Asus P I-P55SP4V User manual

R
P/I-P55SP4V Motherboard
USER'S MANUAL

ASUS P/I-P55SP4V User's Manual
II
USER'S NOTICE
Product Name: P/I-P55SP4V
Manual Revision: 1.72
Release Date: December 1996
No part of this product, including the product and software may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any lan-
guageinanyformbyanymeanswithouttheexpresswrittenpermissionofASUSTeK
COMPUTER INC. (hereinafter referred to as ASUS) except documentation kept
by the purchaser for backup purposes.
ASUS provides this manual "as is" without warranty of any kind, either express or
implied, including but not limited to the implied warranties or conditions of mer-
chantability or fitness for a particular purpose. In no event shallASUS be liable for
any loss or profits, loss of business, loss of use or data, interruption of business, or
for indirect, special, incidental, or consequential damages of any kind, even ifASUS
has been advised of the possibility of such damages arising from any defect or error
in this manual or product. ASUS may revise this manual from time to time without
notice.
Products mentioned in this manual are mentioned for identification purposes only.
Product names appearing in this manual may or may not be registered trademarks
or copyrights of their respective companies.
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 updated BIOS, drivers, or prod-
uctreleaseinformationyoumay visitASUS' home page at: http://www.asus.com.tw/
© Copyright 1996 ASUSTeK COMPUTER INC. All rights reserved.

ASUS P/I-P55SP4V User's Manual III
ASUS CONTACT INFORMATION
ASUSTeK COMPUTER INC.
Marketing Info:
Address: 150 Li-Te Road, Peitou, Taipei, Taiwan, ROC
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support:
Fax: [phone]
BBS: 886-2-896-4667
Email: [email protected]
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: [email protected]
Technical Support:
BBS: 1-408-474-0569
Email: [email protected]
ASUS COMPUTER GmbH
Marketing Info:
Address: Harkort Str. 25, 40880 Ratingen, BRD, Germany
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support:
BBS: 49-2102-448690
Email: [email protected]

ASUS P/I-P55SP4V User's Manual
IV
CONTENTS
I. INTRODUCTION................................................................ 1
How this manual is organized ..................................................................... 1
Item Checklist ............................................................................................. 1
Features of This Motherboard ..................................................................... 2
II. FEATURES ......................................................................... 2
Parts of the Motherboard............................................................................. 3
III. INSTALLATION ............................................................... 4
Map of the Motherboard ............................................................................. 4
Jumpers........................................................................................... 5
Expansion Slots .............................................................................. 5
Connectors ...................................................................................... 5
Installation Steps ......................................................................................... 6
1. Jumpers ................................................................................................... 6
Jumper Settings .............................................................................. 7
Cyrix CPU Identification.............................................................. 11
2. System Memory (DRAM & SRAM) ................................................... 12
DRAM Memory Installation Procedures: .................................... 13
3. Central Processing Unit (CPU) ............................................................ 15
4. Expansion Cards................................................................................... 16
Expansion Card Installation Procedure: ....................................... 16
Assigning IRQs for Expansion Cards........................................... 16
Assigning DMA Channels for ISA Cards..................................... 17
ASUS MediaBus Card.................................................................. 18
5. External Connectors ............................................................................. 19
Power Connection Procedures...................................................... 25
Support Software ................................................................................ 25
The Flash Memory Writer Utility Screen: .................................... 26
IV. BIOS SOFTWARE .......................................................... 26
Flash Memory Writer Utility..................................................................... 26
6. BIOS Setup........................................................................................... 29
Load Defaults ............................................................................... 30
Standard CMOS Setup ........................................................................ 30
Details of Standard CMOS Setup:................................................ 31
BIOS Features Setup........................................................................... 34
Details of BIOS Features Setup:................................................... 34
Chipset Features Setup........................................................................ 37
Details of Chipset Features Setup: ............................................... 37
Power Management Setup .................................................................. 39
Details of Power Management Setup: .......................................... 40
PNP and PCI Setup ............................................................................. 42
Details of PNP and PCI Setup: ..................................................... 42
Load BIOS Defaults............................................................................ 44
Load Setup Defaults............................................................................ 44

