Asus SP98-N User manual

R
SP98-N
Pentium®NLX Motherboard
USER’S MANUAL

ASUS SP98-N User’s Manual
2
USER’S NOTICE
Product Name: ASUS SP98-N
Manual Revision: 1.02
Release Date: February 1998
No part of this manual, including the products and software described in it, may be repro-
duced, 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 pur-
poses, 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 NOTLIMITED TO THE IMPLIED
WARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FORAPAR-
TICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS,
EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDEN-
TAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF
PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSI-
NESS AND THE LIKE), EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY
OF SUCH DAMAGESARISING 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 trade-
marks or copyrights of their respective companies, and are used only for identification or
explanation and to the owners’ benefit, without intent to infringe.
• Intel, LANDesk, and Pentium are registered trademarks of Intel Corporation.
• IBM and OS/2 are registered trademarks of International Business Machines.
• Symbios is a registered trademark of Symbios Logic Corporation.
• Windows and MS-DOS are registered trademarks of Microsoft Corporation.
• Sound Blaster AWE32 and SB16 are trademarks of Creative Technology Ltd.
• Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated.
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, contactASUS
at http://www.asus.com.tw or through any of the means indicated on the following page.
SPECIFICATIONSAND INFORMATION CONTAINED IN THIS MANUALARE FUR-
NISHED FOR INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT
ANY TIME WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COM-
MITMENT BY ASUS. ASUS ASSUMES NO RESPONSIBILITY OR LIABILITY FOR
ANYERRORSOR INACCURACIESTHATMAYAPPEARINTHISMANUAL,INCLUD-
ING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Copyright © 1998 ASUSTeK COMPUTER INC.All Rights Reserved.

ASUS SP98-N User’s Manual 3
ASUS CONTACT INFORMATION
ASUSTeK COMPUTER INC.
Marketing
Address: 150 Li-Te Road, Peitou, Taipei, Taiwan 112
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support
Fax: [phone]
BBS: [phone]
Email: [email protected]
WWW: www.asus.com.tw
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER INTERNATIONAL
Marketing
Address: 6737 Mowry Ave, Mowry Business Center, Building 2,
Newark, CA 94560, USA
Fax: [phone]
Email: [email protected]
Technical Support
Fax: [phone]
BBS: [phone]
Email: [email protected]
WWW: www.asus.com
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER GmbH
Marketing
Address: Harkort Str. 25, 40880 Ratingen, BRD, Germany
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support
Hotline: [phone]
BBS: 49-2102-448690
Email: [email protected]
WWW: www.asuscom.de
FTP: ftp.asuscom.de/pub/ASUSCOM

ASUS SP98-N User’s Manual
4
CONTENTS
I. INTRODUCTION...........................................................................7
How this Manual is Organized ........................................................7
Item Checklist ..................................................................................7
II. FEATURES ....................................................................................8
Features of the ASUS SP98-N Motherboard ...................................8
Parts of the ASUS SP98-N Motherboard ...................................9
Riser Card Back .........................................................................9
Riser Card Front .........................................................................9
III. INSTALLATION ........................................................................10
ASUS SP98-N Motherboard Layout .............................................10
Installation Steps............................................................................12
1. Jumpers ......................................................................................12
Jumper Settings ..................................................................13
Compatible Cyrix CPU Identification ................................15
Using your own VGA card on the PCI expansion slot .......17
2. System Memory (DIMM) .........................................................18
DIMM Memory Installation Procedures: ...........................19
3. Central Processing Unit (CPU).................................................20
4. Expansion Cards .......................................................................21
Expansion Card Installation Procedure: .............................21
Assigning IRQs for Expansion Cards.................................21
Assigning DMA Channels for ISA Cards...........................22
ISA Cards and Hardware Monitor ......................................22
5. External Connectors..................................................................23
Front Panel Features.................................................................28
Power Connection Procedures .................................................31
IV. BIOS SOFTWARE .....................................................................32
Support Software ...........................................................................32
Flash Memory Writer Utility....................................................32
Main Menu .........................................................................32
Advanced Features Menu ...................................................33
Managing and Updating Your Motherboard’s BIOS................34
6. BIOS Setup ...............................................................................35
Load Defaults .....................................................................36
Standard CMOS Setup .............................................................36
Details of Standard CMOS Setup:......................................37
BIOS Features Setup ................................................................39
Details of BIOS Features Setup..........................................39
Chipset Features Setup .............................................................41
Details of Chipset Features Setup.......................................41
Power Management Setup........................................................44
Details of Power Management Setup .................................44
PNP and PCI Setup ..................................................................46

