Asus TXP4 User manual

R
TXP4
Pentium®Motherboard
USER’S MANUAL

2 ASUS TXP4 User’s Manual
Product Name: ASUS TXP4
Manual Revision: 1.00
Release Date: May 1997
No part of this manual, including the products and softwares 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 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 TO THE IMPLIED WARRANTIES OR CONDITIONS OF MER-
CHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIREC-
TORS, OFFICERS, EMPLOYEES ORAGENTS BE LIABLE FORANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS, LOSS OF BUSINESS, LOSS
OF USE OR DATA, INTERRUPTION OF BUSINESSAND THE LIKE), EVEN IFASUS HAS BEENADVISED OF
THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS MANUAL OR
PRODUCT.
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 andAcrobat are registered trademarks of Adobe Systems Incorporated.
The product name and revision number are both printed on the board itself. Manual revisions
are released for each board 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.
Forprevious 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.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUALARE FURNISHED FOR INFORMA-
TIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE, AND SHOULD
NOT BE CONSTRUEDASACOMMITMENT BYASUS.ASUSASSUMES NO RESPONSIBLITY OR LIABILITY
FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS MANUAL, INCLUDING THE PROD-
UCTS AND SOFTWARES DESCRIBED IN IT.
Copyright © 1997 ASUSTeK COMPUTER INC. All Rights Reserved.
USER’S NOTICE

ASUS TXP4 User’s Manual 3
CONTACT INFORMATION
ASUSTeK COMPUTER INC.
Marketing Info:
Address: 150 Li-Te Road, Peitou, Taipei, Taiwan 112, ROC
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support:
Fax: [phone]
BBS: [phone]
Email: [email protected]
WWW: www.asus.com.tw
Gopher: gopher.asus.com.tw
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER INTERNATIONAL
Marketing Info:
Address: 721 Charcot Avenue, San Jose, CA 95131, USA
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support:
BBS: [phone]
Email: [email protected]
ASUS COMPUTER GmbH
Marketing Info:
Address: Harkort Str. 25, 40880 Ratingen, BRD, Germany
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support:
BBS: 49-2102-448690
Email: [email protected]
Hotline: [phone]

4 ASUS TXP4 User’s Manual
CONTENTS
I. INTRODUCTION............................................................................ 7
How this Manual is Organized ........................................................ 7
Item Checklist .................................................................................. 7
II. FEATURES ..................................................................................... 8
Features of the ASUS TXP4 Motherboard ...................................... 8
Introduction to ASUS TXP4 Series of Motherboards................ 9
The ASUS TXP4 Motherboard........................................................ 11
III. INSTALLATION .......................................................................... 12
ASUS TXP4 Motherboard Layout .................................................. 12
Installation Steps.............................................................................. 14
1. Jumpers ........................................................................................ 14
Jumper Settings .................................................................... 15
Compatible Cyrix CPU Identification .................................. 16
2. System Memory (SIMM & DIMM) ............................................ 18
SIMM Installation ................................................................ 19
DIMM Installation................................................................ 20
3. Central Processing Unit (CPU).................................................... 21
4. Expansion Cards .......................................................................... 22
Expansion Card Installation Procedure ................................ 22
Assigning IRQs for Expansion Cards................................... 22
Assigning DMA Channels for ISA Cards............................. 23
5. External Connectors..................................................................... 24
Power Connection Procedures ................................................... 31
IV. BIOS SOFTWARE ....................................................................... 32
Support Software ............................................................................. 32
Flash Memory Writer Utility ........................................................... 32
Main Menu ........................................................................... 32
Advanced Feature 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

ASUS TXP4 User’s Manual 5
CONTENTS
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
Details of PNP and PCI Setup .............................................. 46
Load BIOS Defaults ................................................................... 48
Load Setup Defaults ................................................................... 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 the ASUS PCI-SC860 .......................... 57
Terminator Settings for the ASUS PCI-SC200 .......................... 57
SCSI ID Numbers for SCSI Devices ......................................... 58
SCSI ID Priority ......................................................................... 58
VII. ASUS I-A16C Audio Card ......................................................... 59
ASUS I-A16C Audio Features ................................................... 59
Unpacking and Handling Precautions ........................................ 59
Layout and Connectors .............................................................. 60
Connectors ............................................................................ 60
CD-Audio Connector Pin Definitions ........................................ 60

