Intel CUSL2K User Manual

®

CUSL2K

Intel® 815E ATX Motherboard

USER’S MANUAL

USER'S NOTICE

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,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED T O THE IMPLIED
WARRANTIES OR CONDITIONS OF MERCHANT ABILITY 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.

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.

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.

• Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated.

• Intel, LANDesk, and Pentium are registered trademarks of Intel Corporation.

• Trend and ChipAwayVirus are trademarks of Trend Micro, Inc.

• Windows and MS-DOS are registered trademarks of Microsoft Corporation.
The product name and revision number are both printed on the product itself. Manual revi-

sions 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.

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 MA Y APPEAR IN THIS MANUAL, INCLUD­ING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.

Copyright © 2000 ASUSTeK COMPUTER INC. All Rights Reserved.

Product Name: ASUS CUSL2K
Manual Revision: 1.03 E654
Release Date: November 2000

2 ASUS CUSL2K User’s Manual

ASUS CONTACT INFORMATION

ASUSTeK COMPUTER INC. (Asia-Pacific)

Marketing

Address: 150 Li-Te Road, Peitou, Taipei, Taiwan 112
Telephone: [phone]
Fax: [phone]
Email: [e-mail]

Technical Support

MB/Others (Tel): [phone] (English)
Notebook (Tel): [phone] (English)
Desktop/Server (Tel):[phone] (English)
Fax: [phone]
Email: [e-mail]
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: [e-mail]

Technical Support

Fax: [phone]
Email: [e-mail]
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: [e-mail] (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 CUSL2K User’s Manual 3

CONTENTS

1. INTRODUCTION ............................................................................. 7

1.1 How This Manual Is Organized .................................................. 7

1.2 Item Checklist ............................................................................. 7

2. FEATURES ........................................................................................ 8

2.1 The ASUS CUSL2K ................................................................... 8

2.2 CUSL2K Motherboard Components ........................................ 12

3. HARDWARE SETUP ...................................................................... 14

3.1 CUSL2K Motherboard Layout ................................................. 14

3.2 Layout Contents ........................................................................ 15

3.3 Hardware Setup Procedure ....................................................... 17

3.4 Motherboard Settings................................................................ 17

3.5 System Memory (DIMM) ......................................................... 24

3.5.1 General DIMM Notes .................................................... 24

3.5.2 Memory Installation ...................................................... 25

3.6 Central Processing Unit (CPU) ................................................. 26

3.7 Expansion Cards ....................................................................... 27

3.7.1 Expansion Card Installation Procedure ......................... 27

3.7.2 Assigning IRQs for Expansion Cards............................ 27

3.7.3 Communication and Networking Riser (CNR) Slots .... 28

3.7.4 Accelerated Graphics Port (AGP) Slot .......................... 29

3.8 External Connectors.................................................................. 30

3.9 Starting Up the First Time ........................................................ 43

4. BIOS SETUP..................................................................................... 45

4.1 Managing and Updating Your BIOS ......................................... 45

4.1.1 Upon First Use of the Computer System....................... 45

4.1.2 Updating BIOS Procedures ........................................... 46

4.2 BIOS Setup Program ................................................................ 49

4.2.1 BIOS Menu Bar ............................................................. 50

4.2.2 Legend Bar .................................................................... 50

4.3 Main Menu................................................................................ 52

4.3.1 Primary & Secondary Master/Slave .............................. 53

4.3.2 Keyboard Features ......................................................... 56

4.4 Advanced Menu ........................................................................ 58

4.4.1 Chip Configuration ........................................................ 61

4.4.2 I/O Device Configuration .............................................. 64

4.4.3 PCI Configuration ......................................................... 66

4.4.4 Shadow Configuration................................................... 68

4 ASUS CUSL2K User’s Manual

CONTENTS

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 CUSL2K Motherboard Support CD ......................................... 80

5.4 INF Update Utility for Intel 815 Chipset .................................. 82

5.5 Intel 815 Chipset Graphic Control Driver ................................ 83

5.6 Intel LDCM Administrator Setup ............................................. 85

5.7 Intel LDCM Client Setup.......................................................... 87

5.8 ASUS BIOS Flash Utility for LDCM 6.0 ................................. 88

5.9 ASUS PC Probe Vx.xx ............................................................. 89

5.10 Install ASUS Update Vx.xx ...................................................... 90

5.11 Microsoft DirectX 6.0 Driver ................................................... 91

5.12 YAMAHA SoftSynthesizer S-YXG50...................................... 93

5.13 PC-Cillin 98 Vx.xx ................................................................... 93

5.14 Adobe Acrobat Reader Vx.x ..................................................... 94

5.15 Cyberlink Video and Audio Applications ................................. 95

5.16 Uninstalling Programs .............................................................. 96

6. SOFTWARE REFERENCE ............................................................ 99

6.1 Display Properties ..................................................................... 99

6.2 ASUS PC Probe ...................................................................... 102

6.3 ASUS LiveUpdate .................................................................. 107

6.4 YAMAHA XGPlayer .............................................................. 108

6.5 CyberLink PowerPlayer SE .................................................... 109

6.6 CyberLink PowerDVD ........................................................... 110

6.7 CyberLink V ideoLive Mail ..................................................... 111

7. APPENDIX...................................................................................... 1 13

7.1 PCI-L101 Fast Ethernet Card ................................................. 113

7.2 Glossary .................................................................................. 115

INDEX ................................................................................................. 119

ASUS CUSL2K User’s Manual 5

FCC & DOC COMPLIANCE

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:

• 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. W ashington DC: Of fice of the
Federal Register, National Archives and Records Administration, U.S. Government Printing Office.

