Asus TXP4-X User manual

R
TXP4-X
Pentium®ATX Motherboard
USER’S MANUAL

ASUS TXP4-X User’s Manual
2
USER’S NOTICE
Product Name: ASUS TXP4-X
Manual Revision: 1.01
Release Date: July 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 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 MERCHANTABILITYOR 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 BEENADVISED OF THE POSSIBILITY
OF SUCH DAMAGESARISING 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 and Acrobat 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.
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 RESPONSIBLITY OR LIABILITY FOR
ANYERRORSOR INACCURACIESTHATMAYAPPEARINTHISMANUAL,INCLUD-
ING THE PRODUCTS AND SOFTWARES DESCRIBED IN IT.
Copyright © 1997 ASUSTeK COMPUTER INC.All Rights Reserved.

ASUS TXP4-X User’s Manual 3
ASUS 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]
WWW: www.asus.com
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]

ASUS TXP4-X User’s Manual
4
CONTENTS
I. INTRODUCTION...........................................................................7
How this Manual is Organized ........................................................7
Item Checklist ..................................................................................7
II. FEATURES ....................................................................................8
Features of the ASUS TXP4-X Motherboard ..................................8
Introduction to ASUS TX97 Series of Motherboards ................9
The ASUS TXP4-X Motherboard ............................................ 11
III. INSTALLATION ........................................................................12
ASUS TXP4-X Motherboard Layout ............................................12
Installation Steps............................................................................14
1. Jumpers ......................................................................................14
Jumper Settings ..................................................................15
Compatible Cyrix CPU Identification ................................16
2. System Memory (SIMM & DIMM) .........................................18
SIMM Memory Installation................................................20
DIMM Memory Installation Procedures: ...........................21
3. Central Processing Unit (CPU).................................................22
4. Expansion Cards .......................................................................23
Expansion Card Installation Procedure ..............................23
Assigning IRQs for Expansion Cards.................................23
Assigning DMA Channels for ISA Cards...........................24
5. External Connectors..................................................................25
Power Connection Procedures .................................................33
IV. BIOS SOFTWARE .....................................................................34
Support Software ...........................................................................34
Flash Memory Writer Utility....................................................34
Main Menu .........................................................................35
Advanced Features Menu ...................................................35
Managing and Updating Your Motherboard’s BIOS................36

ASUS TXP4-X User’s Manual 5
CONTENTS
6. BIOS Setup ...............................................................................37
Load Defaults .....................................................................38
Standard CMOS Setup .............................................................38
Details of Standard CMOS Setup:......................................38
BIOS Features Setup ................................................................41
Details of BIOS Features Setup..........................................41
Chipset Features Setup .............................................................44
Details of Chipset Features Setup.......................................44
Power Management Setup........................................................47
Details of Power Management Setup .................................47
PNP and PCI Setup ..................................................................50
Details of PNP and PCI Setup ............................................50
Load BIOS Defaults .................................................................52
Load Setup Defaults .................................................................52
Supervisor Password and User Password ................................53
IDE HDD Auto Detection ........................................................54
Save & Exit Setup ....................................................................55
Exit Without Saving .................................................................55
Desktop Management Interface (DMI)..........................................56
Introducing the ASUS DMI Configuration Utility .............56
System Requirements .........................................................56
Using the ASUS DMI Configuration Utility ......................57
VI. ASUS PCI SCSI Cards ..............................................................59
Symbios SCSI BIOS and Drivers ..................................................59
ASUS PCI-SC200 & PCI-SC860 SCSI Cards ..............................59
Setting Up the ASUS PCI-SC200 & PCI-SC860.....................60
Setting the INTAssignment for the ASUS PCI-SC200 ...........60
Terminator Requirements for SCSI Devices............................60
Terminator Settings for theASUS PCI-SC860 ........................61
Terminator Settings for theASUS PCI-SC200 ........................61
SCSI ID Numbers for SCSI Devices .......................................62
SCSI ID Priority .......................................................................62

ASUS TXP4-X User’s Manual
6
FCC & DOC COMPLIANCE
FederalCommunications 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 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.
CanadianDepartment 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 Cana-
dian Department of Communications.

