AOpen AP59S User Manual

AP59S

User's Guide

Printed in Taiwan

PART NO.:49.87501.021
DOC. NO.: AP59S-1-E9811C

AP59S

Mainboard

User's Guide

Document Number : AP59S-1-E9811C
Model and Version : For AP59S version 1.xx
Manual Version : English, version C
Release Date : Oct 29, 1998

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

http://www.aopenamerica.com
http://www.aopenusa.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 and special features.

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

Chapter 2 Hardware Installation

2.1 Jumper 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............................................................13

2.3 Connectors ...............................................................................14

2.3.1 Power Cable......................................................................14

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

2.3.3 PS/2 Mouse.......................................................................15

2.3.4 Serial Devices....................................................................15

2.3.5 USB Device .......................................................................16

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

2.3.7 Printer................................................................................17

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

2.3.9 Hard Disk LED...................................................................19

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

2.3.11 Keyboard .........................................................................21

2.3.12 IrDA Connector................................................................22

2.4 Configuring the System Memory............................................23

Chapter 3 Award BIOS

3.1 Entering the Award BIOS Setup Menu .....................................2

3.2 Standard CMOS Setup...............................................................3

vi

3.3 BIOS Features Setup..................................................................6

3.4 Chipset Features Setup ........................................................... 11

3.5 Power Management Setup.......................................................15

3.6 PNP/PCI Configuration Setup .................................................19

3.7 Load Setup Defaults.................................................................23

3.8 Load Turbo Defaults ................................................................23

3.9 Integrated Peripherals .............................................................24

3.10 Password Setting...................................................................29

3.11 IDE HDD Auto Detection........................................................29

3.12 Save & Exit Setup...................................................................29

3.13 Exit without Saving................................................................30

3.14 NCR SCSI BIOS and Drivers..................................................30

3.15 BIOS Flash Utility...................................................................30

Appendix A Frequently Asked Question
Appendix B Troubleshooting
Appendix C Jumper Table Summary

vii

Chapter 1

Overview

AP59S is a high-performance Pentium-based system board that utilizes SIS
5591 AGPset on Baby AT PCI/ISA platform. This motherboard supports new
architectures such as high speed AGP graphic port, SDRAM, Ultra DMA/33,
Bus master IDE and USB port. It has 512KB pipelined-burst second-level

cache onboard and support two single in-line memory module (SIMM) plus two
Dual in-line memory module (DIMM) that allows to mix EDO and SDRAM
memory and expansion up to a maximum of 768MB.

In addition, AP59S also implements:

High Efficient Synchronous Switching Regulator

Most of the current switching designs are Asynchronous mode, which from the
technical point of view, still consumes very high power as well as heat. AP59S
implements high efficient synchronous switching design that the temperature of
MOS FET is far less than Schottky diode of Asynchronous design.

CPU core current protection

AP59S implements CPU core voltage 15A over-current protection to prevent
any accident short circuit and prevent system damage.

CPU Thermal Protection (Optional)

AP59S has a special thermal detection circuit to have warning through
application software when the temperature is higher than a predefined value.

CPU and Housing Fan Monitoring

AP59S has one more "fan monitoring" function to prevent system overheat.
There are two fan connectors, one is for CPU and the other can be a extra
housing fan. The system will report and alarm fan malfunction though utility
software such as Hardware Monitor utility (named AOhw101, where 101 means
version number).

1-1

Overview

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

AP59S implements resetable fuses to prevent any accidental short circuit
caused by keyboard or USB devices hot plug.

Multi-language BIOS (Optional BIOS)

This breakthrough will help you set BIOS items without the language barrier.

FCC DoC certificate

AP59S has passed FCC DoC test. The radiation is very low, you can use any
kind of housing.

Powerful utility software support

AOpen Bonus Pack bundled CD contains many useful utilities, such as Norton
Antivirus, Hardware Monitor utility, and BIOS flash utility, etc.

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 242 mm
Intel Pentium Processor P54C, PP/MT (P55C), AMD K5/

K6, Cyrix 6x86/M2 and IDT WinChip C6.
FPM or EDO 72-pin SIMM x 2, and SDRAM 168-pin x 2.

