VIA Technologies VIA KT266A ChipsetMotherboard User manual

VIA KT266A Chipset
Motherboard
USER’S MANUAL
AMD Duron/Athlon Socket A CPU

VIA KT266A Chipset Motherboard
SupportingAMDSocketADuron/Athlon/AthlonXPSeriesProcessors
100/133 MHz Front Side Bus Frequency
AGP 4X
VIA®KT266A Chipset
Welcome!
Congratulationsonyourpurchaseofthisgreatvaluemotherboardwithitsrangeofspecialfeatures
andinnovativeonboardfunctionsbuiltaroundtheadvancedarchitectureofthenewVIA®KT266A
Chipset. More details will follow later in this manual.
Your User’s Manual
ThisUser’sManualisdesignedtohelp endusersandsystemmanufacturerstosetupandinstall
themotherboard. Alloftheinformationwithinhasbeencarefullycheckedforaccuracy. However,
the manufacturer is not responsible or liable for any errors or inaccuracies, which this manual
may contain. This includes references to products and software. In addition, the information
and specifications are subject to change without prior notice.
Disclaimer
This manual is provided “as is” without any warranty of any kind, either expressed or implied,
including, but not limited to, conditions of merchantability or fitness for a particular purpose.
Trademarks
Allbrands,productnames, and trademarksmentionedinthisdocument arethepropertyoftheir
respective owners or companies and are used solely for identification or explanation.
Copyright
Thismanualmaynot,inwholeorinpart,bephotocopied,reproduced,transcribed,translated,or
transmittedinany formorlanguagewithouttheprior writtenconsentofthemanufacturer, except
forcopiesretainedbythepurchaserforpersonalarchivingpurposes.
ManualVersion: 1.0
Release Date: December 2001

BIOS Upgrading Utility and Motherboard
Shield
BIOS Upgrading Utility—One Click is All it Takes!
We are proud to inform you that your new motherboard comes with a BIOS upgrading and
motherboard protection utility.This BIOS updating program makes BIOS updating easy, and
enhances the security and stability of systems built with your motherboard.
BIOS Upgrading Utility Features:
•Anti-VirusBIOSProtection–Thismotherboardcomeswithanewhardwaremonitoring
functionthat can prevent any unauthorized BIOSupdating caused by viruses. Only
this BIOS upgrading utility can update the BIOS for this motherboard.
•BIOSUpdatingConfidence – Beyond preventing viruses, the BIOS upgrading utility
allowsBIOSupdatingwithconfidence. Inthepast,anyfailureorincorrectoperation
during BIOS updating could crash the whole system. Normally the user wouldn’t
havethecapabilitytoretrieveand reestablish the system, they could only return the
computer to the supplier for costly, time-consuming repairs. With the enhanced
security of this BIOS upgrading utility, users of this motherboard can completely
avoid these problems. No matter what happens during BIOS updating, the user’s
system can still boot from the floppy drive, allowing the updating command to be
executedagain.
•One-Click, Online BIOS Updating – For users of Windows 9X/Me/2000/XP/NT 4.0,
theBIOSupgradingutilityallowsyoutouseaninnovativeonlineupdatingtechnology.
Just one click can detect the BIOS version of your system, download the latest
version, and execute all the updating commands automatically from the Internet.
Restartingthe computer completes the BIOS updating. This featureshould be very
handy for users who need to update BIOS repeatedly, especially MIS staff. The
onlineBIOSupdatingprogramisincludedonthe driversCD-ROMincludedinthebox
withyourmotherboard. Followingthestep-by-stepinstructions,youcaneasily update
or backup your BIOS. (If you have a different OS, see “Chapter 4 BIOS Upgrade”
for your BIOS updating procedure.)
•LinearOverclocking – the BIOS upgrading utility also provides a linear overclocking
function. Users can fine-tune the Front Side Bus (FSB) by increasing or reducing it
by as little as 1.0MHz to find the optimum FSB setting for the system. Should the
FSBbesettoohigh, thesystemcanbereturnedto the defaultsettingbypressingthe
“INS” key.