ASUS SP98-N User’s Manual 5
CONTENTS
Details of PNP and PCI Setup ............................................46
Load BIOS Defaults .................................................................47
Load Setup Defaults .................................................................48
Smart Alarm (LM78/LM75) Setup ..........................................48
Supervisor Password and User Password ................................49
IDE HDD Auto Detection ........................................................50
Save and Exit Setup .................................................................51
Exit Without Saving .................................................................51
V. SUPPORT SOFTWARE..............................................................52
Desktop Management Interface (DMI)..........................................52
Introducing the ASUS DMI Configuration Utility .............52
System Requirements .........................................................52
Using the ASUS DMI Configuration Utility ......................53
Notes...................................................................................53
VI. ASUS PCI SCSI Cards ..............................................................55
Symbios SCSI BIOS and Drivers ..................................................55
ASUS PCI-SC200 & PCI-SC860 SCSI Cards ..............................55
Setting Up the ASUS PCI-SC200 & PCI-SC860.....................56
Setting the INTAssignment for the ASUS PCI-SC200 ...........56
Terminator Requirements for SCSI Devices............................56
Terminator Settings for theASUS PCI-SC860 ........................57
Terminator Settings for theASUS PCI-SC200 ........................57
SCSI ID Numbers for SCSI Devices .......................................58
SCSI ID Priority .......................................................................58
VII. ASUS Network Interface..........................................................59
VIDEO SOFTWARE USER’S MANUAL ......................................73
VIII. DOS UTILITY .........................................................................75
1. SVGAUTL.EXE ........................................................................75
1.1 General Description ...........................................................75
1.2 General Usage ....................................................................75
1.3 Commandline Options .......................................................76
A1. Video Modes......................................................................76
IX. SOFTWARE DRIVERS .............................................................82
1. Windows 3.1 ..............................................................................82
2. Windows 95 ...............................................................................86
3. Windows NT 3.5 & 3.51 ............................................................88
4. Windows NT 4.0 ........................................................................89
5. Autodesk ADI 4.2 -Protected Mode...........................................90
6. OS/2 V2.1 ..................................................................................94
7. OS/2 V3.0 (Warp) ......................................................................95
8. Double Bytes OS/2 Warp...........................................................96

ASUS SP98-N User’s Manual
6
FCC & DOC COMPLIANCE
FederalCommunicationsCommission 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 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 inter-
ference 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! 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.
CanadianDepartmentof 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 Cana-
dian Department of Communications.

ASUS SP98-N User’s Manual 7
I. INTRODUCTION
I. INTRODUCTION
Manual / Checklist
How this Manual is Organized
This manual is divided into the following sections:
I. Introduction: Manual information and checklist
II. Features: Information and specifications concerning this product
III. Installation: Instructions on setting up the motherboard
IV. BIOS Software: Instructions on setting up the BIOS software
V. Support Software: Information on the included support software
VI. ASUS SCSI Cards: Installation of ASUS SCSI cards (optional)
Item Checklist
Please check that your package is complete. If you discover damaged or missing
items, please contact your retailer.
(1) ASUS motherboard
(1) IDE ribbon cable
(1) Floppy ribbon cable for one 3.5inch floppy drive
(1) Support drivers and utilities
(1) Motherboard User’s Manual
(1) System housing User’s Manual
(1) NLX Form-factor system housing, riser card, and power supply (optional)
DIMM memory module (optional)
3.5inch Floppy Drive (optional)
Slim CD-ROM and cable (optional)
ASUS PCI-SC200 Fast-SCSI or PCI-SC860 Ultra-Fast SCSI card (optional)

