Asus C-P55T2D User manual

R
C-P55T2D CPU Card
USER'S MANUAL

ASUS C-P55T2D User's Manual
II
USER'S NOTICE
Product Name: ASUS C-P55T2D
Manual Revision: 1.43
Release Date: May 1997
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.
Specifications are subject to change without notice. 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 shallASUS be liable for any loss or profits, loss of
business, loss of use or data, interruption of business, or for indirect, special, inci-
dental, or consequential damages of any kind, even if ASUS 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.
• Intel, LANDesk, and Pentium are registered trademarks of Intel Corporation.
• IBM is a registered trademark of International Business Machines Corp.
• 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 andAcrobat 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 you may visit the ASUS home page
at http://www.asus.com.tw/ or contact ASUS from the following page.
© Copyright 1997 ASUSTeK COMPUTER INC. All rights reserved.

ASUS C-P55T2D 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 C-P55T2D User's Manual
IV
CONTENTS
I. INTRODUCTION........................................................1
How this manual is organized..........................................................1
Item Checklist ..................................................................................1
II. FEATURES .................................................................2
Map of the CPU Card.................................................................2
Features of This CPU card...............................................................2
Parts of the CPU Card ................................................................2
III. INSTALLATION ......................................................3
Jumper Settings ..........................................................................3
Dual CPU Compatibility ............................................................5
Dual CPU Identification Table .............................................6
Power Connection Procedures..............................................7
BIOS Chip ..................................................................................7
Support Software........................................................................7
IV. BIOS SOFTWARE ....................................................8
Flash Memory Writer Utility ...........................................................8
The Flash Memory Writer Utility Screen: ............................8
BIOS Setup .................................................................................... 11
Load Defaults .....................................................................12
Standard CMOS Setup .............................................................12
Details of Standard CMOS Setup:......................................13
BIOS Features Setup ................................................................16
Details of BIOS Features Setup:.........................................16
Chipset Features Setup .............................................................19
Power Management Setup........................................................22
Details of Power Management Setup: ................................22
PNP and PCI Setup ..................................................................24
Load BIOS Defaults .................................................................26
Load Setup Defaults .................................................................26
Supervisor Password and User Password ................................27
IDE HDD Auto Detection ........................................................28
Save and Exit Setup .................................................................29
Exit Without Saving .................................................................29

ASUS C-P55T2D User's Manual V
CONTENTS
V. DESKTOP MANAGEMENT...................................31
Desktop Management Interface (DMI)..........................................31
Introducing the DMI Configuration Utility ........................31
System Requirements .........................................................31
Using the DMI Configuration Utility .................................32
Notes:..................................................................................32

ASUS C-P55T2D User's Manual
VI
FederalCommunications Commission Statement
This device complies with FCC Rules Part 15. Operation is subject to the following
two conditions:
• This device may not cause harmful interference, and
• This device must accept any interference received, including interference that
may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installa-
tion. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with manufacturer's instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the inter-
ference by one or more of the following measures:
• Re-orient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which
the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
WARNING: 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 of CommunicationsStatement
This digital apparatus does not exceed the Class B limits for
radio noise emissions from digital apparatus set out in the Radio Interference Regu-
lations of the Canadian Department of Communications.
FCC & DOC COMPLIANCE

ASUS C-P55T2D User’s Manual 1
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 CPU card
IV. BIOS Setup: BIOS software setup information
V. DMI Utility: BIOS supported Desktop Management Interface
Item Checklist
Please check that your package is complete. If you discover damaged or missing
items, please contact your retailer.
√The C-P55T2D CPU card
√Support software (view FILELIST.TXT detailed contents and description)
• Bus Master IDE Drivers
• PFLASH BIOS Utility
√This user's manual
I. INTRODUCTION
(Manual / Checklist)

