Asus A7N8X-VM 400 User manual

Motherboard
A7N8X-VM/400
User Guide

ii
Checklist
Copyright © 2005 ASUSTeK COMPUTER INC. All Rights Reserved.
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 FORA PARTICULAR PURPOSE.
IN NO EVENT SHALLASUS, 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 MANUALARE FURNISHED
FOR INFORMATIONAL USE ONLY, ANDARE SUBJECT TO CHANGEATANY TIME
WITHOUT NOTICE,AND SHOULD NOT BE CONSTRUED AS ACOMMITMENT BYASUS.
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.
E1857
Revised edition V2
February 2005

iii
Features
Contents
Notices ............................................................................................v
Safety information ..........................................................................vi
About this guide............................................................................. vii
A7N8X-VM/400 specification summary........................................ viii
Chapter 1: Product introduction
1.1 Welcome! ........................................................................... 1-2
1.2 Package contents............................................................... 1-2
1.3 Special features.................................................................. 1-2
1.4 Motherboard components .................................................. 1-4
1.5 Motherboard layout ............................................................ 1-7
1.6 Motherboard installation ..................................................... 1-8
1.6.1 Placement direction ............................................... 1-8
1.6.2 Screw holes ........................................................... 1-8
1.7 Before you proceed ............................................................ 1-9
1.8 Central Processing Unit (CPU)......................................... 1-10
1.9 System memory ................................................................1-11
1.10 Expansion slots ................................................................ 1-12
1.10.1 Configuring an expansion card ............................ 1-12
1.10.2 Standard Interrupt Assignments .......................... 1-12
1.10.3 AGP slot............................................................... 1-13
1.10.4 PCI slots .............................................................. 1-13
1.11 Jumpers............................................................................ 1-14
1.12 Connectors ....................................................................... 1-16
Chapter 2: BIOS information
2.1 Managing and updating your BIOS .................................... 2-2
2.1.1 Creating a bootable floppy disk ............................. 2-2
2.1.2 Using AFUDOS to copy the current BIOS ............. 2-3
2.1.3 Using AFUDOS to update the BIOS ...................... 2-4
2.1.4 Using ASUS EZ Flash to update the BIOS ............ 2-5
2.1.5 ASUS Update ........................................................ 2-6
2.2 BIOS Setup program .......................................................... 2-8
2.2.1 BIOS menu bar ...................................................... 2-8
2.2.2 Legend bar............................................................. 2-9

iv
Contents
2.3 Main menu........................................................................ 2-10
2.3.1 Primary and Secondary IDE Master/Slave ...........2-11
2.3.2 System Information .............................................. 2-12
2.4 Advanced menu ............................................................... 2-13
2.4.1 Chipset................................................................. 2-13
2.4.2 Onboard Devices Configuration........................... 2-14
2.4.3 PCIPnP ................................................................ 2-16
2.5 Power menu ..................................................................... 2-18
2.5.1 Power Up Control ................................................ 2-18
2.5.2 Hardware Monitor ................................................ 2-20
2.6 Boot menu ........................................................................ 2-21
2.6.1 Boot Settings Configuration ................................. 2-21
2.6.2 Security ................................................................ 2-23
2.7 Exit menu ......................................................................... 2-25
Chapter 3: Software support
3.1 Installing an operating system............................................ 3-2
3.2 Support CD information...................................................... 3-2
3.2.1 Running the support CD ........................................ 3-2
3.2.2 Drivers menu ......................................................... 3-3
3.2.3 Utilities ................................................................... 3-4
3.2.4 ASUS contact information...................................... 3-5

v
Notices
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, 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.
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.
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.

vi
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.

vii
Conventions used in this guide
To make sure that you perform certain tasks properly, take note of the
following symbols used throughout this guide.
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. Refer to the ASUS contact
information.
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.
About this guide
WARNING: 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.

