AOpen AP5TC User Manual

AP5TC

User's Guide

Printed in Taiwan

PART NO.: 49.87907.001
DOC. NO. : AP5TC-1-E9801A

AP5TC

Mainboard

User's Guide

Document Number : AP5TC-1-E9801A
Model and Revision : For AP5TC revision 1.xx
Manual Version : English, revision A
Release Date : Jan 9, 1998

More help for latest information:
Taiwan http://www.aopen.com.tw
USA http://www.aopen-usa.com

http://www.aopenamerica.com

Europe http://www.aopen.nl

Copyright

Copyright  1998 by this company. All rights reserved. No part of this
publication may be reproduced, transmitted, transcribed, stored in a retrieval
system, or translated into any language or computer language, in any form or
by any means, electronic, mechanical, magnetic, optical, manual or otherwise,
without the prior written permission of this company.

ii

Disclaimer

This company makes no representations or warranties, either expressed or
implied, with respect to the contents hereof and specifically disclaims any
warranties, merchantability or fitness for any particular purpose. Any software
described in this manual is sold or licensed "as is". Should the programs
prove defective following their purchase, the buyer (and not this company, its
distributor, or its dealer) assumes the entire cost of all necessary servicing,
repair, and any incidental or consequential damages resulting from any defect
in the software. Further, this company reserves the right to revise this
publication and to make changes from time to time in the contents hereof
without obligation to notify any person of such revision or changes.

Intel and Pentium are registered trademarks of Intel Corporation.
XT/AT is a registered trademark of International Business Machines Corporation.
AMI is a registered trademark of American Megatrends Inc.
AWARD is a registered trademark of Award Software Inc.

Other brand and product names are trademarks and/or registered trademarks of their
respective holders.

iii

Organization

Chapter 1, Overview, covers the introduction and specifications of the system
board.

Chapter 2, Hardware Installation, describes hardware jumpers, connectors and
memory configuration. There are user friendly drawings to locate jumper and
connector.

Chapter 3, AWARD BIOS, explains the system BIOS and tells how to configure
the system by setting the BIOS parameters.

Appendix A, Frequently Asked Question, collects most frequently asked
question of this product.

Appendix B, Troubleshooting Guide, includes first aid information you need if
you meet trouble, the WWW address and worldwide service telephone/fax are
also included.

Appendix C, Jumper Table Summary, gives you a tabular summary of the
jumper settings discussed in Chapter 2.

iv

Conventions

The following conventions are used in this manual:

Text entered by user,
default settings,
recommended selections

<Enter>, <Tab>,<Ctl>, <Alt>,
<Ins>, <Del>, etc

Represent text input by the user,
default settings and recommended
selections

Represent the actual keys that you
have to press on the keyboard.

Note:

Gives bits and pieces of additional
information related to the current topic.

Warning:

Alerts you to any damage that might
result from doing or not doing specific
actions.

Caution:

Suggests precautionary measures to
avoid potential hardware or software
problems.

Important:

Reminds you to take specific action
relevant to the accomplishment of the
procedure at hand.

Tip:

Tells how to accomplish a procedure
with minimum steps through little
shortcuts.