2ASUS C-P55T2D User’s Manual
II. FEATURES
Features of This CPU card
The C-P55T2D is carefully designed for the demanding PC user who wants great
versatility in the assembly of a computer system. This CPU card:
•PS/2 Connectors: PS/2 Mouse & PS/2 Keyboard connectors on bracket.
•VersatileProcessorSupport: IntelPentium
®
75-233MHz(P55C-MMX
™
,P54C/
P54CS), IBM
®
/Cyrix
®
6x86-PR166+ (Rev 2.7 or later), IBM
®
/Cyrix
®
6x86MX
™
(PR166 & above), AMD-K5
™
(PR75-PR133), AMD-K6
™
(PR166-PR233).
Note: Only Intel CPUs support dual-processor configuration. See page 6 table.
•Intel Chipset: Features Intel's 430HX PCIset with I/O subsystems.
•ErrorChecking and Correcting (ECC): Using Intel's 430HX PCIset and par-
ity DRAM modules can detect and correct 1-bit memory errors.
•Oncard L2 Cache Memory: Oncard 512KB Pipelined Burst SRAM.
Parts of the CPU Card
(Features)
II. FEATURES
PS/2 Mouse
PS/2 Keyboard
3V-CPU Vcore
Voltage Selection
JP1
CPU Fan Power
JP14
APIC Dual CPU Selection
Freq. Ratio
JP15
JP16
CPU Fan Power
JP20
CPU Vcore
Voltage Selection
12 543
Processor 2
CPU ZIF Socket 7 CPU ZIF Socket 7
Processor 1
Map of the CPU Card
PS/2
Mouse
PS/2
Keyboard
Dual ZIF Socket 7
Intel 430HX PCIset

ASUS C-P55T2D User’s Manual 3
III. INSTALLATION
Jumper Settings
CPU to BUS Frequency Ratio (JP15, 16)
These jumpers set the frequency ratio between the Internal frequency of the
CPU and the External frequency (called the BUS Clock) within the CPU.
CPU : BUS Frequency Ratio
Complete Names:
Intel Pentium P54C, P55C-MMX
AMD K5, K6
IBM/Cyrix 6X86, 6x86MX
P54C/K5
P55C/K6/MX
IBM/Cyrix6X86
3.0x(3/1)
3.0x(3/1)
4.0x(4/1)
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
1.5x(3/2)
3.5X(7/2)
3.0x(3/1)
1
2
JP15
JP16
3/2 2 5/2 3
Setthejumpersby theInternalspeedof theIntelPentium orcompatibleCPUs as follows:
(CPU Card (CPU Ext. Freq
CPU BUS BUS Ratio) Ext. on Baseboard)
Internal Ratio JP15 JP16 Freq. JP3 JP2
233MHz 3.5x [OFF] [OFF] 66MHz [1-2] [2-3]
200MHz 3.0x [ON] [OFF] 66MHz [1-2] [2-3]
166MHz 2.5x [ON] [ON] 66MHz [1-2] [2-3]
150MHz 2.5x [ON] [ON] 60MHz [2-3] [1-2]
133MHz 2.0x [OFF] [ON] 66MHz [1-2] [2-3]
120MHz 2.0x [OFF] [ON] 60MHz [2-3] [1-2]
100MHz 1.5x [OFF] [OFF] 66MHz [1-2] [2-3]
90MHz 1.5x [OFF] [OFF] 60MHz [2-3] [1-2]
75MHz 1.5x [OFF] [OFF] 50MHz [1-2] [1-2]
CPU External Clock (BUS) Frequency Selection
60MHz
JP2 JP3
1
2
3
66MHz
JP2 JP3
1
2
350MHz
JP2 JP3
1
2
3
III. INSTALLATION
(Jumpers)
WARNING: The CPU and/or motherboard will overheat if there is no
airflow across the CPU and onboard heatsinks.

4ASUS C-P55T2D User’s Manual
III. INSTALLATION
Single/Dual Power Plane CPU Voltage Regulator Selections (JP1, 20)
The following jumpers set the voltage supplied to the CPU. Determine whether
your CPU has a Single Power Plane or Dual Power Planes and then the volt-
age 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.
You may have one jumper on the Single Power Plane and another on the Dual
Power Planes at the same time.
WARNING: Incorrect setting can damage your CPU. If you are not
exactly clear on CPU jumper settings, check with your retailer.
3 Volt CPU Vcore Voltage Selection (JP1)
Single Power Plane CPU Voltage Selection
1
2
P54C/CS
(STD 3.4V) Default
JP13
2
1
3
2
1
JP1
P54C/CS/K5/6x86
(VRE 3.5V)
2.x Volt CPU Vcore Voltage Selection (JP20: 1-5)
Dual Power Plane CPU Voltage Selection
JP20
P55C/6x86MX (2.8V)
1
2
12 543 12 543
JP20
K6-PR233 (3.2V)
JP20
K6-PR166/200 (2.9V)
Power Type: Single Power Plane Dual Power Planes
CPU Voltage: STD VRE 2.5V 2.7V 2.8V 2.9V 3.2V
JP1 [1-2] [2-3] ----- ----- ----- ----- -----
JP20 ----- ----- [Short1] [Short2] [Short3] [Short4] [Short5]
IMPORTANT: When installing only one processor, you must use the
“Processor 1” CPU ZIF Socket.
(Jumpers)
III. INSTALLATION