ASUS P/I-P55SP4V User's Manual V
CONTENTS
X. DOS 3.1 & Windows 3.1x Audio Software
(with optional I-A16C Audio Card Bundle Only)
XI. Windows 95 Audio Software
(with optional I-A16C Audio Card Bundle Only)
Supervisor Password and User Password ........................................... 45
IDE HDD Auto Detection................................................................... 46
Save and Exit Setup ............................................................................ 47
Exit Without Saving ............................................................................ 47
V. DESKTOP MANAGEMENT........................................... 49
Desktop Management Interface (DMI) ..................................................... 49
Introducing the ASUS DMI Configuration Utility ....................... 49
System Requirements ................................................................... 49
Using the ASUS DMI Configuration Utility ................................ 50
Notes:............................................................................................ 50
VI. PCI-SC200 SCSI Card.................................................... 53
NCR SCSI BIOS and Drivers ................................................................... 53
The PCI-SC200 SCSI Interface Card........................................................ 54
Setting Up the PCI-SC200 .................................................................. 54
Setting the INTAssignment................................................................ 55
Terminator Settings ............................................................................. 55
SCSI ID Numbers ............................................................................... 56
VII. I-A16C Audio Card ....................................................... 57
I-A16C Audio Features ....................................................................... 57
Unpacking and Handling Precautions................................................. 57
Layout and Connectors ....................................................................... 58
Connectors .................................................................................... 58
Video Software Manual.......................................................... 59
VIII. DOS UTILITY ............................................................. 61
DOS Utility ............................................................................................... 61
1. SVGAUTL.EXE ............................................................................. 61
2. Video Modes ................................................................................... 63
IX. SOFTWARE DRIVERS ................................................. 68
Software Drivers ....................................................................................... 68
1. Windows 3.1 .................................................................................. 69
2. Windows 95 ................................................................................... 77
3. Windows NT 3.1 ............................................................................. 80
4. Windows NT 3.5, 3.51, & 4.0 ......................................................... 80
5. Autodesk ADI 4.2 -Protected Mode................................................ 82
6. OS/2 V2.1 ....................................................................................... 88
7. OS/2 V3.0 (Warp) .......................................................................... 89
8. Double Bytes OS/2 Warp ............................................................... 90

ASUS P/I-P55SP4V User's Manual
VI
FCC & DOC COMPLIANCE
FederalCommunications CommissionStatement
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: Theuseofshieldedcablesforconnectionofthemonitortothegraphics
card is required to assure compliance with FCC regulations. Changes or modifica-
tions to this unit not expressly approved by the party responsible for compliance
could void the user's authority to operate this equipment.
CanadianDepartment ofCommunications 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 P/I-P55SP4V User’s Manual 1
I. INTRODUCTION
I. INTRODUCTION
(Manual / Checklist)
How this manual is organized
This manual is divided into the following sections:
I. Introduction: Manual information and checklist
II. Features: Information and specifications
III. Installation: Instructions on setting up the motherboard
IV. BIOS Setup: BIOS software setup information
V. DMI Utility: BIOS supported Desktop Management Interface
VI. PCI-SC200: Installation of an optional SCSI card
VII. I-A16C: Installation of an optional Audio card
VIII. SiS Video: Installation and information for SiS video
IX. DOS/Win3.1x: Audio Software Manual (with I-A16C bundle)
X. Windows 95: Audio Software Manual (with I-A16C bundle)
Item Checklist
Please check that your package is complete. If you discover damaged or missing
items, please contact your retailer.
√The P/I-P55SP4V motherboard
√2 serial port ribbon cables attached to a mounting bracket
√1 parallel ribbon cable with mounting bracket
√1 IDE ribbon cable
√1 floppy ribbon cable
√1 Video + PS/2 Mouse Card (on 16-pin connector)
√Support software on CD or diskettes (view FILELIST.TXT for contents)
√This user's manual (audio sections included with I-A16C bundle)
Optional infrared module
Optional PCI-SC200 Fast-SCSI card
Optional I-A16C Audio Card