TableofContents
CHAPTER 1 INTRODUCTION 1
1.1 EssentialHandlingPrecautions.......................................................................... 1
1.2 Checklist: Hardware Required for Setup........................................................... 2
1.3 PackageContents ............................................................................................. 3
1.4 SpecificationsandFeatures............................................................................... 3
CHAPTER 2 HARDWARE INSTALLATION 5
2.1 VIAKT266AChipsetMotherboard..................................................................... 5
2.2 LayoutofVIAKT266AChipsetMotherboard...................................................... 6
2.3 CPUInstallation ................................................................................................. 7
2.4 100/133MHz SystemConfiguration .................................................................... 8
2.5 ClearCMOSJumper ......................................................................................... 9
2.6 SuspendToRAMSetting ................................................................................... 9
2.7 Keyboard Wake Up............................................................................................ 9
2.8 MemoryConfiguration...................................................................................... 10
2.9 Primary/SecondaryIDEConnectors................................................................. 11
2.10 FloppyDiskDriveConnector ........................................................................... 12
2.11 FanPowerConnectors .................................................................................... 12
2.12 Wake-on-LANConnector ................................................................................. 13
2.13 Wake-on-ModemConnector ............................................................................ 13
2.14 IrDA-CompliantInfraredModule Connector ...................................................... 14
2.15 PowerConnector ............................................................................................. 14
2.16 PanelConnectors ............................................................................................ 15
2.17 InternalAudioConnectors ................................................................................ 16
2.18 ExternalBack Panel I/OPorts .......................................................................... 17
2.19 InternalUSBPortConnectors........................................................................... 18

CHAPTER 3 BIOS SETUP 20
3.1 BIOS Setup........................................................................................................20
3.2 The MainMenu ..................................................................................................20
3.3 Standard CMOS Features .................................................................................22
3.4 Advanced BIOS Features ..................................................................................25
3.5 Advanced Chipset Features ...............................................................................28
3.6 IntegratedPeripherals........................................................................................33
3.7 Power Management Setup.................................................................................38
3.8 PnP/PCI Configuration Setup .............................................................................42
3.9 PC Health Status................................................................................................44
3.10 Frequency/Voltage Control.................................................................................45
3.11 Load Fail-Safe Defaults .....................................................................................46
3.12 LoadOptimized Defaults....................................................................................47
3.13 SupervisorPassword.........................................................................................47
3.14 User Password ..................................................................................................48
3.15 Save & Exit Setup ..............................................................................................49
3.16 ExitWithoutSaving ............................................................................................49
CHAPTER 4 BIOS UPGRADE 50
4.1 How to Upgrade Your Motherboard BIOS..........................................................50

1INTRODUCTION
CHAPTER 1 INTRODUCTION
1.1 Essential Handling Precautions
IMPORTANT. Read this section before unpacking your motherboard!
••
••
•Power Supply
Becareful! Alwaysensurethatthecomputerisdisconnected from the powersupply
when working on the motherboard and its components. On the motherboard are 2
LEDs. One is green and indicates that the power connector is attached and the
system is in Standby, with 5V of power active to the motherboard. The other is red
and indicates that the system is in Suspend Mode. Serious damage could occur if
you remove or install any components when the green LED is lit; while additionally,
you could experience a nasty shock if you touch anything inside the case when the
red LED is lit.
•Static Electricity
Static electricity may cause damage to the delicate integrated circuit chips on your
motherboard. Before handling the motherboard outside of its protective packaging,
ensure that there is no static electric charge in your body. A static discharge strong
enough to damage computer components is not perceptible by a human. Observe
theseprecautionswhilehandlingthemotherboard and other computercomponents:
1. If possible, wear an anti-static wrist strap connected to a natural earth ground.
2. Touch a grounded or anti-static surface, or a metal fixture such as a pipe or the
chassis of your system, before touching the motherboard.
3. When you have removed the motherboard from its anti-static packaging, try to
hold it only by the edges, without touching any components.
4. Avoid contacting the components on add-on cards, motherboards, and modules
with the gold-colored connectors which plug into the expansion slots.
5. Handle system components only by their mounting brackets.
6. Keep components which are not connected to the system in their anti-static
packagingwheneverpossible.

