Asus A7A266 User manual

®
A7A266
DDR SDRAM
266MHz FSB AGP Pro/4X
Socket A Motherboard
USER’S MANUAL

ASUS A7A266 User’s Manual
2
USER'S NOTICE
Product Name: ASUS A7A266
Manual Revision: 1.04 E828
Release Date: August 2001
No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form
or by any means, except documentation kept by the purchaser for backup purposes, without the
express written permission of ASUSTeK COMPUTER INC. (“ASUS”).
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EI-
THER EXPRESS OR IMPLIED, INCLUDING BUT NOTLIMITED TO THE IMPLIED WAR-
RANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FORAPARTICULAR
PURPOSE. IN NO EVENT SHALLASUS, ITS DIRECTORS, OFFICERS, EMPLOYEES OR
AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUEN-
TIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS, LOSS OF BUSINESS,
LOSS OF USE OR DATA, INTERRUPTION OF BUSINESSANDTHE LIKE), EVEN IFASUS
HAS BEENADVISED OF THE POSSIBILITY OF SUCH DAMAGESARISING FROMANY
DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.
Product warranty or service will not be extended if: (1) the product is repaired, modified or al-
tered, unless such repair, modification of alteration is authorized in writing by ASUS; or (2) the
serial number of the product is defaced or missing.
Products and corporate names appearing in this manual may or may not be registered trademarks
or copyrights of their respective companies, and are used only for identification or explanation
and to the owners’ benefit, without intent to infringe.
• AMD, Athlon™ are trademarks of Advanced Micro Devices, Inc.
• VIAis a trademark of VIATechnologies, Inc.
• Windows and MS-DOS are registered trademarks of Microsoft Corporation.
• Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated.
• Trend and ChipAwayVirus are trademarks of Trend Micro, Inc.
• Other company and product names may be trademarks or registered trademarks of the respective
companies with which they are associated.
The product name and revision number are both printed on the product itself. Manual revisions
are released for each product design represented by the digit before and after the period of the
manual revision number. Manual updates are represented by the third digit in the manual revision
number.
For previous or updated manuals, BIOS, drivers, or product release information, contact ASUS at
http://www.asus.com.tw or through any of the means indicated on the following page.
SPECIFICATIONSANDINFORMATIONCONTAINED INTHIS MANUALAREFURNISHED
FORINFORMATIONALUSEONLY,ANDARE SUBJECTTOCHANGEATANYTIMEWITH-
OUTNOTICE,AND SHOULD NOTBECONSTRUEDASACOMMITMENTBYASUS.ASUS
ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURA-
CIES THAT MAYAPPEAR IN THIS MANUAL, INCLUDING THE PRODUCTSAND SOFT-
WARE DESCRIBED IN IT.
Copyright © 2001ASUSTeK COMPUTER INC. All Rights Reserved.

ASUS A7A266 User’s Manual 3
ASUS CONTACT INFORMATION
ASUSTeK COMPUTER INC. (Asia-Pacific)
Marketing
Address: 150 Li-Te Road, Peitou, Taipei, Taiwan 112
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support
MB/Others (Tel): [phone] (English)
Notebook (Tel): [phone] (English)
Desktop/Server (Tel):[phone] (English)
Fax: [phone]
Email: [email protected]
WWW: www.asus.com.tw
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER INTERNATIONAL (America)
Marketing
Address: 6737 Mowry Avenue, Mowry Business Center, Building 2
Newark, CA 94560, USA
Fax: [phone]
Email: [email protected]
Technical Support
Fax: [phone]
Email: [email protected]
WWW: www.asus.com
FTP: ftp.asus.com/Pub/ASUS
ASUS COMPUTER GmbH (Europe)
Marketing
Address: Harkortstr. 25, 40880 Ratingen, BRD, Germany
Fax: [phone]
Email: [email protected] (for marketing requests only)
Technical Support
Hotline: MB/Others: [phone] Notebook:[phone]
Fax: [phone]
Support (Email): www.asuscom.de/de/support (for online support)
WWW: www.asuscom.de
FTP: ftp.asuscom.de/pub/ASUSCOM

