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”).
Product warranty or service will not be extended if: (1) the product is repaired, modified or
altered, unless such repair, modification of alteration is authorized in writing by ASUS; or (2)
the serial number of the product is defaced or missing.
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE
LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
(INCLUDING DAMAGES FOR LOSS OF PROFITS, LOSS OF BUSINESS, LOSS OF USE
OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE), EVEN IF ASUS HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY DEFECT OR
ERROR IN THIS MANUAL OR PRODUCT.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED
FOR INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME
WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS.
ASUS ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR
INACCURACIES THAT MAY APPEAR IN THIS MANUAL, INCLUDING THE PRODUCTS
AND SOFTWARE DESCRIBED IN IT.
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.
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 installation. 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
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 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.
v
Safety information
Electrical safety
•To prevent electrical shock hazard, disconnect the power cable from
the electrical outlet before relocating the system.
•When adding or removing devices to or from the system, ensure that
the power cables for the devices are unplugged before the signal
cables are connected. If possible, disconnect all power cables from the
existing system before you add a device.
•Before connecting or removing signal cables from the motherboard,
ensure that all power cables are unplugged.
•Seek professional assistance before using an adpater or extension
cord. These devices could interrupt the grounding circuit.
•Make sure that your power supply is set to the correct voltage in your
area. If you are not sure about the voltage of the electrical outlet you
are using, contact your local power company.
•If the power supply is broken, do not try to fix it by yourself. Contact a
qualified service technician or your retailer.
Operation safety
•Before installing the motherboard and adding devices on it, carefully
read all the manuals that came with the package.
•Before using the product, make sure all cables are correctly connected
and the power cables are not damaged. If you detect any damage,
contact your dealer immediately.
•To avoid short circuits, keep paper clips, screws, and staples away from
connectors, slots, sockets and circuitry.
•Avoid dust, humidity, and temperature extremes. Do not place the
product in any area where it may become wet.
•Place the product on a stable surface.
•If you encounter technical problems with the product, contact a
qualified service technician or your retailer.
vi
About this guide
Conventions used in this guide
To make sure that you perform certain tasks properly, take note of the
following symbols used throughout this manual.
WARNING/DANGER: Information to prevent injury to yourself
when trying to complete a task.
CAUTION: Information to prevent damage to the components
when trying to complete a task.
IMPORTANT: Information that you MUST follow to complete a
task.
NOTE: Tips and additional information to aid in completing a task.
Where to find more information
Refer to the following sources for additional information and for product
and software updates.
1.ASUS Websites
The ASUS websites worldwide provide updated information on ASUS
hardware and software products. The ASUS websites are listed in the
ASUS Contact Information on page viii.
2.Optional Documentation
Your product package may include optional documentation, such as
warranty flyers, that may have been added by your dealer. These
documents are not part of the standard package.
vii
ASUS contact information
ASUSTeK COMPUTER INC. (Asia-Pacific)
Address:150 Li-Te Road, Peitou, Taipei, Taiwan 112
General Tel:+886-2-2894-3447
General Fax:+886-2-2894-3449
General Email:info@asus.com.tw
Technical Support
MB/Others (Tel):+886-2-2890-7121 (English)
Notebook (Tel):+886-2-2890-7122 (English)
Desktop/Server (Tel):+886-2-2890-7123 (English)
Support Fax:+886-2-2890-7698
Support Email:tsd@asus.com.tw
Web Site:www.asus.com.tw
ASUS COMPUTER INTERNATIONAL (America)
Address:6737 Mowry Avenue, Mowry Business Center,
Building 2, Newark, CA 94560, USA
General Fax:+1-510-608-4555
General Email:tmd1@asus.com
Technical Support
Support Fax:+1-510-608-4555
General Support:+1-502-933-8713
Web Site:www.asus.com
Support Email:tsd@asus.com
ASUS COMPUTER GmbH (Germany and Austria)
Address:Harkortstr. 25, 40880 Ratingen, BRD, Germany
General Fax:+49-2102-442066
General Email:sales@asuscom.de (for marketing requests only)
Technical Support
Support Hotline:MB/Others: +49-2102-9599-0
Notebook (Tel):+49-2102-9599-10
Support Fax:+49-2102-9599-11
Support (Email):www.asuscom.de/de/support (for online support)
Web Site:www.asuscom.de
viii
A7S266-VM/U2 specifications summary
CPU
Chipset
Front Side Bus (FSB)
Memory
Expansion slots
IDE
Audio (optional)
VGA
Socket A for AMD Athlon XP/Athlon/Duron 2 GHz+
Thoroughbred core CPU ready
Northbridge: SiS 740
Southbridge: SiS 962L
266/200Mhz
2 x DDR DIMM Sockets
Max. 2 GB unbuffered PC2100/1600 non-ECC DDR SDRAM
2 x SDR DIMM Sockets
Max. 2 GB unbuffered PC133/100 non-ECC SDRAM
(Note: DDR and SDR memory cannot be used on A7S266-VM/U2 simultaneously.)
