ASUS PI-P55T2P4S User Manual

R

P/I-P55T2P4S

Pentium Motherboard with

Ultra Fast/Wide SCSI

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 WARRANTIES 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 DA TA, 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 MAY APPEAR IN THIS MANUAL, INCLUDING THE PROD­UCTS AND SOFTWARES DESCRIBED IN IT.

Copyright © 1997 ASUSTeK COMPUTER INC. All Rights Reserved.

Adaptec-related sections/manuals: Copyright © 1997 Adaptec, Inc. All Rights Reserved.

Adaptec, the Adaptec logo, EZ-SCSI, AHA, SCSISelect and RAIDport are trademarks of Adaptec, Inc., which may be
registered in some jurisdictions.

Product Name: ASUS P/I-P55T2P4S
Manual Revision: 1.23
Release Date: May 1997

2 ASUS P/I-P55T2P4S User’s Manual

ASUS CONTACT INFORMATION

ASUSTeK COMPUTER INC.

Marketing Info:

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

Technical Support:

Fax: [phone]
BBS: 886-2-896-4667
Email: [e-mail]
WWW: http://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: 1-408-474-0555
Email: [e-mail]

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 P/I-P55T2P4S User’s Manual 3

CONTENTS

I. INTRODUCTION......................................................... 7

How this manual is organized .......................................................... 7

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

II. FEATURES ..................................................................8

Features of the ASUS P/I-P55T2P4S Motherboard ......................... 8

Parts of the ASUS Motherboard ...................................................... 9

III. INSTALLATION ........................................................ 10

Map of the ASUS Motherboard ....................................................... 10

Installation Steps .............................................................................. 12

1. Jumpers ........................................................................................ 12

Jumper Settings .................................................................... 13

TAG SRAM Upgrade ................................................................. 13

Compatible Cyrix CPU Identification .................................. 17

2. System Memory (DRAM & SRAM) .......................................... 18

DRAM Memory Installation Procedures: ............................ 19

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 Features Menu ..................................................... 33

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 .................................................................. 40

Details of BIOS Features Setup:........................................... 40

Chipset Features Setup ............................................................... 43

4 ASUS P/I-P55T2P4S User’s Manual

CONTENTS

Power Management Setup.......................................................... 46

Details of Power Management Setup: .................................. 46

PNP and PCI Setup .................................................................... 48

Load BIOS Defaults ................................................................... 50

Load Setup Defaults ................................................................... 50

Supervisor Password and User Password .................................. 51

IDE HDD Auto Detection .......................................................... 52

Save & Exit Setup ...................................................................... 53

Exit Without Saving ................................................................... 53

V. DESKTOP MANAGEMENT ...................................... 55

Desktop Management Interface (DMI)............................................ 55

Introducing the ASUS DMI Configuration Utility ............... 55

System Requirements ........................................................... 55

Using the ASUS DMI Configuration Utility ........................ 56

Notes: .................................................................................... 56

VI. ADAPTEC SCSI SELECT .........................................59

Configuring the SCSI Adapter ......................................................... 59

Configure/View Host Adapter Settings ................................ 59

SCSI Disk Utilities ..................................................................... 59

VI. ADAPTEC EZ-SCSI UTILITY ................................. 61

Quick Start Instructions ................................................................... 61

Windows95 or WindowsNT ....................................................... 61

Windows/Windows for Workgroups 3.1x .................................. 61

DOS ............................................................................................ 61

Troubleshooting Tips ....................................................................... 62

SCSI Device Troubleshooting .................................................... 62

Windows95/WindowsNT Troubleshooting ................................ 62

Information for DOS/Windows 3.1x Users ..................................... 65

DOS and Windows3.1x Device Drivers ..................................... 65

DOS and Windows3.1x ASPI Managers .................................... 65

DOS Formatting Utilities ........................................................... 66

Low-level Formatter (scsifmt) .............................................. 66

Formatter and Partitioner (afdisk) ........................................ 67

VII. ADAPTEC 7800 DRIVERS (88 Pages)

(for onboard Adaptec 7880 SCSI Chipset)

ASUS P/I-P55T2P4S 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 P/I-P55T2P4S 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
III. Installation: Instructions on setting up the motherboard
IV. BIOS Setup: BIOS software setup information
V. DMI Utility: BIOS supported Desktop Management Interface
VI. Adaptec Utility: Adaptec SCSI Select & EZ-SCSI utilities
VII. Adaptec 7800: Adaptec SCSI driver installation and usage

Item Checklist

Please check that your package is complete. If you discover damaged or missing
items, please contact your retailer.