ASUS A7A266 User’s Manual
4
CONTENTS
1. INTRODUCTION 7
1.1 How This Manual Is Organized ................................................... 7
1.2 Item Checklist .............................................................................. 7
2. FEATURES 8
2.1 The ASUS A7A266 ...................................................................... 8
2.1.1 Specifications ..................................................................... 8
2.1.2 Optional Components......................................................... 9
2.1.3 Special Features................................................................ 10
2.1.4 Performance Features ....................................................... 10
2.1.5 Intelligence ....................................................................... 11
2.2 Motherboard Components.......................................................... 12
2.2.1 Component Locations....................................................... 13
3. HARDWARE SETUP 14
3.1 Motherboard Layout .................................................................. 14
3.2 Layout Contents ......................................................................... 15
3.3 Getting Started ........................................................................... 17
3.4 Motherboard Settings ................................................................. 18
3.5 System Memory ......................................................................... 24
3.5.1 DDR DIMM Support........................................................ 24
3.5.2 SDR DIMM Support ........................................................ 25
3.5.3 General DIMM Notes....................................................... 25
3.5.4 Memory Installation ......................................................... 26
3.6 Central Processing Unit (CPU) .................................................. 27
3.7 Expansion Cards ........................................................................ 28
3.7.1 Expansion Card Installation Procedure ............................ 28
3.7.2 Assigning IRQs for Expansion Cards .............................. 29
3.7.3 Accelerated Graphics Port Pro (AGP Pro) ....................... 30
3.7.4 Audio Modem Riser (AMR) Slot ..................................... 31
3.8 Connectors ................................................................................. 33
3.9 Starting Up the First Time.......................................................... 45
4. BIOS SETUP 47
4.1 Managing and Updating Your BIOS .......................................... 47
4.1.1 Upon First Use of the Computer System.......................... 47
4.1.2 Updating BIOS Procedures .............................................. 48
4.2 BIOS Setup Program.................................................................. 51
4.2.1 BIOS Menu Bar................................................................ 52

ASUS A7A266 User’s Manual 5
CONTENTS
4.2.2 Legend Bar ....................................................................... 52
4.3 Main Menu ................................................................................. 54
4.3.1 Primary & Secondary Master/Slave ................................. 55
4.3.2 Keyboard Features............................................................ 58
4.4 Advanced Menu ......................................................................... 60
4.4.1 Chip Configuration........................................................... 63
4.4.2 I/O Device Configuration ................................................. 65
4.4.3 PCI Configuration ............................................................ 67
4.5 Power Menu ............................................................................... 69
4.5.1 Power Up Control............................................................. 71
4.5.2 Hardware Monitor ............................................................ 73
4.6 Boot Menu ................................................................................. 74
4.7 Exit Menu................................................................................... 76
5. SOFTWARE SETUP 79
5.1 Install Operating System............................................................ 79
5.2 Start Windows ............................................................................ 79
5.3 A7A266 Series Motherboard Support CD................................... 80
6. SOFTWARE REFERENCE 81
6.1 ASUS PC Probe ......................................................................... 81
6.2 CyberLink PowerPlayer SE ....................................................... 86
6.3 CyberLink VideoLive Mail ........................................................ 87
6.4 ASUS Live Update..................................................................... 89
6.5 Multi-Channel Audio Feature Setup .......................................... 90
7. APPENDIX 93
7.1 Glossary ..................................................................................... 93
INDEX 97