v

Contents

CHAPTER 1 OVERVIEW

1.1 SPECIFICATIONS.................................................................................3

1.2 SUSPEND TO HARD DRIVE ..................................................................5

1.3 CPU THERMAL PROTECTION ..............................................................8

1.4 PCI SOUND CARD CONNECTOR...........................................................9

CHAPTER 2 HARDWARE INSTALLATION

2.1 JUMPERS AND CONNECTOR LOCATIONS..............................................2

2.2 JUMPERS........................................................................................... 4

2.2.1 Setting the CPU Voltage ............................................................5

2.2.2 Selecting the CPU Frequency....................................................8

2.2.3 Clearing the CMOS..................................................................12

2.3 CONNECTORS ..................................................................................13

2.3.1 Power Cable.............................................................................13

2.3.2 CPU Fan...................................................................................14

2.3.3 PS/2 Mouse..............................................................................14

2.3.4 Serial Devices (COM1/COM2).................................................15

2.3.5 USB Device (optional)..............................................................15

2.3.6 Floppy Drive.............................................................................16

2.3.7 Printer.......................................................................................16

2.3.8 IDE Hard Disk and CD ROM....................................................17

2.3.9 Hard Disk LED .........................................................................18

2.3.10 Panel Connector.....................................................................19

2.3.11 Keyboard................................................................................20

2.3.12 IrDA Connector ......................................................................21

2.3.13 SB-LINK .................................................................................22

2.4 INSTALLING THE SYSTEM MEMORY....................................................23

CHAPTER 3 AWARD BIOS

3.1 ENTERING THE AWARD BIOS SETUP MENU ........................................2

3.2 STANDARD CMOS SETUP .................................................................. 3

3.3 BIOS FEATURES SETUP.....................................................................6

3.4 CHIPSET FEATURES SETUP............................................................... 11

3.5 POWER MANAGEMENT SETUP........................................................... 17

vi

3.6 PNP/PCI CONFIGURATION SETUP ....................................................22

3.7 LOAD SETUP DEFAULTS ...................................................................26

3.8 LOAD TURBO DEFAULTS...................................................................26

3.9 INTEGRATED PERIPHERALS...............................................................27

3.10 PASSWORD SETTING ......................................................................32

3.11 IDE HDD AUTO DETECTION ...........................................................32

3.12 SAVE & EXIT SETUP.......................................................................32

3.13 EXIT WITHOUT SAVING....................................................................33

3.14 NCR SCSI BIOS AND DRIVERS .....................................................33

3.15 BIOS FLASH UTILITY......................................................................34

APPENDIX A FREQUENTLY ASKED QUESTION

APPENDIX B TROUBLESHOOTING

APPENDIX C JUMPER TABLE SUMMARY

vii

Chapter 1

Overview

The AP5TC is a high-performance Pentium-based system board that utilizes
the PCI/ISA architecture and Baby AT form factor. It integrates the Intel
82430TX PCIset, a Super I/O controller, and a PCI mode 4 enhanced IDE
controller with bus master and Ultra DMA/33 to enhance system performance.
It has 512KB pipelined-burst second-level cache onboard and support four
single in-line memory module (SIMM) plus two Dual in-line memory module
(DIMM) that allow to mix EDO and SDRAM memory and expansion up to a
maximum of 256MB. For the memory and IDE performance, the Intel 430TX
chipset is currently the fastest Pentium chipset in the market.

In addition, AP5TC also implements many special features as following.
Switching Power Regulator Although Linear Regulator is good enough for

AMD K6, AP5TC uses switching requlator to reserve the upgrade capability for
new generation CPU.

Over-current Protection AP5TC implements CPU core voltage 15A over­current protection to prevent any accident short circuit and prevent system
damage.

CPU Thermal Protection When CPU temperature is higher than a predefined
value, the CPU speed will automatically slow down and there will be warning
from BIOS and also ADM (AOpen Desktop Manager, similar as Intel LDCM), if
ADM is installed.

Full-range CPU core voltage This motherboard supports the CPU core
voltage from 1.3V to 3.5V, that can be applied to various CPU type in future.

Resetable Fuse AP5TC implements resetable fuses to prevent any accidental
short circuit caused by keyboard or USB devices hot plug.

PCI Sound Card connector The SB-LINK connector can be used to link
Creative-compatible PCI sound card. If you have a Creative PCI sound card
installed, it is necessary to link the card to this connector for compatibility issue
under DOS environment.

1-1

Overview

FCC DoC certificate The AP5TC has also passed FCC DoC test, this means
you can use any kind of housing with very low EMI radiation.

Powerful utility softwares supported AOpen Bonus Pack bundled CD
contains many useful utilities, such as ADM (Advanced Desktop Manager),
AOchip, Hardware Monitor utility, AcePhone, EasyAxess, Suspend to Hard
Drive utility, and BIOS flash utility.