The maximum is 768MB.
512KB pipelined-burst cache onboard
SiS 5591 AGPset
ISA x2 and PCI x3
Two serial ports UART 16C550 compatible
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 chipset, Lithium (CR-2032) battery.
AWARD Plug-and-Play Flash ROM BIOS

1-3

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

PWR1

COM1

SW

1

CPUFAN1

CPUFAN2

FAN

2.1 Jumper and Connector Locations

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

I
S

A

2

PANEL

USB

I
S

A

1

HDD LED

5595

IDE1 IDE2

BIO

JP14

PS2 MS

S

PCI

3

Super
I/O

PCI

2

IrDA

PCI

1

COM2

PRINTER

A
G
P

FDC

KB1

S

S

D

D

I
M
M

1

I

I

I

M

M

M

M

M

M

2

1

2

5591

JP12

JP5

JP6

JP4

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
CPUFAN1: 3-pin CPU fan connector
CPUFAN2: 2-pin CPU fan connector
FAN: 3-pin housing fan connector
IrDA: IrDA (Infrared) connector
HDD LED: HDD LED connector
PANEL: Front panel (Multifunction) 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

For your convenience to install a CPU, this motherboard also use a DIP switch to
set CPU voltage and frequency ratio. The following figure simply shows you how
to set this DIP switch, please see also to next sections for more details.

ON

1 2 3 4 5 6 7 8

OFF ON

2-4

2.2.1 Setting the CPU Voltage

S4

ON
OFF
ON
OFF
ON
OFF
OFF
OFF

S5

ON
ON
OFF
OFF
OFF
OFF
ON
ON

S6

ON
ON
ON
ON
OFF
OFF
OFF
OFF

S7

ON
ON
ON
ON
ON
ON
OFF

ON

S8

OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON

Vcore

3.52V

3.45V

3.3V

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 this
DIP. After installing a CPU,
remember to set the switch 4-8
to specify a proper Vcore.

ON

1 2 3 4 5 6 7 8

3.2V

K6-233

ON

1 2 3 4 5 6 7 8

2.9V

K6-166/200 or M2

ON

1 2 3 4 5 6 7 8

3.52V

6x86, K5 or IDT C6

ON

1 2 3 4 5 6 7 8

3.45V

P54C

ON

1 2 3 4 5 6 7 8

3.3V

IDT C6

ON

1 2 3 4 5 6 7 8

2.8V

P55C (MMX)

ON

1 2 3 4 5 6 7 8

2.2V

K6-266/300

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.

Warning: If your CPU is IDT C6, note that this processor
supports one of two voltage range, 3.135 ~ 3.465V ( 3.45V)
and 3.45 ~ 3.6V ( 3.52V). See the CPU specification to set the
correct voltage.

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 ONONON

OFFONONONON

OFF
OFF

2-6

3.52V

3.3V

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

2.1V

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
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

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

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

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

2-7

Hardware Installation

3

3

JP12

1-2
3-4

I/O Voltage (Vio)

3.3V (default)

3.43V

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, this jumper also functions
as CPU I/O voltage (Vcpuio) controller.

JP12

1
2

3.3V

JP12

1
2

3.43V

(default)

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

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

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

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.

2-8

Hardware Installation

ON

1 2 3 4 5 6 7 8

3x

ON

1 2 3 4 5 6 7 8

4x

JP6

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

ON

1 2 3 4 5 6 7 8

1.5x (3.5x)

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

2.5x (1.75x)

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.

Note: AP59S can automatically detect the CPU type and
select CPU burst mode of SIS chipset. (Only SiS chipset
provide this feature.) For Cyrix CPU, AP59S will set to Linear
Mode for better performance. For Intel and AMD CPU, Toggle
Mode is set.

JP5

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

JP4

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

2x

SDRAM

60MHz
66MHz
75MHz
75MHz
83MHz
90MHz
100MHz

PCI

30MHz
33MHz
32MHz
37MHz
32MHz
30MHz
33MHz

ON

1 2 3 4 5 6 7 8

4.5x

ON

1 2 3 4 5 6 7 8

5x

AGP

60MHz

66MHz
64MHz
75MHz
64MHz
60MHz
66MHz

2-9

Hardware Installation

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

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

actually the clock from clock generator.

JP6 JP5 JP4

1

1

2

2

83MHz

Warning: SIS 5591 chipset supports maximum 83MHz
external CPU bus clock, the 90MHz and 100MHz settings
are for internal test only, set to 90MHz or 100MHz
exceeds the specification of 5591 chipset, which may
cause serious system damage.