þ The ASUS P/I-P55T2P4S motherboard

I. INTRODUCTION

(Sections/Checklist)

þ 2 serial port ribbon cables attached to a mounting bracket
þ 1 parallel ribbon cable with mounting bracket
þ 1 IDE ribbon cable
þ 1 floppy ribbon cable
þ 50-Pin Fast-SCSI cable
þ Support software (view FILELIST.TXT for contents and descriptions)

• Flash Memory Writer utility to update the FLASH BIOS

• Desktop Management Interface (DMI) utility

• Bus Master IDE Drivers for various operating systems

• Adaptec SCSI drivers and utilities

• Technical Support Form

þ This user's manual
¨ Optional PS/2 mouse cable with mounting bracket
¨ Optional infrared module
¨ Optional 68-Pin Fast&Wide-SCSI cable

¨ Optional Adaptec PCI RAIDport controller

ASUS P/I-P55T2P4S User’s Manual 7

II. FEATURES

(Features)

II. FEATURES

Features of the ASUS P/I-P55T2P4S Motherboard

The ASUS P/I-P55T2P4S is carefully designed for the demanding corporate PC
manager who wants many features in a small package for use as a workstation or
server. This motherboard:

• Intel Chipset: Features Intel’s 430HX PCIset with I/O subsystems.

• 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.

®

• V ersatile Processor Support: Intel Pentium

P54CS), IBM
(PR166 & above), AMD-K5™ (PR75–PR133), AMD-K6™ (PR166–PR233).

• Adaptec SCSI Chipset: Features Adaptec’ s 7880 Ultra-Fast/W ide SCSI Chipset.

• Error Checking and Correcting (ECC): Using Intel’ s 430HX PCIset together

with parity DRAM modules can detect multi-bit memory errors and correct 1­bit memory errors.

• 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)

®

/Cyrix® 6x86-PR166+ (Rev 2.7 or later), IBM®/Cyrix® 6x86MX

75–233MHz (P55C-MMX™, P54C/

™

• L2 Cache: Provides 512KB onboard Pipelined Burst SRAM.

• Versatile DRAM Memory Support: Supports (6) 72-pin SIMMs of 4MB,

8MB, 16MB, 32MB, or 64MB to form a memory size between 8MB to 384MB.
Supports both Fast Page Mode (FPM) and Extended Data Output (EDO) SIMMs.

• ISA and PCI Expansion Slots: Provides three 16-bit ISA slots; two 32-bit PCI

slots; one PCI/MediaBus slot, which allows the use of either a standard PCI card
or the ASUS MediaBus Card; and one PCI/RAIDport slot, which allows the use
of either a standard PCI card or Adaptec's RAIDport controller.

• ASUS MediaBus: Features an expansion slot extension shared with PCI Slot 4

for an optional high-performance expansion card, which includes two functions
in one easy-to-install card.

• RAIDport Support: Supports Adaptec’s RAIDport controller through the on-

board PCI/RAIDport slot, allowing high performance and fault-tolerant disk
storage operation of RAID technology. It is also an ideal solution for merging
several hard disks into one contiguous volume.

• Super Multi-I/O: Provides two high-speed UART compatible serial ports and

one parallel port with EPP and ECP capabilities. UART2 can also be directed
from COM2 to the Infrared Module for wireless connections. T wo floppy drives
of either 5.25” (1.2MB, 360K) or 3.5” (2.88MB, 1.44MB, 720K) are also sup­ported without an external card. Supports Japanese standard “Floppy 3 mode”

(3.5” 1.2MB) and LS-120 floppy drive (3.5” 120MB, 1.44MB, 720K).

• 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, pro­vides faster data transfer rates, and supports Enhanced IDE devices such as Tape
Backup and CD-ROM drives. This controller supports PIO Modes 3 and 4 and Bus
Master IDE DMA Mode 2. BIOS now supports IDE CD-ROM or SCSI bootup.

8 ASUS P/I-P55T2P4S User’s Manual

II. FEATURES

• 50-Pin SCSI & 68-Pin SCSI Connectors: Supports 50-Pin Ultra-Fast SCSI &

68-Pin Ultra-Wide SCSI through onboard connectors.