1.2 Checklist: Hardware Required for Setup
Itisadvisabletohavealloftheseitemsofhardwareavailablebeforeyouunpackyourmotherboard
from its anti-static packaging and start building your system.
−−
−−
−Computer case and chassis with appropriate power supply
−−
−−
−Monitor
−−
−−
−Socket A Central Processing Unit (CPU) and CPU fan
−−
−−
−DIMM memory module(s)
−−
−−
−PS/2 or USB Keyboard
−−
−−
−PS/2 or USB Mouse
−−
−−
−HardDiskDrive
−−
−−
−Floppy Disk Drive
−−
−−
−CD-ROMDrive
−−
−−
−(Optional) External Peripherals: printer, speakers, plotter, modem
−−
−−
−(Optional) Internal Peripherals: modem, LAN cards
INTRODUCTION 2
••
••
•Battery Replacement
The battery which holds the system settings memory (CMOS RAM) on your
motherboard should not require replacement for at least five years, and probably
much longer. In picture 2.1, it is located near the lower edge of the motherboard.
Incorrectcomputertimeand/orlossoftimemay indicateaweakmotherboard battery.
Pleasereplaceyourbatteryonlywiththesametype,orasimilartype recommended
by the battery manufacturer. If the battery is replaced incorrectly, there is a risk of
ashortcircuitorexplosion. Usedbatteriesshould be disposed ofinaccordancewith
themanufacturer’s instructions andlocalenvironmentalregulations.

3INTRODUCTION
1.3 Package Contents
Thismotherboardpackage should contain the following items. Please check them as soonas
you unpack. If you find any damaged or missing items, please contact your retailer.
−−
−−
−VIAKT266AChipsetmotherboard
−−
−−
−1 x CD-ROM
−−
−−
−1 x FDD cable
−−
−−
−1 x Ultra DMA/66/100 cable
−−
−−
−User’sManual
1.4 Specifications and Features
••
••
•CPU
−−
−−
−SupportsAMDDuron/Athlon/AthlonXP,SocketACPUs
••
••
•Chipset
−−
−−
−North Bridge: VIA KT266A
− −
− −
− South Bridge: VIA VT8233/VT8233A
••
••
•DRAMMemory
−−
−−
−Supports DDR Memory
−−
−−
−3 x 184pin DIMM module slots onboard
−−
−−
−8MB~3GB memory capacity
−−
−−
−8/16/32/64/128/256/512MB DDR DRAM
−−
−−
−64 data bits structure only
−−
−−
−PC1600/PC2100DDRDRAM
••
••
•I/O BUS Slot
−−
−−
−1 x AGP slot
−−
−−
−5 x Master/Slave PCI slots (PCI 2.2 compliant)
••
••
•I/O Functions
−−
−−
−Supports PIO Mode 3, 4 ATAPI devices and Ultra DMA 33/66/100/133 EIDE
(Only VT8233A South Bridge supports Ultra DMA 133)
−−
−−
−Supports 2 high speed UART 16550 COM ports

INTRODUCTION 4
− −
− −
− Supports 1 SPP/EPP/ECP LPT port
− −
− −
− Supports 2 1.44/2.88 MB floppy disk drive(s)
−−
−−
−Supports PS/2 Mouse and PS/2 Keyboard
−−
−−
−Supports 1 IrDA port
−−
−−
−Supports 6 Universal Serial Bus (USB) ports(VIA VT8233A South Bridge only
supports 4 USB ports)
−−
−−
−Supports Line-out, Line-in, and MIC-in jacks.
−−
−−
−Supports 1 Game/MIDI port
•Build-in AC97 CODEC
−−
−−
−AC97 2.1 Compliant
•Award BIOS
−−
−−
−Supports Plug and Play, PC99
−−
−−
−Supports ACPI, APM, DMI and Green Features
•Wakeup Features
−−
−−
−SupportsWake-on-LANfunction
−−
−−
−RemoteRingWakeup
−−
−−
−TimeWakeup
• Other Features
−−
−−
−Year 2000 compliant
−−
−−
−Anti-VirusBootup
−−
−−
−System voltage monitors for CPU Vcore, VDDQ, +3.3V, +5V, +12V, -12V, -5V,
VBAT(V) and 5VSB(V)
−−
−−
−CPUtemperaturemonitor
−−
−−
−System temperature monitor
−−
−−
−FANspeedmonitors
•PCB Dimensions
−−
−−
−ATX form factor, 4-layer PCB, 22 cm x 30.5 cm (8.5 in. x 12 in.)