ASUS A7A266 User’s Manual
6
FCC & DOC COMPLIANCE
FederalCommunications CommissionStatement
This device complies with FCC Rules Part 15. Operation is subject to the following
two conditions:
• This device may not cause harmful interference, and
• 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 installa-
tion. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with manufacturer's instructions, 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 interfer-
ence by one or more of the following measures:
• Re-orient 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.
WARNING! Any changes or modifications to this product not expressly ap-
proved by the manufacturer could void any assurances of safety or performance
and could result in violation of Part 15 of the FCC Rules.
Reprinted from the Code of Federal Regulations #47, part 15.193, 1993. Washington DC: Office of the
Federal Register, National Archives and Records Administration, U.S. Government Printing Office.
CanadianDepartment ofCommunications Statement
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus set out in the Radio Interference Regulations of the Canadian
Department of Communications.
This Class B digital apparatus complies with Canadian ICES-003.
CetappareilnumériquedelaclasseBestconformeàlanormeNMB-003duCanada.

ASUS A7A266 User’s Manual 7
1.1 How This Manual Is Organized
This manual is divided into the following sections:
1. INTRODUCTION Manual information and checklist
2. FEATURES Production information and specifications
3. HARDWARE SETUP Instructions on setting up the motherboard.
4. BIOS SETUP Instructions on setting up the BIOS
5. SOFTWARE SETUP Instructions on setting up the included software
6. SOFTWARE REFERENCE Reference material for the included software
7. APPENDIX Optional items and general reference
1.2 Item Checklist
Check that your package is complete. If you discover damaged or missing items,
contact your retailer.
1. INTRODUCTION
1. INTRODUCTION
Manual / Checklist
Package Contents
(1) ASUS Motherboard
(1) 40-pin 80-conductor ribbon
cable for internal UltraDMA/
100 / UltraDMA/66 (also
compatible with UltraDMA/33
IDE drives/devices)
(1) Ribbon cable for internal
UltraDMA/33 IDE drives
(1) Ribbon cable for one 5.25”and
two 3.5”floppy disk drives
(1) ASUS 2-port USB Connector Set
(1) Bag of spare jumper caps
(1) ASUS Support CD with drivers
and utilities
(1) This Motherboard User’s
Manual
Optional Items
ASUSCIDBchassis intrusiondetec-
tion module
ASUS IrDA-compliant infrared
module
ASUS MR-I Modem Riser Card

8ASUS A7A266 User’s Manual
2.1 The ASUS A7A266
The ASUS A7A266 motherboard is carefully designed for the value-conscious PC
user who wants advanced features processed by the fastest processors.
2.1.1 Specifications
•AMD
®
Athlon™/ Duron™Processor Support: SupportsAMD’s new socket-
A Palomino™/ Thunderbird™processor cores.
•North Bridge System Chipset:ALi M1647™chipset with AGP/PCI/Memory
controllersupportsa133/100MHzFront SideBus (FSB),supports DDRSDRAM
DIMM, complies with AGP 2.0 specifications for 4X, 2X and 1X AGP modes
and PCI 2.2. bus interface. It is optimized to deliver enhanced AMD Athlon™
processor system performance.
•South Bridge System PCIset: ALi M1535D+™PCIset with PCI Super-I/O In-
tegrated Peripheral Controller (PSIPC) with support for UltraDMA/100, which
allows burst mode data transfer rates of up to 100MB/sec; AC97 audio; USB
controller with root hub and four function ports.
•PC2100 / PC1600 DDR and PC133 SDR SDRAM Support: Equipped with
two Double Data Rate Dual Inline Memory Module (DDR DIMM) sockets to
support up to 2GB of DDR SDRAM and three SDR DIMM sockets to support
up to 3GBof SDR SDRAM. DDR SDRAM is the newest memory standard with
the highest bandwidth and lowest latency currently available and dramatically
improves the memory system’s ability to service, among others, high multimedia
requirements. (Caution: Do not use DDR & SDRAM modules simultaneously.)
•Stepless Frequency Selection:Allows CPU external (FSB) frequency settings
to be set in 1MHz-increments or reduction.
•JumperFree™Mode:Allows processor settings and easy overclocking of fre-
quency and Vcore voltage all through BIOS setup when JumperFree™mode is
enabled. Easy-to-use DIP switches instead of jumpers are included to allow
manual adjustment of the processor’s external frequency.
•AGPPro Slot: SupportsAGP/AGP Pro cards for high performance, component
level interconnection targeted at 3D graphical applications supporting 133MHz
4X mode.
•UltraDMA/100 Support: Comes with an onboard PCI Bus Master IDE con-
troller with two connectors that support four IDE devices on two channels. Sup-
ports UltraDMA/100, UltraDMA/66, UltraDMA/33, PIO Modes 3 & 4 and Bus
Master IDE DMA Mode 2, and Enhanced IDE devices, such as DVD-ROM,
CD-ROM, CD-R/RW, LS-120, and Tape Backup drives.
•Wake-On-LAN Connector: Supports Wake-On-LAN activity through an
optional PCI Fast Ethernet card.
•Wake-On-Ring Connector: Supports Wake-On-Ring activity through a PCI
modem card that supports a Wake-On-Ring connector.
2. FEATURES
Specifications
2. FEATURES