JP6 JP5 JP4

1

1

2

1

2

2

60MHz

JP6 JP5 JP4

1

1

2

1

2

2

75MHz (Asynchronous)

JP6 JP5 JP4

1

1

1
2

2

1

2

2

90MHz

JP6 JP5 JP4

1

1

2

1

2

2

66MHz

JP6 JP5 JP4

1

1

2

1

2

2

75MHz (Synchronous)

JP6 JP5 JP4

1

1

2

1

2

2

100MHz

2-10

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.

Hardware Installation

INTEL
Pentium

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

INTEL
Pentium
MMX

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

AMD K5 CPU Core

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

CPU Core
Frequency

CPU Core
Frequency

Frequency

Ratio External

Bus Clock

Ratio External

Bus Clock

Ratio External

Bus Clock

S1 S2 S3 JP6 & JP5 & JP4

S1 S2 S3 JP6 & JP5 & JP4

S1 S2 S3 JP6 & JP5 & JP4

AMD K6 CPU Core

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

Cyrix 6x86
& 6x86L

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

Frequency

CPU Core
Frequency

Ratio External

Bus Clock

Ratio External

Bus Clock

S1 S2 S3 JP6 & JP5 & JP4

S1 S2 S3 JP6 & JP5 & JP4

2-11

Hardware Installation

Cyrix M2 CPU Core

Frequency

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

150MHz =

MX-PR233 200MHz =

166MHz =3x2x
MX-PR266 233MHz = 3.5x 66MHz OFF OFF OFF 1-2 & 2-3 & 2-3
MX-PR300 225MHz =

233MHz =

240MHz =

IDT C6 CPU Core

Frequency

C6-150 150MHz = 2x 75MHz ON OFF OFF 2-3 & 2-3 & 1-2
C6-180 180MHz = 3x 60MHz OFF ON OFF 2-3 & 2-3 & 2-3
C6-200 200MHz = 3x 66MHz OFF ON OFF 1-2 & 2-3 & 2-3
C6-225 225MHz = 3x 75MHz OFF ON OFF 2-3 & 2-3 & 1-2
C6-240 240MHz = 4x 60MHz ON OFF ON 2-3 & 2-3 & 2-3

Ratio External

2.5x
2x

3x

3.5x
4x

Ratio External

Bus Clock

66MHz
75MHz
66MHz

83.3MHz

75MHz
66MHz
60MHz

Bus Clock

S1 S2 S3 JP6 & JP5 & JP4

ONONON

OFFONON

OFF
OFF
ON

S1 S2 S3 JP6 & JP5 & JP4

OFF

OFF

ON
OFF
OFF

OFF

1-2 & 2-3 & 2-3

OFF

2-3 & 2-3 & 1-2

OFF

1-2 & 2-3 & 2-3

OFF

1-2 & 2-3 & 1-2

OFF

2-3 & 2-3 & 1-2

OFF

1-2 & 2-3 & 2-3

ON

2-3 & 2-3 & 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.

2-12

2.2.3 Clearing the CMOS

1

3

1

3

Hardware Installation

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:

JP14

2

Normal

Operation

JP14

2

Clear

CMOS

(default)

The procedure to clear CMOS:

1. Turn off the system power.

2. Locate JP14 and short pins 2-3 for a few seconds.

3. Return JP14 to its normal setting by shorting pins 1-2.

4. Turn on the system power.

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

password, if needed.

2-13

Hardware Installation

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 (+5V)

PWR1

2.3.2 CPU Fan

Plug in the fan cable to the fan connectors onboard. The fan connectors are
marked FAN, CPUFAN1 and CPUFAN2 on the system board. You can plug the
CPU fan cable to both the 2-pin fan connector FAN and the 3-pin fan connector
CPUFAN1. CPUFAN2 can be reserved for the housing fan. Note that only
CPUFAN1 and CPUFAN2 supports the fan monitoring function, because 3-pin fan
has an extra pin called SENSE, which periodically sends fan signal out.

GND

2-14

SENSE

+12V

CPUFAN1
CPUFAN2

+12V

GND

FAN

2.3.3 PS/2 Mouse

5

6

1

1

Hardware Installation

To connect a PS/2 mouse, insert the
PS/2 mouse bracket connector to PS2
MS on the system board. Then plug in
the PS/2 mouse cable to the mouse
port on the bracket.