6 ASUS TXP4 User’s Manual
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 installa-
tion. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with manufacturer’s instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interfer-
ence by one or more of the following measures:
• Re-orient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
WARNING: The use of shielded cables for connection of the monitor to the graph-
ics card is required to assure compliance with FCC regulations. Changes or modifi-
cations to this unit not expressly approved by the party responsible for compliance
could void the user’s authority to operate this equipment.
Canadian Department of Communications Statement
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus set out in the Radio Interference Regulations of the Canadian
Department of Communications.

ASUS TXP4 User’s Manual 7
I. INTRODUCTION
I. INTRODUCTION
(Sections/Checklist)
How this Manual is Organized
I. Introduction Contents and checklist
II. Features Product information and specifications
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 Card Installation of an optional ASUS SCSI card
VII.ASUS I-A16C Audio Card Installation of an optional 16-bit audio card
Item Checklist
Check that your package is complete. If you discover damaged or missing items,
contact your retailer.
þASUS TXP4 motherboard
þ2 serial port ribbon cables with mounting brackets
þ1 parallel ribbon cable with mounting bracket
þ1 IDE ribbon cable
þ1 floppy disk ribbon cable
þASUS TXP4 Support Disc
• Flash Memory Writer utility to update the FLASH BIOS
• Desktop Management Interface (DMI) utility
• Audio drivers and utilities (included with ASUS I-A16C audio bundle)
• Readme files for descriptions and use of the files
• Technical Support Form
þUser’s Manual (Audio section included with ASUS I-A16C audio bundle)
¨USB, PS/2 mouse, and IR cable with mounting bracket set (optional)
¨ASUS PCI-SC200 Fast-SCSI or PCI-SC860 Ultra-Fast SCSI card (optional)
¨ASUS I-A16C audio card (optional)

8 ASUS TXP4 User’s Manual
II. FEATURES
(ASUSTXP4)
II. FEATURES
Features of the ASUS TXP4 Motherboard
TheASUS TXP4 motherboard is carefully designed for the demanding PC user who
wants many features in a small package, namely:
•Intel Chipset: Features Intel’s 430HX PCIset with I/O subsystems.
•VersatileProcessorSupport: Intel Pentium
®
75–233MHz(P55C-MMX
™
,P54C/
P54CS), IBM
®
/Cyrix
®
6x86-PR166+ (Rev 2.7 or later), IBM
®
/Cyrix
®
6x86MX
™
(PR166 & above),AMD-K5
™
(PR75–PR133), AMD-K6
™
(PR166–PR233).
•Versatile Memory Support: Equipped with two DIMM sockets to support 8–
128MB 168-pin 3.3-Volt SDRAM/EDO memory modules up to 256MB or four
SIMM sockets to support 4–64MB 72-pin Fast Page Mode (FPM) or Extended
Data Out (EDO) memory modules up to 256MB. SIMMs and DIMMs cannot be
used at the same time.
•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.
•Dual Power Supply: Includes both AT and ATX power connectors onboard to
support an AT or ATX power supply with soft-on/soft-off features.
•ISA and PCI Expansion Slots: Provides two 16-bit ISA slots, three 32-bit PCI
slots, and one PCI/ISA shared slot for either a PCI or ISA card.
•Super Multi-I/O: Provides two high-speed UART-compatible serial ports and
one parallel port with EPP and ECP capabilities. Includes integrated keyboard
controller. Supports two of either 5.25- or 3.5-inch disk drives (1.44MB or
2.88MB) without an external card. Supports Japanese standard “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).
• 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: Comes with an onboard Ultra DMA/33 Bus
Master IDE controller with two connectors. Supports four IDE devices more
than 8.4GB in two channels up to 33MB/sec IDE transfers and Enhanced IDE
devices. Also supports PIO Modes 3 and 4 and Bus Master IDE DMA Mode 2.
BIOS supports IDE CD-ROM or SCSI device bootup.
•Level 2 Cache: Comes with onboard 512K Pipelined Burst SRAM.
•Optional PS/2 Mouse, USB, IrDA Connector: Supports an optional cable and
bracket set to connect it to an unused expansion slot on the system chassis. A
second IrDA connector is available for a standard infrared cable set.
•Symbios SCSI BIOS: Supports optional ASUS SCSI controller card through
onboard firmware.
•AudioReady:Supports optional onboard Creative Labs
®
Audio with 3D sound.
•OptionalIrDAConnector:Supports an optional infrared port module for wire-
less interface.