• Optional IrDA and PS/2 Mouse Connector: This motherboard supports an

optional infrared port module for wireless interface and a PS/2 mouse cable set.

Parts of the ASUS Motherboard

Parallel & Serial Ports

Super Multi-I/O
3 ISA Slots

3 PCI Slots
Adaptec’s 7880

Ultra-Fast/Wide
SCSI Chipset

50-Pin SCSI
68-Pin SCSI

II. FEATURES

(Parts of Board)

Floppy Conn.

PCI 4 or ASUS
MediaBus

PCI 1 or
RAIDport

IDE Connectors
Self-Powered

RealTime Clock

6 SIMM Sockets

Programmable
Flash ROM

Intel’s 430HX
PCIset

CPU ZIF
Socket 7

Upgradeable
TAG SRAM

512KB Pipelined
Burst L2 Cache

ASUS P/I-P55T2P4S User’s Manual 9

III. INSTALLATION

Map of the ASUS Motherboard

ISA Slot 3

III. INSTALLATION

(Map of Board)

Keyboard BIOS

ISA Slot 2

ISA Slot 1

PCI Slot 4

MediaBus

Super
Multi-I/O
Chipset

PCI Slot 3

PCI Slot 2

Multi-I/O (En/Dis)

Universal Serial Bus

Parallel (Printer) Port

PCI Slot 1

Adaptec 7880
SCSI Chipset

SIMM Socket 6 (Bank 2)

RAID

port

PS/2
Mouse

SIMM Socket 5 (Bank 2)

Key­board

COM 1

Serial (COM) Ports

SIMM Socket 4 (Bank 1)

COM 2

1

35

68-Pin Wide SCSI

34

68

SIMM Socket 3 (Bank 1)

SIMM Socket 2 (Bank 0)

SIMM Socket 1 (Bank 0)

50-Pin SCSI Connector

Floppy Drives

Boot Block Write

RTC Clear

Fan Pwr 1

Infrared

Fan Pwr 2

HD LED

Freq. Ratio

Case Connector

FS2
FS1

Clock Freq

BF0

BF1

CPU ZIF Socket 7

Primary IDE

TAG SRAM Upgrade

VID1

VID2

VID3

VID0

Secondary IDE

Cacheable
64/512MB

Tag SRAM

Onboard

Intel 430HX
PCIset

Board Power Input

P8

P9

Vcore Voltage

512KB Pipelined Burst L2 Cache

10 ASUS P/I-P55T2P4S User’s Manual

III. INSTALLATION

Jumpers

1) CBSIZE p. 13 Memory Cacheable Size (64MB / 512MB)

2) BBLKW p. 14 Flash ROM Boot Block Program (Disable/Enable)

3) SIO p. 14 Super Multi-I/O Selection (Enable/Disable)

4) RTCLR p. 15 Real Time Clock RAM (Operation/Clear Data)

5) FS1, FS2 p. 16 CPU External Clock (BUS) Frequency Selection

6) BF0, BF1 p. 16 CPU:BUS Frequency Ratio (1.5, 2.0, 2.5, 3.0)

7) VID p. 17 CPU Voltage Selection

Expansion Slots

1) TAG SRAM p. 13 TAG SRAM Upgrade Socket

2) SIMM Sockets p. 18 DRAM Memory Expansion Sockets

3) CPU ZIF Socket 7 p. 21 Central Processing Unit (CPU) Socket

4) ISA Slots p. 22 16-bit ISA Bus Expansion Slots

5) PCI Slots* p. 22 32-bit PCI Bus Expansion Slots

Connectors

1) KBCON p. 24 Keyboard Connector (5-pin Female)

2) PS2MOUSE p. 24 PS/2 Mouse Connector (6-pin Block)

3) PRINTER p. 25 Parallel (Printer) Port Connector (26-pin Block)

4) COM1, COM2 p. 25 Serial Port COM1 & COM2 (10-pin Blocks)

5) FLOPPY p. 26 Floppy Drive Connector (34-pin Block)

6) POWER p. 26 Motherboard Power Connector (12-pin Block)

7) Primary/Second. IDE p. 27 Primary/Secondary IDE Connectors (40-pin Blocks)

8) HDLED p. 27 SCSI/IDE Activity LED Lead

9) TB LED (PANEL) p. 28 Turbo LED/Power LED (2-pins)