Pin

1
2
3
4
5
6

Description

MS DATA
NC
GND
+5V
MS CLK
NC

3
1
2

PS2 MS

2.3.4 Serial Devices (COM1/COM2)

To support serial devices, insert the serial device connector into the serial
port on the bracket. Plug in the 10-pin flat cable to the appropriate onboard
connectors. The serial port 1 connector is marked as COM1 and the serial
port 2 connector is marked as COM2 on the system board.

2

10

2

9

10

9

COM1

COM2

2-15

Hardware Installation

2

2.3.5 USB Device (optional)

You need a USB bracket to
have your system to support
additional USB device(s). To
attach a USB bracket, simply
insert the bracket cable to the
onboard USB connector marked
as USB.

Pin

1
3
5
7
9

Description

V0
D0­D0+
GND
NC

Pin

2
4
6
8
10

Description

V1
D1­D1+
GND
NC

1

2

9 10

USB

2.3.6 Floppy Drive

Connect the 34-pin floppy drive cable to the floppy drive connector marked as

FDC on the system board.

1

34

33

FDC

2-16

Hardware Installation

1

2

2.3.7 Printer

Plug in the 26-pin printer flat cable to the onboard parallel connector
marked as PRINTER on the board.

26

25

PRINTER

2.3.8 IDE Hard Disk and CD ROM

This mainboard supports two 40 pin IDE connectors marked as
IDE1 and IDE2. IDE1 is also known as primary channel and
IDE2 as secondary channel, each channel supports two IDE
devices that makes total of four devices.

In order to work together, the two devices on each channel must
be set differently to master and slave mode, either one can be
hard disk or CDROM. The setting as master or slave mode
depends on the jumper on your IDE device, please refer to your
hard disk and CDROM manual accordingly.

Connect your first IDE hard disk to master mode of the primary
channel. If you have second IDE device to install in your
system, connect it as slave mode on the same channel, and the
third and fourth device can be connected on secondary channel
as master and slave mode respectively.

2-17

Hardware Installation

1

40

2

39

1

40

2

39

(1st)

(2nd)

IDE1

IDE2

Caution: The specification of IDE cable is
maximum 46cm (18 inches), make sure your
cable does not excess this length.

Caution: For better signal quality, it is
recommended to set far end side device to
master mode and follow the suggested
sequence to install your new device . Please
refer to following figure.

IDE1 (Primary Channel)

Slave

IDE2 (Secondary Channel)

Slave
(4th)

Master

Master

(3rd)

2-18

2.3.9 Hard Disk LED

4

4

4

Hardware Installation

The HDD LED connector is marked as HDD
LED on the board. This connector is designed
for different type of housing, actually only two
pins are necessary for the LED. If your
housing has four pin connector, simply plug it
in. If you have only two pin connector, please
connect to pin 1-2 or pin 3-4 according to the
polarity.

+

1
2

-

3

-

+

HDD LED

4-pin connector

2.3.10 Panel Connector

The Panel (multifunction) connector is a 20­pin connector marked as PANEL on the
board. Attach the power LED, keylock,
speaker, reset switch, and suspend switch
connectors to the corresponding pins as
shown in the figure.

Some housings have a five-pin connector for
the keylock and power LED Since power
LED and keylock are aligned together, you
can still use this kind of connector.

Pin

1
2
3
4

+

-

-

Description

HDD LED
GND
GND
HDD LED

1
2
3

+

HDD LED

2-pin connector

at pin 1-2

GND

KEYLOCK

GND

RESET

POWER LED

SPEAKER

+5V

GND

NC

SPEAKER

2-pin connector

1

11

10 20

PANEL

+

1
2

-

3

-

+

HDD LED

at pin 3-4

+5V
GND
NC
GND
SUSPEND SW
SUSPEND SW
GND
NC
RESET
GND

2-19

Hardware Installation

1

111020

+

+++

+

10

20

Keylock

Power LED

Suspend SW

Speaker

PANEL

Other housings may have a 12-pin
connector. If your housing has this
type of connector, connect it to
PANEL as shown in the figure. Make
sure that the red wire of the
connector is connected to +5V.

Note: If your housing comes with Turbo switch
connector, you may use this connector for Suspend
switch functions.

Note: Pressing the Suspend switch allows you to
manually force the system to suspend mode. However,
this is possible only if the Power Management function in
the BIOS Setup menu is enabled.

Reset

1

11

PANEL

+5V

2-20

Hardware Installation

KB1

2.3.11 Keyboard

The onboard keyboard connector is a five-pin AT-compatible connector marked as
KB1. The view angle of drawing shown here is from back panel of the housing.