8 ASUS SP98-N User’s Manual
Features of the ASUS SP98-N Motherboard
The ASUS SP98-N motherboard is carefully designed for the demanding PC user
who wants many features in a small package, namely:
•Mini NLX: Features ASUS’ custom-designed mini-NLX form factor.
•SiS Chipset: Features the SiS 5598 chipset with built-in video controller and
support for video-shared memory from 1MB to 4MB.
•OnboardAudio: Yamaha 16-bit audio onboard.
•Slim CD-ROM: Supports a notebook-sized slim CD-ROM drive.
•Wake on LAN: Supports wake on LAN activity with built-in network support.
•Intel Network Interface: Equipped with the Intel 82558 Ethernet LAN Con-
troller (fully integrated 10BASE-T/100BASE-TX) with LED indicators for
monitoring network conditions.
•VersatileProcessorSupport: Intel Pentium
®
75–233MHz(P55C-MMX
™
,P54C/
P54CS), IBM
®
/Cyrix
®
6x86-PR166+ (Rev 2.7 or later), IBM
®
/Cyrix
®
6x86MX
™
(PR166 & faster), AMD-K5
™
(PR75–PR133), AMD-K6
™
(PR166 & faster).
•Versatile Memory Support: Equipped with two DIMM sockets to support 8-
128MB 168-pin 3.3Volt SDRAM memory modules up to 256MB.
•SuperMulti-I/O:Provides an onboard I/O processor for two high-speed UART-
compatible serial ports and one parallel port with EPP and ECP capabilities.
•Level 2 Cache: Comes with onboard 512K Pipelined Burst SRAM.
• 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.) (See section V)
•PCI Bus Master IDE Controller: Onboard Ultra DMA/33 Bus Master IDE
controller with two connectors (one for CD-ROM only). Supports two IDE de-
vices up to 8.4GB using one channel. Supports Bus Master UltraDMA/33 IDE,
PIO Modes 3 & 4, and Bus Master IDE DMA Mode 2. Includes integrated key-
board controller. Supports two of either 5.25-inch (360KB, 1.2KB) or 3.5-inch
disk drives (720KB, 1.44MB, 2.88MB). Supports Japanese “Floppy 3 mode”
(3.5-inch disk drive: 1.2MB) and LS-120 floppy disk drives (3.5-inch disk drive:
120 MB, 1.44MB, 720K). BIOS supports IDE CD-ROM or SCSI device bootup.
•Symbios SCSI BIOS: Supports optional ASUS SCSI controller cards through
onboard firmware.
•Performance: Provides 528MB/s data transfer rate using SDRAM, 33MB/s IDE
transfer rate using Bus Master UltraDMA/33 IDE, concurrent PCI allows multiple
PCI transfers.
•Compliancy:ACPI ready for advanced power management features and PC97
compliancy for greater support.
•Easy Installation: Incorporates BIOS that supports autodetection of hard disk
drives, PS/2 mouse, and Plug and Play devices to make setup of hard disk drives,
expansion cards, and other devices virtually automatic.
•Riser Card: Provides NLX power, primary IDE, floppy drive, LAN wake up
connector, 2 PCI slots, 1 ISA slot, 2 USB ports, and IrDA.
II. FEATURES
Features
II. FEATURES

ASUS SP98-N User’s Manual 9
Parts of the ASUS SP98-N Motherboard
II. FEATURES
II. FEATURES
Motherboard Parts
2 USB Ports
IrDAPort Primary IDE
Connector
NLX Power
Connector
Riser Card Back
2 PCI Slots
1ISA Slot Floppy Drive
Connector
Riser Card Front
NLX Slot
Multi-I/O
T: PS/2 Mouse
B: PS/2 Keyboard
T: Parallel Conn.
B: Serial Conn. COM 2
Programmable
Flash ROM
Intel 82558
Ethernet LAN
Controller
SiS 5598
Chipset
2 DIMM
Sockets
Intel CPU
Compatible
ZIF Socket 7
COM 1 VGA Connector Joystick/MIDI Connector
LANActivity
Indicator
512KB Pipelined
Burst L2 Cache
RJ45
Port