1-2

1.1 Specifications

Overview

Form Factor
Board Size
CPU

System Memory

Second-level Cache
Chipset
Expansion Slots
Serial Port

Parallel Port

Floppy Interface

IDE Interface

USB Interface

PS/2 Mouse
Keyboard

RTC and Battery
BIOS

Baby AT
220 mm x 250 mm
Intel Pentium Processor P54C, PP/MT (P55C), AMD K5/K6,

Cyrix 6x86 and IDT C6.
FPM (Fast Page Mode) or EDO (Extended Data Output) 72-pin

SIMM x4, and SDRAM 168-pin x2 maximum 256MB.
256KB or 512KB pipelined-burst cache onboard.
Intel 82430TX PCIset
ISA x3 and PCI x4
Two serial ports UART 16C550 compatible, and the 3rd

UART for IR function.
One parallel port supports standard parallel port (SPP),

enhanced parallel port (EPP) or extended capabilities port
(ECP).

Floppy interface supports 3.5 inches drives with 720KB,

1.44MB or 2.88MB format or 5.25 inches drives with 360KB,

1.2MB format.
Dual-channel IDE interface support maximum 4 IDE hard

disks or CDROM, mode 4 , bus master hard disk drives and
Ultra DMA/33 mode hard drives are also supported.

Two USB ports supported by USB bracket, the BIOS also
supports USB driver to simulate legacy keyboard.

PS/2 mouse supported by PS/2 mouse bracket.
Default AT compatible keyboard, mini-DIN PS/2 keyboard

connector is optional.
RTC build in Intel PIIX4 chipset, Lithium (CR-2032) battery.
AWARD Plug-and-Play Flash ROM BIOS

1-3

Overview

Suspend to Hard
Drive

Switching Regulator
Over-current

Protection
CPU Thermal

Protection
SB-LINK connector

supported

Supported by BIOS, save your work to hard disk and resume
within a very short time. VESA compatible VGA and Sound
Blaster compatible sound card required.

High efficient switching regulator for future CPU.
CPU core voltage 15A over-current protection to prevent any

accident short circuit.
Warning when CPU temperature is higher than the predefined

value.
The SB-LINK connector can be used to link Creative PCI

sound card.

1-4

Overview

1.2 Suspend to Hard Drive

Suspend to Hard Drive saves your current work (system status, memory and
screen image) into hard disk, and then the system can be totally power off.
Next time, when power is on, you can resume your original work directly from
hard disk within few second without go through the Win95 booting process and
run your application again. If your memory is 16MB, normally, you need to
reserve at least 16MB HDD space to save your memory image. Note that you
have to use VESA compatible PCI VGA (AOpen PV70/PT70), Sound Blaster
compatible sound card and sound driver that supports APM (AOpen AW35 or
MP56) for Suspend to Hard Drive to work properly. Of course, we recommend
to use AOpen products for best compatibility.

Although Suspend to Hard Drive is so powerful, it is actually a little complicated
to set up this function. To use Suspend to Hard Drive, please make sure you
have read the following in detail.

1. Go into BIOS setup, Power Management
"Suspend to Disk".

2. Go into BIOS setup, PNP/PCI Configuration à PnP OS Installed, select
"No". This can give BIOS the capability to allocate system resources for
Suspend to Hard Drive.

3. Bootup your system into DOS command prompt. If you are Win'95 user,
Please restart your Windows 95 under "Command Prompt" by pressing "F8"
while system shows "Windows 95 Starting ...". Choose "Safe Mode
Command Prompt Only" from selection so that system will start in DOS
command prompt.

4. Copy AOZVHDD.EXE to the root directory of your C: drive.

Option 1: Use /file switch (applied to FAT16 file system):

5.
Please use following command to create a hidden file in the root directory of

your hard disk for Suspend to Hard Drive to save the system status and
memory image.