viii
A7N8X-VM/400 s ecifications summary
(continued next page)
SocketAforAMDAthlon™XP 2700 MHz+ processors
NVIDIA
®
nForce2 IGP North bridge
NVIDIA
®
nForce2 MCP South bridge
400/333/266 MHz
2 x 184-pin DDR DIMM sockets support up to maximum 2 GB
unbuffered PC2700/2100 non-ECC DDR SDRAM memory.
Dual-channel memory architecture
3 x PCI
1 x AGP 8X (1.5V only)
2 x UltraDMA133
Integrated GeForce4 MX GPU
Supports DVI (AGP-NV-DVI) and TV-out (AV/S) cards
Realtek ALC650 6-channel audio CODEC
S/PDIF in/out interface
Realtek 8201BL 10/100 Mbps LAN PHY
Super I/O integrated monitoring of CPU/chassis fan rotation
and MB/CPU temperature
1 x Parallel
1 x Serial (COM1)
1 x PS/2 Keyboard
1 x PS/2 Mouse
1 x RJ45 port
1 x Audio I/O
1 x VGA port
4 x USB 2.0/1.1
1 x USB connector supports additional 2 USB 2.0 ports
CPU/chassis FAN connectors
Chassis intrusion connector
20-pin ATX power connector
PANEL connector
CD/AUX connectors
S/PDIF in/out connector
GAME/MIDI connector
TV-out connector
Serial (COM2) connector
Front panel audio connector
CPU
Chipset
Front Side Bus
Memory
Expansion slots
Storage
Graphics
Audio
LAN
Hardware monitoring
Rear panel ports
Internal connectors

ix
BIOS features
Industry standard
Manageability
Support CD contents
Accessories
Form Factor
* Specifications are subject to change without notice.
4 Mb Flash ROM, AMI BIOS, ACPI, DMI2.0, WfM2.0, Green,
PnP, TCAV, SMBIOS 2.3 ASUS EZ Flash, ASUS MyLogo2
PCI 2.2, USB 2.0
DMI 2.0, WOL by PME, WOR by PME,
WO_USB, WO_KB/MS
Device drivers
ASUS PC Probe
ASUS Update
ASUS Screen Saver
Adobe Acrobat Reader
Anti-Virus Utility
ASUS A7N8X-VM/400 series support CD
UltraDMA133 cable
FDD cable
I/O shield
User guide
Micro-ATX form factor: 9.6 in x 9.6 in
A7N8X-VM/400 s ecifications summary

Cha ter 1
This chapter describes the features of the
motherboard. It includes brief descriptions of the
motherboard components, and illustrations of the
layout, jumper settings, and connectors.
Product introduction

1-2 Chapter 1: Product introduction
1.1 Welcome!
Thank you for buying the ASUS
®
A7N8X-VM/400 motherboard!
The ASUS A7N8X-VM/400 motherboard comes with the most advanced
technologies to deliver maximum performance for Socket A processors. This
motherboard is packed with value-added features for guaranteed consumer
satisfaction. The following sections provide important technical information about
the motherboard for future upgrades or system reconfiguration.
Before you start installing the motherboard and hardware devices on it, check the
items in your package with the list below.
1.2 Package contents
Check your ASUS A7N8X-VM/400 package for the following items.
ASUS A7N8X-VM/400 motherboard
Micro-ATX form factor: 9.6 in x 9.6 in
ASUS A7N8X-VM/400 series support CD
40-pin 80-conductor ribbon cable for UltraDMA133 IDE drives
Ribbon cable for a 3.5-inch floppy drive
Bag of extra jumper caps
I/O shield
User guide
1.3 S ecial features
400 MHz FSB support
The motherboard comes with a Socket 462 that supports the latest 400 MHz FSB
AMD Athlon XP™processor. This feature is guaranteed to give you a powerful and
efficient computer platform.
Dual-channel DDR memory support
With the 128-bit Twinbank DDR memory architecture, the motherboard doubles the
DDR333 bandwidth thus eliminating system bottlenecks. The motherboard is
capable of performing at peak bandwidth of up to 5.4 GB/s assuring you of fast,
reliable computing solution. See details on page 1-11.

ASUS A7N8X-VM/400 motherboard user guide 1-3
AGP 8X support
AGP 8X (AGP 3.0) is the next generation VGA interface specification that enables
enhanced graphics performance with high bandwidth speeds of up to 2.12 GB/s.
See details on page 1-13.
Integrated GeForce4 MX GPU
This motherboard is equipped with an integrated GeForce MX GPU, a
second-generation mainstream graphics processing unit designed to deliver the
best graphics experience with its high texture content and scene complexity
capabilities. See details on page 2-13.
ASUS MyLogo2
The ASUS MyLogo2 allows you to personalize and add style to your system with
customizable boot logos. See pages 2-22 and 3-5 for details.
ASUS C.O.P.
The ASUS C.O.P. (CPU Overheating Protection) is a hardware protection circuit
that automatically shuts down the system power before temperatures go high
enough to permanently damage the CPU.
ASUS EZ Flash
With the ASUS EZ Flash, you can easily update the system BIOS even before
loading the operating system. No need to use a DOS-based utility or boot from a
floppy disk. See details on page 2-5.
Digital video output support
The DVO interface feature of this motherboard allows you to enjoy simultaneous
digital display and TV output with the separately purchasedASUS AGP-NV-DVI
and ASUS AV/S TV-out cards. See details on pages 1-13, 1-20, and 2-14.