4 x PCI
2 x UltraDMA 133/100/66
C-media 4-channel CODEC
S/PDIF-out interface
Integrated 4X AGP Graphics
LAN (optional)
Special Features
Back Panel I/O Ports
Internal I/O
Connectors
SiS 962L integrated 10/100Mbps Fast Ethernet with Realtek
external PHY
Power Loss Restart
ASUS Jumperfree
SFS (Stepless Frequency Selection)
support S/PDIF out interface (on audio model only)
ASUS C.O.P. (CPU Overheating Protection)
CrashFree BIOS 2
1 x Parallel
1 x Serial
1 x VGA
1 x PS/2 Keyboard
1 x PS/2 Mouse
1 x Audio I/O, Game/MIDI (on audio model only)
2 x USB 2.0
1 x RJ-45 Port (on LAN model only)
CPU/Chassis FAN connector
20 pin ATX power connector
IDE LED connector
SIR
COM2 port
S/PDIF out connector (on audio model only)
CD/AUX audio in (on audio model only)
Front panel audio connector (on audio model only)
2 x USB 2.0 connector supports additional 4 USB 2.0 ports
(continued on the next page)
ix
A7S266-VM/U2 specifications summary
BIOS features
Industry standard
Manageability
Form Factor
Support CD contents
Accessories
* Specifications are subject to change without notice.
2Mb Flash ROM, CrashFree BIOS 2, EEPROM, ASUS
JumperFree, Award BIOS with ACPI, DMI2.0, PnP, WfM2.0,
Green, TCAV (Trend Chip Away Virus)
PCI 2.2, USB 2.0
WfM2.0, DMI2.0, WOR, WOL
Micro-ATX form factor: 9.6 in x 9.6 in (24.5 cm x 24.5 cm)
Device drivers
ASUS PC Probe
Trend Micro
ASUS LiveUpdate Utility
User’s manual
Support CD
1 x UltraDMA 133/100/66 cable
FDD cable
COM2 cable
I/O shield
tm
PC-cillin 2002 anti-virus software
x
Chapter 1
This chapter gives information about the ASUS
A7S266-VM/U2 motherboard that came with the
system.This chapter includes the motherboard
layout, jumper settings, and connector locations.
ASUS A7S266-VM/U2 Motherboard
Motherboard Info
1-1
1.1Welcome!
Thank you for buying the ASUS® A7S266-VM/U2 motherboard!
The ASUS A7S266-VM/U2 motherboard is loaded with the most advanced
technologies to deliver the maximum performance for socket A processors. This
motherboard is loaded with value-added features for guaranteed consumer
satisfaction. Unique ASUS features such as ASUS C.O.P., ASUS JumperFree, ASUS
CrashFree BIOS 2 and more are included to ensure the best user experience and
value in a motherboard. For future upgrades or system reconfiguration, this chapter
provides technical information about the motherboard.
Before you start installing the motherboard, and hardware devices on it, check the
items in your package with the list below.
