ASUS TXP4-X User Manual

R

TXP4-X

Pentium® A TX Motherboard

USER’S MANUAL

USER’S NOTICE

No part of this manual, including the products and softwares described in it, may be repro­duced, transmitted, transcribed, stored in a retrieval system, or translated into any language
in any form or by any means, except documentation kept by the purchaser for backup pur­poses, without the express written permission of ASUSTeK COMPUTER INC. (“ASUS”).

ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
W ARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PAR­TICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS,
EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDEN­TAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF
PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DAT A, INTERRUPTION OF BUSI­NESS AND THE LIKE), EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY
OF SUCH DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS MANUAL
OR PRODUCT.

Products and corporate names appearing in this manual may or may not be registered trade­marks or copyrights of their respective companies, and are used only for identification or
explanation and to the owners’ benefit, without intent to infringe.

• 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, contact ASUS
at http://www.asus.com.tw or through any of the means indicated on the following page.

SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FUR­NISHED FOR INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT
ANY TIME WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COM­MITMENT BY ASUS. ASUS ASSUMES NO RESPONSIBLITY OR LIABILITY FOR
ANY ERRORS OR INACCURACIES THAT MA Y APPEAR IN THIS MANUAL, INCLUD­ING THE PRODUCTS AND SOFTWARES DESCRIBED IN IT.

Copyright © 1997 ASUSTeK COMPUTER INC. All Rights Reserved.

Product Name: ASUS TXP4-X
Manual Revision: 1.01
Release Date: July 1997

2

ASUS TXP4-X User’s Manual

ASUS CONTACT INFORMATION

ASUSTeK COMPUTER INC.

Marketing Info

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

Technical Support

Fax: [phone]
BBS: [phone]
Email: [e-mail]
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: [e-mail]

Technical Support

BBS: [phone]
Email: [e-mail]
WWW: www.asus.com

ASUS COMPUTER GmbH

Marketing Info

Address: Harkort Str. 25, 40880 Ratingen, BRD, Germany
Telephone: [phone]
Fax: [phone]
Email: [e-mail]

Technical Support

BBS: 49-2102-448690
Email: [e-mail]
Hotline: [phone]

ASUS TXP4-X User’s Manual 3

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

4

ASUS TXP4-X User’s Manual

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 INT Assignment for the ASUS PCI-SC200 ...........60

Terminator Requirements for SCSI Devices ............................60

Terminator Settings for the ASUS PCI-SC860 ........................61

Terminator Settings for the ASUS PCI-SC200 ........................61

SCSI ID Numbers for SCSI Devices .......................................62

SCSI ID Priority .......................................................................62

ASUS TXP4-X User’s Manual 5

FCC & DOC COMPLIANCE

Federal Communications Commission Statement

This device complies with FCC Rules Part 15. Operation is subject to the following
two conditions:

• This device may not cause harmful interference, and

• This device must accept any interference received, including interference that
may cause undesired operation.

This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installa­tion. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with manufacturer’s instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the inter­ference by one or more of the following measures:

• Re-orient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment to an outlet on a circuit different from that to which
the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

WARNING! 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.

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.

6

ASUS TXP4-X User’s Manual

I. INTRODUCTION

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.

þ The ASUS TXP4-X motherboard
þ 1 IDE ribbon cable

I. INTRODUCTION

(Manual / Checklist)

þ 1 floppy ribbon cable
þ Support 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

þ This user’s manual
¨ Infrared module (optional)
¨ ASUS PCI-SC200 Fast-SCSI or PCI-SC860 Ultra-Fast SCSI card (optional)

ASUS TXP4-X User’s Manual 7

II. FEATURES

(Features)

II. FEATURES

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.

®

• V ersatile Processor Suppor t: Intel Pentium

P54CS), IBM®/Cyrix® 6x86-PR166+ (Rev 2.7 or later), IBM®/Cyrix® 6x86MX
(PR166 & faster), AMD-K5™ (PR75-PR133), AMD-K6™ (PR166 & faster).