ASUS TXP4-X User’s Manual 7
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.
þThe ASUS TXP4-X motherboard
þ1 IDE ribbon cable
þ1 floppy ribbon cable
þSupport Drivers & Utilities
• Flash Memory Writer utility to update the FLASH BIOS
• Desktop Management Interface (DMI) utility
• TX patch files for Windows 95
• Readme files for descriptions and use of the files
• Technical Support Form
þThis user’s manual
¨Infrared module (optional)
¨ASUS PCI-SC200 Fast-SCSI or PCI-SC860 Ultra-Fast SCSI card (optional)
I. INTRODUCTION
I. INTRODUCTION
(Manual / Checklist)

8 ASUS TXP4-X User’s Manual
Features of the ASUS TXP4-X Motherboard
The ASUS TXP4-X is carefully designed for the demanding PC user who wants
many features in a motherboard. This motherboard:
•Intel Chipset: Features Intel’s 430TX 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 & faster), AMD-K5
™
(PR75-PR133),AMD-K6
™
(PR166 & faster).
•Versatile Memory Support: Is equipped with two DIMM sockets to support 8-
128MB 168-pin 3.3Volt SDRAM/EDO memory modules up to 256MB. Is also
equipped with 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: Is equipped with BIOS that supports auto detection of hard
drives, PS/2 mouse, and Plug and Play devices to make setup of hard drives,
expansion cards, and other devices virtually automatic.
•ISA & PCI Expansion: Provides four 16-bit ISA and four 32-bit PCI slots.
•Super Multi-I/O: Provides two high-speed UART-compatible serial ports and
one parallel port with EPP and ECP capabilities.
• 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 PCI Bus Master
IDE controller with two connectors that supports four IDE devices in two chan-
nels, supports PIO Modes 3 and 4 and Bus Master IDE DMA Mode 2, and
supports Enhanced IDE devices such as Tape Backup and CD-ROM drives.
Supports two drives of either 5.25-inch (360KB or 1.2MB) or 3.5-inch (720KB,
1.44MB, or 2.88MB) disk drives. 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 boot-up.
•Level 2 Cache: 512KB Pipelined Burst SRAM onboard.
•Optional IrDA: Supports and optional IrDA receiver/transmitter device.
•SCSI BIOS: Has firmware to support optional ASUS SCSI controller cards.
•OptionalIrDA Connector: Supports an optional infrared port module for wire-
less interface.
II. FEATURES
(Features)
II. FEATURES

ASUS TXP4-X User’s Manual 9
II. FEATURES
Introduction to ASUS TX97 Series of Motherboards
Performance
• SDRAMOptimized Performance —ASUS TX97 series of motherboards sup-
port 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 using SDRAM.
• Double the IDE Transfer Speed — ASUS TX97 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. The best of all is that this
new technology is compatible with existing ATA-2 IDE specifications so there
is no need to upgrade current hard drives or cables.
•Concurrent PCI — Concurrent PCI allows multiple PCI transfers from PCI
master busses to memory to CPU.
• ACPI Ready — ACPI (Advanced Configuration and Power Interface) is also
implemented on all ASUS 430TX series of motherboards. ACPI provide more
Energy Saving Features for the future operating systems (OS) supporting OS
Direct Power Management (OSPM) functionality. With these features imple-
mented 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 in the successor to Windows 95 must be used.
• PC ’97 Compliant — Both the BIOS and hardware levels of ASUS TX97 se-
ries 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-X User’s Manual
(This page is intentionally left blank.)

ASUS TXP4-X User’s Manual 11
The ASUS TXP4-X Motherboard
II. FEATURES
(Motherboard Parts)
Intel’s 430TX
PCIset
512KB Pipelined
Burst L2 Cache
CPU ZIF
Socket 7
3 PCI Slots
3ISA Slots
2 DIMM
Sockets
T: USB Port 1
B: USB Port 2
Programmable
Flash ROM
T: PS/2 Mouse
B: PS/2 Keyboard
T: Parallel Conn.
B: Serial Conn.
COM 1
COM 2
4 SIMM
Sockets
II. FEATURES
ISA/PCI
Shared Slot