10) SMI (PANEL) p. 28 SMI Switch Lead (2-pins)

11) RESET (PANEL) p. 28 Reset Switch Lead (2-pins)

12) KEYLOCK (PANEL) p. 28 Keyboard Lock Switch Lead (5-pins)

13) SPEAKER (PANEL) p. 28 Speaker Connector (4-pins)

14) FANPWR 1, 2 p. 29 12 Volt CPU Cooling Fan Connector

15) IR p. 29 Infrared Port Module Connector

16) SCSI & Wide SCSI p. 30 50-Pin SCSI and 68-Pin Wide-SCSI Connectors

17) RAID PORT p. 30 Raid Port

(Map of Board)

III. INSTALLATION

* PCI Slot 1 share the same interrupt number (INTA#) with the onboard 7880 SCSI
chipset, therefore PCI Slot 1 cannot use expansion cards which require an interrupt
number. Use the other PCI Slots first. If you need all the slots, try using your display
card on PCI Slot 1 because some display cards do not use an interrupt number.

ASUS P/I-P55T2P4S User’s Manual 11

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. Setup the BIOS Software

1. Jumpers

Several hardware settings are made through the use of jumper caps to connect jumper

III. INSTALLATION

(Jumpers)

pins (JP) on the motherboard. See "Map of the Motherboard" on page 4 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 for our motherboards is always on top
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 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 motheboards and components contain very delicate
Integrated Circuit (IC) chips. To protect the motherboard and other compo­nents 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. Hold components by the edges and try not to touch the IC chips, leads, or
circuitry.

3. Use a grounded wrist strap before handling computer 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.

Pin 1

or on the left

Pin 1

when

12 ASUS P/I-P55T2P4S User’s Manual

III. INSTALLATION

Jumper Settings

1. Memory Cacheable Size (CBSIZE)

The default of 64MB uses only the onboard T AG SRAM which allows cacheable
memory up to 64MB. If you install DRAM above 64MB and wish to allow
cacheable memory above 64MB, you need to install a TAG SRAM upgrade and
set this jumper to 512MB. See this section for “TAG SRAM Upgrade.”

Cacheable Size CBSIZE

64MB [1-2] (Default)
512MB [2-3]

CBSIZE

1
2
3

64MB Cacheable (Default)

Cacheable Size (64MB / 512MB)

CBSIZE

1
2
3

512MB Cacheable

TAG SRAM Upgrade

The purpose of this SRAM is described by "Memory Cacheable Size" jumper . Y ou
must use a standard 5Volt SRAM chip that is 15ns or faster.

Notch

Indention

Insert one 16K8 or 32K8
SRAM chip as shown by
the Top view with the semi­circle "Indention" on the
same side as the "Notch."

(Jumpers)

III. INSTALLATION

TAG SRAM Upgrade

ASUS P/I-P55T2P4S User’s Manual 13

Motherboard

Top

Side

III. INSTALLATION

2. 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 Enabled position. This is required only if
prompted by the Flash Memory Writer Utility as shown in BIOS SOFTW ARE.

Programming BBLKW

Disabled [1-2] (Default)
Enabled [2-3]

III. INSTALLATION

(Jumpers)

BBLKW

Disabled (Default) Enabled

Boot Block Programming (Disable / Enable)

BBLKW

3. Onboard Multi-I/O Selection (SIO)

You can selectively disable each onboard Multi-I/O item (floppy, serial, paral­lel, and IrDA) through Chipset Features Setup of BIOS SOFTWARE or dis­able all Multi-I/O items at once with the following jumper in order to use your
own Multi-I/O card.

Selections SIO

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

SIO

1
2
3

SIO

1
2
3

Enable (Default) Disabled

Super Multi I/O Setting (Enable / Disable)

14 ASUS P/I-P55T2P4S User’s Manual

III. INSTALLATION

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

This clears the user-entered information stored in the CMOS RAM of the Real
Time Clock such as hard disk information and passwords. To clear the RTC
data: (1) Turn off the PC, (2) Short this jumper, (3) Power on the PC, (4) Turn
off the PC, (5) Remove this jumper, (6) Power on the PC, (7) Hold down <De­lete> during bootup and enter BIOS setup to re-enter user preferences.

