Asus P I-P55T2P4S User manual

R
P/I-P55T2P4
Pentium®Motherboard
USER’S MANUAL

P/I-P55T2P4 User's Manual
II
USER'S NOTICE
No part of this product, including the product and software may be repro-
duced, transmitted, transcribed, stored in a retrieval system, or translated
into any language in any form by any means with the express written per-
mission ofASUSTeK COMPUTER INC. (hereinafter referred to asASUS)
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 merchantability or fitness for a particular purpose. In no
event shall ASUS 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 no-
tice. For updated BIOS, drivers, or product release information you may
visit ASUSTeK's home page at: http://www.asus.com.tw/
Products mentioned in this manual are mentioned for identification pur-
poses only. Product names appearing in this manual may or may not be
registered trademarks or copyrights of their respective companies.
© Copyright 1996 ASUSTeK Computer Inc. All rights reserved.
Product Name: P/I-P55T2P4
Product Rev: 2.1
Manual Rev: 2.0
BIOS Version: #401A0-0101 (Displayed on top left during boot-up)
Release Date: April 1996

P/I-P55T2P4 User's Manual III

P/I-P55T2P4 User's Manual
IV
CONTENTS
I. INTRODUCTION.........................................................1
How this manual is organized.......................................................... 1
Item Checklist .................................................................................. 1
II. FEATURES ..................................................................2
Features of This Motherboard.......................................................... 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 .................................................................... 8
2. System Memory (DRAM & SRAM).......................................... 12
DRAM Memory Installation Procedures: ............................ 13
Level 2 External Static RAM (SRAM) Cache ........................... 14
Compatible Cache Modules for this Motherboard ............... 14
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
Final Power Connection Procedures .................................... 25

P/I-P55T2P4 User's Manual V
CONTENTS
IV. BIOS SOFTWARE .....................................................26
6. BIOS Setup ................................................................................. 26
Standard CMOS Setup ............................................................... 27
Details of Standard CMOS Setup:........................................ 28
BIOS Features Setup .................................................................. 31
Details of BIOS Features Setup:........................................... 31
Chipset Features Setup ............................................................... 34
Power Management Setup.......................................................... 37
Details of Power Management Setup: .................................. 37
PNP and PCI Setup .................................................................... 39
Load BIOS Defaults ................................................................... 41
Load Setup Defaults ................................................................... 41
Supervisor Password and User Password .................................. 42
IDE HDD Auto Detection .......................................................... 43
Save and Exit Setup ................................................................... 44
Exit Without Saving ................................................................... 44
Flash Memory Writer Utility ........................................................... 45
The Flash Memory Writer Utility Screen:............................ 47
Details of Advanced Features:.............................................. 48
V. PCI-SC200 SCSI Card.................................................51
NCR SCSI BIOS and Drivers .......................................................... 51
The PCI-SC200 SCSI Interface Card .............................................. 52
Setting Up the PCI-SC200 ......................................................... 52
Setting the INTAssignment ....................................................... 53
Terminator Settings .................................................................... 53
SCSI ID Numbers ...................................................................... 54

P/I-P55T2P4 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 inter-
ference 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 com-
munications. However, there is no guarantee that interference will not oc-
cur in a particular installation. If this equipment does cause harmful inter-
ference to radio or television reception, which can be determined by turn-
ing 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.
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 Interfer-
ence Regulations of the Canadian Department of Communications.

P/I-P55T2P4 User's Manual 1
I. INTRODUCTION
I.INTRODUCTION
(Manual/Checklist)
How this manual is organized
This manual is divided into five sections as follows:
1. Introduction: Manual information and checklist
2. Features: Information and specifications concerning this product
3. Installation: Instructions on setting up the motherboard.
4. BIOS Setup: BIOS software setup information.
5. PCI-SC200: Installation of an optional SCSI card.
Item Checklist
Please check that your package is complete. If you discover damaged or
missing items, please contact your retailer.
√The P/I-P55T2P4 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 diskette containing support software as follows:
• Flash Memory Writer utility to update the FLASH BIOS
• Binary file containing BIOS information
• Desktop Management Interface (DMI) software
• Readme files gives instructions on use of the files
√This user's manual
Optional PS/2 mouse cable with mounting bracket
Optional infrared module
Optional ASUS pipelined burst cache module
Optional PCI-SC200 SCSI card