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.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.

6 ASUS CUSL2K User’s Manual

1. INTRODUCTION

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 Intructions on setting up the motherboard.

4. BIOS SETUP Intructions on setting up the BIOS

5. SOFTWARE SETUP Intructions 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.

Manual / Checklist

1. INTRODUCTION

Package Contents

(1) ASUS Motherboard
(1) 40-pin 80-conductor ribbon cable

for internal UltraDMA100/66/33
IDE drives

(1) Ribbon cable for master and

slave IDE drives

(1) Ribbon cable for (1) 5.25” and (2)

3.5” floppy disk drives
(1) Bag of spare jumpers
(1) Support drivers and utilities
(1) This Motherboard User’s Manual
(1) ASUS 2-port USB connector set

with bracket

(1) COM2 bracket

Optional Items

USB Hub CNR card
LAN/Home PNA CNR card
AIMM card
LCD controller module
TVOUT controller module
ASUS iPanel
ASUS consumer infrared set
ASUS IrDA-compliant infrared module

ASUS CUSL2K User’s Manual 7

2.1 The ASUS CUSL2K

The ASUS CUSL2K motherboard is carefully designed for the demanding PC user
who wants advanced features processed by the fastest processors.

2.1.1 Specifications

• Latest Intel Processor Support

2. FEATURES

Specifications

• North Bridge System Chipset: The Intel® 815E chipset supports a 66/100/133

• South Bridge System Chipset: The Intel I/O Controller Hub 2 (ICH2) features

• Intel

2. FEATURES

Pentium
Celeron™ 66MHz FSB FC-PGA

Front Side Bus (FSB), up to 512MB of PC100/PC133 SDRAM, and AGP 4X
mode, which can transport twice the amount of data compared to the current
AGP standard.

support for UltraDMA/100, which allows burst mode data transfer rates of up to
100MB/sec; two USB controllers for a total of 4 USB ports; and six channel
AC97 CODEC support.

link between the ICH2 and GMCH with a bandwidth of 266MB/sec – twice the
maximum bandwidth of the PCI bus.

®

III 100/133MHz FSB FC-PGA

®

Accelerated Hub Architecture: Features a dedicated high speed hub

• PC100/PC133 Memory Support: Equipped with three Dual Inline Memory

Module (DIMM) sockets to support PC100/PC133-compliant SDRAMs (avail­able in 64, 128, 256, 512MB densities) up to 512MB.

• Integrated Graphics! The 24-bit 230MHz RAMDAC graphics controller sup-

ports 3D hyper pipelined architecture, parallel data processing and compres­sion, precise pixel interpolation, full 2D hardware acceleration, and motion video
acceleration. This integrated graphics controller can be disabled to support an

external AGP or PCI graphics card.

• AGP Slot: Comes with an Accelerated Graphics Port slot that supports AGP

cards for high performance, component level interconnect targeted at 3D graphical
applications supporting 133MHz 4X mode. Backward compatible to support
AGP 2X. This slot can also support an AGP Inline Memory Module (AIMM)
for up to 4MB of 133MHz SDRAM display cache.

• UltraDMA33/66/100 Support: Comes with an onboard PCI Bus Master IDE

controller with two connectors that support four IDE devices on two channels.
Supports 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-Up Support: Supports Wake-On-LAN and Wake-On-Ring, Keyboard

Wake-Up, and BIOS Wake-Up.

• 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.

8

ASUS CUSL2K User’s Manual

2. FEATURES

• Around-the-Clock Intrusion Detection: Chassis intrusion circuitry can log

chassis open events into LDCM. The onboard battery supports detection even
when normal power is removed and through a new design, battery drain is even
lower than the RTC used for keeping time!

• Firmware Hub: Provides security-enhancements in computer platforms by sup-

porting Random Number Generator (RNG).

• 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 or Intel LDCM software.

• CNR Support: A Communication and Networking Riser (CNR) slot provides

an interface to support very affordable multichannel audio, V.90 analog modem,
Home PNA, 10/100 Ethernet networking, USB hub, as well as future technolo­gies such as xDSL.

• PCI Expansion Slots: Provides six 32-bit PCI (PCI 2.2 compliant) expansion

slots. All PCI slots can support Bus Master PCI cards, such as SCSI or LAN
cards. (PCI supports up to 133MB/s maximum throughput.)

Specifications

2. FEATURES

• Low Pin Count (LPC) Multi-I/O: Provides two high-speed UAR T compatible

serial ports and one parallel port with EPP and ECP capabilities. UART2 can
also be directed from COM2 to the Infrared Module for wireless connections.

• Enhanced ACPI & Anti-Boot Virus Protection: Programmable BIOS (Flash

EEPROM), offering enhanced ACPI for W indows 98 compatibility , built-in firm­ware-based virus protection, and autodetection of most devices for virtually au­tomatic setup.

• Smart BIOS: The firmware hub gives a new easy-to-use interface which pro-

vides more control and protection over the motherboard. Provides Vcore and CPU/
SDRAM frequency adjustments, boot block write protection, and HD/SCSI/MO/
ZIP/CD/Floppy boot selection. Hardware random number generator supports new
security software for data protection and secured Internet transactions.