2 ASUS P/I-P55SP4V User’s Manual
II. FEATURES
Features of This Motherboard
The P/I-P55SP4V is carefully designed for the demanding PC user who wants a
great many features in a small package. This motherboard:
•Easy Installation: Is equipped with BIOS that supports auto
detection of hard drives and Plug and Play to make setup of hard drives and
expansion cards virtually automatic.
•Multi-Processor/Multi-SpeedSupport: SupportsonePentium(75-200MHz),
Cyrix P166+ (Rev 2.7 or later), or AMD-K5 (PR75-100MHz) (See page 11).
•SiS Chipset: Features SiS5596 chipset with built-in video controller.
Supports video shared memory from 1MB to 2MB.
•DesktopManagementInterface (DMI): Supports DMI through BIOS which
allows hardware to communicate within a standard protocol
creating a higher level of compatibility (see section V).
•L2 Cache: Provides 512KB Pipelined Burst SRAM onboard.
•VersatileDRAMMemory Support: Supports 72-pin SIMMs of 4MB, 8MB,
16MB, 32MB, 64MB to form a memory size between 8MB to 256MB. Sup-
ports both Fast Page Mode (FPM) and Extended Data Output (EDO) SIMM's.
•ISA and PCI Expansion Slots: Provides three 16-bit ISA slots, three 32-bit
PCI slots, and one PCI/MediaBus 2.0 which allows the use of either a standard
PCI card or the ASUS MediaBus Card.
•ASUS MediaBus Rev 2.0: 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. (For revision compatibility infor-
mation, please refer to page 18.)
•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. Two
floppy drives of either 5.25" or 3.5" (1.44MB or 2.88MB) are also supported
without an external card. The Japanese "Floppy 3 mode" (3.5" 1.2MB)
floppy standard is also supported.
•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, provides faster data transfer rates, and supports Enhanced IDE devices
such as CD-ROM drives. This controller supports PIO Modes 3 & 4 and Bus
Master IDE DMA Mode 2. BIOS supports IDE CD-ROM or SCSI drive
bootup.
(Features)
II. FEATURES

ASUS P/I-P55SP4V User’s Manual 3
II. FEATURES
•Optional IrDA: This motherboard supports an optional infrared port module
for wireless interface.
•NCR SCSI BIOS: This motherboard has firmware that supports the optional
ASUS PCI-SC200 SCSI controller cards.
Parts of the Motherboard
(Parts of Board)
II. FEATURES
SiS5596
Chipset
Onboard 512KB
Pipelined
Burst L2 Cache
CPU ZIF
Socket 7
PCI 4 orASUS
MediaBus 2.0
3 PCI Slots
Super Multi-I/O
Programmable
Flash ROM
(4) 72-pin SIMM
Sockets
3ISASlots
Onboard Floppy
& IDE Connect.
Parallel & Serial
Video Feature
Connector
PS/2 Mouse +
Video Connector

4 ASUS P/I-P55SP4V User’s Manual
III. INSTALLATION
Map of the Motherboard
ISA Slot 1 ISA Slot 2
ISA Slot 3
PCI Slot 4 / MediaBus 2.0 PCI Slot 3
PCI Slot 2
PCI Slot 1
Keyboard
Parallel Printer
SIMM Socket 4 (Bank 1) SIMM Socket 3 (Bank 1) SIMM Socket 2 (Bank 0) SIMM Socket 1 (Bank 0)
512KB Onboard L2 Cache
Case Connections
Feature Connector
JP1
Multi-I/O
JP12 JP11
CPU to Bus Ratio
JP4
Linear/Burst Mode
COM 1 COM 2
Primary IDE Secondary IDE Floppy Drives
P54C CPU Volt
IDE_LED
#CR2032
3Volt Button
Cell Battery
VGA + PS/2
Card Connector
Universal Serial Bus
(Reserved for future use)
JP8
Boot Block Program
BUS Freq.
JP5
JP6
JP7
Infrared Conn
JP16
CMOS RAM
JP29
JP28
JP27
JP26
JP25
JP24
JP23
P55C CPU Volt
Board Power Input
P8 P9
12V CPU Fan Power
CPU ZIF Socket 7
(Map of Board)
III. INSTALLATION

ASUS P/I-P55SP4V User’s Manual 5
III. INSTALLATION
Jumpers
1) JP1 p. 7 Multi-I/O Selection (Enable/Disable)
2) JP8 p. 7 Flash ROM Boot Block Program (Disable/Enable)
3) JP16 p. 8 CMOS RAM (Operation/Clear CMOS Data)
4) JP23-29 p. 9 Voltage Regulator Output Selection
5) JP5, JP6, JP7 p. 10 CPU External Clock (BUS) Frequency Selection
6) JP11, JP12 p. 10 CPU:BUS Frequency Ratio
Expansion Slots
1) SIMM Sockets p. 12 DRAM Memory Expansion sockets
2) CPU ZIF Socket 7 p. 15 Socket for Central Processing Unit (CPU)
3) ISA Slots 1, 2, 3 p. 16 16-bit ISA Bus Expansion slots
4) PCI Slots 1, 2, 3 p. 16 32-bit PCI Bus Expansion slots
5) PCI 4 / MediaBus p. 18 32-bit PCI Bus Slot and MediaBus
Connectors
1) Keyboard p. 19 Keyboard connector (5-pin Female)
2) Video + PS/2 Mouse p. 19 Video + PS/2 Mouse Card connector
3) Parallel Port (Printer) p. 20 Parallel Port (Printer) connector (26-pin Block)
4) Serial Port p. 20 Serial Port (COM1 & COM2) (10-pin Blocks)
5) Floppy Drive p. 21 Floppy Drive connector (34-pin Block)
6) Power Input p. 21 Motherboard Power connector (12-pin Block)
7) Primary/Second. IDE p. 22 Primary/Secondary IDE connectors (40-pin Blocks)
8) IDE_LED p. 22 IDE_LED activity light
9) Turbo/Power (CON1) p. 23 Turbo LED/Power LED (2-pins)
10) SMI Switch (CON1) p. 23 SMI Switch lead (2-pins)
11) Reset Switch (CON1) p. 23 Reset Switch lead (2-pins)
12) Key Lock (CON1) p. 23 Keyboard Lock Switch lead (5-pins)
13) Speaker (CON1) p. 23 Speaker connector (4-pins)
14) FAN p. 24 CPU 12V Cooling Fan connector
15) IR CON. p. 24 Infrared Port Module connector
(Map of Board)
III. INSTALLATION

