system configuration. To clear the contents of the CMOS, please follow the
steps below.
1. Disconnect the system power supply from the power source.
2. Set the jumper cap at location [2-3] for <5 seconds>, and then set it back to the
default position.
3. Connect the system's power and then start the system.
4. Enter BIOS's CMOS Setup Utility and choose Load Setup Defaults. Type [Y] and
then press [Enter] to continue.
5. Set the system configuration in the Standard CMOS Setup menu.
Pin
Definition
1-2
Normal (default)
2-3
Clear CMOS Data

Chapter 2
13
JP6 (Enable/Disable USB 0/1 Device Wake-Up Jumper)
An USB keyboard hot key or an USB mouse click can activate this board. To use this
function, select a hot key of your choice at the USB Resume from S3 option under Wake
Up Events in the BIOS's Power On Management screen. You must also set this jumper's
cap to pins 2-3 to use this function.
FAN1 / FAN2 /FAN3 (CPU/System/Case Cooling Fan Connectors)
The board's hardware management is able to detect the CPU and system fan
speed in rpm (revolutions per minute). The wiring and plugging may vary depending on
the manufacturer. On standard fans, the red is positive (+12V) and the black is ground.
Pin
Definition
1-2
Disable (default)
2-3
Enable

Chapter 2
14
CN2/CN2A (CD-ROM Audio-in Connector)
Use the audio cable enclosed with your CD-ROM disk drive to connect the CD-ROM to
your motherboard. This will enable your CD-ROM's audio function.
CN5 [WOL (Wake-on-LAN) Connector]
Enable the Wake Up On LAN selection in BIOS's Power Management Menu to use this
function. The capability to remotely manage PCs on a network is a significant factor in
reducing administrative and ownership costs. Magic Packet technology is designed to
give WOL capability to LAN controller. This header is used to connect an add-in NIC
(Network Interface Card) that gives WOL function to the motherboard.

Chapter 2
15
CN5A [WOM (Wake-on-Modem) Connector]
Enable the Wake Up On Modem selection in BIOS's Power Management Menu to
activate this function. This header is used to connect an add-in modem card, which gives
WOM capability to the motherboard.
CN23/CN23A (Front USB Connector for USB 2/3 and 4/5)
USB Port 2/3 ÆCN23, USB Port 4/5 ÆCN23A
If you want to use a USB Keyboard, you must enable the USB keyboard support function
in BIOS's Integrated Peripherals menu (See Section 3.4). This board contains a USB Host
controller and a root hub with two connectors is included for an optional USB Adaptor
(USB 2/3 and 4/5).

Chapter 2
16
CN24 (Front Audio Connector)
This connector gives you the option of a front-panel audio jack cable ext. to be plugged
into a special custom-designed system case.
Simply remove the two jumper caps at pin [5-6] and [9-10] then plug it into the (optional)
cable ext. connector. Pin [5-6] and [9-10] are shorted (default) to enable the back-panel
audio function.
JP2/3 (CPU Front Side Bus setting)
This cap setups up the CPU Ext. Clock Frequency. This function allows you to set the
CPU’s FSB. The default setting is at pin [1-2], and your CPU’s FSB will be automatically
detected.
It is recommended that you leave the default settings to prevent any burnout
on your CPU.
JP2 JP3 Definition
2-3 1-2 100 MHz
1-2 1-2 133 MHz
1-2 2-3 166 MHz
2-3 2-3 200 MHz