ASUS TXP4 User’s Manual 9
II. FEATURES
II. FEATURES
(TXP4 Series)
Introduction to ASUS TXP4 Series of Motherboards
Performance
• SDRAM Optimized Performance: The ASUS TXP4 series of motherboards
support the new generation memory—Synchronous Dynamic Random Access
Memory (SDRAM)—which increases the data transfer rate from 264MB/s max
using EDO memory to 528MB/s max.
• Double the IDE Transfer Speed: ASUS TXP4 series of motherboards with
Intel 430TX PCIset improves IDE transfer rate using Bus Master UltraDMA/33
IDE, which can handle data transfers up to 33MB/s. This new technology is
compatible with existing ATA-2 IDE specifications so there is no need to up-
grade current hard disk drives or cables.
•Concurrent PCI: Concurrent PCI allows multiple PCI transfers from PCI mas-
ter busses to memory to CPU.
• ACPIReady:ACPI(AdvancedConfiguration and Power Interface)is also imple-
mented on all ASUS 430TX series of motherboards. ACPI provides more En-
ergy Saving Features for future operating systems (OS) supporting OS Direct
Power Management (OSPM) functionality. With these features implemented in
the OS, PCs can be ready around-the-clock, yet satisfy all the energy saving
standards. To fully utilize the benefits ofACPI, anACPI-supported OS, such as
the successor to Windows 95, must be used.
• PC ’97 Compliant: Both the BIOS and hardware levels of ASUS TXP4 series
of motherboards meet PC ’97 compliancy. The new PC ’97 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 pro-
cedures for both Windows 95 and Windows NT.

10 ASUS TXP4 User’s Manual
(This page was intentionally left blank)

ASUS TXP4 User’s Manual 11
The ASUS TXP4 Motherboard
II. FEATURES
II. FEATURES
(ASUSTXP4)
CPU ZIF
Socket 7
Serial, Parallel, Floppy
Intel’s 430TX
PCIset
2 DIMM Sockets
USB, PS/2 Mouse, Infrared
Switching Voltage Regulators
4 SIMM Sockets
512KB Pipelined Burst L2 Cache
AT Power
Connector
Keyboard
Programmable
Flash ROM
ATX Power
Connector
IDE Connectors
1 ISA/PCI
Shared Slot
3 PCI Slots
2ISASlots
Super Multi I/O

12 ASUS TXP4 User’s Manual
III. INSTALLATION
ASUS TXP4 Motherboard Layout
(Motherboard Layout)
III. INSTALLATION
Power Fan
ATX Power Input
Serial Ports
Panel Connectors
CPU ZIF Socket 7
Intel
PIIX4
PCIset
Secondary IDE Primary IDE
Super Multi-I/O
Flash BIOS
512KB Pipelined Burst L2 Cache
Intel
430TX
PCIset
USB, PS/2 Mouse,
IrDA
Clock Freq
IDE LED Switching Voltage Regulators
Freq. Ratio
AT Power Input
P8
P9
CR2032 3Volts
Lithium Cell
BIOS Power
01
Floppy Drives
Parallel Port
CPU Fan
SIMM Socket 1 (32-bit, 72-pin module) SIMM Socket 2 (32-bit, 72-pin module) SIMM Socket 3 (32-bit, 72-pin module) SIMM Socket 4 (32-bit, 72-pin module)
01 23 23 Row
PCI Slot 1 PCI Slot 2 PCI Slot 3 PCI Slot 4
Key-
board
ISA Slot 3 ISA Slot 2 ISA Slot 1
R
FS1 FS0
FS2
CPU Voltage
VID0
VID1
VID2
BF0 BF1
BF2
BBLKW
RTCLR
DIMM Socket 1 (64-bit, 168-pin module) DIMM Socket 2 (64-bit, 168-pin module)
01 23 Row
Infrared
Chassis Fan
COM 2
COM 1