ASUS C-P55T2D User’s Manual 5
III. INSTALLATION
APIC Dual CPU Selection (JP14)
This jumper turns on or off the multiprocessor operating system’s support for multi-
processors regardless of the number of processors installed in the system.
For single processor operating systems (e.g. DOS, OS/2 Warp, Win3.1x,
Win95, Nextstep): You can use one (or two) processor(s) and this “APIC Dual
CPU Selection” jumper has no function (you may leave on default setting).
For multiprocessor operating systems (e.g. WinNT, Unixware, SCO Unix
MP, Solaris 2.51): You can use one or two processors and Enable this “APIC
Dual CPU Selection” jumper. This solution allows some multiprocessor operat-
ing systems to upgrade from one processor to two processors in the future with-
out having to reinstall a multiprocessor OS. Otherwise Disable the dual proces-
sor support in a multiprocessor operating system if for some reason necessary.
Dual CPU JP14
Enable [1-2] (Default)
Disable [2-3]
APIC Dual CPU (Enable/Disable)
123JP14
Disable
JP14
123
Enable (Default)
1
2
Dual CPU Compatibility
A table on the next page shows the compatible CPU’s to be used on the ZIF socket
for the second processor. The following are codes used in the table:
•Type 0: This type of CPU can be used as the first processor only. Almost all
CPU’s are in this category and therefore not listed in the table.
•Type 2: This type of CPU can only be used as the second processor.
•Type 0/2: This type of CPU can be used as the first or second processor.
•Core Speed: This is the advertised speed of the CPU.
•BUS Speed: This is the BUS frequency that the baseboard must be set to.
•S-Spec: This is the identification code marked on the surface of the processor
without an attached fan heatsink. The code is marked on the underside of pro-
cessors with an attached fan heatsink.
5: This is a boxed CPU without an attached fan heatsink
6: This is a boxed CPU with an attached fan heatsink
(Jumpers)
III. INSTALLATION

6ASUS C-P55T2D User’s Manual
Dual CPU Identification Table
For 75-, 90, 100-, 120-, 133-, 150-, 166-, 200-MHz Pentium Processors
(Dual CPU Table)
III. INSTALLATION
III. INSTALLATION
Type Speed MHz S-Spec Voltage
(Core/BUS)
0/2 75/50 SX969 STD
0/2 75/50 SX998 STD
0/2 75/50 SZ9945STD
0/2 75/50 SU0706STD
0/2 75/50 SX961 STD
0/2 75/50 SZ9775STD
0/2 75/50 SY005 STD
0/2 75/50 SU0976STD
0/2 75/50 SU0986STD
2 90/60 SX874 STD
0/2 90/60 SX957 STD
0/2 90/60 SX958 STD
0/2 90/60 SX959 STD
0/2 90/60 SZ9785STD
2 90/60 SX942 STD
2 90/60 SX943 STD
2 90/60 SX944 STD
0/2 90/60 SX968 STD
0/2 90/60 SZ9955STD
0/2 90/60 SU0316STD
0/2 90/60 SY006 STD
0/2 100/50, 66 SX970 VRE
0/2 100/50, 66 SX963 STD
0/2 100/50, 66 SZ9965STD
0/2 100/50, 66 SU0326STD
Type Speed MHz S-Spec Voltage
(Core/BUS)
0/2 100/66 SX962 VRE
0/2 100/66 SY007 STD
0/2 100/66 SU1105STD
0/2 100/66 SU0996STD
0/2 120/60 SY033 STD
0/2 120/60 SU1006STD
0/2 133/66 SY022 STD
0/2 133/66 SY023 STD
0/2 133/66 SU0736STD
0/2 120/60 SK110 STD
0/2 133/66 SK106 STD
0/2 133/66 S106J7STD
0/2 133/66 SK107 STD
0/2 133/66 SU0386STD
0/2 150/60 SY015 STD
0/2 150/60 SU0716STD
0/2 166/66 SY016 VRE
0/2 166/66 SY017 VRE
0/2 166/66 SU0726VRE
0/2 200/66 SY044 VRE