10 ASUS SP98-N User’s Manual
III. INSTALLATION
ASUS SP98-N Motherboard Layout
DIMM Socket 2 (64-bit, 168-pin module)
DIMM Socket 1 (64-bit, 168-pin module)
R
Flash EEPROM
(Programmable BIOS)
Multi I/O Chip
PS/2
MOUSE (TOP PORT)
KEYBOARD (BOTTOM)
SiS
5598
Chipset
Intel 82558
Ethernet LAN
Controller
FS1
FS2
FS3
BUS Freq.
512KB Pipelined
Burst L2 Cache
32 10Row
VID0 VID1 VID2
CPU Voltage
Parallel Port
COM 1 COM 2
CDROM Connector
VGA Joystick/MIDI
RJ-45
CPU_FAN
RTCLR
Jack Connector
BF2 BF1 BF0
Freq. Ratio
FS1
CMOS Power
CR2032
3 Volt Cell
Hardware Monitoring
LM78
VGA Setting
VGA Interrupt
Feature Connector
VGA Setting 1
Switching Voltage Regulators
Audio
Chipset
+5V TAG RAM
CPU ZIF Socket 7
LM75
PCI Freq. Sel.
CPU Thermal Sensor
(Hardware Monitor)
CR2
Internal Speaker Connector
Motherboard Layout
III. INSTALLATION
Floppy Drive Conn.
PCI Slot 2
PCI Slot 1
ISA Slot 1
Panel Conn.
NLX Ext. Riser Slot Riser Slot Riser Slot
LAN LED Wake on LAN
MIC Con.
Riser Card Front
Primary IDE
NLX Power
USB1&2
Infrared
Riser Card Back

ASUS SP98-N User’s Manual 11
III. INSTALLATION
Jumpers
1) RTCLR p. 13 Real Time Clock RAM (Normal Setting/Clear CMOS)
2) BF0, BF1, BF2 p. 14 CPU:BUS Frequency Ratio
3) FS0, FS1, FS2, FS3 p. 14 CPU External Clock (BUS) and PCI Frequency Selection
4) VID0,VID1,VID2,VID3 p. 16 CPU Voltage Regulator Output Selection
5) VGA_SEL,VGA_SEL1 p. 17 VGA Selection
6) INT_SEL p. 17 VGA Interrupt Selection
Expansion Slots
1) DIMM Sockets p. 18 168-Pin DIMM Memory Expansion Sockets
2) CPU ZIF Socket 7 p. 20 Central Processing Unit (CPU) Socket
3) SLOT 1 p. 21 16-bit ISA Bus Expansion Slots
4) PCI 1, PCI 2 p. 21 32-bit PCI Bus Expansion Slots
Connectors
1) PS2KBMS p. 23 PS/2 Keyboard Connector (6-pin Female)
2) PS2KBMS p. 23 PS/2 Mouse Connector (6-pin Female)
3) GAME_PORT p. 23 Joystick or MIDI Connector (15-pin Female)
4) PRINTER p. 24 Parallel Port Connector (25-pin Female)
5) COM1, COM2 p. 24 Serial Port COM1 and COM2 (Two 9-pin Male)
6) VGA p. 24 VGA Compatible Connector (15-pin Female)
7) RJ-45 p. 24 RJ-45 Connector (8-pin Female)
8) LAN_LED p. 24 LAN Condition LED (3-diode Indicator)
9) USB p. 25 Universal Serial BUS Ports 1 & 2 (Two 4-pin Female)
10) IR p. 25 IrDA/Fast IR-Compliant Infrared Module
11) POWER p. 25 NLX Power Supply Connector (20-pin Block)
12) IDE1 p. 26 Primary IDE Connector (40-pin Block)
13) FLOPPY p. 26 3.5-inch Floppy Drive Connector (34-pin Block)
14) LAN_LED p. 26 LAN Activity Connectors (2-pin & 3-pin)
15) PAN_CON p. 27 Front Panel Display LEDs and Switches (16-1 pin)
16) MIC_CON p. 27 Front Panel Microphone Jack Connector (2 pin)
17) CPU_FAN p. 29 CPU Fan Power (3-pin Block)
18) JACK_CONN p. 29 Back Panel Audio Connectors (10-1 pin Block)
19) INT_SPKR p. 29 Internal Speaker Connector (4 pins)
20) CDROM p. 30 CD-ROM Drive Connector (50-1 pins)
21) FEATURE p. 30 Video Feature Connector (26 pins)
(Map of Board)
III. INSTALLATION