CHAPTER 2 HARDWARE INSTALLATION
2.1 VIA KT266A Chipset Motherboard
5HARDWARE INSTALLATION
WOL Header
Wake-on-LAN
·
USB Connectors
·
4 x USB Ports
AC97 CODEC
·
AC97 Audio CODEC
FDD Connector
Memory
3 x 184pin DIMM Sockets
·
8MB~3GB DDR
·
I/O Port
·
·
2 x USB Ports
·
2x COM Ports & 1 x Parallel Port
·
PS/2 KB Port & PS/2 Mouse Port
GAME/MIDI Port & Audio Jacks
(Line-In, Line-Out, MIC-In)
IrDA
WOM Header
·
Wake-on-Modem
Flash EEPROM
·
Award BIOS
PnP, DMI
ACPI compliant
·
·
South Brid
g
e
Power LED
Green: Standb
y
·
LPC Super I/O
·
Winbond 83627SF
CPU
·
AMD Duron/Athlon/
Athlon XP Socket A CPU
Audio Connectors
Expansion Slots
··
5 x PCI Slots
··
1 x AGP Slot
PCI IDE Connectors
DMA Mode 2
·
Bus Master
·
·
PIO Mode 3/4
·
·
Ultra DMA 33/66/100/
133(VT8233A onl
y
)
·
North Brid
g
e
VIA KT266A
·
VIA KT8233/8233A
·

2.2 Layout of VIA KT266A Chipset Motherboard
HARDWARE INSTALLATION 6
Panel Connectors
PS/2
T:Mouse
B:Ke
y
board
Game+Audio
South
Brid
g
e
PGA 462
North
Brid
g
e
KB MOUSE
USB
T:USB2
B:USB1
COMA
CD1
MODEM
WOLWOM
AGP Slot
PCI Slot 1
PCI Slot 2
PCI Slot 3
PCI Slot 4
PCI Slot 5
Lithium
Batter
y
IDE1 IDE2
DIMM1 (184pin DDR Module)
DIMM2 (184pin DDR Module)
DIMM3 (184pin DDR Module)
CPU-FAN
AUX
VIDEO
IRDA
JUSB1
SW3
SYS-FAN1
JP1
CD2
JUSB2
(
VT8233 onl
y)
Power Connector
FDD
SYS-FAN2
COMB
PRN
STBY-LED
T:Top
B:Bottom
JP5
JP4
MEM-LED

2.3 CPU (Central Processing Unit) Installation
Allthispointyoushouldbefamiliarwiththehandlingprecautions;checkedthatyouhaveallofthe
necessary hardware for building your system; inspected the motherboard package contents
and,lookedat thelayoutofthe motherboard. Thischapterwilltake youstep-by-stepthroughthe
process of installing the different hardware devices onto your new motherboard.
7 HARDWARE INSTALLATION
ThemotherboardhasaZIFSocket462tohousetheCPU. ACPUfanisnecessarytoprevent
overheating. Ifnofanhas beensuppliedwiththeCPU,purchase andinstallonebeforeyou turn
on your system.
Warning! CPUs generate tremendous heat while operating. Make sure to install
a CPU fan with enough heat-dissipation grease to completely cover the CPU die
before powering up the computer. Never run the processor without the heatsink
properly and firmly attached.
PERMANENT DAMAGE COULD RESULT!
Caution!
1. Remember to always make sure the system power is off before installing or
removing any devices. Check the Power Indicator LEDs on the motherboard
as shown in Figure 2.2 and described in Section 1.1.
2. Don’t forget the static electricity precautions. (See Section 1.1.)
3. Be careful! Incorrectly inserting hardware onto your motherboard can
permanently damage the motherboard.
Please follow the steps below to install the CPU:
Step 1:
To install the CPU, first turn off your system and remove its cover. Locate the ZIF socket and
open it by first pulling the lever sideways away from the socket then upwards at a 90-degree
rightangle. InserttheCPUinthecorrectdirection,smeartheheat-dissipationgreaseoverthe
CPUdie,thenput aCPUfanonto coverthefaceoftheCPU. With theaddedweightofthe CPU