ASUS C-P55T2D User’s Manual 7
BIOS Chip
The BIOS chip on the the Pentium CPU card and the Pentium Pro CPU card are
different. If purchasing a Baseboard with a CPU Card, the BIOS is correctly in-
stalled. If purchasing an additional card which uses a different processor, it should
come with a BIOS chip to replace the one installed on your Baseboad.
Support Software
FILELIST.TXT - View this file to see the files included in the support software.
PFLASH.EXE - This is the Flash Memory Writer utility that updates the BIOS by
uploading a new BIOS file to the programmable flash ROM chip on the mother-
board. To determine the BIOS version, check the last four numbers of the code
displayed on the upper left-hand corner of your screen during bootup.
NOTE: A binary BIOS file is no longer included with the support software.
Save the motherboard's BIOS file to a floppy diskette as soon as your system is
operational. See "Flash Memory Writer Utility" in this section to “Save Cur-
rent BIOS to File.”
III. INSTALLATION
Power Connection Procedures
1. After all jumpers and connections are made, close the system case cover.
2. Make sure that all switches are in the off position as marked by .
3. Connect the power supply cord into the power supply located on the back of
your system case as instructed by your system user's manual.
4. Connect the power cord into an power outlet that is equipped by a surge
protector.
5. You may then turn on your devices in the following order:
a. Your monitor
b. External SCSI devices (starting with the last device on the chain)
c. Your system power
6. The power LED on the front panel of the system case will light and the moni-
tor LED as well. The system will then run power-on tests. While the tests are
running, additional messages will appear on the screen. If you do not see
anything within 30 seconds from the time you turn on the power, the system
may have failed a power-on test. Recheck your jumper settings and connec-
tions or call your authorized dealer for assistance.
7. During power-on, hold down the <Delete> key to enter BIOS setup. Follow
the next section "BIOS SOFTWARE" for instructions.
(Power Connections)
III. INSTALLATION

8ASUS C-P55T2D User’s Manual
IV. BIOS
(Flash Memory Writer)
IV. BIOS SOFTWARE
Flash Memory Writer Utility
1. Enable "Boot Block Programming" jumper as shown in section III.
2. Make sure the system is running in real mode. This utility will not operate if
the system is under protected mode or virtual mode. This means that you
cannot reprogram the motherboard BIOS under the Windows environment or
with any memory management software, including HIMEM.SYS. The fol-
lowing describes the easiest way run your system from real mode:
• Boot from a floppy disk formatted with the "FORMATA:/S" command with-
out creating CONFIG.SYS and AUTOEXEC.BAT files.
• If you are using MS-DOS 6.x, you can bypass the AUTOEXEC.BAT and
CONFIG.SYS by pressing <F5> when "Starting MS-DOS . . . “ line is dis-
played on the screen.
• For Windows 95 users, press <F8> to enter the Microsoft Windows 95 Startup
Menu and then choose "Safe mode command prompt only"
3. You should copy the contents of the \FLASH directory to your hard disk drive.
Once you have accomplished the above tasks, you can run the Flash Memory
Writer utility. To run the utility, change to the directory containing
PFLASH.EXE and then at the DOS prompt, type: PFLASH <Enter>
The Flash Memory Writer Utility Screen:
IMPORTANT: Flash Type may also be "INTEL28F001BXT." If "unknown"
is after "Flash type --," then this ROM chip is not programmable or not sup-
ported with the PnP BIOS and therefore cannot be programmed by the Flash
Memory Writer.
This screen provides three command options, which you can invoke by typing the
corresponding number of the command and pressing <Enter> key. The following
describes each command:
ASUSTeK PNP BIOS
FLASH MEMORY WRITER V1.5
Copyright (C) 1995, ASUSTeK COMPUTER Inc.
Flash Type -- SST 29EE010
Current BIOS Revision: #401A0-xxxx
Choose one of the following:
1. Save Current BIOS To File
2. Update BIOS Main Block From File
3. Advanced Features
Enter Choice: [1]
Press ESC To Exit
xxxx denotes the current BIOS version stored in the Flash EPROM