• Concurrent PCI: Concurrent PCI allows multiple PCI transfers from PCI mas-

ter busses to the memory and processor.

• Onboard LED: The onboard LED will light up when there is standby power to

the motherboard. This acts as a reminder to the user to turn OFF the power
before plugging and unplugging devices so as not to damage the motherboard,
peripherals, and/or components.

• One T ouch Management: Supports an optional ASUS 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.

• LCD/TV Output: The LCD/TV interface can support either an optional LCD

module for LCD output or a TV-out module for TV output.

• SMBus: Features the System Management Bus interface, which is used to physi-

cally transport commands and information between SMBus devices.

ASUS CUSL2K User’s Manual 9

2.1.2 Specifications–Optional Components

The following onboard components are optional at the time of purchase:

• Onboard Audio: AC97 V2.1 compliant Audio Codec with 3D sound circuitry

2.1.3 Performance

• UltraPerformance: Onboard IDE Bus Master controller with two connectors that

2. FEATURES

Performance

• High-Speed Data Transfer Interface: IDE transfers using UltraDMA/66 Bus

2. FEATURES

and sample rate conversion from 7kHz to 48kHz.

support four IDE devices in two channels. Supports UltraDMA/100, UltraDMA/
66, UltraDMA/33 (IDE DMA Mode 2), PIO Modes 3 & 4, and supports Enhanced
IDE devices, such as DVD-ROM, CD-ROM, CD-R/R W , LS-120, and T ape Backup
drives.

Master IDE can handle rates up to 66.6MB/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. (UltraDMA/66/100 requires a 40-pin 80­conductor cable to be enabled.)

• Concurrent PCI: Concurrent PCI allows multiple PCI transfers from PCI mas-

ter buses to memory and processor.

• SDRAM Optimized Performance: This motherboard supports PC133-com-

pliant Synchronous Dynamic Random Access Memory (SDRAM), which increases
the data transfer rate to 1066MB/s max.

• ACPI Ready: ACPI (Advanced Configuration and Power Interface) is also imple-

mented on all ASUS smart series motherboards. ACPI provides more Energy
Saving Features for future operating systems (OS) supporting OS Direct Power
Management (OSPM) functionality . W ith 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 W indows
98, must be used.

• Suspend and Go: Suspend-to-RAM (STR) provides maximum power savings

as an alternative to leaving the computer ON and QuickStart™ so that you do
not have to wait for a long time for system bootup.

• New Compliancy: Both the BIOS and hardware levels of the 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: sup­port for Plug and Play compatibility and power management for configuring
and managing all system components, and 32-bit device drivers and installation
procedures for W indows 95/98/NT . Color-coded connectors and descriptive icons
make identification easy as required by PC 99.

10

ASUS CUSL2K User’s Manual

2. FEATURES

2.1.4 Intelligence

• 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 the fans are set for its normal RPM range and alarm thresholds.

• T emperature Monitoring and Alert: T o prevent system overheat and system dam-

age, this motherboard supports processor thermal sensing and auto-protection.

• Voltage Monitoring and Alert: System voltage levels are monitored to ensure

stable current to critical motherboard components. Voltage specifications are
more critical for future processors, so monitoring is necessary to ensure proper
system configuration and management.

• System Resources Alert: T oday’s operating systems, such as Windows 98, Win-

dows NT , and OS/2, require much more memory and hard drive space to present
enormous user interfaces and run large applications. The onboard hardware ASUS
ASIC in conjunction with either the bundled ASUS PC Probe or Intel LDCM
will warn the user before the system resources are used up to prevent possible
application crashes. Suggestions will give the user information on managing
their limited resources more efficiently.

Intelligence

2. FEATURES

• Dual Function Power Button: Through BIOS, the power button can be defined
as the “Stand by” (a.k.a. Suspend or Sleep) button or as the Soft-Off (see ATX
Power / Soft-Off Switch Lead in 3.8 Connectors for more information) button.
Regardless of the setting, pushing the power button for more than 4 seconds will
enter the Soft-Off mode.

• 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 any information from their computers from anywhere in the world.

• Message LED (requires ACPI OS support): Message LEDs now act as infor-
mation providers. Through the way a particular LED illuminates, the user can
determine if a message has been received from a fax/modem. A simple glimpse
provides useful information to the user. This function requires ACPI OS and
driver support.

• Peripheral Power Up: Keyboard or Mouse power up can be enabled or dis-
abled through BIOS setup to allow the computer to be powered ON using your
keyboard or mouse click.

ASUS CUSL2K User’s Manual 11

2.2 CUSL2K Motherboard Components

See opposite page for locations.