ASUS TXP4 User’s Manual 13
III. INSTALLATION
Jumpers
1) BBLKW p. 15 Flash ROM Boot Block Programming
2) RTCLR p. 15 RealTimeClock RAM(KeepCMOS/ClearCMOS)
3) VID0, VID1, VID2 p. 16 CPU Voltage Output Selection
4) FS0, FS1, FS2 p. 16 CPU External Frequency (BUS) Selection
5) BF0, BF1 p. 16 CPU to BUS Frequency Ratio
Expansion Slots
1) System Memory p. 18 System Memory (SIMM & DIMM)
2) SIMM1,SIMM2,SIMM3, SIMM4 p. 19 72-Pin SIMM Sockets
3) DIMM1, DIMM2 p. 20 168-Pin DIMM Sockets
4) CPU p. 21 Central Processing Unit (CPU) Socket
5) PCI1, PCI2, PCI3, PCI4 p. 22 32-bit PCI Bus Expansion Slots
6) SLOT1, SLOT2, SLOT3 p. 23 16-bit ISA Bus Expansion Slots
Connectors
1) KB p. 24 Keyboard Connector (5-pin female)
2) FLOPPY p. 24 Floppy Disk Drive Connector (34-pin block)
3) PRINTER p. 25 Parallel Port Connector (26-pin block)
4) COM1, COM2 p. 25 Serial Port Connectors (10-pin blocks)
5) PWR_FAN,CPU_FAN,CHA_FAN p. 26 Power Supply, CPU & Chassis Fan Power Leads
6) PRIMARYIDE,SECONDARYIDE p. 26 Primary/Secondary IDEConnectors (40-pin blocks)
7) MSG.LED (PANEL) p. 27 Message LED Lead (2 pins)
8) SMI (PANEL) p. 27 SMI Suspend Switch Lead (2 pins)
9) PWR.SW (PANEL) p. 27 ATXPowerSwitch/SoftPowerSwitchLead(2pins)
10) RESET (PANEL) p. 27 Reset Switch Lead (2 pins)
11)
PWR.LED (PANEL) p. 27 System Power LED Lead (3 pins)
12)
KEYLOCK (PANEL) p. 27 Keyboard Lock Switch Lead (2 pins)
13) SPEAKER (PANEL) p. 27 Speaker Output Connector (4 pins)
14) USB/MIR p. 28 USB,PS/2Mouse,InfraredModuleConnector(18-pinblock)
15) IR p. 28 SecondInfraredPortModuleConnector(5-pinblock)
16) PS/2 PWR CON. p. 29 AT Power Supply Connector (12-pin block)
17) ATX PWR CON. p. 29 ATX Power Supply Connector (20-pin block)
18) IDELED p. 30 IDEActivity LED
(Motherboard Layout)
III. INSTALLATION