Note: The mini DIN PS/2 keyboard connector
is optional.

PCB

2-21

Hardware Installation

2.3.12 IrDA Connector

Serial port 2 can be configured to support wireless infrared module, with
this module and application software such as Laplink, user can transfer
files to or from laptops, notebooks, PDA and printers. This mainboard
supports IrDA (115Kbps, 1 meter) as well as ASK-IR (19.2Kbps).

Install infrared module onto IrDA
connector and enable infrared function
from BIOS setup, make sure to have
correct orientation when you plug onto
IrDA connector.

Note: Onboard serial port 2 (COM2) will not be
available after IrDA connector is enabled.

1
2
3
4
5
6

IrDA

Pin

1
2
3
4
5
6

Description

+5V
NC
IRRX
GND
IRTX
+3.3V

2-22

Hardware Installation

SIMM1

SIMM2

168

2.4 Configuring the System Memory

Pin 1 of
DIMM1

Pin 1 of

DIMM2

This mainboard has two 72 pin SIMM
sockets (Single-in-line Memory Module)
and two 168 pin DIMM socket (Dual-in-line
Memory Module) that allow you to install

system memory from minimum 8MB up to

Pin 1 of

maximum 768MB. Note that both SIMMs in
this board must be in the same size and type.

Pin 1 of

The SIMM supported by this mainboard can be identified by 4 kinds of factors:
I. Size: single side, 1Mx32 (4MB), 4Mx32 (16MB), 16Mx32 (64MB), and double

side, 1Mx32x2 (8MB), 4Mx32x2 (32MB), 16Mx32x2 (128MB).

II. Speed: 60ns or 70ns access time
III. Type: FPM (Fast page mode) or EDO (Extended data output)
IV. Parity: without parity (32 bit wide) or with parity (36 bit wide).

The DIMM supported by this motherboard are always 64-bit wide DIMMs, which
can be identified by following factors:

I. Size: single side, 1Mx64 (8MB), 2Mx64 (16MB), 4Mx64 (32MB), 8Mx64

(64MB), 16Mx64 (128MB), and double side, 1Mx64x2 (16MB), 2Mx64x2
(32MB), 4Mx64x2 (64MB), 8Mx64x2 (128MB), 16Mx64x2 (256MB).

Tip: Here is a trick to check if your DIMM is
single-side or double-side -- if there are traces
connected to golden finger pin 114 and pin 129 of
the DIMM, the DIMM is probably double-side;
otherwise, it is single-side. Following figure is for
your reference.

Pin 129

Pin 114

2-23

Hardware Installation

II. Speed:

SDRAM: normally marked as as -12, which means the clock cycle time is 12ns

and maximum clock of this SDRAM is 83MHz. Sometimes you can also find
the SDRAM marked as -67, which means maximum clock is 67MHz.

EDO: the access time of EDO RAM can be 60ns or 70ns.
III. Buffered and non-buffered: This motherboard supports non-buffered

DIMMs. You can identify non-buffered DIMMs and buffered DIMMs according
to the position of the notch, following figure is for your reference:

Reserved

non-buffered

buffered

Because the positions are different, only non-buffered DIMMs can be inserted into

the DIMM sockets on this motherboard. Although most of DIMMs on current
market are non-buffered, we still recommend you to ask your dealer for the
correct type.

IV. 2-clock and 4-clock signals: Although both of 2-clock and 4-clock signals

are supported by this motherboard, we strongly recommend you to choose 4­clock SDRAM in consideration of reliability.

Tip: To identify 2-clock and 4-clock SDRAM, you
may check if there are traces connected to golden
finger pin 79 and pin 163 of the SDRAM. If there
are traces, the SDRAM is probably 4-clock;
Otherwise, it is 2-clock.

V. Parity: This motherboard supports standard 64 bit wide (without parity)

DIMMs.

VI. SPD support: BIOS will automatically detect DIMM with SPD, and set to

appropriate timing. DIMMs without SPD are still able to work fine on this
board, but BIOS POST screen will give you a warning message that you use a
DIMM without SPD.

2-24

Hardware Installation

There is no jumper setting required for the memory size or type. It is
automatically detected by the system BIOS. You can use any single side SIMM
and DIMM combination list below for SIMM or DIMM socket, and the total memory
size is to add them together. This motherboard supports maximum 768 MB
system memory. To achieve this, you may install two 256MB DIMMs and two
128MB SIMMs.