ASUS C-P55T2D User’s Manual 9
IV. BIOS SOFTWARE
IV. BIOS
(Flash Memory Writer)
1. Save Current BIOS to File (Perform as soon as system is running)
This option allows you to copy the contents of the Flash memory chip into a file in
the \FLASH directory. This gives you a backup copy of the original motherboard
BIOS in case you need to re-install it. In such cases where the data on the chip get
lost or corrupted, you can reprogram the chip using this backup copy.
2. Update BIOS Main Block from File
This option updates the BIOS from a file on the disk. This can either be a new file or
a backup file created by the “Save Current BIOS to File” option. This will not
update the Boot Block if the Boot Block is different. You will be prompted with the
following if advanced features if necessary.
Boot Block of New BIOS is different from old one !!!
Please Use 'Advanced Feature' to flash whole bios !!!
3. Advanced Features
Selecting this option brings up the Advanced Features screen for clearing the PnP
configuration record and updating the motherboard BIOS.
To terminate the program and return to the DOS prompt, press the <Esc> key. Se-
lecting the third option displays the Advanced Features screen.
Clear PNP ESCD Parameter Block
This option erases the Plug-and-Play (PnP) configuration record.
Update BIOS Including Boot Block and ESCD
This option updates the Boot Block, the motherboard BIOS and the PnP ESCD
Parameter Block from a new BIOS file in the \FLASH directory.
Advanced Features
Flash Type -- SST 29EE010
Current BIOS Revision: #401A0-xxxx
Choose one of the following:
1. Clear PNP ESCD Parameter Block
2. Update BIOS Including Boot Block and ESCD
Enter Choice: [2]
Press ESC To Exit
xxxx denotes the current BIOS version stored in the Flash EPROM

10 ASUS C-P55T2D User’s Manual
IV. BIOS SOFTWARE
IV. BIOS
(Flash Memory Writer)
To select an option, type its corresponding number in the provided space and then
press the <Enter> key. Follow these procedure to update the PnPmotherboard BIOS.
1. Download the new BIOS by selecting the second command option from the
Advanced Features screen. The program displays a second screen prompting
you for the name of the BIOS file. Type in the complete name of the file,
including the file name extension, and then press the <Enter> key. The utility
then downloads the new BIOS file. The following message appears:
DO NOT TURN OFF THE SYSTEM IF THERE IS A PROBLEM!
If you encounter problems while downloading the new BIOS, DO NOT turn
off your system since this might prevent your system from
booting up. Just repeat the process, and if the problem still persists, download
the original BIOS file you saved to disk.
2. After successfully downloading the new BIOS file, exit the Flash Memory
Writer utility and then turn off your system. Set the jumper back to its de-
fault setting of Programming “Disabled.”
3. Turn on the system and hold down <DEL> to enter BIOS Setup. You must
load "Setup Default" to affect the new BIOS.
WARNING: If the Flash Memory Writer utility was not able to successfully
download a complete BIOS file, your system may not be able to boot up. If
this happens, your system will require service from your vendor.

ASUS C-P55T2D User’s Manual 11
IV. BIOS
(BIOS Setup)
The motherboard supports two programmable Flash ROM chips: 5 Volt and 12
Volt. Either of these memory chips can be updated when BIOS upgrades are re-
leased. Use the Flash MemoryWriter utility to download the new BIOS file into the
ROM chip as described in detail at the beginning of BIOS Software section IV.
All computer motherboards provide a Setup utility program for specifying the sys-
tem configuration and settings. If your motherboard came in a computer system, the
proper configuration entries may have already been made. If so, invoke the Setup
utility, as described later, and take note of the configuration settings for future refer-
ence; in particular, the hard disk specifications.
If you are installing the motherboard, reconfiguring your system or you receive a
Run Setup message, you will need to enter new setup information. This section
describes how to configure your system using this utility.
The BIOS ROM of the system stores the Setup utility. When you turn on the com-
puter, the system provides you with the opportunity to run this program. This ap-
pears during the Power-On Self Test (POST). Press the <Delete> key to call up the
Setup utility. If you are a little bit late pressing the mentioned key(s), POST will
continue with its test routines, thus preventing you from calling up Setup. If you
still need to call Setup, reset the system by simultaneously pressing the <Ctrl>, <Alt>
and <Delete> keys, or by pushing the Reset button on the system case. You can also
restart by turning the system off and then back on again. But do so only if the first
two methods fail.
When you invoke Setup, the CMOS SETUP UTILITY main program screen will
appear with the following options:
IV. BIOS SOFTWARE
6. BIOS Setup