Selections RTCLR

Operation [open] (Default)
Clear Data [short] (momentarily)

RTCLR

Operation (Default) Clear Data

RTC RAM (Operation / Clear Data)

RTCLR

(Jumpers)

III. INSTALLATION

ASUS P/I-P55T2P4S User’s Manual 15

III. INSTALLATION

5. CPU External (BUS) Frequency Selection (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).

6. 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 above jumpers CPU External (BUS) Frequency Selection.

III. INSTALLATION

(Jumpers)

FS2
FS1

66MHz

BF0

2.5x(5/2)

2.5x(5/2)

1.0x(1/1)

123

BF1

1
2
3

123

FS2
FS1

75MHz

BF0

BF1

3.0x(3/1)

3.0x(3/1)

4.0x(4/1)

1
2
3

Complete Names:

123

FS2
FS1

50MHz

CPU External Clock (BUS) Frequency Selection

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

CPU : BUS Frequency Ratio

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

FS2
FS1

1.5x(3/2)

3.5X(7/2)

3.0x(3/1)

123

55MHz

BF0

BF1

FS2
FS1

1
2
3

123

60MHz

BF0

BF1

2.0x(2/1)

2.0x(2/1)

2.0x(2/1)

1
2
3

Set the jumpers by the Internal speed of your processor as follows:

(BUS Frequency) (Freq. Ratio)

CPU Model Freq. Ratio (BUS Freq.) FS2 FS1 BF0 BF1

Intel Pentium 233MHz 3.5x 66MHz [1-2] [2-3] [1-2] [1-2]
Intel Pentium 200MHz 3.0x 66MHz [1-2] [2-3] [1-2] [2-3]
Intel Pentium 166MHz 2.5x 66MHz [1-2] [2-3] [2-3] [2-3]
Intel Pentium 150MHz 2.5x 60MHz [2-3] [1-2] [2-3] [2-3]
Intel Pentium 150MHz 2.0x 75MHz [2-3] [1-2] [2-3] [1-2]
Intel Pentium 133MHz 2.0x 66MHz [1-2] [2-3] [2-3] [1-2]
Intel Pentium 120MHz 2.0x 60MHz [2-3] [1-2] [2-3] [1-2]
Intel Pentium 100MHz 1.5x 66MHz [1-2] [2-3] [1-2] [1-2]
Intel Pentium 90MHz 1.5x 60MHz [2-3] [1-2] [1-2] [1-2]
Intel Pentium 75MHz 1.5x 50MHz [2-3] [2-3] [1-2] [1-2]

AMD-K6-PR233 233MHz 3.5x 66MHz [1-2] [2-3] [1-2] [1-2]
AMD-K6-PR200 200MHz 3.0x 66MHz [1-2] [2-3] [1-2] [2-3]
AMD-K6-PR166 166MHz 2.5x 66MHz [1-2] [2-3] [2-3] [2-3]

AMD-K5-PR133/100 100MHz 1.5x 66MHz [1-2] [2-3] [1-2] [1-2]
AMD-K5-PR120/90 90MHz 1.5x 60MHz [2-3] [1-2] [1-2] [1-2]
AMD-K5-PR75 75MHz 1.5x 50MHz [2-3] [2-3] [1-2] [1-2]

IBM/Cyrix 6x86MX-PR233 200MHz 3.0x 66MHz [1-2] [2-3] [1-2] [2-3]
IBM/Cyrix 6x86MX-PR200 166MHz 2.5x 66MHz [1-2] [2-3] [2-3] [2-3]
IBM/Cyrix 6x86MX-PR166 150MHz 2.5x 60MHz [2-3] [1-2] [2-3] [2-3]

*IBM/Cyrix 6x86-PR166+ 133MHz 2.0x 66MHz [1-2] [2-3] [2-3] [1-2]
*NOTE: Only IBM or Cyrix Revision 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.

16 ASUS P/I-P55T2P4S User’s Manual

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.

7. Single/Dual Power Plane CPU Voltage Regulator Selections (VID 0-VID4)

The following jumpers set the voltage supplied to the CPU. Determine whether
your CPU has a Single Power Plane (SPP) or Dual Power Planes (DPP) and
then the voltage that it uses. When a single power plane CPU is installed, the dual
power plane selections will be automatically disabled. When a dual power plane
CPU is installed, the single power plane selections will be automatically disabled.

WARNING: Incorrect setting can damage your CPU. If you are not exactly
clear on CPU jumper settings, check with your retailer.