fan,noforceisrequiredtoinserttheCPUintothesocket. Oncecompletelyinserted, close the
socket’s lever while holding down the CPU. This locks the CPU into the socket.
Step 2:
Connect the CPU fan’s cable to the CPU-FAN connector indicated on the diagram below.
Ensure that the cable is connected correctly! It will be obvious which way it must fit.
HARDWARE INSTALLATION 8
Socket 462 CPU Installation
Socket
462 CPU
(Top View)
Notch
CPU-FAN
Socket
462 CPU
(
Bottom View
)
Notch

2.5 Clear CMOS Jumper (3-pin JP1)
To clear the CMOS data, you should turn off your computer’s power and put Jumper JP1 in
the Clear position as shown below for at least 10 seconds. Return the jumper to NORMAL
and reboot.
Clear
Normal
1
1
(Default)
Clear CMOS Jumper
CMOS
1
JP1
2.4 100/133 MHz System Configuration
SW3 allows you to set the FSB (Front Side Bus) for 100 or 133MHz Configuration. Please
leave the SW3 setting as “133”if you want to adjust the FSB Clock from BIOS. (Please
refer Section 3.10 Frequency/Voltage Control on page 46).
100/133 MHz FSB Configuration Jumper
O: ON
X: OFF
SW3
SW3
100
133
12
o
xx
o
(Default)
9 HARDWARE INSTALLATION

HARDWARE INSTALLATION 10
2.6 Suspend To RAM Setting (3-Pin JP4)
To use the STR Function, turn off system power and short pin 2 and 3 of JP4. Reboot the
system and enter BIOS Setup to turn on STR. Please left the Jumper setting at “STR_OFF”,
then you can select the ACPI Suspend Type only through BIOS Menu. Please refer to section
“3.7 Power Management Setup”for detail.(The future version will fix the setting on-board, and
remove JP4).
Suspend To RAM Settin
g
Jumper
STR_OFF
SOFT_OFF
1
1
1
JP4
(Default)
2.7 Keyboard Wake UP (3-pin KB-AWK)
This function or enables you to use the keyboard to power up the system. Set this jumper to
“Enable”ifyouwish to use your keyboard to power up your computer.
Ke
y
board Wake Up
Enable
Disable
1
1
1
JP5
(Default)

11 HARDWARE INSTALLATION
2.8 Memory Configuration
ThismotherboardmustbeinstalledwithDIMMs(DualInlineMemoryModules). TheDIMMsmust
be 2.5V DDR DRAM modules. The VIA KT266 chipset supports PC1600 and PC2100 DDR
DIMMs. You can install memory in any combination as follows:
184pin DIMM
DDR DRAM 8,16, 32, 64,128, 256, 512 MB and1GB
DDR DRAM 8,16, 32, 64,128, 256, 512 MB and1GB
DDR DRAM 8,16, 32, 64,128, 256, 512 MB and1GB
3 GB (max.)
184Pin DDR DIMM Sockets
184Pin DDR DRAM Module (DIMM1)
184Pin DDR DRAM Module (DIMM2)
184Pin DDR DRAM Module (DIMM3)
NOTE: Different types of DRAM modules (eg. DDR200 and DDR266) should not
be installed on one motherboard at the same time.
DIMMLocation
DIMM1
DIMM2
DIMM3
TotalMemory