1.2Package contents
Check your ASUS A7S266-VM/U2 package for the following items.
ASUS A7S266-VM/U2 motherboard
Micro-ATX form factor: 9.6 in x 9.6 in (24.5 cm x 24.5 cm)
ASUS A7S266-VM/U2 series support CD
1 pc. 80-conductor ribbon cable for UltraDMA 66/100/133 IDE drives
Ribbon cable for a 3.5-inch floppy drive
Bag of extra jumper caps
User Guide
I/O shield
1-2
1.3Motherboard components
23615
4
161819
17
Before you install the motherboard, learn about its major components and available
features to facilitate the installation and future upgrades. Refer to the succeeding
pages for the component descriptions.
15
14
13
12
10
78119
2625
ASUS A7S266-VM/U2 Motherboard
2423202122
1-3
1
CPU Sockets. Socket 462 (Socket A) Zero Insertion Force (ZIF) socket for
the AMD Athlon XP 2200+/Athlon/Duron Processors, with frequency of
2200+ or higher.
2
NorthBridge Controller. The SIS 740 NorthBridge controller supports 266
Mhz front side bus.
3
DDR DIMM Sockets. These two 184-pin DIMM sockets support up to 2GB
using non-ECC PC2100/1600 DDR DIMMs
4
SDRAM DIMM Sockets. These two 168-pin DIMM sockets support up to
2GB using non-ECC PC133/100 SDRAM DIMMs.
(Note: DDR and SDRAM memory cannot be used simultaneously)
5
IDE Connectors. These dual-channel bus master IDE connectors support
up to four Ultra DMA133/100/66, PIO Modes 3 & 4 IDE devices. Both the
primary(blue) and secondary(black) connectors are slotted to prevent
incorrect insertion of the IDE ribbon cable.
6
ATX power connector. This standard 20-pin connector connects to an
ATX 12V power supply. The power supply must have at least 1A on the
+5V standby lead (+5VSB).
7
South bridge controller. The SIS 962L integrated peripheral controller
supports various I/O functions including, dual-channel ATA133/100/66 bus
master IDE controller, up to six USB 2.0 ports, PS/2 keyboard and mouse
port, LPC Super I/O interface, AC’97 interface,10/100Mb LAN and PCI 2.2
interface..
8
9
10
11
12
13
14
Floppy Disk connector. This connector connects the provided ribbon
cable for the floppy disk drive. One side of the connector is slotted to
prevent incorrect insertion of the floppy disk cable.
Onboard LED. This onboard LED lights up if there is a standby power on
the motherboard. This LED acts as a reminder to turn off the system power
before plugging or unplugging devices.
COM2 connector. This 9-pin connector connects to COM2 port.
Flash ROM. This 2Mb firmware contains the programmable BIOS
program.
Super I/O chipset. This interface provides the commonly used Super I/O
functionality. The chipset supports a high-performance floppy disk
controller for a 360K/720K/1.44M/2.88M floppy disk drive, a multi-mode
parallel port, a game port and a serial port.
PCI slots. These 32-bit PCI 2.2 expansion slots support bus master PCI
cards like SCSI or LAN cards with 133MB/s maximum output.
Audio CODEC. The C-Media 4-channel CODEC is an AC’97 compliant
audio CODEC designed for PC multimedia systems.
(on audio model only)
1-4
Chapter 1: Motherboard Information
15
LAN PHY. The SiS 962L integrated 10/100Mbps Fast Ethernet with
Realtek external PHY allows connection to a Local Area Network (LAN)
through a network hub. (on LAN model only)
16
17
18
19
20
21
22
23
PS/2 mouse port. This green 6-pin connector is for a PS/2 mouse.
RJ-45 port. This port allows connection to a Local Area Network (LAN)
through a network hub. (on LAN model only)Parallel port. This 25-pin port connects a parallel printer, a scanner, or
other devices.
MIDI/Game port. This port allows connection to a joystick, game pad and
other musical MIDI enable musical instruments.