ASUS A7A266 User’s Manual 9
2. FEATURES
2. FEATURES
Specifications
•USB: Supports up to six USB ports, two on the back panel and four midboard,
for more peripheral connectivity options.
•OneTouchManagement:Supports an optionalASUS iPanel, an easy to access
box with system information LED display, front I/O ports, and space reserved
for a hard disk drive. With an ASUS iPanel, you can monitor your computer
system’s vital components.
•PC Health Monitoring: Provides an easy way to examine and manage system
status information, such as CPU and systerm voltages, temperatures, and fan
status through the onboard hardware ASUS ASIC and the bundled ASUS PC
Probe.
•SMBus:Features the System Management Bus interface, which is used to physi-
cally transport commands and information between SMBus devices.
•PCI/AMR Expansion Slots: Provides five 32-bit PCI (Rev. 2.2) expansion
slots, which can support Bus Master PCI cards, such as SCSI or LAN cards (PCI
supports up to 133MB/s maximum throughput), and one Audio Modem Riser
(AMR) slot (shared), which supports a very affordable audio and/or modem
riser card.
•Super Multi-I/O: Provides two high-speed UART compatible serial ports and
one parallel port with EPP and ECP capabilities.
•Enhanced ACPI & Anti-Boot Virus Protection: Programmable BIOS (Flash
EEPROM), offering enhanced ACPI for Windows 982000/Millenium
compatibility, built-infirmware-basedvirus protection,and autodetectionofmost
devices for virtually automatic setup.
•Concurrent PCI: Concurrent PCI allows multiple PCI transfers from PCI mas-
ter busses to the memory and processor.
•Smart BIOS: 2Mb firmware provides Vcore and CPU/SDRAM frequency ad-
justments, boot block write protection, and HD/SCSI/MO/ZIP/CD/Floppy boot
selection.
•Integrated Infrared (IrDA) Support: Integrated IR supports an optional re-
mote control package for wireless interfacing with external peripherals, per-
sonal gadgets, or an optional remote controller.
•Desktop Management Interface (DMI): Supports DMI through BIOS, which
allows hardware to communicate within a standard protocol creating a higher
level of compatibility. (Requires DMI-enabled components.)
•Color-coded Connectors: To enhance user accessibility to system components
and to meet PC 99 compliancy, major connectors in this motherboard are color-
coded.
2.1.2 Optional Components
•Onboard Audio: C-Media Audio Chip CMI8738 supporting the latest PCI 6
channel and HRTF 3D Audio sound circuitry.