P/I-P55T2P4 User's Manual
2
II. FEATURES
Features of This Motherboard
TheP/I-P55T2P4is carefullydesigned forthe demandingPCuserwho wants
a great many features in a small package. This motherboard:
•Easy Installation: Is equipped with BIOS supports auto detection of
hard drives and Plug and Play to make setup of hard drives and expan-
sion cards virtually automatic.
•Multi-Speed Support: Supports one 75-166MHz Pentium CPU on a
ZIF Socket 7.
•Intel Chipset: Features Intel's 430HX PCIset with I/O subsystems.
•ErrorCheckingandCorrecting(ECC): Using Intel's 430HX PCIset
and parity DRAM modules can detect and correct 1 bit memory errors.
•DestopManagementInterface(DMI): IncludesIntel's430HX PCIset
which supports DMI which allows hardware to communicate within a
standard protocol creating a higher level of compatibility. (Requires
DMI-enabled components. Please view the ReadMe file for details.)
•L2 Cache: Provides the option of 0KB upgradeable to 256KB or
512KB, on-board 256KB upgradeable to 512KB, or on-board 512KB
Pipelined Burst SRAM. Upgrades are made through a Synchronous
SIMM cache module. (See page 14 for compatible cache modules.)
•VersatileDRAMMemorySupport: Supports72-pinSIMMsof4MB,
8MB, 16MB, 32MB, or 64MB to form a memory size between 8MB to
256MB. Supports both Fast Page Mode and Extended Data Output
(EDO) SIMMs.
•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 an standard PCI card or the ASUS MediaBus Card.
•ASUSMediaBusRev2.0: Features an expansion slotextensionshared
with PCI Slot 4 for an optional multifunctional expansion card which
facilitates building of multimedia systems. (For revision compatibil-
ity information, 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 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.
(Features)
II. FEATURES

P/I-P55T2P4 User's Manual 3
II. FEATURES
•PCI Bus Master IDE Controller: Comes with an on-board PCI Bus
Master IDE controller with two connectors that supports four IDE de-
vices in two channels, provides faster data transfer rates, and supports
EnhancedIDE devices such as TapeBackupand CD-ROM drives. This
controller supports PIO Modes 3 and 4 and Bus Master IDE DMA
Mode 2. BIOS supports IDE CD-ROM boot-up.
•Optional IrDAand PS/2: This motherboard supports an optional in-
frared port module for wireless interface and a PS/2 mouse cable set.
•NCR SCSI BIOS: This motherboard has firmware that supports the
optional ASUS PCI-SC200 SCSI controller cards.
Parts of the Motherboard
II. FEATURES
(PartsofBoard)
Intel's430HX
PCIset
On-Board256KB/
512KBPipelined
BurstL2Cache
CPUZIF
Socket7
PCI4orASUS
MediaBus2.0
3PCISlots
Super
Multi-I/O
FlashROM
72-pinSIMM
Sockets
L2Upgrade
Cache
ExpansionSlot
3ISASlots

P/I-P55T2P4 User's Manual
4
III. INSTALLATION
Map of the Motherboard
(MapofBoard)
III. INSTALLATION
JP18
JP8
ISA Slot 3
ISA Slot 2 ISA Slot 1
PCI Slot 4 / MediaBus 2.0 PCI Slot 3
PCI Slot 2
PCI Slot 1
Floppy Drives Primary IDE Secondary IDE
Board Power Input
SIMM Slot 1 SIMM Slot 2 SIMM Slot 3 SIMM Slot 4
Pipelined Burst Level 2 Cache Expansion Slot
256KB On-Board L2 Cache
ZIF Socket 7
JP19
Fan Power
JP11
JP12
JP10
JP9
JP20
JP17
JP2
JP1
Parallel Printer
COM 1 COM 2
Keyboard
IDE LED
JP13
IR
FOR SMC 37C669
MULTI I/O
UMC OR SMC
PS/2 Mouse
CON1