Processor Support Socket 370 for Pentium III/Celeron (FC-PGA) Processors ..... 1

MB Components

2. FEATURES

Expansion Slots 6 PCI Slots .............................................................................. 18

2. FEATURES

Location

Feature Setting DIP Switches ................................................... 5

Chipsets Intel 815E Graphics Memory Controller Hub (GMCH) .......... 2

Intel I/O Controller Hub 2 (ICH2) ......................................... 10

Firmware Hub (FWH) ............................................................ 12

Low Pin Count (LPC) Multi-I/O Chipset ............................... 11

Main Memory 3 DIMM Sockets (maximum 512MB support) ........................ 3

PC133 SDRAM support

1 Accelerated Graphics Port (AGP) Slot................................ 19

1 CNR Slot ............................................................................. 15

System I/O USB Headers .......................................................................... 14

1 Floppy Disk Drive Connector ............................................... 6

2 IDE Connectors (UltraDMA/100 Support) ........................... 4

1 Serial COM2 Header ............................................................. 7

1 ASUS iPanel Connector ........................................................ 8

1 Parallel Port Connector ............................................. (Top) 23

1 Serial COM1 Port Connector .............................. (Bottom) 24

2 USB Port Connectors ......................................................... 25

1 PS/2 Mouse Connector .............................................. (Top) 26

1 PS/2 Keyboard Connector ................................... (Bottom) 26

3D Graphics Graphics and Memory Controller Hub

1 VGA Monitor Output Connector ......................................... 22

TV-Out/Digital LCD Module Headers ................................... 20

Audio AC’97 V2.1 Audio Codec (optional)

1 Game/MIDI Connector (on audio model only)
1 Line Out Connector (on audio model only)
1 Line In Connector (on audio model only)
1 Microphone Connector (on audio model only)

Network Features Wake-On-LAN Connector...................................................... 17

Wake-On-Ring Connector ........................................................ 9

Hardware Monitoring System Voltage Monitoring (integrated in ASUS ASIC) ....... 13

3 Fan Power and Speed Monitoring Connectors

Power ATX Power Supply Connector ............................................... 21

Special Feature Onboard LED ......................................................................... 16

Form Factor ATX

12

ASUS CUSL2K User’s Manual

2. FEATURES

2.2.1 Component Locations

26
25

24

23

22
21

20

1234

65

2. FEATURES

Component Location

19
18

17

16

15

14

13

12

11

10

9

8

7

ASUS CUSL2K User’s Manual 13

3. HARDWARE SETUP

3.1 CUSL2K Motherboard Layout

PS/2KBMS

T: Mouse
B: Keyboard

KBPWR

USB

T: Port1
B: Port

2

COM1

PARALLEL PORT

Motherboard Layout

VGA

3. H/W SETUP

Line
Out

Line

In

Mic

In

GAME_AUDIO

VIDEO

USBPWR01

PWR_FAN

LCDTV

AUX

Socket 370

Intel 815E

Graphics &

Memory

Controller

Hub (GMCH)

ATX Power Connector

Accelerated Graphics Port (AGP)

CPU_FAN

VIO

DIMM1 (64/72 bit, 168-pin module)

DIMM2 (64/72 bit, 168-pin module)

DIMM3 (64/72 bit, 168-pin module)

1

0

3

2

5

ROW

4

SECONDARY IDE

DSW

DIP

Switches

PRIMARY IDE

FLOPPY

AAPANEL

MODEM

MIC2

Audio

Codec

EARPHONE

CD1

PCI1

PCI2

WOL_CON

SMB

CR2032 3V
Lithium Cell

CMOS Power

®

PCI3

JTPWR

Audio
Codec
Setting

PLED2

PCI4

PCI5

CUSL2K

PCI6

Firmware

Hub

(FWH)

ASUS ASIC

Hardware

JEN

ACHA

Super

I/O

CNR1

Grayed components are optional at the time of purchase.

Intel I/O

Controller

Hub

(ICH2)

with

Monitor

WOR

CLRTC

AFPANEL

USB2

CHA_FAN

COM2

IDELED

PANEL

14

ASUS CUSL2K User’s Manual

3. HARDWARE SETUP

3.2 Layout Contents

Motherboard Settings

1) JEN p.18 JumperFree™ Mode (Enable/Disable)

2) USBPWR01 p.19 USB Device Wake Up (Enable/Disable)
USBPWR2
USBPWR56

3) ADN# p.20 Onboard Audio CODEC (Enable/Disable)

4) KBPWR p.20 Keyboard Power Up (Enable/Disable)

5) VIO p.21 Voltage I/O Setting (3.3V/3.40V/3.60V)

6) DSW p.22 CPU External Frequency Setting

Expansion Slots

1) DIMM1/2/3 p.24 168-Pin System Memory Support

2) CPU p.26 Central Processing Unit (CPU)

3) PCI1/2/3/4/5/6 p.27 32-bit PCI Bus Expansion Slots

4) CNR1 p.28 Communication and Network Riser Slot

5) AGP p.29 Accelerated Graphics Port (AGP) Slot

Connectors

1) PS2KBMS p.30 PS/2 Mouse Connector (6-pin female)

2) PS2KBMS p.30 PS/2 Keyboard Connector (6-pin female)

3) USB p.31 Universal Serial Bus Ports (Two 4-pin female)

4) PRINTER p.31 Parallel Port Connector (25-pin female)

5) COM1/COM2 p.32 Serial Port Connectors (9-pin male, 10-1 pin)

6) VGA p.32 Monitor Output Connector (15-pin female)

7) GAME_AUDIO p.33 Game/MIDI Connector (15-pin female) (optional)

8) GAME_AUDIO p.33 Audio Port Connectors (Three 1/8” female) (optional)

9) FLOPPY p.33 Floppy Disk Drive Connector (34-1pins)

10) PRIMAR Y/SECONDARY IDE p.34 Primary/Secondary IDE Connectors (Two 40-1pins)

11) IDELED p.35 IDE Activity LED (2 pins)

12) CPU_FAN, PWR_FAN p.35 CPU, Power Supply, Chassis Fan Connectors (Three 3-pin)
CHA_FAN