12 ASUS SP98-N User’s Manual
III. INSTALLATION
Jumpers
III. INSTALLATION
Installation Steps
Before using your computer, you must complete the following steps:
1. Set Jumpers on the Motherboard
2. Install System Memory
3. Install the Central Processing Unit (CPU)
4. Install Expansion Cards
5. Connect Ribbon Cables, Cabinet Wires, and Power Supply
6. Setup the BIOS Software
1. Jumpers
Several hardware settings are made through the use of jumper caps to connect jumper
pins (JP) on the motherboard. See “Motherboard Layout” for locations of jumpers.
The jumper settings will be described numerically, such as [----], [1-2], [2-3] for no
connection, connect pins 1&2, and connect pins 2&3 respectively. A “1” is written
besides pin 1 on jumpers with three pins. The jumpers will also be shown graphi-
cally such as to connect pins 1&2 and to connect pins 2&3. Jumpers
with two pins will be shown as for Short (On) and for Open (Off). For
manufacturing simplicity, the jumpers may be sharing pins from other groups. Use
the diagrams in this manual instead of following the pin layout on the board. Set-
tings with two jumper numbers require that both jumpers be moved together. To
connect the pins, simply place a plastic jumper cap over the two pins as diagrammed.
WARNING!Computer motherboards, baseboards andcomponents, suchas SCSI
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.

ASUS SP98-N User’s Manual 13
III. INSTALLATION
III. INSTALLATION
Jumpers
1. Real Time Clock (RTC) RAM (RTCLR)
The CMOS RAM is powered by an onboard button cell battery. To clear the
RTC data: (1) Turn off your computer and remove theAC power , (2) Move this
jumper to “Clear CMOS” (3) Move the jumper back to “Normal Setting,” (4)
Turn on your computer, (5) Hold down <Delete> during bootup and enter BIOS
setup to re-enter user preferences.
Battery Test Jumper (RTCLR)
You can test the battery’s current by removing the RTCLR jumper and touching
the “Normal Setting” pins with the test probes from a battery tester.
WARNING! You must unplug the power cord to your power supply to en-
sure that there is no power to your motherboard. The CMOS RAM con-
taining BIOS setup information may be cleared by this action. You should
enter BIOS to “Load Setup Defaults” and re-enter any user information
after removing and reapplying the RTCLR jumper.
RTC RAM RTCLR
Normal Setting [1-2] (Default)
Clear CMOS [2-3] (momentarily)
Jumper Settings
SP98-N Real Time Clock (RTC) RAM
Normal Setting (Default)
RTCLR
Clear CMOS
RTCLR
3
2
1
3
2
1
R
WARNING! Move the jumper to the “Clear CMOS”
setting only when clearing RTC data. Otherwise, BIOS
setup information may be cleared.
Battery test

14 ASUS SP98-N User’s Manual
III. INSTALLATION
Jumpers
III. INSTALLATION
2. CPU to BUS Frequency Ratio (BF0, BF1, BF2)
These jumpers set the frequency ratio between the Internal frequency of the CPU
and the External frequency (called the BUS Clock) within the CPU. These must
be set together with the above jumpers CPU External (BUS) Frequency Selection.
3. CPUExternal Clock (BUS) (FS0,FS1, FS2) and PCI Frequency Selection(FS3)
These jumpers tell the clock generator what frequency to send to the CPU. These
allow the selection of the CPU’s External frequency (or BUS Clock). The BUS Clock
multiplied by the BUS Ratio equals the CPU’s Internal frequency (the advertised
CPU speed).
SP98-N CPU Jumpers
R
CPU External Clock (BUS) Frequency Selection
FS3
PCI Frequency Selection
Synchronous PCI Asynchronous PCI
Host
Sync PCI
Async PCI
FS1
FS0
FS2
1 2 3
50MHz
25MHz
32MHz
1 2 3
55MHz
27.5MHz
32MHz
1 2 3
60MHz
30MHz
32MHz
1 2 3
66.8MHz
33.4MHz
32MHz
1 2 3
75.9MHz
37.5MHz
32MHz
1 2 3
83.3MHz
41.7MHz
32MHz
FS3
1 2 3
FS3
1 2 3
Match the Ratio column
of the table on the opposite
page with these CPU types. CPU A
CPU B
CPU C
CPU D
CPU E
CPU F
----
----
----
----
4.0x(4/1)
1.5x(3/2)
3
2
1
BF1
BF2
BF0
3
2
1
BF1
BF2
BF0
3.0x(3/1)
3.0x(3/1)
----
----
3.0x(3/1)
----
3
2
1
BF1
BF2
BF0
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
2.0x(2/1)
2.5x(5/2)
2.0x(2/1)
3
2
1
BF1
BF2
BF0
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
----
----
----
----
4.5x(9/2)
1.5x(3/2)
BF1
BF2
BF0
2
3
1
BF1
BF2
BF0
1.5x(3/2)
3.5x(7/2)
3.0x(3/1)
3.0x(3/1)
3.5x(7/2)
----
CPU:BUS Frequency Ratio
WARNING! Do not overclock your processor. Overclocking can cause undue
stress on the CPU and motherboard. It may result in a slower speed or other
unpredictable outcomes. The table on the following page shows the approved
CPUs and their settings.