ASUS P/I-P55SP4V User’s Manual6
(Jumpers)
III. INSTALLATION
III. INSTALLATION
Installation Steps
Before using your computer, you must complete the following steps:
1. Set Jumpers on the Motherboard
2. Install DRAM and SRAM 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
pins (JP) on the motherboard. See "Map of the Motherboard" on page 4 for loca-
tions 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 respec-
tively. 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 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 to-
gether. 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 compo-
nents against damage from static electricity, you should follow some precau-
tions 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.

ASUS P/I-P55SP4V User’s Manual 7
III. INSTALLATION
III. INSTALLATION
(Jumpers)
Jumper Settings
1. Onboard Multi-I/O Selection (JP1)
You can selectively disable each onboard Multi-I/O item (floppy, serial, paral-
lel, and IrDA) through BIOS (see CHIPSET FEATURES SETUP) or disable all
Multi-I/O items at once with the following jumper in order to use your own
Multi-I/O card.
Selections JP1
Enable [1-2] (Default)
Disable [2-3]
Multi I/O Setting (Enable / Disable)
Enable (Default) Disabled
1
2
3
JP1 1
2
3
JP1
2. Flash ROM Boot Block Programming (JP8)
This sets the operation mode of the boot block area of the BIOS Flash ROM to
allow programming in the Enabled position.
Programming JP8
Disabled [1-2] (Default)
Enabled [2-3]
Boot Block Programming (Disable / Enable)
Disabled (Default) Enabled
1
2
3
JP8 1
2
3
JP8

ASUS P/I-P55SP4V User’s Manual8
III. INSTALLATION
(Jumpers)
III. INSTALLATION
3. CMOS RAM (JP16)
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 CMOS
data: (1) Turn off the PC, (2) Set jumper to "Clear", (3) Power on the PC, (4)
Turn off the PC, (5) Set jumper to "Operation", (6) Power on the PC, (7) Hold
down <Delete> during bootup and enter BIOS setup to re-enter user
preferences.
Selections JP16
Operation [1-2] (Default)
Clear CMOS Data [2-3] (momentarily)
CMOS RAM (Operation / Clear CMOS Data)
Operation (Default) Clear CMOS Data
JP16JP16
1
2
3
1
2
3

ASUS P/I-P55SP4V User’s Manual 9
III. INSTALLATION
(Jumpers)
III. INSTALLATION
4. Voltage Regulator Output Selection (JP23-29)
These jumpers set the voltage supplied to the CPU. Determine whether your
CPU has a single power plane or dual power planes and then the voltage that it
uses. Current Intel CPU's marked "Pentium" has only a single power plane and
uses the standard 3.38 volts (STD) or 3.5 volts (VRE). 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. You may have one jumper on the
Single Power Plane and another on the Dual Power Planes at the same time.
Single Power Plane Type Voltage Dual Power Planes Voltage
JP24 [short] VRE 3.52V JP29 [short] Reserved
JP23 [short] (Default) STD 3.38V JP28 [short] 2.5V
JP27 [short] 2.88V
JP26 [short] 2.7V
JP25 [short] (Default) 2.8V
Voltage Regulator Output Selection (STD / VRE)
STD 3.3V - 3.465V (Default) VRE 3.4V - 3.6V
JP27
JP26
JP25
JP24
JP23
JP28
JP29
JP27
JP26
JP25
JP24
JP23
JP28
JP29