10 ASUS A7A266 User’s Manual
2. FEATURES
Performance
2. FEATURES
2.1.3 Special Features
•ACPI Ready: Advanced Configuration Power Interface (ACPI) provides more
Energy Saving Features for operating systems that support OS Direct Power
Management (OSPM) functionality. With these features implemented in the OS,
PCs can be ready around the clock, yet satisfy all the energy saving standards.
To fully utilize the benefits of ACPI, an ACPI-supported OS, such as Windows
98/2000/Millenium must be used.
•Easy Installation: Incorporates BIOS that supports autodetection of hard disk
drives, PS/2 mouse, and Plug and Play devices to make the setup of hard disk
drives, expansion cards, and other devices virtually automatic.
•NewCompliancy:Both the BIOS and hardware levels of this motherboard meet
the stringent requirements for PC 99 certification. The new PC 99 requirements
for systems and components are based on the following high-level goals: Sup-
port for Plug and Play compatibility and power management for configuring
and managing all system components, and 32-bit device drivers and installation
proceduresforWindows95/98/NT. Color-codedconnectorsand descriptiveicons
make identification easy as required by PC 99.
2.1.4 Performance Features
•High-Speed Data Transfer Interface: IDE transfers using UltraDMA/33 Bus
Master IDE can handle rates up to 33MB/s. This motherboard with its chipset
and support for UltraDMA/100 increases the data transfer rate to 100MB/s.
UltraDMA/100 is backward compatible with DMA/66, DMA/33, and DMA and
with existing DMA devices and systems so there is no need to upgrade current
EIDE/IDE drives and host systems. (UltraDMA100/66 require a 40-pin 80-con-
ductor cable to be enabled.)
•DDR SDRAM Optimized Performance: This motherboard supports a new gen-
eration memory, Double Data Rate (DDR) Dynamic Random Access Memory
(SDRAM), whichiscompatibletotheindustrystandardSDRAM.Thisnewmemory
technology increases performance by executing two actions per clock cycle,
resulting in data transfer rates of up to 2.1 GB/s for 133MHz DDR SDRAM and
1.6GB/s for 100MHz DDR SDRAM.

ASUS A7A266 User’s Manual 11
2. FEATURES
2. FEATURES
Intelligence
2.1.5 Intelligence
•Dual Function Power Button: Pushing the power button for less than 4 sec-
onds when the system is in the working state places the system into one of two
states: sleep mode or soft-off mode, depending on the BIOS or OS setting (see
PWR Button < 4 Secs in 4.5 Power Menu). When the power button is pressed
for more than 4 seconds, the system enters the soft-off mode regardless of the
BIOS setting.
•Fan Status Monitoring and Alarm: To prevent system overheat and system
damage, the CPU, power supply, and system fans can be monitored for RPM
and failure. All fans are set for its normal RPM range and alarm thresholds.
•Message LED (requiresACPI OS support): Turbo LEDs now act as informa-
tion providers. Through the way a particular LED illuminates, the user can de-
termine if there are messages waiting in the mailbox.Asimple glimpse provides
useful information to the user.
•Remote Ring On (requires modem): This allows a computer to be turned on
remotely through an internal or external modem. With this benefit on-hand, users
can access vital information from their computers from anywhere in the world!
•System Resources Alert: Today’s operating systems such as Windows 98/
Millenium and Windows NT/2000, require much more memory and hard drive
space to present enormous user interfaces and run large applications. The sys-
tem resource monitor will warn the user before the system resources are used up
to prevent possible application crashes. Suggestions will give the user informa-
tion on managing their limited resources more efficiently.
•Temperature Monitoring and Alert: CPU temperature is monitored by the
ASUS ASIC to prevent system overheat and system damage.
•Voltage Monitoring and Alert: System voltage levels are monitored to ensure
stable voltage to critical motherboard components. Voltage specifications are
more critical for future processors, so monitoring is necessary to ensure proper
system configuration and management.
•Chassis Intrusion Detection: Supports chassis-intrusion monitoring through
the ASUS ASIC. A chassis intrusion event is kept in memory on battery power
for more protection.