ASUS SP98-N User’s Manual 15
Set the jumpers according to the internal speed of your processor as follows:
(BUS Freq.) (Freq. Ratio)
CPU Model Freq. Ratio BUS F. FS0 FS1 FS2 FS3 BF2 BF1 BF0
Intel Pentium P54C 166MHz A-2.5x 66MHz [2-3] [1-2][2-3] [1-2] [2-3] [2-3] [1-2]
Intel Pentium P54C 150MHz A-2.5x 60MHz [1-2-] [2-3] [2-3] [1-2] [2-3] [2-3] [1-2]
Intel Pentium P54C 133MHz A-2.0x 66MHz [2-3] [1-2][2-3] [1-2] [2-3] [1-2] [1-2]
Intel Pentium P54C 120MHz A-2.0x 60MHz [1-2] [2-3] [2-3] [1-2] [2-3] [1-2] [1-2]
Intel Pentium P54C 100MHz A-1.5x 66MHz [2-3] [1-2][2-3] [1-2] [1-2] [1-2] [1-2]
Intel Pentium P54C 90MHz A-1.5x 60MHz [1-2] [2-3] [2-3] [1-2] [1-2] [1-2] [1-2]
Intel Pentium P54C 75MHz A-1.5x 50MHz [2-3] [2-3] [2-3] [1-2] [1-2] [1-2] [1-2]
AMD-K5-PR133 100MHz A-1.5x 66MHz [2-3] [1-2][2-3] [1-2] [1-2] [1-2] [1-2]
AMD-K5-PR120 90MHz A-1.5x 60MHz [1-2] [2-3] [2-3] [1-2] [1-2] [1-2] [1-2]
AMD-K5-PR100 100MHz A-1.5x 66MHz [2-3] [1-2][2-3] [1-2] [1-2] [1-2] [1-2]
AMD-K5-PR90 90MHz A-1.5x 60MHz [1-2] [2-3] [2-3] [1-2] [1-2] [1-2] [1-2]
AMD-K5-PR75 75MHz A-1.5x 50MHz [2-3] [2-3] [2-3] [1-2] [1-2] [1-2] [1-2]
Intel Pentium P55C 233MHz B-3.5x 66MHz [2-3] [1-2] [2-3] [1-2] [1-2] [1-2] [1-2]
Intel Pentium P55C 200MHz B-3.0x 66MHz [2-3] [1-2] [2-3] [1-2] [1-2] [2-3] [1-2]
Intel Pentium P55C 166MHz B-2.5x 66MHz [2-3] [1-2] [2-3] [1-2] [2-3] [2-3] [1-2]
IBM/Cyrix 6x86MX-PR233 200MHz B-3.0x 66MHz [2-3] [1-2][2-3] [1-2] [1-2] [2-3] [1-2]
IBM/Cyrix 6x86MX-PR200 166MHz B-2.5x 66MHz [2-3] [1-2][2-3] [1-2] [2-3] [2-3] [1-2]
IBM/Cyrix 6x86MX-PR166 150MHz B-2.5x 60MHz [1-2] [2-3] [2-3] [1-2] [2-3] [2-3] [1-2]
IBM/Cyrix 6x86-PR166+* 133MHz C-2.0x 66MHz [2-3] [1-2] [2-3] [1-2] [2-3] [1-2] [1-2]
IBM/Cyrix 6x86L-PR166+* 133MHz D-2.0x 66MHz [2-3] [1-2][2-3] [1-2] [2-3] [1-2] [1-2]
AMD-K6-PR233 233MHz E-3.5x 66MHz [2-3] [1-2][2-3] [1-2] [1-2] [1-2] [1-2]
AMD-K6-PR200 200MHz E-3.0x 66MHz [2-3] [1-2][2-3] [1-2] [1-2] [2-3] [1-2]
AMD-K6-PR166 166MHz E-2.5x 66MHz [2-3] [1-2][2-3] [1-2] [2-3] [2-3] [1-2]
IBM/Cyrix 6x86L-PR200+ 150MHz F-2.0x 75MHz [1-2] [2-3][1-2] [2-3] [2-3] [1-2] [1-2]
III. INSTALLATION
Jumpers
III. INSTALLATION
*Compatible Cyrix CPU Identification
The only IBM/Cyrix 6x86(L)-PR166+ (M1) CPU that is sup-
ported on this motherboard is revision 2.7 or later. Look the
underside of the CPU for the serial number. The number
should read G8DC6620A or later.