C:>AOZVHDD /c /file

Please make sure that you have enough continuous HDD space for
creating this hidden file. For example, if you have 32MB of system memory
and 4MB of VGA memory, you need at least 36MB (32MB + 4MB) of
continuous HDD space. If AOZVHDD failed to allocate the HDD space, you
may run "DEFRAG" Utility or "Disk Defragmenter" which come with MS­DOS or Win'95 to free HDD space.

à Suspend Mode Option, select

1-5

Overview

Option2: Use /partiton switch (applied to FAT16/FAT32 file system):

To create a separate partiton for Suspend to Hard Drive, please make sure
you have allocated a free partition. We suggest you reserve the free
partition which space is appropriate for your future memory expansion. For
example, if you have 32MB of system memory and 4MB of VGA memory
currently, but you plan to upgrade system memory to 64MB in the near
future, then you may reserve a 68MB (64MB+4MB) space by using a disk
utility (such as fdisk). Next, use following command to create a suspend
partition:

C:>AOZVHDD /c /partition

If there is no extra free partition and you don't want your data lost, please do
not use this partition method.

6. After creating above partition or hidden file, please reboot your system.

7. Push suspend switch (momentary mode) or use Win95 Suspend icon to
force system goes into Suspend to Hard Drive mode and then turn system
power off by power switch of your power supply.

8. Next time when you turn on your system, it will resume to your original work
automatically.

Warning: Note that Intel Bus Master and Ultra
DMA/33 IDE driver are not fully compatible with
Suspend to Hard Drive function, installing these
drivers may cause the system unstable. Under this
situation, please uninstall the drivers.

1-6

Warning: This function does not support SCSI hard

disks.

Overview

Tip: Following VGA card have been tested &
recognized as VESA compatible VGA device.

AOpen PV90 (Trident 9680)
AOpen PT60 (S3 Virge/BIOS R1.00-01)
AOpen PV60 (S3 Tiro64V+)
AOpen PT70 (S3 Virge/DX)
ProLink Trident GD-5440
ProLink Cirrus GD-5430
ProLink Cirrus GD-5446
ATI Mach 64 GX
ATI 3D RAGE II
Diamond Stealth64D (S3 868)
Diamond Stealth64V (S3 968)
KuoWei ET-6000.

Tip: Following Sound card have been tested OK for
Suspend to Hard Drive.

AOpen AW32
AOpen AW35
AOpen MP56
Creative SB 16 Value PnP
Creative SB AWE32 PnP
ESS 1868 PnP
If your sound card can not work after resume from

Suspend to Hard Drive, check your sound card
vendor see if there is driver to support APM, and
install it again.

Note: The USB function has not been tested for
Suspend to Hard Drive. If you find any unstable
problem, please go into BIOS, Integrated Peripherals
à USB Legacy Support. Disable the USB Legacy
function.

1-7

Overview

1.3 CPU Thermal Protection

This motherboard implements special thermal protection circuit below the CPU.
When temperature is higher than a predefined value, the CPU speed will
automatically slow down and there will be warning from BIOS and also ADM
(AOpen Desktop Manager, similar as Intel LDCM) or Hardware Monitor utility
software.

ADM is a very powerful network and hardware monitor software. If you do not
need network monitor function, you may also use Hardware Monitor utility,
which is a small utility for hardware monitoring. Both ADM and Hardware
Monitor utility are available on the bundled CD and our web site
(hhtp://www.aopen.com.tw).

CPU Thermal Protection is automatically implemented by BIOS and utility
software, no hardware installation is needed.

1-8

Overview

1.4 PCI Sound Card connector

AP5TC implements a SB-LINK connector to support Creative-compatible PCI
sound card. If you have a Creative-compatible PCI sound card installed, it is
necessary to link the card to SB-LINK connector for compatibility issue under
DOS environment.

1-9

Chapter 2

Hardware Installation

This chapter gives you a step-by-step procedure on how to install your system.
Follow each section accordingly.

Caution: Electrostatic discharge (ESD) can
damage your processor, disk drives, expansion
boards, and other components. Always
observe the following precautions before you
install a system component.