SIMM1 SIMM2 Subtotal of

None None 0MB
4MB 4MB 8MB
8MB 8MB 16MB
16MB 16MB 32MB
32MB 32MB 64MB
64MB 64MB 128MB
128MB 128MB 256MB

DIMM1 Size of DIMM1 DIMM2 Size of DIMM2

None 0MB None 0MB
8MB 8MB 8MB 8MB
16MB 16MB 16MB 16MB
32MB 32MB 32MB 32MB
64MB 64MB 64MB 64MB
128MB 128MB 128MB 128MB
256MB 256MB 256MB 256MB

Bank0

Total Memory Size = Subtotal of SIMM1 + Subtotal of SIMM2
+ Size of DIMM1 + Size of DIMM2

Warning: It is not recommanded to use SIMM and
SDRAM DIMM together unless you have 5V tolerance
SDRAM (such as Samsung or TI). The FPM/EDO
operate at 5V while SDRAM operates at 3.3V. If you
combine them together the system will temporary work
fine; however after a few months, the SDRAM 3.3V data
input will be damaged by 5V FPM/EDO data output line.

2-25

Hardware Installation

Caution: Make sure that you install the same SIMM type
and size for each bank.

Caution: There are some old DIMMs made by EDO or
FPM memory chip, they can only accept 5V power and
probably can not fit into the DIMM socket, make sure you
have 3.3V true SDRAM DIMM before your insert it.

The driving capability of new generation chipset is limited because the lack of
memory buffer (to improve performance). This makes DRAM chip count an
important factor to be taking into consideration when you install SIMM.
Unfortunately, there is no way that BIOS can identified the correct chip count, you
need to calculate the chip count by yourself. The simple rule is: By visual
inspection, use only SIMM with chip count less than 24 chips.

Warning: Do not install any SIMM that contains more than 24
chips. SIMMs contain more than 24 chips exceed the chipset
driving specification. Doing so may result in unstable system
behavior.

Warning: Although Intel SIS chipset supports x4 SDRAM chip.
Due to loading issue, it is not recommended to use this kind of
SDRAM.

2-26

Tip: The SIMM/DIMM chip count can be calculated by following

example:

1. For 32 bit non-parity SIMM using 1M by 4 bit DRAM chip,
32/4=8 chips.

2. For 36 bit parity SIMM using 1M by 4 bit DRAM chip,
36/4=9 chips.

3. For 36 bit parity SIMM using 1M by 4 bit and 1M by 1 bit
DRAM, the chip count will be 8 data chips(8= 32/4) plus 4
parity chips(4=4/1), total is 12 chips.

4. For 64 bit DIMM using 1M by 16 bit SDRAM, the chip count
is 64/16=4 chips.

Hardware Installation

There is an important parameter affects SDRAM performance, CAS Latency
Time. It is similar as CAS Access Time of EDO DRAM and is calculated as
number of clock state. The SDRAM that AOpen had tested are listed below. If
your SDRAM has unstable problem, go into BIOS "Chipset Features Setup",
change CAS Latency Time to 3 clocks.

Manufacturer Model Suggested CAS

Latency Time

Samsung KM416511220AT-G12 2 Yes
NEC D4S16162G5-A12-7JF 2 No
Hitachi HM5216805TT10 2 No
Fujitsu 81117822A-100FN 2 No
TI TMX626812DGE-12 2 Yes
TI TMS626812DGE-15 3 Yes
TI TMS626162DGE-15 3 Yes
TI TMS626162DGE-M67 3 Yes

5V Tolerance

Following table list the recommended DRAM combinations of SIMM and DIMM:

SIMM
Data chip

1M by 4 None 1Mx32 x1 8 4MB Yes
1M by 4 None 1Mx32 x2 16 8MB Yes
1M by 4 1M by 1 1Mx36 x1 12 4MB Yes
1M by 4 1M by 4 1Mx36 x1 9 4MB Yes
1M by 4 1M by 4 1Mx36 x2 18 8MB Yes
1M by 16 None 1Mx32 x1 2 4MB Yes
1M by 16 None 1Mx32 x2 4 8MB Yes
1M by 16 1M by 4 1Mx36 x1 3 4MB Yes
1M by 16 1M by 4 1Mx36 x2 6 8MB Yes
4M by 4 None 4Mx32 x1 8 16MB Yes
4M by 4 None 4Mx32 x2 16 32MB Yes
4M by 4 4M by 1 4Mx36 x1 12 16MB Yes
4M by 4 4M by 1 4Mx36 x2 24 32MB Yes