12 ASUS C-P55T2D User’s Manual
Load Defaults
The “Load BIOS Defaults” option loads the minimized settings for troubleshoot-
ing. “Load Setup Defaults”, on the other hand, is for loading optimized defaults
for regular use. Choosing defaults at this level, will modify all applicable settings.
A section at the bottom of the above screen displays the control keys for this screen.
Take note of these keys and their respective uses. Another section just below the
control keys section displays information on the currently highlighted item in the
list.
Standard CMOS Setup
This “Standard CMOS Setup” option allows you to record some basic system hard-
ware configuration and set the system clock and error handling. If the motherboard
is already installed in a working system, you will not need to select this option
anymore. However, if the configuration stored in the CMOS memory on the board
gets lost or damaged, or if you change your system hardware configuration, you will
need to respecify the configuration values. The configuration values usually get lost
or corrupted when the power of the onboard CMOS battery weakens.
The above screen provides you with a list of options. At the bottom of this screen
are the control keys for use on this screen. Take note of these keys and their respec-
tive uses.
User-configurable fields appear in a different color. If you need information on the
selected field, press the <F1> key. The help menu will then appear to provide you
with the information you need. The memory display at the lower right-hand side of
the screen is read-only and automatically adjusts accordingly.
IV. BIOS SOFTWARE
IV. BIOS
(Standard CMOS)

ASUS C-P55T2D User’s Manual 13
Details of Standard CMOS Setup:
Date
To set the date, highlight the “Date” field and then press the page up/page down or
+/- keys to set the current date. Follow the month, day and year format. Valid
values for month, day and year are:
Month: 1 to 12
Day: 1 to 31
Year: up to 2099
Time
To set the time, highlight the “Time” field and then press the page up/page down or
+/- keys to set the current time. Follow the hour, minute and second format. Valid
values for hour, minute and second are:
Hour: 00 to 23
Minute: 00 to 59
Second: 00 to 59
time, just press the <Enter> key twice if you do not want to modify the current
You can bypass the date and time prompts by creating an AUTOEXEC.BAT file.
For information on how to create this file, please refer to the MS-DOS manual.
Hard Disks
This field records the specifications for all non-SCSI hard disk drives installed in
your system. The onboard PCI IDE connectors provide Primary and Secondary
channels for connecting up to four IDE hard disks or other IDE devices. Each chan-
nel can support up to two hard disks; the first of which is the “master” and the
second is the “slave”.
Specifications for SCSI hard disks need not to be entered here since they operate
using device drivers and are not supported by any the BIOS. If you install the
optional PCI-SC200 SCSI controller card into the motherboard (see section VI for
instructions). If you install other vendor’s SCSI controller card, please refer to their
respective documentations on how to install the required SCSI drivers.
IV. BIOS SOFTWARE
IV. BIOS
(Standard CMOS)

14 ASUS C-P55T2D User’s Manual
For IDE hard disk drives, you can:
• Use the Auto setting for detection during bootup (see below)
• Use the IDE HDD AUTO DETECTION in the main menu to automatically
enter the drive specifications, or you can:
• Enter the specifications yourself manually by using the “User” option
The entries for specifying the hard disk type include CYLS (number of cylinders),
HEAD(numberofread/writeheads),PRECOMP(writeprecompensation), LANDZ
(landing zone), SECTOR (number of sectors) and MODE. The SIZE field auto-
matically adjusts according to the configuration you specify. The documentation
that comes with your hard disk should provide you with the information regarding
the drive specifications.
The MODEentry is for IDE hard disks only, and can be ignored for MFM and ESDI
drives. This entry provides three options: Normal, Large, LBA, or Auto (see be-
low). Set MODE to the Normal for IDE hard disk drives smaller than 528MB; set
it to LBA for drives over 528MB that support Logical Block Addressing (LBA) to
allow larger IDE hard disks; set it to Large for drives over 528MB that do not sup-
port LBA. Large type of drive can only be used with MS-DOS and is very uncom-
mon. Most IDE drives over 528MB support the LBA mode.
Auto detection of hard disks on bootup (New Feature)
For each field: Primary Master, Primary Slave, Secondary Master, and Secondary
Slave, you can select Auto under the TYPE and MODE fields. This will enable auto
detection of your IDE drives during bootup. This will allow you to change your
hard drives (with the power off) and then power on without having to reconfigure
your hard drive type. If you use older hard drives which do not support this feature,
then you must configure the hard drive in the standard method as described above
by the "User" option.
NOTE: After the IDE hard disk drive information has been entered into BIOS, new
IDE hard disk drives must be partitioned (such as with FDISK) and then formatted
before data can be read from and write on. Primary IDE hard disk drives must have
its partition set to active (also possible with FDISK).
IV. BIOS SOFTWARE
IV. BIOS
(Standard CMOS)