1. Do not remove a component from its
protective packaging until you are ready
to install it.

2. Wear a wrist ground strap and attach it to
a metal part of the system unit before
handling a component. If a wrist strap is
not available, maintain contact with the
system unit throughout any procedure
requiring ESD protection.

2-1

Hardware Installation

2.1 Jumpers and Connector Locations

The following figure shows the locations of the jumpers and connectors on the
system board:

I
S
A

3

HDD LED

PANEL

USB

KB1

PS2 MS

P
C
I
4

SB-LINK

BIOS

P
C
I

3

IrDA

PWR1

P

P

C

C

I

I

1

2

IDE1

I

I

S

S

A

A

2

1

FDC

IDE2

COM2

COM1

S

I
M
M

1

PRINTER

D

D

I

I

S

S

S

I

I

M

M

M

M

M

M

3

2

M

M

I

M

M

2

1

4

PiiX4

SW1

JP14

TX

JP4

FAN

JP12

JP5
JP6

2-2

Hardware Installation

Jumpers

SW1: DIP Switch for CPU voltage and clock ratio
JP4,JP5,JP6: CPU external (bus) clock
JP12: I/O Voltage
JP14: Clear CMOS

Connectors

KB1: AT keyboard connector
PWR1: AT (PS/2) power connector
PS2 MS: PS/2 mouse connector
USB: USB connector
COM1: COM1 connector
COM2: COM2 connector
FDC: Floppy drive connector
PRINTER: Printer connector
IDE1: IDE1 primary channel
IDE2: IDE2 secondary channel
FAN: CPU fan connector
IrDA: IrDA (Infrared) connector
HDD LED: HDD LED connector
PANEL: Front panel (Multifunction) connector
SB-LINK: Creative PCI sound card connector

2-3

Hardware Installation

3

3

2.2 Jumpers

Jumpers are made by pin headers and plastic connecting caps for the purpose of
customizing your hardware. Doing so requires basic knowledge of computer
hardware, be sure you understand the meaning of the jumpers before you change
any setting. The onboard jumpers are normally set to their default with optimized
settings.

On the mainboard, normally there is a bold line marked beside pin 1 of the jumper,
sometimes, there are numbers also. If we connect (short) plastic cap to pin 1 and
2, we will say set it at 1-2, and when we say jumper is open, that means no plastic
cap connected to jumper pins.

Open

1
2

Short

1
2

Jumper set at 1-2

1
2

Jumper set at 2-3

1
2

2-4

2.2.1 Setting the CPU Voltage

ON

ON

ON

ON

ON

ON

S4

ON
OFF
OFF
ON
OFF
OFF
OFF

S5

ON
ON
OFF
OFF
OFF
ON
ON

S6

ON
ON
ON
OFF
OFF
OFF
OFF

S7

ON
ON
ON
ON
ON
OFF

ON

S8

OFF
OFF
OFF
OFF
OFF
OFF
ON

Vcore

3.52V

3.45V

3.2V

2.9V

2.8V

2.2V

1.8V

Hardware Installation

SW1 is used to select CPU core
voltage (Vcore) and ratio, there
are totally eight switches on the
DIP. After installing a CPU,
remember to set the switch 4-8
to specify a proper Vcore.

1 2 3 4 5 6 7 8

2.9V

K6-166/200 or M2

1 2 3 4 5 6 7 8

2.8V

Intel P55C (MMX)

ON

1 2 3 4 5 6 7 8

3.52V

Cyrix 6x86 or AMD K5

1 2 3 4 5 6 7 8

3.45V

Intel P54C or IDT C6

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

2.2V

K6-266/300

1 2 3 4 5 6 7 8

1.8V

Reserved for future use

3.2V

AMD K6-233

2-5

Hardware Installation

Warning: Please make sure that you have installed CPU fan
properly if Intel PP/MT-233 or AMD K6 CPU is being selected
to use. It may cause your system unstable if you can not meet
the heat dissipation requirement from above CPU type. It is
recommended to adopt larger fan on these CPU for better air
flow in the system. Please refer to AOpen 's web site
(http://www.aopen.com.tw) to choose a proper CPU fan.