12 ASUS TXP4-X User’s Manual
III. INSTALLATION
ASUS TXP4-X Motherboard Layout
Panel Connections
Multi-I/O (En/Dis)
M/IO
FS0
FS1
FS2
BUS FREQ
ISA Slot 3
ISA Slot 2
ISA Slot 1
ISA Slot 4
Keyboard BIOS
R
PCI Slot 1
PCI Slot 2
PCI Slot 4
PCI Slot 3
CPU ZIF Socket 7
Floppy Drives Secondary IDE Primary IDE
CR2032
3 Volt
Lithium Cell
RTC (Test/Clear)
RTCLR
FANPWR1
Infrared Con. (IrDA)
IDE
LED
FANPWR3
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)
32 32 10 10 Row
PS/2
T: Mouse
B: Keyboard
T: USB 1
B: USB 2
USB
DIMM Socket 2 (64-bit, 168-pin module) DIMM Socket 1 (64-bit, 168-pin module)
32 10 Row
VID0
VID1
VID2
CPU Voltage
VID3
CPU Fan
BF0
BF1
BF2
BUS Freq.
Board Power Input
for ATX Power Supply
256KB/512KB Onboard L2 Cache
Intel
430TX
PCIset
Intel PIIX4
PCIset
Flash ROM
for BIOS
BIOS Power
Parallel Port
COM 2 COM 1
(Motherboard Layout)
III. INSTALLATION

ASUS TXP4-X User’s Manual 13
III. INSTALLATION
Jumpers
1) M/IO p. 15 Multi-I/O Selection (Enable/Disable)
2) RTCLR p. 15 Real Time Clock RAM (Operation/Clear Data)
3) VID0, 1, 2, 3 p. 16 CPU Voltage Regulator Output Selection
4) FS0, FS1, FS2 p. 17 CPU External Clock (BUS) Frequency Selection
5) BF0, BF1, BF2 p. 17 CPU:BUS Frequency Ratio
Expansion Slots
1) System Memory p. 19 System Memory Upgrade
2) SIMM Sockets p. 20 72-Pin SIMM Memory Expansion Sockets
3) DIMM Sockets p. 21 168-Pin DIMM Memory Expansion Sockets
4) CPU ZIF Socket 7 p. 22 Central Processing Unit (CPU) Socket
5) SLOT 1, 2, 3, 4 p. 23 16-bit ISA Bus Expansion Slots
6) PCI 1,2, 3,4 p. 23 32-bit PCI Bus Expansion Slots
Connectors
1) PS2KEYBOARD p. 25 PS/2 Keyboard Connector (6-pin female)
2) PS2MOUSE p. 25 PS/2 Mouse Connector (6-pin female)
3) PRINTER p. 26 Parallel (Printer) Port Connector (25-pin female)
4) COM1, COM2 p. 26 Serial Port COM1 & COM2 (two 9-pin female)
5) FLOPPY p. 26 Floppy Drive Connector (34-pin block)
6) USB p. 27 Universal Serial BUS Ports 1 & 2 (two 4-pin female)
7) Primary / Second IDE p. 27 Primary / Secondary IDE Connector (40-pin blocks)
8) IDELED p. 28 IDE LED Activity Light (2 pins)
9) FANPWR1, 2, 3 p. 28 Chassis-1,CPU-2,PowerSupply-3FanPowerLead(3-pinblock)
10) IR p. 29 Infrared Port Module Connector (5 pins)
11) ATXPWR p. 29 ATX Motherboard Power Connector (20-pin block)
12) MSG LED (PANEL) p. 30 System Message LED (2 pins)
13) SMI (PANEL) p. 30 SMI Switch Lead (2 pins)
14) PWR SW (PANEL) p. 30 ATX Power & Soft-Off Switch Lead (2 pins)
15) RESET (PANEL) p. 30 Reset Switch Lead (2 pins)
16) PWR LED ( PANEL ) p. 30 System Power LED Lead (3 pins)
17) KEYLOCK ( PANEL ) p. 30 Keyboard Lock Switch Lead (2 pins)
18) SPEAKER (PANEL) p. 30 Speaker Output Connector (4 pins)
(Map of Board)
III. INSTALLATION