13) CD1, AUX, p.36 Internal Audio Connectors (Four 4-pins) (optional)
VIDEO, MODEM

3. H/W SETUP

Layout Contents

14) EARPHONE p.36 Headphone True-Level Line Out Header (3 pins)

15) MIC2 p.37 Internal Microphone Connector (3 pins)

16) AFPANEL/IR_CON p.37 ASUS iPanel Connector (12-1 pins)

17) AAPANEL p.37 ASUS iPanel Audio Connector (12-1 pins)

18) SMB p.38 SMBus Connector (5-1 pins)

ASUS CUSL2K User’s Manual 15

3. HARDWARE SETUP

19) ACHA p.38 Chassis Intrusion Connector (2 pins)

20) WOL_CON p.39 Wake-On-LAN Connector (3 pins)

21) WOR_CON p.39 Wake-On-Ring Connector (2 pins)

22) LCDTV p.40 LCD-TV Headers (18-1 pins/18 pins)

23) USB2, USB56 p.40 USB Headers (5-1 pins, 5 pins)

24) ATXPWR p.41 ATX Power Supply Connector (20 pins)

25) JTPWR p.41 Power Supply Thermal Sensor Connector (2 pins)

26) PWRLED (PANEL) p.42 System Power LED Lead (3-1 pins)

27) KEYLOCK (PANEL) p.42 Keyboard Lock Switch Lead (2 pins)

28) SPEAKER (PANEL) p.42 System Warning Speaker Connector (4 pins)

29) MSG.LED (PANEL) p.42 System Message LED (2 pins)

30) SMI (PANEL) p.42 System Management Interrupt Switch Lead (2 pins)

31) PWRSW (PANEL) p.42 ATX Power / Soft-Off Switch Lead (2 pins)

Layout Contents

3. H/W SETUP

32) RESET (PANEL) p.42 Reset Switch Lead (2 pins)

16

ASUS CUSL2K User’s Manual

3. HARDWARE SETUP

3.3 Hardware Setup Procedure

Before using your computer, you must complete the following steps:

• Check Motherboard Settings

• Install Memory Modules

• Install the Central Processing Unit (CPU)

• Install Expansion Cards

• Connect Ribbon Cables, Panel Wires, and Power Supply

3.4 Motherboard Settings

WARNING! Computer motherboards and expansion cards contain very delicate

Integrated Circuit (IC) chips. To protect them against damage from static electric­ity, 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

removing 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.

PLED2

Settings

Motherboard

3. H/W SETUP

®

CUSL2K

CUSL2K Onboard LED

ASUS CUSL2K User’s Manual 17

ON

Standby

Power

OFF

Powered

Off

3. H/W SETUP

Motherboard

Settings

3. HARDWARE SETUP

Motherboard Feature Settings

The motherboard’s onboard functions are either adjusted through jumpers or DIP
switches. When using DIP switches, the white block represents the switch’s posi­tion. The example below shows all the switches in the OFF position.

DSW

12345

ON

ON OFF

®

CUSL2K

CUSL2K DIP Switches

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 4.4 Advanced Menu).

NOTE: In JumperFree™ mode, all dip switches must be set to OFF.
Setting JEN

Disable (Jumper) [1-2]
Enable (JumperFree) [2-3] (default)

1. Frequency Selection

2. Frequency Selection

3. Frequency Selection

4. Frequency Selection

5. Frequency Selection.

®

CUSL2K

CUSL2K JumperFree™ Mode Setting

DSW

Disable

12

ON

OFF

JEN

12345

Enable(default)

2

3

18

ASUS CUSL2K User’s Manual

3. HARDWARE SETUP

2) USB Device Wake Up (USBPWR01,USBPWR2, USBPWR56)

These allow you to disable or enable the USB device wake up function. Set these
jumpers to Enable if you wish to use your USB devices to wake up your computer .
This feature requires an ATX power supply that can supply at least 2A on the
+5VSB lead. The default is set to Disable because not all computers have the
appropriate ATX power supply. Your computer will not power ON if you set this
to Enable and do not have the appropriate ATX power supply. NOTE: This jumper
must be set in conjunction with W ake On USB for STR State in 4.5.1 Power Up

Control.
NOTES

1. For suspend to RAM function, these jumpers must be set to Enable.

2. The total current consumed must NOT exceed the power supply capability
(+5VSB) whether under normal working conditions or in the sleep mode.

Setting USBPWR01, USBPWR2, USBPWR56

Disable [1-2] (default)
Enable [2-3]

®

CUSL2K

CUSL2K USB Device Wake Up

USBPWR01

USBPWR2

USBPWR56

2

1

Disable

(Default)

2

Enable

Settings

Motherboard

3. H/W SETUP

3

ASUS CUSL2K User’s Manual 19

3. HARDWARE SETUP

3) Onboard Audio CODEC Setting (ADN#)

(available on audio model only)
The onboard audio CODEC may be enabled or disabled using all of these jump­ers. Disable the onboard audio CODEC if you are using an ISA or PCI audio
card on any of the expansion slots or a primary audio/modem CNR on a CNR
slot (see CNR Slot later in this section). If using a PCI audio expansion card,
Onboard AC97 Audio Controller in 4.4.2 I/O Device Configuration must
also be disabled.