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 SPP DPP VID0 VID1 VID2 VID3 VID4

Intel/AMD/IBM/Cyrix P54C/CS/K5/6x86 3.5V(VRE) ---- [short] [-----] [-----] [-----] [-----]
AMD K6-PR166,200 ---- 2.9V

Intel/AMD P54C/CS/K5 3.4V(STD) ---- [-----] [short] [-----] [-----] [-----]
Intel/IBM/Cyrix P55C/6x86MX ---- 2.8V

AMD K6-PR233 ---- 3.2V [-----] [-----] [-----] [-----] [short]

VID4

(Default)

VID0

VID1

VID2

VID3

P55C/6x86MX
(2.8 Volts)

P54C/CS/6x86
(STD 3.4V)

VID4

VID0

VID1

VID2

K6-PR233
(3.2 Volts)

VID4

VID3

Dual Plane

Single Plane

VID0

VID1

VID2

VID3

K6-PR166,200
(2.9 Volts)

P54C/CS/K5/6x86
(VRE 3.5V)

(Jumpers)

III. INSTALLATION

CPU Vcore Voltage Selection

ASUS P/I-P55T2P4S User’s Manual 17

III. INSTALLATION

(Memory)

III. INSTALLATION

2. System Memory (DRAM & SRAM)

This motherboard supports six 72-pin SIMMs of 4MB, 8MB, 16MB, 32MB, or
64MB to form a memory size between 8MB to 256MB. The DRAM can be either
60ns or 70ns Fast Page Mode (Asymmetric or Symmetric) or EDO. To support
ECC, you must use true (opposed to phantom parity generated by logic chips) 36-bit
parity-type DRAM (e.g. 8 chips + 4 parity chips) in pairs for all modules. Mixing
32-bit non-parity DRAM (e.g. 8 chips) and 36-bit DRAM (e.g. 12 chips) will work
minus the ECC feature.

Install memory in any or all of the banks in any combination as follows:

Bank Memory Module Total Memory
Bank 0 4MB, 8MB, 16MB, 32MB, 64MB x2
SIMM Sockets 1&2 72-pin FPM, EDO SIMM

Bank 1 4MB, 8MB, 16MB, 32MB, 64MB x2
SIMM Sockets 3&4 72-pin FPM, EDO SIMM

Bank 2 4MB, 8MB, 16MB, 32MB, 64MB x2
SIMM Sockets 5&6 72-pin FPM, EDO SIMM

Total System Memory (384MB Max) =

IMPORTANT: Memory setup is required using “Auto Configuration" in
Chipset Features Setup of the BIOS SOFTWARE.

IMPORTANT: Each bank must have the same size memory installed in pairs.
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.

18 ASUS P/I-P55T2P4S User’s Manual

III. INSTALLATION

DRAM Memory Installation Procedures:

1. The SIMM memory modules will only fit in one orientation as shown because
of a "Plastic Safety Tab" on one end of the SIMM sockets which requires the
"Notched End" of the SIMM memory modules.

Notched End

123456

Bank0Bank1Bank2

72-Pin DRAM Modules

72 Pin SIMM DRAM Sockets

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.

Support Clip

Safety Tab (This Side Only)

72 Pin DRAM in SIMM Socket

Mounting Hole

4. The plastic guides should go through the two "Mounting Holes" on the sides and
the "Metal Clips" should snap on the other side.

(DRAM Memory)

III. INSTALLATION

5. To release the memory module, squeeze both "Metal Clips" outwards and rock
the module out of the "Metal Clips".

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20 ASUS P/I-P55T2P4S User’s Manual

III. INSTALLATION

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. Apply thermal jelly to the CPU top and then
install the fan onto the CPU.

WARNING: Without a fan circulating air on the CPU and heat sinks, the
CPU and/or heat sinks can overheat and cause damage to both the CPU and the
motherboard. (See "CPU Cooling Fan Connector” at the end of this section.)

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. W ith 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.

(CPU)

III. INSTALLATION

IMPORTANT: You must set jumpers for "CPU to BUS Frequency Ratio" and
jumpers for "BUS Frequency Selection" depending on the CPU that you install.

Lever
Lock

Blank

1

White Dot

1

ZIF Socket 7 with Pentium Processor

ASUS P/I-P55T2P4S User’s Manual 21