14 ASUS TXP4-X 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
jumpersettingswill be described numerically such as [----], [1-2], [2-3]fornoconnec-
tion,connectpins1&2,and connect pins 2&3 respectively. Pin 1 for our motherboards
is always on top
Pin 1
or on the left
Pin 1
when holding the motherboard with the
keyboard connector away from yourself. A “1” is written besides pin 1 on jumpers
with three pins. The jumpers will also be shown graphically 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 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!Computer motherboards, baseboards and components, such asSCSI
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 TXP4-X User’s Manual 15
III. INSTALLATION
III. INSTALLATION
(Jumpers)
Jumper Settings
1. Onboard Multi-I/O Selection (M/IO)
You can selectively disable each onboard Multi-I/O item (floppy, serial, paral-
lel, and IrDA) through the Chipset Features Setup of BIOS SOFTWARE or
disable all multi-I/O items at once with the following jumper so you can use
your own multi-I/O card.
Multi-I/O M/IO
Enable [1-2] (Default)
Disable [2-3]
R
Multi I/O Setting (Enable / Disable)
Disabled
1
2
3
M/IO
Enable (Default)
1
2
3
M/IO
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 remove theAC power , (2) Move this jumper to “Clear
Data,” (3) Move the jumper back to “Operation,” (4) Turn on your computer, (5) Hold
down <Delete> during bootup and enter BIOS setup to reenter 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 should enter BIOS to “Load Setup
Defaults”andreenteranyuserinformationafterremovingandreapplyingthisjumper.
RTC RAM RTCLR
Operation [1-2] (Default)
Clear Data [2-3] (momentarily)
R
RTC RAM (Operation / Clear Data)
Operation (Default)
RTCLR
Clear Data
RTCLR
Battery Test

16 ASUS TXP4-X User’s Manual
III. INSTALLATION
(Jumpers)
III. INSTALLATION
Compatible Cyrix CPU Identification
The only Cyrix CPU that is supported on this motherboard is
labeledCyrix 6x86 PR166+ but mustbe Revision 2.7 or later.
Look on the underside of the CPU for the serial number. The
number should read G8DC6620A or later.
3. Voltage Regulator Output Selection (VID0, 1, 2, 3)
Thesejumpersset the 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 VID3 VID2 VID1 VID0
Intel/AMD/IBM/Cyrix P54C/CS/K5/M1 3.5V(VRE) ---- [----] [2-3] [2-3] [1-2]
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 [----] [1-2] [2-3] [2-3]
R
Voltage Regulator Output Selection
1.8 Volts
VID1
VID0
VID2
1
2
3
VID3 VID1
VID0
VID2
1
2
3
VID3
VID1
VID0
VID2
1
2
3
VID3
1
2
3
1
2
3
1
2
3
1.9 Volts 2.5 Volts
2.9 Volts2.8 Volts2.7 Volts 1
2
3
1
2
3
1
2
3
3.5 V3.4 V3.2 Volts **
*
Setting these two jumpers’ VID1 to
[2-3] or [----] (removed) will result in
the same voltages, respectively.