P/I-P55T2P4 User's Manual 5
III. INSTALLATION
Jumpers
1) JP1 (SMC 37C669) p. 8 Multi-I/O Selection (Enable/Disable)
2) JP8 p. 8 Flash ROM Boot Block Program (Enable/Disable)
3) JP2 p. 9 Total Level 2 Cache Size Setting
4) JP17 p. 9 Voltage Regulator Output Selection
5) JP11, JP12 p. 10 CPU External Clock (BUS) Frequency Selection
6) JP9, JP10 p. 10 CPU:BUS Frequency Ratio
7) JP18 p. 11 PS/2 Mouse on IRQ12 (Enable/Disable)
8) JP19 p. 11 CMOS RAM (Operation/Clear CMOS Data)
Expansion Slots
1) SIMM Slots p. 12 DRAM Memory Expansion slots
2) Cache Expansion p. 14 Socket for Pipelined Burst SRAM Cache Module
3) ZIF Socket 7 p. 15 Socket for Central Processing Unit (CPU)
4) ISA Slots 1,2,3 p. 16 16-bit ISA Bus Expansion slots
5) PCI Slots 1,2,3 p. 16 32-bit PCI Bus Expansion slots
6) PCI 4 / MediaBus p. 18 32-bit PCI Bus Slot and MediaBus
Connectors
1) Keyboard p. 19 Keyboard connector (5-pin Female)
2) PS/2 Mouse p. 19 PS/2 Mouse connector (6-pin Block)
3) Parallel Port p. 20 Parallel Port 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 IDE p. 22 Primary IDE connector (40-pin Block)
8) Secondary IDE p. 22 Secondary IDE connector (40-pin Block)
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)JP20 p. 24 IDE LED activity light
15)JP13 p. 24 CPU 12V Cooling Fan connector
16)IR p. 25 Infrared Port Module connector
(MapofBoard)
III. INSTALLATION

P/I-P55T2P4 User's Manual
6
(Jumpers)
III. INSTALLATION
III. INSTALLATION
Installation Steps
Before using your computer, you must follow the six steps as follows:
1. Set Jumpers on the Motherboard
2. Install DRAM Modules
3. Install the CPU
4. Install Expansion Cards
5. Connect Cables, Wires, and Power Supply
6. Setup the BIOS Software
1. Jumpers
Several hardware settings are made through the use of jumper caps to con-
nect jumper 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
topPin 1 or on the left Pin 1 when holding the motherboard with the key-
board 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 and for open. For manufactur-
ing 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.

P/I-P55T2P4 User's Manual 7
III. INSTALLATION
III. INSTALLATION
(Jumpers)
WARNING: Some pins are used for connectors or power sources.
These are clearly separated from jumpers in "Map of the Motherboard"
on page 4. Placing jumper caps over these will cause damage to your
motherboard.
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.
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 you work on lay down
components.

P/I-P55T2P4 User's Manual
8
III. INSTALLATION
(Jumpers)
III. INSTALLATION
Jumper Settings
1. On-Board Multi-I/O Selection (JP1) (For SMC SMC37C669 Only)
For SMC Multi-I/O SMC37C669, you can selectively disable each on-
board Multi-I/O item (floppy, serial, parallel, and IrDA) through BIOS
(see page 35) or disable all Multi-I/O items at once with the following
jumper in order to use your own Multi-I/O card. If your motherboard
does not use the above SMC Multi-I/O, the following jumper will not be
available and you can only disabled each item through BIOS.
Selections JP1
Enable [1-2] (Default)
Disable [2-3]
1
Multi I/O Setting (Enable / Disable)
2
3
JP
1
Enable (Default) Disabled
(For SMC 37C669 Only)
1
2
3
JP
1
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]
1JP8
Boot Block Programming (Disable / Enable)
JP8 23 123
Disabled (Default) Enabled