14 ASUS TXP4 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 DRAM Modules
3. Install the Central Processing Unit (CPU)
4. Install Expansion Cards
5. Connect Ribbon Cables, Cabinet Wires, and Power Supply
6. Set Up the BIOS Software
1. Jumpers
Several hardware settings are made through the use of jumper caps to connect the
jumper pins on the motherboard. See layout of motherboard on page 12 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.
Pin 1 is always on top
Pin 1
or on the left
Pin 1
when holding the motherboard with
the keyboard connector away from you. A “1” is written beside pin 1 on jumpers
with three pins. The jumpers will also be shown graphically 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 jump-
ers may be sharing pins from other groups. Use the diagrams in this manual instead
of following the pin layout on the board. Settings 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 diagramed.
WARNING!Computermotherboards andcomponents,such assound cards,con-
tain 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
circuitry.
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 TXP4 User’s Manual 15
III. INSTALLATION
Jumper Settings
1. Flash ROM Boot Block Programming (BBLKW)
This sets the operation mode of the boot block area of the Programmable Flash ROM
to allow programming in the Boot Block Write Enable position. This is required only
if prompted by the Flash Memory Writer Utility (see BIOS SOFTWARE).
Boot Block Programming
Boot Block
Write-Protect
(Default)
BBLKW
Boot Bock
Write Enable
BBLKW
R
2. Real Time Clock (RTC) RAM (RTCLR)
The CMOS RAM is powered by the onboard button cell battery. To clear the
RTC data: (1) Turn off your computer and unplug the AC power, (2) Move this
jumper to Clear CMOS, (3) Move the jumper back to Keep CMOS, (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 this jumper and attaching a cur-
rent meter to pins 1 & 2.
WARNING! You must unplug the power cord to your power supply to ensure
that there is no power to your motherboard. The CMOS RAM containing BIOS
setup information may be cleared by this action.You must enter BIOS to “Load
Setup Defaults” and re-enter any user information after removing and reapply-
ing this jumper.
RTC RAM
Clear CMOS
RTCLR
Keep CMOS (Default)
RTCLR
Battery Test
R
III. INSTALLATION
(Jumpers)
RTC RAM RTCLR
Keep CMOS [1-2] (Default)
Clear CMOS [2-3] (momentarily)
Programming BBLKW
Boot Block Write-Protect [1-2] (Default)
Boot Block Write Enable [2-3]

16 ASUS TXP4 User’s Manual
III. INSTALLATION
(Jumpers)
III. INSTALLATION
Compatible Cyrix CPU Identification
The only Cyrix processor that is supported on this motherboard
is labeled Cyrix 6x86-P166+, which should be Revision 2.7 or
later. Look on the underside of the CPU for the serial number,
which should read G8DC6620A or later.
3. CPU Voltage Output Selection (VID0, VID1, VID2)
Thesejumperssetthe voltage supplied to the CPU.The voltage regulators will auto-
matically detect and switch between Single Power Plane & Dual Power Planes.
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)
Manufacturer CPU Type Single Plane Dual Plane VID0 VID1 VID2
AMD K6-PR266 ---- 2.0 Volts [----] [2-3] [----]
Intel/AMD/IBM/Cyrix P54C/CS/K5/6x86 3.5V(VRE) ---- [1-2] [2-3] [2-3]
AMD K6-PR166,200 ---- 2.9 Volts
Intel/AMD P54C/CS/K5 3.4V(STD) ---- [2-3] [2-3] [2-3]
Intel/IBM/Cyrix P55C/6x86MX ---- 2.8 Volts
AMD K6-PR233 ---- 3.2 Volts [2-3] [2-3] [1-2]
CPU Vcore Voltage Selection
Dual Plane K6-266
(2.0Volts)
1
2
3
P55C/MX
(2.8Volts)
VID 0 VID 1 VID 2
1
2
3
VID 0 VID 1 VID 2
K6-166/200
(2.9Volts)
1
2
3
VID 0 VID 1 VID 2
P54C/CS/6x86
(3.5V) (VRE)
P54C/CS/K5
(3.4V) (STD)
Single Plane
K6-233
(3.2Volts)
1
2
3
VID 0 VID 1 VID 2
R
4. CPU External Frequency (BUS) Selection (FS0, FS1, FS2)
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 multi-
pliedbytheBUSRatioequalstheCPU’sinternalfrequency(theadvertisedCPUspeed).
5. CPU to BUS Frequency Ratio (BF0, BF1)
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 jumpers for CPU External (BUS) Frequency Selection.