Setting ADN#

Enable [1-2] (default)
Disable [2-3]

3. H/W SETUP

Motherboard

Settings

ADN#

2
1

®

(Default)

CUSL2K

CUSL2K Audio Codec Setting

ADN#

3
2

DisableEnable

4) Keyboard Power Up (KBPWR)

This allows you to disable or enable the keyboard power up function. Set this
jumper to Enable if you wish to use your keyboard (by pressing <Spacebar>) to
power up your computer. This feature requires an ATX power supply that can
supply at least 300mA on the +5VSB lead. The default is set to Disable because
not all computers have the appropriate A TX power supply. Y our computer will not
power ON if you set this to Enable b ut do not have the appropriate ATX power
supply. NOTE: This jumper must be set in conjunction with Wake On PS2 KB/

PS2 Mouse/CIR in 4.5.1 Power Up Control.
Setting KBPWR

Enable [1-2] (default)
Disable [2-3]

20

®

CUSL2K

CUSL2K Keyboard Power Setting

ASUS CUSL2K User’s Manual

KBPWR

12

Enable Disable

2

3

3. HARDWARE SETUP

5) Voltage I/O Setting (VIO)

This jumper allows you to select the voltage supplied to the DRAM, chipset,
AGP, and PCI. The default setting of 3.40V should be used unless processor
overclocking requires a higher voltage.

Setting VIO

3.30 V [1-2]

3.40 V [2-3] (default)

3.60 V [3-4]

VIO

3

12

2

3

4

®

CUSL2K

CUSL2K VIO Setting

3.30 V 3.40 V

3.60 V

WARNING! Using a higher voltage may help when overclocking but may result

in the shortening of your computer component’s life. It is highly recommended
that you leave this setting on its default.

Settings

Motherboard

3. H/W SETUP

ASUS CUSL2K User’s Manual 21

3. HARDWARE SETUP

6) CPU External Frequency Setting (DSW)

This option tells the clock generator what frequency to send to the CPU, DRAM,
AGP, and the PCI bus. This allows the selection of the CPU’s External fre-
quency.

IMPORTANT:

1. In JumperFree mode, all dip switches must be set to OFF.

2. When JumperFree mode is enabled, use BIOS setup in place of these switches

(see CPU Speed in Advanced Menu in BIOS Setup).

NOTE: Only selected switches are illustrated. For a complete frequency listing,
see next page.

DSW

3. H/W SETUP

Motherboard

Settings

ON

68.7MHz

ON

140MHz
140MHz

70MHz

12345

12345

ON

133.70MHz

100.30MHz

66.85MHz

ON

(JumperFree Mode)

12345

12345

®

CUSL2K

CUSL2K CPU External
Clock (BUS) Frequency

CPU
DRAM
AGP

CPU
DRAM
AGP

ON

66.8MHz

100.2MHz

66.8MHz

12345

ON

140MHz
105MHz

70MHz

12345

100.3MHz

100.3MHz

66.8MHz

133.70MHz

133.70MHz

66.85MHz

ON

ON

12345

103.0MHz

103.0MHz

12345

Selection

NOTE: If your processor does not have a locked Frequency Multiple, you must
use CPU Core:Bus Freq. Multiple in 4.4 Advanced Menu to set the Frequency
Multiple. If the Frequency Multiple is locked, setting the Frequency Multiple in
BIOS setup will have no effect.

22

ASUS CUSL2K User’s Manual

3. HARDWARE SETUP

External Frequency Table

The following table is for use by experienced motherboard installers only . Overclock­ing can result in system instability or even shortening the life of the processor.

CPU:DRAM CPU SDRAM Frequency Selection Switches

Ratio (MHz) (MHz) 1 2 3 4 5

66:100 64.4 99.6 [ON] [ON ] [ON] [ON ] [ON]
66:100 60.0 90.0 [ON] [ON ] [ON] [ON ] [OFF]

66:100 66.0 100.0 [O N] [ON] [ON] [OFF] [ON]

66:100 68.3 102.5 [ON] [O N] [ON] [O FF] [OFF]
66:100 70.0 105.0 [ON] [O N] [O FF] [ON] [O N]
66:100 75.0 112.5 [O N] [ON ] [OFF] [ON ] [OFF]
66:100 80.0 120.0 [ON] [O N] [O FF] [O FF] [O N]

66:100 83.0 124.5 [ON] [O N] [O FF] [O FF] [OFF]
100:100 99.6 99.6 [ON ] [OFF] [O N] [ON ] [O N]
100:100 90.0 90.0 [ON ] [OFF] [O N] [ON ] [OFF]

100:100 100.0 100.0 [ON] [OFF] [O N] [OFF] [O N]
100:100 103.0 103.0 [O N] [OFF] [ON ] [OFF] [OFF]

100:100 105.0 105.0 [O N] [O FF] [O FF] [ON] [O N]
100:100 110.0 110.0 [O N] [O FF] [OFF] [ON] [O FF]
100:100 115.0 115.0 [O N] [O FF] [OFF] [O FF] [O N]
100:100 200.0 200.0 [O N] [O FF] [O FF] [OFF] [OFF]
133:133 132.8 132.8 [OFF] [ON] [O N] [O N] [ON]
133:133 166.6 166.6 [OFF] [ON] [O N] [O N] [O FF]

133:133 133.0 133.0 [OFF] [ON] [O N] [OFF] [O N]

133:133 137.0 137.0 [OFF] [ON] [O N] [O FF] [O FF]

133:133 140.0 140.0 [OFF] [ON] [O FF] [O N ] [O N ]