P/I-P55T2P4 User's Manual 9
III. INSTALLATION
(Jumpers)
III. INSTALLATION
3. Total Level 2 Cache Size Setting (JP2)
This jumper sets the total amount of L2 cache that is present. If you
have two cache chips on-board (see "Map of Motherboard" for loca-
tions), then you have either 256KB or 512KB. An "ASUS" or "COAST"
cache module can be used to upgrade the 256KB version to 512KB. If
there is no on-board cache, you must install a cache module of either
256KB or 512KB. IMPORTANT: See page 14 "SRAM Cache" for
installation procedures. Regardless of your cache combination, set
the following jumpers according to the total amount of L2 cache that is
present on-board and installed as a module.
Selections JP2
256KB [1-2]
512KB [2-3]
Total L2 Cache Size Setting (256KB / 512KB)
1
2
3
JP
2
256KB 512KB
1
2
3
JP
2
4. Voltage Regulator Output Selection (JP17)
These jumpers set the voltage supplied to the CPU.
Selections JP17
STD 3.3V-3.465V [2-3] (Default)
VRE 3.4V-3.6V [1-2]
Voltage Regulator Output Selection (STD / VRE)
STD 3.3V - 3.465V (Default) VRE 3.4V - 3.6V
JP17 123
1
JP17 23

P/I-P55T2P4 User's Manual
10
III. INSTALLATION
(Jumpers)
III. INSTALLATION
5. CPU External (BUS) Frequency Selection (JP11, JP12)
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 (JP9, JP10)
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 (JP11, JP12).
1
2
3
JP
12 JP 11
50MHz 55MHz
1
2
3
JP
12 JP 11
60MHz
1
2
3
JP
12 JP 11
66MHz
1
2
3
CPU External Clock (BUS) Frequency Selection
CPU : BUS Frequency Ratio (1.5x, 2.0x, 2.5x, 3.0x)
JP
10 JP 9
1.5 x 2.0 x 2.5 x 3.0 x
JP
10 JP 9 JP 10 JP 9 JP 10 JP 9
JP
12 JP 11
1
2
3
1
2
3
1
2
3
1
2
3
Set the jumpers by the Internal speed of the Intel CPU as follows:
Internal Ratio External JP12 JP11 JP10 JP9
166MHz 2.5x 66MHz [2-3] [1-2] [2-3] [2-3]
150MHz 2.5x 60MHz [1-2] [2-3] [2-3] [2-3]
133MHz 2.0x 66MHz [2-3] [1-2] [1-2] [2-3]
120MHz 2.0x 60MHz [1-2] [2-3] [1-2] [2-3]
100MHz 1.5x 66MHz [2-3] [1-2] [1-2] [1-2]
90MHz 1.5x 60MHz [1-2] [2-3] [1-2] [1-2]
75MHz 1.5x 50MHz [2-3] [2-3] [1-2] [1-2]

P/I-P55T2P4 User's Manual 11
III. INSTALLATION
(Jumpers)
III. INSTALLATION
7. PS/2 Mouse on IRQ12 Setting (JP18)
JP7 enables or disables the on-board PS/2 mouse lead connector. When
Enabled, the port becomes active and uses IRQ12. See Page 19 for the
"PS/2 Mouse connector."
Selections JP18
Disable [2-3] (Default)
Enable [1-2]
1JP18
PS/2 Mouse on IRQ 12 (Disable / Enable)
JP18 23 123
Disabled (Default) Enabled
8. CMOS RAM (JP19)
This clears the user-entered information stored in the Dallas DS12887A
Chip such as hard disk information and passwords. Simply connect a
jumper cap over this jumper for a few seconds then remove. Make sure
that your computer is turned off. You must enter the BIOS setup (by
holding down <DEL> during power-up) after this is done to re-enter
BIOS information (see BIOS SETUP).
Selections JP19
Normal [open] (Default)
Clear CMOS [short] (momentarily)
CMOS RAM (Operation / Clear CMOS Data)
JP
19
Operation (Default) Clear Data
JP
19
Note: Dallas DS12B887 chips and Benchmarq BQ3287A chips require
that you power on with the jumper shorted as in the following procedures:
(1) Short Jumper (while the computer is off), (2) Power on, (3) Power off,
(4) Open Jumper, (5) Power on, (6) Setup BIOS (hold down <DEL>)