• V ersatile 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.

75-233MHz (P55C-MMX™, P54C/

™

• 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 chan­nels, 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.

• Optional IrDA Connector: Supports an optional infrared port module for wire-

less interface.

8 ASUS TXP4-X User’s Manual

II. FEATURES

Introduction to ASUS TX97 Series of Motherboards

Performance

• SDRAM Optimized 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 imple­mented in the OS, PCs can be ready around the clock, yet satisfy all the energy
saving standards. To fully utilize the benefits of ACPI, an ACPI-supported OS
such as 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 pro­cedures for both Windows 95 and Windows NT.

ASUS TXP4-X User’s Manual 9

(This page is intentionally left blank.)

10 ASUS TXP4-X User’s Manual

II. FEATURES

The ASUS TXP4-X Motherboard

T: PS/2 Mouse
B: PS/2 Keyboard

T: USB Port 1
B: USB Port 2

COM 1

T: Parallel Conn.
B: Serial Conn.

COM 2
Intel’s 430TX

PCIset

4 SIMM
Sockets

2 DIMM
Sockets

CPU ZIF
Socket 7

512KB Pipelined
Burst L2 Cache

II. FEATURES

(Motherboard Parts)

3 PCI Slots

ISA/PCI
Shared Slot

3 ISA Slots

Programmable
Flash ROM

ASUS TXP4-X User’s Manual 11

III. INSTALLATION

ASUS TXP4-X Motherboard Layout

PS/2

USB

Parallel Port

(Motherboard Layout)

III. INSTALLATION

T: Mouse
B: Keyboard

T: USB 1
B: USB 2

COM 1

COM 2

FANPWR3

Row

Board Power Input

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)

DIMM Socket 2 (64-bit, 168-pin module)

DIMM Socket 1 (64-bit, 168-pin module)

for ATX Power Supply

CPU ZIF Socket 7

32

32 10 10

M/IO

Multi-I/O (En/Dis)

32

Row

10

BUS FREQ

PCI Slot 1

Intel
430TX
PCIset

FS0
FS1
FS2

BUS Freq.

CPU Voltage

VID0
VID1
VID2
VID3

CPU Fan

BF0
BF1
BF2

256KB/512KB Onboard L2 Cache

Floppy Drives

Secondary IDE

Primary IDE

PCI Slot 2

PCI Slot 3

PCI Slot 4

Keyboard BIOS

ISA Slot 1

ISA Slot 2

ISA Slot 3

ISA Slot 4

R

Intel PIIX4
PCIset

Flash ROM
for BIOS

Infrared Con. (IrDA)

Panel Connections

IDE
LED

CR2032
3 Volt
Lithium Cell

BIOS Power

FANPWR1

RTCLR

RTC (Test/Clear)

12 ASUS TXP4-X User’s Manual

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. 2 6 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, Power Supply-3 Fan Power Lead (3-pin block)

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 (

17)

KEYLOCK (

18) SPEAKER (PANEL) p. 30 Speaker Output Connector (4 pins)

PANEL)p. 30 System Power LED Lead (3 pins)

PANEL)p. 30 Keyboard Lock Switch Lead (2 pins)

(Map of Board)

III. INSTALLATION

ASUS TXP4-X User’s Manual 13

III. INSTALLATION

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 connec-

(Jumpers)

tion, connect pins 1&2, and connect pins 2&3 respectively . Pin 1 for our motherboards
is always on top
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 jump­ers 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 as 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.

Pin 1

or on the left

Pin 1

when holding the motherboard with the

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.