12 ASUS A7A266 User’s Manual
2. FEATURES
2. FEATURES
Motherboard Parts
Location
Processor Support Socket A (462) for AMDAthlon/Duron CPUs ......................... 2
(NOTE: A CPU thermal sensor is integrated on the motherboard,
located near the center of the CPU heat source, just below the
CPU socket)
DIP Switches ............................................................................ 8
Chipsets ALi M1647 system controller ................................................... 1
ALi M1535D+ PCIset ............................................................ 15
2Mbit Programmable Flash EEPROM ................................... 12
Main Memory Maximum 2GB support
3 SDR DIMM Sockets (maximum 3GB) ................................. 4
2 DDR DIMM Sockets (maximum 2GB) ................................ 3
PC2100 / PC1600 DDR and PC133 SDR memory support
Expansion Slots 5 PCI Slots .............................................................................. 19
1 Accelerated Graphics Port (AGP) Pro Slot ......................... 20
1 Audio Modem Riser (AMR) Slot ........................ (Shared) 17
System I/O 1 Floppy Disk Drive Connector ............................................. 13
2 IDE Connectors (UltraDMA/100 Support) ........................... 7
1 Parallel Port Connector ............................................. (Top) 24
1 Serial COM1 Port Connector .............................. (Bottom) 25
1 Serial COM2 Port Connector .............................. (Bottom) 23
USB Connectors (Port 0 & Port 1) ........................................ 26
USB Header (Port 2,3 & Port 4,5).......................................... 14
1 PS/2 Mouse Connector .............................................. (Top) 27
1 PS/2 Keyboard Connector ................................... (Bottom) 27
1 ASUS IrDA/iPanel Connector................................. (Right) 9
1 ASUS IR Connector .................................................. (Left) 9
1 ASUS iPanel Audio Connector............................................ 21
Audio PCI Audio Chipset (optional) ................................................. 18
1 Game/MIDI Connector (on audio model only) ......... (Top) 22
1 Line Out Connector (on audio model only) ........ (Bottom) 22
1 Line In Connector (on audio model only) ........... (Bottom) 22
1 Microphone Connector (on audio model only) ... (Bottom) 22
Network Features Wake-On-LAN Connector...................................................... 16
Wake-On-Ring Connector ...................................................... 11
Hardware Monitoring ASUS ASIC ............................................................................ 10
3 Fan Power and Speed Monitoring Connectors
Power ATX Power Supply Connector ................................................. 5
Special Feature Onboard LED ........................................................................... 6
Form Factor ATX
2.2 Motherboard Components
See opposite page for locations.

ASUS A7A266 User’s Manual 13
2. FEATURES
2. FEATURES
Motherboard Parts
3
25
22
26
8
21
24
19
12
1 4 5
18
11
20
7
23
27
2
10 9
17
13141516
6
9
2.2.1 Component Locations

14 ASUS A7A266 User’s Manual
3. HARDWARE SETUP
3.1 Motherboard Layout
Motherboard Layout
3. H/W SETUP
Grayed components are available only on certain models at the time of purchase.
24.5cm (9.64in)
30.5cm (12.0in)
Primary IDE
Secondary IDE
PANEL
PCI 2
SMB
FLOPPY
A7A266
ALi
M1535D+
Chipset
ASUS
ASIC
with Hardware
Monitor
PCI 1
Accelerated Graphics Port (AGP Pro)
ALi
M1647
Chipset
Flash EEPROM
(Programable BIOS)
CR2032 3V
Lithium Cell
CMOS Power
PCI 4
PCI 3
PCI 5
GAME_AUDIO
Mic
In
Line
Out
Line
In
AUX
MODEM
CD1
LED
JEN
COM1
PARALLEL PORT
COM2
DIP Switches
VID
AFPANEL
Socket 462
DIMM Socket 1 (64/72-bit, 168-pin module)
01
DIMM Socket 2 (64/72-bit, 168-pin module)
23
01
DDR DIMM1 (64/72 bit, 184-pin module)
0 1
01
DDR DIMM2 (64/72 bit, 184-pin module)
2 3
C-Media
CMI-8738
USB1
CHASIS
IDELED
USB2
AUDIO_PANEL
MIC2
Audio Modem Riser
(AMR)
PS/2
T: Mouse
B: Keyboard
USB1
USB2
ATX Power Connector
DIMM Socket 3 (64/72-bit, 168-pin module)
45
CPU_FAN
PWR_FAN
CHA_FAN
WOR
WOL_CON
CLRTC
JTPWR
DSW
BCS1
BCS2
IR