ASUS P/I-P55SP4V User’s Manual10
III. INSTALLATION
(Jumpers)
III. INSTALLATION
5. CPU External (BUS) Frequency Selection (JP5, JP6, JP7)
These jumpers tells 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 (JP11, JP12)
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.
CPUExternalClock(BUS)FrequencySelection
CPU:BUSFrequencyRatio(1.5x,2.0x,2.5x,3.0x)
1.5x(3/2)2.0x2.5x(5/2)3.0x
1
2
3
1
2
3
1
2
3
1
2
3
J
P
1
1
J
P
1
2
J
P
1
1
J
P
1
2
J
P
1
1
J
P
1
2
J
P
1
1
J
P
1
2
50MHz
12 3
JP7
JP6
JP5
55MHz
12 3
JP7
JP6
JP5
60MHz
123
JP7
JP6
JP5
66MHz
123
JP7
JP6
JP5
Set the jumpers by the Internal speed of the Intel, AMD, Cyrix, or CPU as follows:
(BUS Freq.) (Freq. Ratio)
CPU Model Freq. Ratio (BUS Freq.) JP5 JP6 JP7 JP11 JP12
Intel Pentium 200MHz 3.0x 66MHz [1-2] [1-2] [1-2] [2-3] [1-2]
Intel Pentium 180MHz 3.0x 60MHz [1-2] [1-2] [2-3] [2-3] [1-2]
Intel Pentium 166MHz 2.5x 66MHz [1-2] [1-2] [1-2] [2-3] [2-3]
Intel Pentium 150MHz 2.5x 60MHz [1-2] [1-2] [2-3] [2-3] [2-3]
Intel Pentium 133MHz 2.0x 66MHz [1-2] [1-2] [1-2] [1-2] [2-3]
Intel Pentium 120MHz 2.0x 60MHz [1-2] [1-2] [2-3] [1-2] [2-3]
Intel Pentium 100MHz 1.5x 66MHz [1-2] [1-2] [1-2] [1-2] [1-2]
Intel Pentium 90MHz 1.5x 60MHz [1-2] [1-2] [2-3] [1-2] [1-2]
Intel Pentium 75MHz 1.5x 50MHz [1-2] [2-3] [2-3] [1-2] [1-2]
AMD-K5 100MHz 1.5x 66MHz [1-2] [1-2] [1-2] [1-2] [1-2]
AMD-K5 90MHz 1.5x 60MHz [1-2] [1-2] [2-3] [1-2] [1-2]
AMD-K5 75MHz 1.5x 50MHz [1-2] [2-3] [2-3] [1-2] [1-2]
*Cyrix 166+ 133MHz 2.0x 66MHz [1-2] [1-2] [1-2] [1-2] [2-3]
*NOTE: Only Cyrix Revision 2.7 or later is supported on this motherboard. See next page
for revision identification. Bootup screen will show 6x86-P166+ -S CPU at 133MHz with
the Cyrix 166+ installed on this motherboard.

ASUS P/I-P55SP4V User’s Manual 11
III. INSTALLATION
Cyrix CPU Identification
The Cyrix CPU that is supported on this motherboard is labeled Cyrix 6x86 P166+
but must be Revision 2.7 and later. Look on the underside of the CPU for the serial
number. The number should read G8DC6620A or larger.
(Cyrix CPU Identify)
III. INSTALLATION

ASUS P/I-P55SP4V User’s Manual12
III. INSTALLATION
2. System Memory (DRAM & SRAM)
This motherboard supports four 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.
IMPORTANT: Memory setup is required in "Auto Configuration"in the
CHIPSET FEATURES SETUP of Section IV 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.
III. INSTALLATION
(Memory)
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 or EDO SIMM
Bank 1 4MB, 8MB, 16MB, 32MB, 64MB x2
SIMM Sockets 3&4 72-pin FPM or EDO SIMM
Total System Memory (Max 256MB) =

ASUS P/I-P55SP4V User’s Manual 13
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.
72 Pin SIMM DRAM Sockets & Module
4321
Notched End
Bank1 Bank0
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.
Metal Clip
Plastic Safety Tab (This Side Only) Mounting Hole
72 Pin DRAM in SIMM Socket
4. The plastic guides should go through the two "Mounting Holes" on the sides
and the "Metal Clips" should snap on the other side.
5. To release the memory module, squeeze both "Metal Clips" outwards and rock
the module out of the "Metal Clips".
(DRAM Memory)
III. INSTALLATION

ASUS P/I-P55SP4V User’s Manual14
III. INSTALLATION
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