ASUS TXP4-X User’s Manual 17
III. INSTALLATION
(Jumpers)
III. INSTALLATION
4. CPU External (BUS) Frequency Selection (FS0, FS1, FS2)
ThesejumperstelltheclockgeneratorwhatfrequencytosendtotheCPU.Theseallow
the selection of the CPU’s External frequency (or BUS Clock). The BUS Clock times
the BUS Ratio equals the CPU’s Internal frequency (the advertised CPU speed).
5. CPU to BUS Frequency Ratio (BF0, BF1, BF2)
These jumpers set the frequency ratio between the Internal frequency of the CPU
and the Externalfrequency(called the BUS Clock) within theCPU.These must be
set together with the above jumpers CPU External (BUS) Frequency Selection.
R
CPU External Clock (BUS) Frequency Selection
50MHz
FS1
1
2
3
FS0 FS2
55MHz
FS1
FS0
FS2
1
2
360MHz
FS1
FS0
FS2
1
2
366MHz
FS1
FS0
FS2
1
2
3
Complete Names:
Intel Pentium P54C, P55C-MMX
AMD K5, K6
IBM/Cyrix 6x86(M1), 6x86MX(M2) CPU : BUS Frequency Ratio
P54C/K5
P55C/K6/MX
IBM/Cyrix 6x86
3.0x(3/1)
3.0x(3/1)
4.0x(4/1)
2.5x(5/2)
2.5x(5/2)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
1.5x(3/2)
3.5x(7/2)
3.0x(3/1)
1
2
3
BF1
BF0
BF2
1
2
3
BF1
BF0
BF2
1
2
3
BF1
BF0
BF2
1
2
3
BF1
BF0
BF2
Set the jumpers by the Internal speed of the Intel, AMD, IBM, or Cyrix CPU as follows:
(BUS Freq.) (Freq. Ratio)
CPU Model Freq. Ratio BUS Freq. FS2 FS1 FS0 BF1 BF0
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] [2-3] [1-2]
Intel Pentium 166MHz 2.5x 66MHz [2-3] [1-2] [2-3] [2-3] [2-3]
Intel Pentium 150MHz 2.5x 60MHz [2-3] [2-3] [1-2] [2-3] [2-3]
Intel Pentium 133MHz 2.0x 66MHz [2-3] [1-2] [2-3] [1-2] [2-3]
Intel Pentium 120MHz 2.0x 60MHz [2-3] [2-3] [1-2] [1-2] [2-3]
Intel Pentium 100MHz 1.5x 66MHz [2-3] [1-2] [2-3] [1-2] [1-2]
Intel Pentium 90MHz 1.5x 60MHz [2-3] [2-3] [1-2] [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] [2-3] [1-2]
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 [2-3] [2-3] [1-2] [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 [2-3] [2-3] [1-2] [1-2] [1-2]
AMD-K5-PR75 75MHz 1.5x 50MHz [2-3] [2-3] [2-3] [1-2] [1-2]
IBM/Cyrix6x86MX-PR233 200MHz 3.0x 66MHz [2-3] [1-2] [2-3] [2-3] [1-2]
IBM/Cyrix6x86MX-PR200 166MHz 2.5x 66MHz [2-3] [1-2] [2-3] [2-3] [2-3]
IBM/Cyrix6x86MX-PR166 150MHz 2.5x 60MHz [2-3] [2-3] [1-2] [2-3] [2-3]
*IBM/Cyrix -PR166+ 133MHz 2.0x 66MHz [2-3] [1-2] [2-3] [1-2] [2-3]
*NOTE: Only IBM or Cyrix Rev 2.7 or later is supported on this motherboard (see preceding page).
Bootup screen will show 6x86-P166+ with the Cyrix PR166+ installed on this motherboard.

18 ASUS TXP4-X User’s Manual
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ASUS TXP4-X User’s Manual 19
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 (see motherboard layout for Row loca-
tions) 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 (DIMM’s) can be used when the SIMM sockets are
not used. Two sockets are available for 3.3Volt (power level) Unbuffered Synchro-
nous DRAMs (SDRAM) or EDO DRAM of either 8, 16, 32, 64, or 128MB to form
amemory size between 8MB to256MB. One side (with memorychips) of the DIMM
module takes up one Row on the motherboard.
IMPORTANT: Memory speed setup is required through “Auto Configuration” in
BIOS Chipset Setup of 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 specifica-
tions 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 your memory. Mixing SIMMs and DIMMs require 5.0Volt (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) =

20 ASUS TXP4-X User’s Manual
III. INSTALLATION
SIMM Memory Installation
1. The SIMM memory modules will only fit in one orientation as shown because
of a safety tab on one end of the SIMM sockets, which requires the notched end
of the SIMM memory modules.
72 Pin SIMM Sockets
1
2
3
4
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 finger tips, rock the memory module into a vertical position so that it
clicks into place.
72 Pin DRAM in SIMM Socket
Support Clip
Safety Tab (This Side Only) Mounting Hole
4. The plastic guides should go through the two mounting holes on the sides and
the support clips should snap on the other side.
5. To release the memory module, push both support clips outward and rock the
module out of the support clips.
(System Memory)
III. INSTALLATION