16 ASUS SP98-N User’s Manual
III. INSTALLATION
Jumpers
III. INSTALLATION
4. Voltage Regulator Output Selection (VID0, VID1, VID2, VID3)
These jumpers set the voltage supplied to the CPU.
Intel Pentium (P54C)
(75MHz-200MHz)
Pentium MMX (P55C)
(150MHz-233MHz) AMD-K6 (PR166 and faster) AMD-K5 (PR75-PR133) IBM/Cyrix 6x86(MX) (PR166 and faster) IBM/Cyrix 6x86(M1) (PR166 and faster)
WARNING! Because CPU designs change rapidly, the table below is only in-
tended as a simple guideline and thus may not be true for your CPU. Always
refer to the CPU documentation for your CPU’s voltage and then set the appro-
priate VID jumpers according to the illustration below.
Manufacturer CPU Type Single Plane Dual Plane VID0 VID1 VID2 VID3
Intel P54C/P54CS 3.5V(VRE) ---- [1-2] [1-2] [1-2] [1-2]
AMD K5 3.5V(VRE) ---- [1-2] [1-2] [1-2] [1-2]
IBM/Cyrix 6x86 3.5V(VRE) ---- [1-2] [1-2] [1-2] [1-2]
Intel P54C/P54CS 3.4V(STD) ---- [2-3] [1-2] [1-2] [1-2]
AMD K5 3.4V(STD) ---- [2-3] [1-2] [1-2] [1-2]
AMD (.35micron) K6-PR233 ---- 3.2V(Dual) [2-3] [2-3] [1-2] [1-2]
AMD (.35micron) K6-166,200 ---- 2.9V(Dual) [1-2] [2-3] [2-3] [1-2]
IBM/Cyrix 6x86MX ---- 2.9V(Dual) [1-2] [2-3] [2-3] [1-2]
Intel P55C-MMX ---- 2.8V(Dual) [2-3] [2-3] [2-3] [1-2]
AMD (.25micron) K6-233,266,300 ---- 2.1V(Dual) [1-2] [2-3] [2-3] [2-3]
SP98-N Voltage Regulator Output Selection
R
VID2
VID3
VID1
2.1 Volts
VID0
VID2
VID3
VID1
2.2 Volts
VID0
VID2
VID3
VID1
2.3 Volts
VID0
VID2
VID3
VID1
2.5 Volts
VID0
3
2
1
VID2
VID3
VID1
2.7 Volts
VID0
2.8 Volts 2.9 Volts 3.0 Volts 3.1 Volts
3
2
13.2 Volts
3.3 Volts 3.4 Volts 3.5 Volts
3
2
1

ASUS SP98-N User’s Manual 17
III. INSTALLATION
Jumpers
III. INSTALLATION
Using your own VGA card on the PCI expansion slot
The motherboard’s BIOS will autodetect whether aVGAcard is installed on the PCI
expansion slot and disable or enable the onboard VGA but most operating systems
bypasses the BIOS and installs the onboard VGA through Plug and Play. The fol-
lowing VGASelection jumpers are not required under standard configurations but if
you experience any conflicts, follow the jumper settings below.
5. VGASelection (VGA_SEL, VGA_SEL1)
Thesejumpers allow you to turn the onboard VGAon or off. BIOS has automatic
Enable/Disable onboard VGA. You need to disable the onboard VGA only if
you have conflicts within your operating system.
R
Disable VGA
Enable VGA
(Default)
VGA_SEL INT_SEL
SP98-N Onboard VGA
VGA_SEL INT_SEL
VGA_SEL1 VGA_SEL1
6. VGA Interrupt Selection (INT_SEL)
These jumpers allow you to set the VGAinterrupt method. The default disables
the chipset’s internal interrupt routing. Some video capture cards may require
that the interrupt be assigned by the onboard chipset.
R
Interrupt by Chipset
(Video Capture Cards)
Interrupt Disabled
(Default)
VGA_SEL INT_SEL
SP98-N Onboard VGA Interrupt
VGA_SEL INT_SEL