ASUS A7A266 User’s Manual 15
3. HARDWARE SETUP
3.2 Layout Contents
Motherboard Settings
1) JEN p. 19 JumperFree Mode (JumperFree/Jumper Mode)
2) VID p. 20 Voltage Regulator Output Setting (Enable/Disable)
3) DSW Switch 5 p. 20 DDR / SDR Memory Selection (Off/On)
4) DSW Switches 1–4 p. 21 CPU External Frequency Setting
5) DSW Switches 5-10 p. 22 Manual CPU Ratio Setting
6) BCS1, BCS2 p. 23 Bass Center Setting
Expansion Slots/Sockets
1) System Memory p. 24 System Memory Support
2) DDR1/DDR2 p. 24 DDR DIMM Memory Module Support
3) DIMM1/2/3 p. 25 SDR DIMM Memory Module Support
4) Socket 462 (Socket A) p. 27 CPU Support
5) PCI1/2/3/4/5 p. 28 32-bit PCI Bus Expansion Slots
6) AGP PRO p. 30 Accelerated Graphics Port (AGP) Pro
7) AMR p. 31 Audio Modem Riser (AMR) Slot
Connectors
1) PS2KBMS p. 33 PS/2 Mouse Porv #onnector (6 pin female)
2) PS2KBMS p. 33 PS/2 Keyboard Port Connector (6 pin female)
3) USB p. 34 Universal Serial Bus Connectors 0 & 1 (Two 4-pin female)
4) COM1/COM2 p. 34 Serial Port Connector (9-pin male)
5) PRINTER p. 34 Parallel Port Connector (25-pin female)
6) GAME_AUDIO p. 35 Game/MIDI Connector (15-pin female) (optional)
7) GAME_AUDIO p. 35 Audio Port Connectors (Three 1/8”) (optional)
8) FLOPPY p. 35 Floppy Disk Drive Connector (34 pin)
9) PRIMARY IDE p. 36 IDE Connectors (Two 40-1 pin)
SECONDARY IDE
10) IDELED p. 37 IDE Activity LED (2 pin)
11) CHASSIS p. 37 Chassis Intrusion Lead (4-1 pin)
12) WOL_CON p. 38 Wake-On-LAN Connector (3 pin)
13) WOR p. 38 Wake-On-Ring Connector (2 pin)
14) CHA_FAN p. 39 Chassis, Power Supply, CPU Fan Connectors (3 pin)
PWR_FAN
CPU_FAN
15) USB1/USB2 p. 40 USB Headers (Two 10-1 pin)
Layout Contents
3. H/W SETUP
continued...

16 ASUS A7A266 User’s Manual
3. HARDWARE SETUP
Layout Contents
3. H/W SETUP
16) SMB p. 40 SMBus Connector (5-1 pin)
17) IrDA/AFPANEL p. 41 ASUS IrDA/iPanel Connector (24-1 pin)
18) AAPANEL p. 41 ASUS iPanel Audio Connector (12-1 pin)
19) CD1, AUX, MODEM p. 42 Internal Audio Connector (4 pin)
20) MIC2 p. 42 Internal Microphone Connector (3 pin)
21)
PLED ( PANEL ) p. 43 System Power LED Lead (3 pin)
22) KEYLOCK (PANEL) p. 43 Keyboard Lock Switch Lead (2 pin)
23) SPEAKER (PANEL) p. 43 System Warning Speaker Connector (4 pin)
24) MLED (PANEL) p. 43 System Message LED (2 pin)
25) SMI (PANEL) p. 43 System Management Interrupt Lead (2 pin)
26) PWRBTN (PANEL) p. 43 ATX / Soft-Off Switch Lead (2 pin)
27) RESET (PANEL) p. 43 Reset Switch Lead (2 pin)
28) ATXPWR p. 44 ATX Power Supply Connector (20 pin)
29) JTPWR p. 44 Thermal Sensor Connector (2 pin)