ASUS TXP4 User’s Manual 17
III. INSTALLATION
(Jumpers)
III. INSTALLATION
R
Complete Names:
Intel Pentium P54C, P55C-MMX
AMD K5, K6
IBM/Cyrix 6x86, 6x86MX
CPU External Clock (BUS) Frequency Selection
BF0
BF1
BF0
BF1
BF0
BF1
BF0
BF1
1
2
3
1
2
3
1
2
3
1
2
3
66MHz
FS1
1
2
3
FS2 FS0
60MHz
FS1
1
2
3
FS2 FS0
50MHz
FS1
1
2
3
FS2 FS0
1
2
3
55MHz
FS1
FS2
FS0
75MHz
FS1
1
2
3
FS2 FS0
CPU : BUS Frequency Ratio
P54C/K5
P55C/K6/MX
IBM/Cyrix6x86
3.0x(3/1)
3.0x(3/1)
4.0x(4/1)
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
1.5x(3/2)
3.5X(7/2)
3.0x(3/1)
Set the jumpers according to the internal speed of your processor as follows:
CPU Model Freq. Ratio BUS Freq. FS0 FS1 FS2 BF0 BF1
Intel Pentium 233MHz 3.5x 66MHz [2-3] [1-2] [2-3] [1-2] [1-2]
Intel Pentium 200MHz 3.0x 66MHz [2-3] [1-2] [2-3] [1-2] [2-3]
Intel Pentium 166MHz 2.5x 66MHz [2-3] [1-2] [2-3] [2-3] [2-3]
Intel Pentium 150MHz 2.5x 60MHz [1-2] [2-3] [2-3] [2-3] [2-3]
Intel Pentium 150MHz 2.0x 75MHz [1-2] [2-3] [2-3] [2-3] [1-2]
Intel Pentium 133MHz 2.0x 66MHz [2-3] [1-2] [2-3] [2-3] [1-2]
Intel Pentium 120MHz 2.0x 60MHz [1-2] [2-3] [2-3] [2-3] [1-2]
Intel Pentium 100MHz 1.5x 66MHz [2-3] [1-2] [2-3] [1-2] [1-2]
Intel Pentium 90MHz 1.5x 60MHz [1-2] [2-3] [2-3] [1-2] [1-2]
Intel Pentium 75MHz 1.5x 50MHz [2-3] [2-3] [2-3] [1-2] [1-2]
AMD-K6-PR233 233MHz 3.5x 66MHz [2-3] [1-2] [2-3] [1-2] [1-2]
AMD-K6-PR200 200MHz 3.0x 66MHz [2-3] [1-2] [2-3] [1-2] [2-3]
AMD-K6-PR166 166MHz 2.5x 66MHz [2-3] [1-2] [2-3] [2-3] [2-3]
AMD-K5-PR133 100MHz 1.5x 66MHz [2-3] [1-2] [2-3] [1-2] [1-2]
AMD-K5-PR120 90MHz 1.5x 60MHz [1-2] [2-3] [2-3] [1-2] [1-2]
AMD-K5-PR100 100MHz 1.5x 66MHz [2-3] [1-2] [2-3] [1-2] [1-2]
AMD-K5-PR90 90MHz 1.5x 60MHz [1-2] [2-3] [2-3] [1-2] [1-2]
AMD-K5-PR75 75MHz 1.5x 50MHz [2-3] [2-3] [2-3] [1-2] [1-2]
IBM/Cyrix 6x86MX-PR233 200MHz 3.0x 66MHz [2-3] [1-2] [2-3] [1-2] [2-3]
IBM/Cyrix 6x86MX-PR200 166MHz 2.5x 66MHz [2-3] [1-2] [2-3] [2-3] [2-3]
IBM/Cyrix 6x86MX-PR166 150MHz 2.5x 60MHz [1-2] [2-3] [2-3] [2-3] [2-3]
*IBM/Cyrix 6x86-PR166+ 133MHz 2.0x 66MHz [2-3] [1-2] [2-3] [2-3] [1-2]
*NOTE: Only IBM or Cyrix Rev 2.7 or later is supported on this motherboard (see next page). Bootup
screen will show 6x86-P166+ with the Cyrix PR166+ installed on this motherboard.
(BUS Freq.) (Freq. Ratio)