Tip: Normally, for single voltage CPU, Vcpuio (CPU I/O
Voltage) is equal to Vcore, but for CPU that needs dual voltage
such as PP/MT (P55C) or Cyrix 6x86L, Vcpuio is different from
Vcore and must be set to Vio (PBSRAM and Chipset Voltage).
The single or dual voltage CPU is automatically detected by
hardware circuit.

Tip: For supporting more different CPUs in future, this
motherboard uses five switchs to specify Vcore. There are 32
settings totally, and the range is from 1.3V to 3.5V.

CPU Type S4 S5 S6 S7 S8 Vcore

INTEL P54C Single Voltage OFF ON ON ON OFF 3.45V
INTEL MMX P55C Dual Voltage OFF OFF OFF ON OFF 2.8V
AMD K5 Single Voltage ON ON ON ON OFF 3.52V
AMD K6-166/200 Dual Voltage ON OFF OFF ON OFF 2.9V
AMD K6-233 Dual Voltage OFF OFF ON ON OFF 3.2V
AMD K6-266/300 Dual Voltage OFF ON OFF OFF OFF 2.2V
Cyrix 6x86 Single Voltage ON ON ON ON OFF 3.52V
Cyrix 6x86L Dual Voltage OFF OFF OFF ON OFF 2.8V
Cyrix M2 Dual Voltage ON OFF OFF ON OFF 2.9V
IDT C6 Single Voltage OFF ON ON ON OFF 3.45V

2-6

Hardware Installation

This motherboard supports the CPU core voltage from 1.3V to 3.5V, that can be
applied to the various CPU type in future. For your reference, all settings are
listed in the following table.

Vcore

1.30V

1.35V

1.40V

1.45V

1.50V

1.55V

1.60V

1.65V

1.70V

1.75V

1.80V

1.85V

1.90V

1.95V

2.00V

2.05V

2.0V

2.1V

2.2V

2.3V

2.4V

2.5V

2.6V

2.7V

2.8V

2.9V

3.0V

3.1V

3.2V

3.3V

3.4V

3.5V

S4

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

S5

OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON

S6

OFF
OFF
OFF
OFF

ON
ON
ON

ON
OFF
OFF
OFF
OFF

ON

ON

ON

ON
OFF
OFF
OFF
OFF

ON

ON

ON

ON
OFF
OFF
OFF
OFF

ON

ON

ON

ON

S7

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

ON
ON
ON
ON
ON
ON
ON

ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

ON

ON

ON

ON

ON

ON

ON

ON

S8

ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

2-7

Hardware Installation

JP12

1-2
3-4

I/O Voltage (Vio)

3.3 (default)

3.45V

JP12 is reserved for testing purposes only.
This jumper enables you to set the voltage of
the onboard chipset and PBSRAM (Vio). For
dual-voltage CPU, JP12 also functions as
CPU I/O voltage (Vcpuio) controller.

JP12

1 2 3

3.3V

(default)

JP12

1 2 3

3.45V

2.2.2 Selecting the CPU Frequency

Intel Pentium, Cyrix 6x86, AMD K5/K6 and IDT C6 CPU are designed to have
different Internal (Core) and External (Bus) frequency.

Core frequency = Ratio * External bus clock

2-8

S1

OFF
ON
ON
OFF
ON
ON
OFF

S2

OFF
OFF
ON
ON
OFF
ON
ON

S3

OFF
OFF
OFF
OFF
ON
ON
ON

CPU Frequency
Ratio

1.5x (3.5x)
2x

2.5x (1.75x)
3x
4x

4.5x

5x

Note: Intel PP/MT MMX 233MHz is using 1.5x jumper setting
for 3.5x frequency ratio, and AMD PR166 is using 2.5x
setting for 1.75x frequency ratio.