HARDWARE INSTALLATION 12
2.9 Primary/Secondary IDE Connectors (Two 40-pin IDE)
Thismotherboardsupportstwo40-pinIDEconnectors marked as IDE1 (primary IDE channel)
and IDE2(secondaryIDEchannel). EachchannelsupportstwoIDEdevices,foratotal of four
devices. ConnectyourHardDiskDrive(HDD)(themain one if you are usingmorethanone)to
the “Master”connector (at the end of the cable) and connect it to IDE1 (see important note
below). IfyourHDDsupportsUltraDMA/66/100,youmustusean80-wirecable,otherwisethe
HDDwon’tbeabletoreachthis speed. If you intend to operatetwoIDEdevicesfromthesame
channel,onedevicemustbe set to“Master”mode,theotherto“Slave”mode. Harddiskdrives,
CD ROM drives and other IDE devices can be set as either “master”or “slave”, depending on
the device’s jumper settings. Please refer to the device’s user manual for more information.
IDE Connectors
Note: Orient the red stripe to PIN1
Primary IDE Connector
Secondary IDE Connector
IDE1
IDE2
PIN1
PIN1
NOTE: The connectors must be attached properly to the IDE channels. Ensure
that the red stripe on one edge of the ribbon cable (this may be faint and
could also be a dotted line) is the closest to PIN1 (on the left with the
motherboard as oriented in the picture below).

13 HARDWARE INSTALLATION
2.10 Floppy Disk Drive Connector (34-pin FDC)
Thisconnectorsupportstheprovided floppydiskdriveribboncable. Afterconnectingthe single
plug end of this cable to the motherboard, connect the two plugs on the other end to the floppy
disk drive(s).
Floppy Disk Drive Connector
Note: Orient the red stripe to PIN1
Flopp
y
Drive Connector
PIN1
2.11 Fan Power Connectors
There are three fan power connectors on the motherboard: CPU-FAN, SYS-FAN1, and SYS-
FAN2. Each connector provides +12V power. Make sure the power cables are connected in
the right direction or damage may occur. These connectors support cooling fans of 500 mA
(6W) or less.
Fan Power Connectors
Rotation
+12V
GND
SYS-FAN2
SYS-FAN1 Rotation
+12V
GND
CPU-FAN Rotation
+12V
GND

2.12 Wake-on-LAN Connector (3-pin WOL)
Thisconnectorconnects toLANcardswithaWake-on-LANoutput. The systemcanbepowered
up when a wakeup packet or signal is received from the LAN card.
Wake-On-LAN Connector
WOL +5 Volt Standby
GND
PME
HARDWARE INSTALLATION 14
Wake-On-Modem Connector
WOM
+5 Volt Standby
GND
RI-
2.13 Wake-on-Modem Connector (3-pin WOM)
This connector allows the system to be powered up upon receipt of a call via the modem.
NOTE: Thisfunctionrequiresthe“Ring/WOL Resume”functioninPowerManagement
Setup-IRQ/Event Activity Detect to be “Enabled”and that your system
have an ATX power supply with at least 720mA +5V standby power.
NOTE: This function requires a modem which supports the Ring Wake-Up
function, the “Ring/WOL Resume”functioninPower Management Setup-
IRQ/Event Activity Detect to be “Enabled”, and your system to have an
ATX power supply with at least 720MA+5V standby power.

2.14 IrDA-Compliant Infrared Module Connector (10-pin IrDA)
TheIrDAconnectorcanbeconfiguredtosupportawirelessinfraredmodule. Withthismodule
andapplicationsoftwaresuchasLaplinkorWin95DirectCableConnection,theusercantransfer
files to or from laptops (notebooks), PDAs, and printers. You must also configure the setting
through “UART Mode Select”in “Integrated Peripherals-SuperIO Device”in BIOS to select
“IrDA”.
IrDA Connector
IrDA
910
+5V
IRRX
GND
IRTX
CIRRX
5VSB
15 HARDWARE INSTALLATION
2.15 Power Connector (20-pin PWR-CONN)
Make sure to plug the ATX power supply connector in the right direction. The pin definition is
shownbelow. MakesurethatyourATX powersupplycansupportatleast720mAonstandby.
Power Connector
PSON# : Power Supply on
Power Connector
+3.3V
-12.0V
GND
PSON#
GND GND GND
-5.0V
+5.0V +5.0V
Power Good +3.3V +3.3V
GND
+5.0V
GND
+5.0V GND
+5.0V Standby
+12.0V