(on audio model only)
Microphone jack. This Mic (pink) jack connects a microphone.
(on audio model only)
Line In jack. This Line In (light blue) jack connects a tape player or other
audio sources. (on audio model only)
Line Out jack. This Line Out (lime) jack connects a headphone or a
speaker. (on audio model only)
Video port. This port connects a VGA monitor.
24
25
26
Serial port. This port connects to your serial mouse and other serial
devices.
USB 2.0 ports. These two 4-pin Universal Serial Bus 2.0 (USB 2.0) ports
are available for connecting USB devices such as a mouse and PDA.
PS/2 keyboard port. This purple 6-pin connector is for a PS/2 keyboard.
ASUS A7S266-VM/U2 Motherboard
1-5
1.4Motherboard layout
24.5cm (9.64in)
®
PS/2
T: Mouse
B: Keyboard
Bottom:
Top:
USB1
RJ-45
USB2
COM1
PARALLEL PORT
VGA
Line
Out
Line
In
Mic
In
GAME_AUDIO
Audio
Codec
Super
2Mb
BIOS
AUX1
CD1
FP_AUDIO1
I/O
USBPWR12
Socket 462
LAN
PHY
FLOPPY
COM2
PCI 1
PCI 2
PCI 3
SB_PWR1
PCI 4
CPU_FAN1
SiS
740
Chipset
A7S266-VM/U2
USB56
DIMM Socket1 (64/72 bit, 168-pin module)
DDR DIMM1 (64/72 bit, 184-pin module)
DDR DIMM2 (64/72 bit, 184-pin module)
0 1
2 3
SiS
962L
Chipset
SPDIF_OUT1
IR_CON1
USB34
USBPWR56
USBPWR34
DIMM Socket2 (64/72 bit, 168-pin module)
0 1
2 3
CR2032 3V
Lithium Cell
CMOS Power
PANEL1
ATX Power Connector
IDE2
CHA_FAN1
BUZZER
24.5cm (9.64in)
IDE1
IDE_LED1
1-6
Chapter 1: Motherboard Information
1.5Before you proceed
®
d
Take note of the following precautions before you install motherboard components
or change any motherboard settings.
1.Unplug the power cord from the wall socket before touching any
component.
2.Use a grounded wrist strap or touch a safely grounded object or to a metal
object, such as the power supply case, before handling components to
avoid damaging them due to static electricity.
3.Hold components by the edges to avoid touching the ICs on them.
4.Whenever you uninstall any component, place it on a grounded antistatic
pad or in the bag that came with the component.
5.Before you install or remove any component, ensure that the ATX
power supply is switched off or the power cord is detached from the
power supply. Failure to do so may cause severe damage to the
motherboard, peripherals, and/or components.
When lit, the green LED (SB_PWR1) indicates that the system is ON,
in sleep mode, or in soft-off mode, a reminder that you should shut
down the system and unplug the power cable before removing or
plugging in any motherboard component.
SB_PWR1
A7S266-VM/U2
A7S266-VM/U2 Onboard LED
ON
Standby
Power
OFF
Powere
Off
ASUS A7S266-VM/U2 Motherboard
1-7
1.6Motherboard installation
Before you install the motherboard, study the configuration of your chassis to
ensure that the motherboard fits into it. The motherboard uses the micro-ATX form
factor that measures 9.6 inches x 9.6 inches (24.5 cm x 24.5 cm).
Make sure to unplug the power cord before installing or removing the
motherboard. Failure to do so may cause you physical injury and damage
motherboard components.
1.6.1Placement direction
When installing the motherboard, make sure that you place it into the chassis in
the correct orientation. The edge with external ports goes to the rear part of the
chassis as indicated in the image below.
1.6.2Screw holes
Place eight (8) screws into the holes indicated by circles to secure the
motherboard to the chassis.
Do not overtighten the screws! Doing so may damage the motherboard.
Place this side towards
the rear of the chassis
1-8
Chapter 1: Motherboard Information
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