1-4 Chapter 1: Product introduction
1.4 Motherboard com onents
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.
34 72 6
13
10
5
14
9 811
12
1
15
25
18
19
20
21
17
16
23 22
24

ASUS A7N8X-VM/400 motherboard user guide 1-5
1
2
3
4
5
6
7
8
9
10
11
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.
ATX power connector. This standard 20-pin connector connects to an
ATX 12V power supply. The power supply must have at least 1Aon the
+5V standby lead (+5VSB).
CPU socket. This is a Zero Insertion Force (ZIF) socket for AMDAthlon
XP™processors.
Northbridge controller. The NVIDIA
®
nForce2™IGP Northbridge
controller chip supports a 64/128-bit DDR memory controller and up to
2GB of 333/266/200MHz DDR memory. The Northbridge controller is
equipped with a maximum 128 MB integrated graphics UMA share memory
for the onboard VGA.
DDR DIMM sockets. Two Double Data Rate Dual Inline Memory Module
(DDR DIMM) sockets are available for up to 2 GB of DDR SDRAM. This
memory technology supplies data transfer rates up to 5.4 GB/s for
333MHz DDR SDRAM.
IDE connectors. These dual-channel bus master IDE connectors support
up to four UltraDMA133, PIO Modes 0-4 IDE devices. Both the primary
(blue) and secondary (black) connectors are slotted to prevent incorrect
insertion of the IDE cable.
Floppy disk connector. This connector is for the provided FDD cable for
the floppy disk drive. One side of the connector is slotted to prevent
incorrect insertion of the FDD cable.
Flash ROM. This 4 Mb LPC chip contains the programmable BIOS program.
Super I/O chipset. ITE IT8712F-A offers support for a variety of I/O
functions. Provides two high-speed UART compatible serial ports, and a
parallel port with EPP and ECP capabilities. The Super I/O controller
supports a floppy disk drive, PS/2 keyboard, and PS/2 mouse.
Southbridge controller. This motherboard comes with the brand new
NVIDIA
®
nForce2™MCP integrated peripheral Southbridge controller. This
controller communicates at 800 MB/s with the Northbridge chip for
maximum bandwith required to support PCI, USB, and Fast Ethernet
devices. The controller also supports standard UltraDMA133 and has
separate data paths for each IDE channel.
AGP slot. The Accelerated Graphics Port (AGP) slot supports 1.5 V
AGP 8X/4X mode graphics cards for 3D graphics applications. The AGP
slot also supports digital visual interface (DVI) cards for digital display on
LCD monitors and projectors.

1-6 Chapter 1: Product introduction
Audio CODEC. The Realtek ALC650 6-channelAudio CODEC is
AC’97-compliant onboard audio solution for PC multimedia systems.
PCI slots. These 32-bit PCI 2.2 expansion slots support bus master PCI
cards like SCSI and LAN cards.
LAN controller. The Realtek 8201BL LAN PHY Fast Ethernet controller
allows connection to a Local Area Network (LAN) through a network hub.
PS/2 mouse port. This green 6-pin connector is for a PS/2 mouse.
Parallel port. This 25-pin port connects a parallel printer or a scanner.
LAN (RJ-45) port. Using the NVMAC
®
in the Southbridge controller and
the Realtek 8201BL LAN PHY, this port allows connection to a Local Area
Network (LAN) through a network hub.
Line In port (light blue). This port connects a tape player or other audio
sources.
Line Out port (lime). This port connects a headphone or a speaker.
Microphone port (pink). This port connects a microphone.
USB 1 & 2 ports. These two 4-pin Universal Serial Bus 2.0/1.1 ports are
available for connecting USB devices such as mouse or PDA.
VGA port. This 15-pin VGA port connects a VGA monitor.
Serial port (COM1). This port connects a serial mouse or other serial
devices.
USB 3 & 4 ports. These two 4-pin Universal Serial Bus 2.0/1.1 ports are
available for connecting USB devices such as mouse or PDA.
PS/2 keyboard port. This purple 6-pin connector is for a PS/2 keyboard.
15
16
17
18
19
20
21
22
23
24
25
12
14
13