18 ASUS TXP4 User’s Manual
III. INSTALLATION
(System Memory)
III. INSTALLATION
2. System Memory (SIMM & DIMM)
This motherboard supports four 72-pin, 32-bit SIMMs (Single Inline Memory Mod-
ules) of 4, 8, 16, 32, or 64MB to form a memory size between 8MB to 256MB. The
SIMMs can be either 60ns or 70ns Fast Page Mode (FPM) (Asymmetric or Sym-
metric), or Enhanced Data Out (EDO) (BEDO & Parity are not supported). SIMMs
must be installed in pairs so that each Row (refer to motherboard layout for Row
locations) contains 64-bits of the same size and type of memory chips. One side
(with memory chips) of the SIMM module takes up half a Row on the motherboard.
Dual Inline Memory Modules (DIMMs) can be used when the SIMM sockets are
not used. Two sockets are available for 3.3-volt (power level) unbuffered Synchro-
nous DRAMs (SDRAM) or EDO DRAM of either 8, 16, 32, 64, or 128MB to form
a memory size between 8MB and 256MB. One side (with memory chips) of the
DIMM module takes up one Row on the motherboard.
IMPORTANT: Memory speed is set up through “Auto Configuration” in the BIOS
Chipset Setupof the BIOS SOFTWARE. If both 60ns and 70ns memory are used, set
“Auto Configuration” to 70ns. Do not use memory modules with more than 24 chips
per module. Modules with more than 24 chips exceed the design specifications of the
memory subsystem and will be unstable.
Memory Socket SIMM Memory Module Total Memory
SIMM Sockets 1&2 4MB, 8MB, 16MB, 32MB, 64MB x2
(Rows 0 & 1) 72-pin FPM or EDO SIMM
(DIMM Sockets must be empty)
SIMM Sockets 3&4 4MB, 8MB, 16MB, 32MB, 64MB x2
(Rows 2 & 3) 72-pin FPM or EDO SIMM
(DIMM Sockets must be empty)
Total System Memory (Max 256MB) =
WARNING! DO NOT install both SIMMs and DIMMs at the same time or else
you will burn the memory chips. Mixing SIMMs and DIMMs require 5.0-volt
(signal level) tolerant memory chips, which are currently unavailable.
Memory Socket DIMM Memory Module Total Memory
DIMM Socket 1 8MB, 16MB, 32MB, 64MB, 128MB x1
(Rows 0 & 1) 168-pin SDRAM or EDO DIMM
(SIMM Sockets must be empty)
DIMM Socket 2 8MB, 16MB, 32MB, 64MB, 128MB x1
(Rows 2 & 3) 168-pin SDRAM or EDO DIMM
(SIMM Sockets must be empty)
Total System Memory (Max 256MB) =

ASUS TXP4 User’s Manual 19
III. INSTALLATION
(System Memory)
III. INSTALLATION
SIMM Installation
1. The SIMM memory modules will fit in only one orientation as shown because
the plastic safety tab on one end of the SIMM sockets requires the notched end
of the SIMM memory modules.
72-Pin SIMM Sockets
1234
Notched End
R
2. Press the memory module firmly into place starting from a 45-degree angle,
making sure that all the contacts are aligned with the socket.
3. With your fingertips, rock the memory module into a vertical position so that it
clicks into place. The plastic guides should go through the two mounting holes
and the metal clips should snap.
72 Pin DRAM in SIMM Socket
Support Clip
Safety Tab (This Side Only) Mounting Hole
To release the memory module, squeeze both metal clips outward and rock the
module out of the metal clips

20 ASUS TXP4 User’s Manual
III. INSTALLATION
(System Memory)
III. INSTALLATION
DIMM Installation
Insert the modules as shown. Because the number of pins are different on either side
of the breaks, the modules will only fit in the orientation as shown. SIMM modules
have the same pin contacts on both sides. DIMM modules are longer and have dif-
ferent pin contacts on each side and therefore have a higher pin density.
168-Pin DIMM Sockets
R
Lock
88 Pins
60 Pins
20 Pins
12
Use only 3.3-volt unbuffered DIMMs. The notch in the DIMM module will shift
between left, center, or right to identify the type and also to prevent the wrong type of
DIMM from beinginserted into theDIMM socket (see illustration below). Fourclock
signals are supported on this motherboard. Ask your retailer for the specifications
before purchasing memory modules.
168-Pin DIMM Notch Key Definitions (3.3V)
DRAM Key Position Voltage Key Position
Unbuffered
RFU
Buffered Reserved
3.3V
5.0V