133:133 145.0 145.0 [OFF] [ON] [OFF] [O N ] [O FF]
133:133 150.0 150.0 [OFF] [ON] [OFF] [O FF] [O N ]
133:133 160.0 160.0 [OFF] [ON] [O FF] [O FF] [O FF]
133:100 132.8 99.6 [OFF] [OFF] [O N ] [O N ] [O N ]
133:100 166.6 125.0 [OFF] [OFF] [O N ] [O N ] [O FF]

133:100 133.0 100.0 [OFF] [OFF] [O N] [O FF] [O N ]

133:100 137.0 102.8 [OFF] [OFF] [O N ] [O FF] [O FF]

133:100 140.0 105.0 [OFF] [OFF] [O FF] [ON] [O N ]

133:100 145.0 108.8 [OFF] [OFF] [O FF] [O N ] [O FF]
133:100 150.0 112.5 [OFF] [OFF] [O FF] [O FF] [O N ]
133:100 160.0 120.0 [OFF] [OFF] [O FF] [O FF] [O FF]

Settings

Motherboard

3. H/W SETUP

For updated processor settings, visit ASUS’s web site (see ASUS CONTACT IN­FORMATION)

ASUS CUSL2K User’s Manual 23

3. HARDWARE SETUP

3.5 System Memory (DIMM)

NOTE: No hardware or BIOS setup is required after adding or removing memory.
This motherboard uses only Dual Inline Memory Modules (DIMMs). Sockets are

available for 3.3Volt (power level) unbuffered Synchronous Dynamic Random Ac-
cess Memory (SDRAM). One side (with memory chips) of the DIMM takes up one
row on the motherboard.

Memory speed setup is recommended through SDRAM Configuration in 4.4.1

Chip Configuration.

Install memory in any combination as follows:

DIMM Location 168-pin DIMM Total Memory

System Memory

3. H/W SETUP

Socket 1 (Rows 0&1) SDRAM 8, 16, 32, 64, 128, 256, 512MB x1
Socket 2 (Rows 2&3) SDRAM 8, 16, 32, 64, 128, 256, 512MB x1
Socket 3 (Rows 4&5) SDRAM 8, 16, 32, 64, 128, 256, 512MB x1

NOTE: Make sure the total installed memory does not exceeds 512MB. Otherwise,
the system may hang during startup.

3.5.1 General DIMM Notes

• ASUS motherboards support SPD (Serial Presence Detect) DIMMs. This is the
memory of choice for best performance vs. stability.

• BIOS shows SDRAM memory on bootup screen.

• Single-sided DIMMs come in 16, 32, 64,128, 256MB; double-sided come in 32,

64, 128, 256, 512MB.

NOTE: For PC133 SDRAM to run at 133MHz, the system CPU bus must also
operate at that speed.

Total System Memory (Max 512MB) =

24

ASUS CUSL2K User’s Manual

3. HARDWARE SETUP

3.5.2 Memory Installation

WARNING! Make sure that you unplug your power supply when adding or

removing memory modules or other system components. Failure to do so may
cause severe damage to both your motherboard and expansion cards (see 3.3
Hardware Setup Procedure for more information).

Insert the module(s) as shown. Because the number of pins are different on either
side of the breaks, the module will only fit in the orientation shown. DRAM SIMM
modules have the same pin contacts on both sides. SDRAM DIMMs have different
pin contacts on each side and therefore have a higher pin density.

20 Pins

60 Pins

®

88 Pins

CUSL2K

CUSL2K 168-Pin DIMM Sockets

The DIMMs must be 3.3Volt unbuffered SDRAMs. To determine the DIMM type,
check the notches on the DIMMs (see figure below).

3. H/W SETUP

System Memory

The notches on the DIMM will shift between left, center, or right to identify the type
and also to prevent the wrong type from being inserted into the DIMM slot on the
motherboard. You must tell your retailer the correct DIMM type before purchasing.
This motherboard supports four clock signals per DIMM.

ASUS CUSL2K User’s Manual 25

3.6 Central Processing Unit (CPU)

The motherboard provides a ZIF Socket 370. The CPU that came with the mother­board should have a fan attached to it to prevent overheating. If this is not the case,
then purchase a fan before you turn on your system.

WARNING! Be sure that there is sufficient air circulation across the processor’s

heatsink by regularly checking that your CPU fan is working. W ithout sufficient
circulation, the processor could overheat and damage both the processor and the
motherboard. You may install an auxiliary fan, if necessary.

To install a 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

3. H/W SETUP

CPU

upwards to a 90-degree angle. Insert the CPU with the correct orientation as shown.
The notched corner should point towards the end of the lever . Because the CPU has
a corner pin for two of the four corners, the CPU will only fit in the orientation as
shown. The picture is for reference only; you should have a CPU fan that covers the
face of the CPU. With the added weight of the CPU fan, no force is required to
insert the CPU. Once completely inserted, close the socket’s lever while holding
down the CPU. After the CPU is , install an Intel recommended fan heatsink. Locate
the CPU fan connector (see 3.1 Motherboard Layout or 3.8 Connectors) and con­nect the CPU fan cable to it.

3. HARDWARE SETUP

NOTE: Do not forget to set the correct Bus Frequency and Multiple (frequency
multiple setting is available only on unlocked processors) for your Socket 370 pro­cessor or else boot-up may not be possible. Socket 370 processors provide internal
thermal sensing so that a socket mounted thermal resistor is not needed.