ASUS A7N8X-VM/400 motherboard user guide 1-7
1.5 Motherboard layout
24.5cm (9.64in)
PRI_IDE
FLOPPY1
A7N8X-VM
Accelerated Graphics Port (AGP8X1)
nVidia
nForce2
IGP
ATX Power Connector
Super
I/O
4Mb
BIOS
PCI 1
PS/2
T: Mouse
B: Keyboard
Realtek
RTL8201
U46
CHA_FAN
Audio
Codec
Below:Mic In
Center:Line Out
Top:Line In
DDR DIMM2 (64/128 bit, 184-pin module)
2 3
DDR DIMM3 (64/128 bit, 184-pin module)
4 5
PCI 2
PCI 3
Socket 462
24.5cm (9.64in)
CPU_FAN1
COM1
PARALLEL PORT
VGA
RJ-45
Top:
USB1
USB2
Bottom:
SEC_IDE
CLRTC1
USBPW56
USB56
CD1 AUX1
SPDIF1
FPAUDIO
CR2032 3V
Lithium Cell
CMOS Power
COM2
PANEL1
CHASSIS1
GAME1
nVidia
MCP
USBPW34
PWR_LED1
USBPW12
USB3
USB4

1-8 Chapter 1: Product introduction
1.6 Motherboard installation
This motherboard uses the Micro ATX form factor.
1.6.1 Placement direction
When installing the motherboard, make sure that you place it into the chassis in
the correct orientation. The edge with the external ports goes to the rear part of the
chassis as indicated in the image below.
1.6.2 Screw holes
Place eight (8) screws into the holes indicated by circles to secure the
motherboard to the chassis.
Place this side
towards the rear
of the chassis
Do not overtighten the screws! Doing so may damage the
motherboard.
Unplug the power cord before installing the motherboard. Failure to do
so may cause you physical injury and damage to motherboard
components.

ASUS A7N8X-VM/400 motherboard user guide 1-9
1.7 Before you roceed
Take note of the following precautions before you install motherboard components
or change any motherboard settings.
A7N8X-VM
A7N8X-VM/400 Onboard LED
SB_PWR1
ON
Standby
Power
OFF
Powered
Off
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. Avoid touching the ICs on components.
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.
Onboard LED
The motherboard comes with a standby power LED. The green LED lights up to
indicate that the system is ON, in sleep mode, or in soft-off mode. This is a
reminder that you should shut down the system and unplug the power cable before
removing or plugging in any motherboard component. The illustration below shows
the location of the onboard LED.

1-10 Chapter 1: Product introduction
1.8 Central Processing Unit (CPU)
The motherboard comes with a Socket A (462) that supports Athlon™XP
processors with “QuantiSpeed”data processing, large data caches, 3D
enhancements and 400/333/266 MHz bus speeds. AMD Athlon™XP processors
offer gigahertz speeds to support all the latest computing platforms and
applications.
Each AMD CPU has a “marked”corner. This corner is usually indicated with a notch,
and/or a golden square or triangle. Refer to this indicator while orienting the CPU.
A fan and heatsink should be attached to the CPU to prevent overheating.
A7N8X-VM
A7N8X-VM/400 Socket 462
AMD™CPU
CPU NOTCH
LOCK
CPU NOTCH
TO INNER
CORNER
LEVER
This motherboard does not support Athlon™, Duron™, and other AMD
processors with less than 1 GHz core speed.
Installing the CPU
Follow these steps to install a CPU:
1. Locate the CPU socket, open it by pulling
the lever sideways, then lift the lever
upwards to an angle of 90 ~ 100 degrees.
2. Insert the CPU with the correct orientation.
The notched or golden corner of the CPU
must be oriented toward the inner corner of
the socket base nearest to the lever hinge.
The CPU should drop easily into place. Do not force the CPU into the
socket to avoid bending the pins. If the CPU does not fit, check its
alignment and look for bent pins.
Gold triangle