The ratio of Core/Bus frequency
is selected by the switch 1-3 of
SW1.

Hardware Installation

ON

ON

ON

ON

ON

ON

ON

JP4

1-2
2-3
1-2
2-3

JP5

2-3
1-2
2-3
1-2

1 2 3 4 5 6 7 8

1.5x (3.5x)

1 2 3 4 5 6 7 8

2x

1 2 3 4 5 6 7 8

2.5x (1.75x)

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

4x

1 2 3 4 5 6 7 8

4.5x

1 2 3 4 5 6 7 8

5x

3x

Note: Intel PP/MT 233MHz is using 1.5x jumper setting for

3.5x frequency ratio, and AMD PR166 is using 2.5x setting for

1.75x frequency ratio.

JP6

1-2
1-2
2-3
2-3

CPU External Clock

60MHz
66MHz
75MHz

83.3MHz

JP4, JP5 and JP6 are the
selections of CPU external
clock (bus clock), which is
actually the clock from clock
generator.

JP4 JP5 JP6

1 2 3 1 2 3 1 2 3

60MHz

JP4 JP5 JP6

1 2 3 1 2 3 1 2 3

75MHz

JP4 JP5 JP6

1 2 3 1 2 3 1 2 3

66MHz

JP4 JP5 JP6

1 2 3 1 2 3 1 2 3

83.3mhz

2-9

Hardware Installation

Warning: INTEL TX chipset supports only 60/66MHz
external CPU bus clock, the 75/83.3MHz settings are for
internal test only, set to 75/83.3MHz exceeds the

specification of TX chipset, which may cause serious
system damage.

Caution: Following table are possible settings of current

CPU available on the market. The correct setting may
vary because of new CPU product, refer to your CPU
specification for more details.

Warning: Cyrix 6x86 P200+ uses 75MHz external clock,
the jumper setting shown on the table below is for user's
convenient. It may cause serious system damage to use
75MHz clock.

INTEL
Pentium

P54C 90 90MHz = 1.5x 60MHz OFF OFF OFF 1-2 & 2-3 & 1-2
P54C 100 100MHz = 1.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
P54C 120 120MHz = 2x 60MHz ON OFF OFF 1-2 & 2-3 & 1-2
P54C 133 133MHz = 2x 66MHz ON OFF OFF 2-3 & 1-2 & 1-2
P54C 150 150MHz = 2.5x 60MHz ON ON OFF 1-2 & 2-3 & 1-2
P54C 166 166MHz = 2.5x 66MHz ON ON OFF 2-3 & 1-2 & 1-2
P54C 200 200MHz = 3x 66MHz OFF ON OFF 2-3 & 1-2 & 1-2

INTEL
Pentium
MMX

PP/MT 150 150MHz = 2.5x 60MHz ON ON OFF 1-2 & 2-3 & 1-2
PP/MT 166 166MHz = 2.5x 66MHz ON ON OFF 2-3 & 1-2 & 1-2
PP/MT 200 200MHz = 3x 66MHz OFF ON OFF 2-3 & 1-2 & 1-2
PP/MT 233 233MHz = 3.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2

AMD K5 CPU Core

PR90 90MHz = 1.5x 60MHz OFF OFF OFF 1-2 & 2-3 & 1-2
PR100 100MHz = 1.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
PR120 90MHz = 1.5x 60MHz OFF OFF OFF 1-2 & 2-3 & 1-2
PR133 100MHz = 1.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
PR166 116MHz = 1.75x 66MHz ON ON OFF 2-3 & 1-2 & 1-2