14 ASUS TXP4-X User’s Manual

III. INSTALLATION

Jumper Settings

1. Onboard Multi-I/O Selection (M/IO)

You can selectively disable each onboard Multi-I/O item (floppy, serial, paral­lel, 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]

M/IO

1
2
3

Disabled

R

Multi I/O Setting (Enable / Disable)

M/IO

1
2
3

Enable (Default)

2. Real Time Clock (RTC) RAM (RTCLR)

The CMOS RAM is powered by the onboard button cell battery . T o clear the R TC data:
(1) T urn off your computer and remove the AC power , (2) Move this jumper to “Clear
Data,” (3) Move the jumper back to “Operation,” (4) T urn 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 cur­rent 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” and reenter any user information after removing and reapplying this jumper .

(Jumpers)

III. INSTALLATION

RTC RAM RTCLR

Operation [1-2] (Default)
Clear Data [2-3] (momentarily)

RTCLR
Battery Test

R

Operation (Default)

RTC RAM (Operation / Clear Data)

ASUS TXP4-X User’s Manual 15

RTCLR

Clear Data

III. INSTALLATION

III. INSTALLATION

Compatible Cyrix CPU Identification

The only Cyrix CPU that is supported on this motherboard is
labeled Cyrix 6x86 PR166+ but must be 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)

These jumpers set the voltage supplied to the CPU. The voltage regulators will auto­matically detect and switch between Single Power Plane & Dual Power Planes.

(Jumpers)

Pentium MMX (P55C)
(150MHz-233MHz)

Intel Pentium (P54C)
(75MHz-200MHz)

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 V olts
AMD K6-PR233 ---- 3.2 Volts [----] [1-2] [2-3] [2-3]

VID1

VID2

R

Voltage Regulator Output Selection

VID3

1.8 Volts

VID0

1
2
3

1
2
3

1
2
3

VID1

VID2

VID3

Setting these two jumpers’ VID1 to

*

[2-3] or [----] (removed) will result in
the same voltages, respectively.

VID0

1
2
3

1.9 Volts 2.5 Volts
1

2
3

1
2
3

*

VID3

2.9 Volts2.8 Volts2.7 Volts

3.5 V3.4 V3.2 Volts

VID2

VID1

*

VID0

1
2
3

1
2
3

1
2
3

16 ASUS TXP4-X User’s Manual

III. INSTALLATION

4. CPU External (BUS) Frequency 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 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 External frequency (called the BUS Clock) within the CPU. These must be

set together with the above jumpers CPU External (BUS) Fr equency Selection.

FS1

FS0

FS2

FS2

FS1

FS0

FS2

FS1

FS0

FS2

FS1

FS0

R

Complete Names:

Intel Pentium P54C, P55C-MMX
AMD K5, K6
IBM/Cyrix 6x86(M1), 6x86MX(M2)

1
2

3

50MHz

CPU External Clock (BUS) Frequency Selection

BF2

BF1

P54C/K5
P55C/K6/MX
IBM/Cyrix 6x86

CPU : BUS Frequency Ratio

1.5x(3/2)

3.5x(7/2)

3.0x(3/1)

55MHz

BF0

1
2

3

1
2

3

BF2

BF1

2.0x(2/1)

2.0x(2/1)

2.0x(2/1)

BF0

60MHz

1
2

3

2.5x(5/2)

2.5x(5/2)

2.0x(2/1)

BF2

BF1

1
2

3

66MHz

BF0

1
2

3

3.0x(3/1)

3.0x(3/1)

4.0x(4/1)

BF2

BF1

1
2

3

BF0

1
2

3

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]

(Jumpers)

III. INSTALLATION

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/Cyrix 6x86MX-PR233 200MHz 3.0x 66MHz [2-3] [1-2] [2-3] [2-3] [1-2]
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 [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.

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18 ASUS TXP4-X User’s Manual

III. INSTALLATION

2. System Memory (SIMM & DIMM)

This motherboard supports four 72-pin, 32-bit SIMMs (Single Inline Memory Mod­ules) 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 Sym­metric), 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 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 (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
a memory size between 8MB to 256MB. 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 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 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 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)

(System Memory)

III. INSTALLATION

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-X User’s Manual 19