P/I-P55T2P4 User's Manual
12
III. INSTALLATION
2. System Memory (DRAM & SRAM)
Thismotherboardsupportsfour 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 TTL 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.
IMPORTANT: MemorysetupisrequiredinBIOS Chipset Setup"Auto
Configuration" on page 35.
Install two memory modules each time as shown in the chart below.
Bank 0 Bank 1 Total Memory
Slots 1 & 2 Slots 3 & 4 Combination
4MB x 2 None 8MB
8MB x 2 None 16MB
16MB x 2 None 32MB
32MB x 2 None 64MB
64MB x 2 None 128MB
4MB x 2 4MB x 2 16MB
4MB x 2 8MB x 2 24MB
4MB x 2 16MB x 2 40MB
4MB x 2 32MB x 2 72MB
4MB x 2 64MB x 2 136MB
8MB x 2 4MB x 2 24MB
8MB x 2 8MB x 2 32MB
8MB x 2 16MB x 2 48MB
8MB x 2 32MB x 2 80MB
8MB x 2 64MB x 2 144MB
16MB x 2 4MB x 2 40MB
16MB x 2 8MB x 2 48MB
16MB x 2 16MB x 2 64MB
16MB x 2 32MB x 2 96MB
16MB x 2 64MB x 2 160MB
32MB x 2 4MB x 2 72MB
32MB x 2 8MB x 2 80MB
32MB x 2 16MB x 2 96MB
32MB x 2 32MB x 2 128MB
32MB x 2 64MB x 2 192MB
64MB x 2 4MB x 2 136MB
64MB x 2 8MB x 2 144MB
64MB x 2 16MB x 2 160MB
64MB x 2 32MB x 2 192MB
64MB x 2 64MB x 2 256MB
III. INSTALLATION
(Memory)

P/I-P55T2P4 User's Manual 13
III. INSTALLATION
(DRAMMemory)
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 slots which
requires the "Notched End" of the SIMM memory modules.
72 Pin SIMM DRAM Slots & Module
1234
Notched End
2. Press the memory module firmly into place starting from a 45 degree
angle making sure that all the contacts are aligned with the slot.
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 "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".
IMPORTANT: Do not use memory modules with more than 24 chips per mod-
ule. Modules with more than 24 chips exceed the design specifications of the
memory subsystem and will cause unreliable operation.
IMPORTANT: Do not use SIMM Modules that use an extra TTLchip to con-
vert the memory module from asymmetric to symmetric.

P/I-P55T2P4 User's Manual
14
(SRAMCache)
III. INSTALLATION
III. INSTALLATION
Level 2 External Static RAM (SRAM) Cache
Themotherboardyoumaypurchasemay have either 0KB, 256KB, or 512KB
on-board. If you have two cache chips on-board (see "Map of Mother-
board" for locations), then you have either 256KB or 512KB pipelined bust
SRAM cache. An "ASUS" or "COAST" cache module can be used to up-
grade the 256KB version to 512KB. The 512KB version cannot be up-
graded any further. If there is no on-board cache, you may install a SIMM
cache module of either 256KB or 512KB.
IMPORTANT: You must set jumper 2 "Total Level 2 Cache Size Set-
ting" on page 9 when changes are made to your cache size.
256KB PB Cache Module
42 Pins
38 Pins
Insert the module as shown. Because the number of pins are different on
either side of the break, the module will only fit in the orientation as shown.
Compatible Cache Modules for this Motherboard
SIMM Cache Module 256KB 0KB
ASUS CM1 Rev 1.0 No No
ASUS CM1 Rev 1.3 No No
ASUS CM4 Rev 1.5 No No
ASUS CM1 Rev 1.6 Yes No
COAST 1.1 No No
COAST 1.2 No No
COAST 1.3 No No
COAST 2.0 Yes Yes
COAST 2.1 Yes Yes