18 ASUS SP98-N User’s Manual
III. INSTALLATION
System Memory
III. INSTALLATION
2. System Memory (DIMM)
Only Dual Inline Memory Modules (DIMMs) can be used with this motherboard.
Twosockets are available for 3.3Volt(powerlevel) UnbufferedSynchronousDRAMs
(SDRAM) or EDO DRAM of either 8, 16, 32, 64, or 128MB to form a memory size
between 8MB to 512MB. One side (with memory chips) of the DIMM module
takes up one Row on the motherboard.
IMPORTANT: Memory speed setup is required through “Auto Configuration” in
BIOS Chipset Features Setup.
Parity EDO DIMM (9 chips)
Non-Parity SDRAM DIMM (8 chips)
General DIMM Notes: (not true for all memory modules)
• Four possible memory chips are supported: EDO or SDRAM with and without parity.
• SDRAM chips are generally thinner with higher pin density than EDO chips.
• BIOS shows EDO or SDRAM memory on bootup screen.
• 8 chip/side modules do not support parity, only 9 chip/side modules support parity.
• Single sided modules are usually 16 or 64 MB, double sided are usually 8, 32, or 128MB.
Install memory in any combination as follows:
DIMM Location 168-pin DIMM Memory Modules Total Memory
Socket 1 (Rows 0&1) SDRAM/EDO 8, 16, 32, 64, 128MB x1
Socket 2 (Rows 2&3) SDRAM/EDO 8, 16, 32, 64, 128MB x1
Total System Memory (Max 256MB) =
ASUS DIMM Module Examples:

ASUS SP98-N User’s Manual 19
System Memory
III. INSTALLATION
DIMM Memory Installation Procedures:
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 as shown. DRAM
SIMM modules have the same pin contact on both sides. SDRAM DIMM modules
have different pint contact on each side and therefore have a higher pin density.
SP98-N 168-Pin DIMM Memory Sockets
Lock
R
20 Pins88 Pins 60 Pins
The Dual Inline Memory Module (DIMM) memory modules must be 3.3Volt Un-
buffered Synchronous DRAM (SDRAM) or Extended Data Output (EDO) . You
can identify the type of DIMM module by the illustration below:
168-Pin DIMM Notch Key Definitions (3.3V)
DRAM Key Position Voltage Key Position
Unbuffered
RFU
Buffered Reserved
3.3V
5.0V
The notch on the DIMM module will shift between left, center, or right to identify
the type and also to prevent the wrong type to be inserted into the DIMM slot on the
motherboard. You must ask your retailer for the specifications before purchasing.
Four clock signals are supported on this motherboard.
III. INSTALLATION

20 ASUS SP98-N User’s Manual
BlankLever Lock
1
SP98-N ZIF Socket 7 with Pentium MMX Processor
Notch
1
R
3. Central Processing Unit (CPU)
The motherboard provides a 321-pin ZIF Socket 7 that is backwards compatible
with ZIF Socket 5 processors. 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! Without a fan circulating air on the CPU, the CPU can overheat
and cause damage to both the CPU and the motherboard.
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
upwards to a 90-degree right angle. Insert the CPU with the correct orientation as
shown. Use the notched corner of the CPU with the white dot as your guide. The
white dot should point towards the end the of the lever. Notice that there is a blank
area where one hole is missing from that corner of the square array of pin holes and
a “1” printed on the motherboard next to that corner. Because the CPU has a corner
pin for three of the four corners, the CPU will only fit in the one orientation as
shown. The picture is for reference only; you should have a CPU fan that will cover
the face of the CPU. With the added weight of the CPU fan, no force is required to
insert the CPU. Once completely inserted, hold down on the fan and close the
socket’s lever.
IMPORTANT: You must set jumpers for “CPU to BUS Frequency Ratio” and
jumpers for “BUS Frequency Selection” depending on the CPU that you install.
III. INSTALLATION
System Processor
III. INSTALLATION