ASUS A7A266 User’s Manual 17
3. HARDWARE SETUP
3. H/W SETUP
Getting Started
3.3 Getting Started
Before using your computer, you must complete the following steps:
1. Check Motherboard Settings
2. Install Memory Modules
3. Install the Central Processing Unit (CPU)
4. Install Expansion Cards
5. Connect Ribbon Cables, Panel Wires, and Power Supply
6. Setup the BIOS Software

18 ASUS A7A266 User’s Manual
3. HARDWARE SETUP
3.4 Motherboard Settings
This section explains in detail how to change your motherboard’s function settings
through the use of switches and/or jumpers.
A7A266 Onboard LED
0 10 1
A7A266
ON OFF
Standby
Power Powered
Off
3. H/W SETUP
Motherboard Settings
WARNING! Computer motherboards and expansion cards contain very delicate
Integrated Circuit (IC) chips. To protect them against damage from static electric-
ity, you should follow some precautions whenever you work on your computer.
1. Unplug your computer when working on the inside.
2. Use a grounded wrist strap before handling computer components. If you do
not have one, touch both of your hands to a safely grounded object or to a
metal object, such as the power supply case.
3. Hold components by the edges and try not to touch the IC chips, leads or
connectors, or other components.
4. Place components on a grounded antistatic pad or on the bag that came with
the component whenever the components are separated from the system.
5. Ensure that the ATX power supply is switched off before you plug in or
remove the ATX power connector on the motherboard.
WARNING! Make sure that you unplug your power supply when adding or re-
moving system components. Failure to do so may cause severe damage to your
motherboard, peripherals, and/or components. The onboard LED when lit acts as
a reminder that the system is in suspend or soft-off mode and not powered OFF.

ASUS A7A266 User’s Manual 19
3. HARDWARE SETUP
3. H/W SETUP
Motherboard Settings
1) JumperFree™Mode (JEN)
This jumper allows you to enable or disable the JumperFree™mode. The
JumperFree™mode allows processor settings to be made through the BIOS
setup (see 4.4Advanced Menu). The default setting is for JumperFree mode: all
DSWs come set to the OFF position and the JEN jumpers are set to [2-3].
Setting JEN
JumperFree [2-3] (default)
Jumper Mode [1-2]
A7A266 Jumper Mode Setting
JEN
0 10 1
A7A266
OFF (Default)
DSW
Jumper Free (Default)
23
Jumper Mode
12
ON
234
11 5 678 9 10
Motherboard Features Settings (DIP Switches - DSW)
The motherboard’s onboard functions are adjusted through the DIP switches. The
white block represents the switch’s position. The example below shows all the
switches in the OFF position.
0 10 1
A7A266
A7A266 DIP Switch
1-10: Frequency Multiples
DSW
ON 234
OFF ON
11 5 678 9 10

20 ASUS A7A266 User’s Manual
3. HARDWARE SETUP
3. H/W SETUP
Motherboard Settings
3) DDR / SDR Memory Selection (DSW Switch 5)
DSW switch 5 is OFF, for auto-detecting all settings using DDR RAM or
SDRAM memory.
DSW switch 5 is ON, for all settings using SDRAM memory.
0 10 1
A7A266
A7A266 DDR/SDR DIMM Selection
ON
12345678910
ON
12345678910
Auto-Detect
(Default) SDRAM
DSW
OFF ON
2) Voltage Regulator Output Setting (VID)
This jumper allows you to manually adjust the CPU core voltage. It is better to
use the CPU Default for the CPU core voltage. CPU Default means the Vcore
is generated according to the CPU VID configuration. Disabling the Voltage
regulator output allows higher voltage settings to be made; however care must
be exercised not to damage the CPU.
0 10 1
A7A266
A7A266 VID Selection
Enable
(Default)
VID
Disable
23
12