CPU Core
Frequency

CPU Core
Frequency

Frequency

Ratio External

Bus Clock

Ratio External

Bus Clock

Ratio External

Bus Clock

S1 S2 S3 JP4 & JP5 & JP6

S1 S2 S3 JP4 & JP5 & JP6

S1 S2 S3 JP4 & JP5 & JP6

2-10

Hardware Installation

AMD K6 CPU Core

PR2-166 166MHz = 2.5x 66MHz ON ON OFF 2-3 & 1-2 & 1-2
PR2-200 200MHz = 3x 66MHz OFF ON OFF 2-3 & 1-2 & 1-2
PR2-233 233MHz = 3.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
PR2-266 266MHz= 4x 66MHz ON OFF ON 2-3 & 1-2 & 1-2
PR2-300 300MHz= 4.5x 66MHz ON ON ON 2-3 & 1-2 & 1-2

Cyrix 6x86
& 6x86L

P150+ 120MHz = 2x 60MHz ON OFF OFF 1-2 & 2-3 & 1-2
P166+ 133MHz = 2x 66MHz ON OFF OFF 2-3 & 1-2 & 1-2
P200+ 150MHz = 2x 75MHz ON OFF OFF 1-2 & 2-3 & 2-3

Cyrix M2 CPU Core

MX-PR166 150MHz = 2.5x 60MHz ON ON OFF 1-2 & 2-3 & 1-2
MX-PR200 166MHz =

MX-PR233 200MHz =

MX-PR266 233MHz = 3.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2

IDT C6 CPU Core

C6-150 150MHz = 2x 75MHz ON OFF OFF 1-2 & 2-3 & 2-3
C6-180 180MHz = 3x 60MHz OFF ON OFF 1-2 & 2-3 & 1-2
C6-200 200MHz = 3x 66MHz OFF ON OFF 2-3 & 1-2 & 1-2

Frequency

CPU Core
Frequency

Frequency

150MHz=

166MHz=3x2x

Frequency

Ratio External

Ratio External

Ratio External

2.5x
2x

Ratio External

Bus Clock

Bus Clock

Bus Clock

66MHz
75MHz
66MHz

83.3MHz

Bus Clock

S1 S2 S3 JP4 & JP5 & JP6

S1 S2 S3 JP4 & JP5 & JP6

S1 S2 S3 JP4 & JP5 & JP6

ONONON

OFFONON

S1 S2 S3 JP4 & JP5 & JP6

OFF

OFF

OFF

2-3 & 1-2 & 1-2

OFF

1-2 & 2-3 & 2-3

OFF

2-3 & 1-2 & 1-2

OFF

2-3 & 1-2 & 2-3

Note: Cyrix 6x86 and AMD K5 CPU use P-rating for the
reference of CPU benchmark compared with INTEL P54C,
their internal core frequency is not exactly equal to P-rating
marked on the CPU. For example, Cyrix P166+ is 133MHz but
performance is almost equal to P54C 166MHz and AMD
PR133 is 100MHz but performance is almost equal to INTEL
P54C 133MHz.

Note: INTEL TX chipset does not support CPU with 50/55MHz
external bus clock, so that P54C 75MHz, Cyrix P120+,P133+
and AMD PR75 are not supported by this mainboard.

2-11

Hardware Installation

2.2.3 Clearing the CMOS

JP14

1-2

2-3

Clear CMOS

Normal operation
(default)
Clear CMOS

You need to clear the CMOS if you forget your
system password. To clear the CMOS, follow
the procedures listed below:

Normal Operation

(default)

The procedure to clear CMOS:

1. Turn off the system power.

2. Locate

3. Return

4. Turn on the system power.

5. Press

JP14 and short pins 2-3 for a few seconds.
JP14 to its normal setting by shorting pins 1-2.

during bootup to enter the BIOS Setup Utility and specify a new

password, if needed.

JP14

1 2 3

JP14

1 2 3

Clear CMOS

2-12

Hardware Installation

(+5V)

2.3 Connectors

2.3.1 Power Cable

A standard baby AT (PS/2) power supply has two cables with six wires on each.
Plug in these cables to the onboard power connector in such a way that all the
black wires are in the center. The power connector is marked as PWR1 on the
system board.

Caution: Make sure that the power supply is
off before connecting or disconnecting the
power cable.

Black wire
(GND)

Red wire

PWR1

2-13