CAUTION! Be careful not to scrape the motherboard when mounting a clamp-

style processor fan or else damage may occur to the motherboard.

Pentium III

®

CUSL2K

Gold Arrow

26

CUSL2K Socket 370

ASUS CUSL2K User’s Manual

3. HARDWARE SETUP

3.7 Expansion Cards

WARNING! Unplug your power supply when adding or removing expansion

cards or other system components. Failure to do so may cause severe damage to
both your motherboard and expansion cards (see 3.3 Hardware Setup Proce-

dure for more information).

3.7.1 Expansion Card Installation Procedure

1. Read the documentation for your expansion card and make any necessary hard­ware or software settings for your expansion card, such as jumpers.

2. Remove your computer system’s cover and the bracket plate on the slot you
intend to use. Keep the bracket for possible future use.

3. Carefully align the card’s connectors and press firmly.

4. Secure the card on the slot with the screw you removed above.

5. Replace the computer system’s cover.

6. Set up the BIOS if necessary
(such as IRQ xx Used By ISA: Yes in PNP AND PCI SETUP)

7. Install the necessary software drivers for your expansion card.

3.7.2 Assigning IRQs for Expansion Cards

Some expansion cards need an IRQ to operate. Generally, an IRQ must be exclu­sively assigned to one use. In a standard design, there are 16 IRQs available but
most of them are already in use, leaving 6 IRQs free for expansion cards. If your
motherboard has PCI audio onboard, an additional IRQ will be used. If your moth-

erboard also has MIDI enabled, another IRQ will be used, leaving 4 IRQs free.

Standard Interrupt Assignments

IRQ Priority Standard Function

0 1 System Timer
1 2 Keyboard Controller
2 N/A Programmable Interrupt
3* 11 Communications Port (COM2)
4* 12 Communications Port (COM1)
5* 13 Sound Card (sometimes LPT2)
6 14 Floppy Disk Controller
7* 15 Printer Port (LPT1)
8 3 System CMOS/Real Time Clock
9* 4 ACPI Mode when enabled
10* 5 IRQ Holder for PCI Steering
11* 6 IRQ Holder for PCI Steering
12* 7 PS/2 Compatible Mouse Port
13 8 Numeric Data Processor
14* 9 Primary IDE Channel
15* 10 Secondary IDE Channel

*These IRQs are usually available for ISA or PCI devices.

3. H/W SETUP

Expansion Cards

ASUS CUSL2K User’s Manual 27

3. HARDWARE SETUP

Interrupt Request Table for this Motherboard

Interrupt requests are shared as shown by the following table:

ABCDEFGH

PCI slot 1 —————shared ——
PCI slot 2 ——————not shared —
PCI slot 3 ———————not shared
PCI slot 4 ————shared ———
PCI slot 5 —————shared ——
PCI slot 6 ——not shared —————
Onboard VGA shared ———————
AGP shared ———————
CNR LAN ————shared ———

CNR Audio/Modem — not shared ——————

Expansion Cards

3. H/W SETUP

IMPORTANT: If using PCI cards on shared slots, make sure that the drivers sup-

port “Share IRQ” or that the cards do not need IRQ assignments. Conflicts will arise
between the two PCI groups that will make the system unstable or cards inoperable.

3.7.3 Communication and Networking Riser (CNR) Slot

This connector supports specially designed network, audio, or modem riser cards.
Main processing is done through software and controlled by the motherboard’s sys-
tem chipset. This provides upgradeable network, audio, and/or modem solutions at
an incredibly low cost.

NOTE: CNRs are not included with this motherboard.

®

CUSL2K

CUSL2K Communication & Networking Riser Connectors

28 ASUS CUSL2K User’s Manual

3. HARDWARE SETUP

3.7.4 Accelerated Graphics Port (AGP) Slot

This motherboard provides an accelerated graphics port (AGP) slot to support AGP
graphics cards.

®

CUSL2K

CUSL2K Accelerated Graphics Port (AGP)

3. H/W SETUP

Expansion Cards

ASUS CUSL2K User’s Manual 29

3.8 External Connectors

WARNING! Some pins are used for connectors or power sources. These are

clearly distinguished from jumpers in the Motherboard Layout. Placing jumper
caps over these connector pins will cause damage to your motherboard.

IMPORTANT: Ribbon cables should always be connected with the red stripe to

Pin 1 on the connectors. Pin 1 is usually on the side closest to the power connec­tor on hard drives and CD-ROM drives, but may be on the opposite side on
floppy disk drives. Check the connectors before installation because there may
be exceptions. IDE ribbon cable must be less than 46 cm (18 in.), with the sec­ond drive connector no more than 15 cm (6 in.) from the first connector.

3. H/W SETUP

Connectors

1) PS/2 Mouse Connector (Green 6-pin PS2KBMS)

3. HARDWARE SETUP

The system will direct IRQ12 to the PS/2 mouse if one is detected. If one is not
detected, expansion cards can use IRQ12. See PS/2 Mouse Function Control
in 4.4 Advanced Menu.

PS/2 Mouse (6-pin female)

2) PS/2 Keyboard Connector (Purple 6-pin PS2KBMS)
This connection is for a standard keyboard using an PS/2 plug (mini DIN). This
connector will not allow standard AT size (large DIN) keyboard plugs. You
may use a DIN to mini DIN adapter on standard AT keyboards.

PS/2 Keyboard (6-pin female)

30 ASUS CUSL2K User’s Manual