SIMM
Parity chip

Bit size
per side

Single/
Double
side

Chip
count

SIMM
size

Recommended

2-27

Hardware Installation

SIMM
Data chip

16M by 4 None 16Mx32 x1 8 64MB Yes, but not

16M by 4 None 16Mx32 x2 16 128MB Yes, but not

16M by 4 16M by 4 16Mx36 x1 9 64MB Yes, but not

16M by 4 16M by 4 16Mx36 x2 18 128MB Yes, but not

DIMM
Data chip

1M by 16 1Mx64 x1 4 8MB Yes
1M by 16 1Mx64 x2 8 16MB Yes
2M by 8 2Mx64 x1 8 16MB Yes
2M by 8 2Mx64 x2 16 32MB Yes
4M by 16 4Mx64 x2 8 64MB Yes

DIMM
Data chip

2M by 32 2Mx64 x1 2 16MB Yes, but not tested.
2M by 32 2Mx64 x2 4 32MB Yes, but not tested.
4M by 16 4Mx64 x1 4 32MB Yes, but not tested.
8M by 8 8Mx64 x1 8 64MB Yes, but not tested.
8M by 8 8Mx64 x2 16 128MB Yes, but not tested.

SIMM
Parity chip

Bit size per
side

Bit size per
side

Bit size
per side

Single/
Double side

Single/
Double side

Single/
Double
side

Chip
count

Chip
count

Chip
count

SIMM
size

DIMM size Recommended

DIMM size Recommended

Recommended

tested.

tested.

tested.

tested.

2-28

Warning: 64MB SIMMs using 16M by 4 bit chip (64M bit

technology) are not available in the market and are not
formally tested by AOpen quality test department yet.
However they are supported by design specification from
Intel and they will be tested as soon as they are
available. Note that 64MB SIMMs using 16M by 1 bit
chip (16M bit technology) have chip count exceed 24 and
are strongly not recommended.

Hardware Installation

Tip: 8 bit = 1 byte, 32 bit = 4 byte. The SIMM size is
represented by number of data byte (whether with or
without parity), for example, the size of single side SIMM
using 1M by 4 bit chip is 1Mx32 bit, that is, 1M x 4 byte=
4MB. For double side SIMM, simply multiply it by 2, that
is, 8MB.

Following table are possible DRAM combinations that is NOT recommended:

SIMM
Data chip

1M by 1 None 1Mx32 x1 32 4MB No
1M by 1 1M by 1 1Mx36 x1 36 4MB No
1M by 4 1M by 1 1Mx36 x2 24 8MB No
4M by 1 None 4Mx32 x1 32 16MB No
4M by 1 4M by 1 4Mx36 x1 36 16MB No
16M by 1 None 16Mx32 x1 32 64MB No
16M by 1 16M by 1 16Mx36 x1 36 64MB No

DIMM
Data chip

4M by 4 4Mx64 x1 16 32MB No
4M by 4 4Mx64 x2 32 64MB No
16M by 4 16Mx64 x1 16 128MB No
16M by 4 16Mx64 x2 32 256MB No

SIMM
Parity chip

Bit size per
side

Bit size
per side

Single/
Double side

Single/
Double
side

Chip
count

Chip
count

SIMM
size

DIMM size Recommended

Recommended

2-29

Chapter 3

Award BIOS

This chapter tells you how to configure the system parameters. You may
update your BIOS via AWARD Flash Utility.

Important: Because the BIOS code is the most
often changed part of the mainboard design, the
BIOS information contained in this chapter
(especially the Chipset Setup parameters) may be
a little different compared to the actual BIOS that
came with your mainboard. These changes are
implemented to further enhance system
performance.

3-1

AWARD BIOS

3.1 Entering the Award BIOS Setup Menu

The BIOS setup utility is a segment of codes/routines residing in the BIOS
Flash ROM. This routine allows you to configure the system parameters and
save the configuration into the 128 byte CMOS area, (normally in the RTC chip

or directly in the main chipset). To enter the BIOS Setup, press during
POST (Power-On Self Test). The BIOS Setup Main Menu appears as follows.

Tip: Choose "Load Setup Defaults" for
recommended optimal performance. Choose
"Load Turbo Defaults" for best performance
with light system loading.

The section at the bottom of the screen tells how to control the screen. Use the
arrow keys to move between items, to color scheme of the display,

to exit, and to save the changes before exit. Another section at the

bottom of the screen displays a brief description of the highlighted item.
After selecting an item, press to select or enter a submenu.

3-2

AWARD BIOS

3.2 Standard CMOS Setup

The "Standard CMOS Setup" sets the basic system parameters such as the
date, time, and the hard disk type. Use the arrow keys to highlight an item and

or to select the value for each item.

Standard CMOS à Date

To set the date, highlight the Date parameter. Press or to set the
current date. The date format is month, date, and year.

Standard CMOS à Time

To set the time, highlight the Time parameter. Press or to set the
current time in hour, minute, and second format. The time is based on the 24
hour military clock.

3-3

AWARD BIOS

Standard CMOS à Primary Master à Type
Standard CMOS à Primary Slave à Type
Standard CMOS à Secondary Master à Type
Standard CMOS à Secondary Slave à Type

Type

Auto
User
None
1
2
...
45

This item lets you select the IDE hard disk parameters
that your system supports. These parameters are Size,
Number of Cylinder, Number of Head, Start Cylinder for
Pre-compensation, Cylinder number of Head Landing
Zone and Number of Sector per Track. The default
setting is Auto, which enables BIOS to automatically
detect the parameters of installed HDD at POST (Power­On Self Test). If you prefer to enter HDD parameters
manually, select User. Select None if no HDD is
connected to the system.

The IDE CDROM is always automatically detected.

Tip: For an IDE hard disk, we recommend that
you use the "IDE HDD Auto Detection" to enter
the drive specifications automatically. See the
section "IDE HDD Auto Detection".

Standard CMOS à Primary Master à Mode
Standard CMOS à Primary Slave à Mode
Standard CMOS à Secondary Master à Mode
Standard CMOS à Secondary Slave à Mode

Mode

Auto
Normal
LBA
Large

The enhanced IDE feature allows the system to use a
hard disk with a capacity of more than 528MB. This is
made possible through the Logical Block Address (LBA)
mode translation. The LBA is now considered as a
standard feature of current IDE hard disk on the market
because of its capability to support capacity larger than
528MB. Note that if HDD is formatted with LBA On, it
will not be able to boot with LBA Off.

Standard CMOS à Drive A
Standard CMOS à Drive B

Drive A

3-4

These items select floppy drive type. The available settings

AWARD BIOS

None
360KB 5.25"

1.2MB 5.25"
720KB 3.5"

1.44MB 3.5"

2.88MB 3.5"

and types supported by the mainboard are listed on the left.

Standard CMOS à Video

Video

EGA/VGA
CGA40
CGA80
Mono

This item specifies the type of video card in use. The
default setting is VGA/EGA. Since current PCs use VGA
only, this function is almost useless and may be
disregarded in the future.

Standard CMOS à Halt On

Halt On

No Errors
All Errors
All, But Keyboard
All, But Diskette
All, But Disk/Key

This parameter enables you to control the system stops in
case of Power-On Self Test (POST) error.

3-5

AWARD BIOS

3.3 BIOS Features Setup

This screen appears when you select the option "BIOS Features Setup" from
the main menu.

BIOS Features à Virus Warning

Virus Warning

Enabled
Disabled

Type "Y" to accept write, or "N" to abort write

3-6

Set this parameter to Enabled to activate the warning
message. This feature protects the boot sector and partition
table of your hard disk from virus intrusion. Any attempt during
boot up to write to the boot sector of the hard disk drive stops
the system and the following warning message appears on the
screen. Run an anti-virus program to locate the problem.

! WARNING !

Disk Boot Sector is to be modified

Award Software, Inc.

BIOS Features à External Cache

AWARD BIOS

External Cache

Enabled
Disabled

Enabling this parameter activates the secondary cache
(currently, PBSRAM cache). Disabling the parameter
slows down the system. Therefore, we recommend that
you leave it enabled unless you are troubleshooting a
problem.

BIOS Features à Quick Power On Self Test

Quick Power on
Self test

Enable
Disabled

This parameter speeds up POST by skipping some items
that are normally checked.

BIOS Features à Boot Sequence

Boot Sequence

A,C,SCSI
C,A,SCSI
C,CDROM,A
CDROM,C,A
D,A,SCSI
E,A,SCSI
F,A,SCSI
SCSI,A,C
SCSI,C,A
C only
LS/ZIP,C

This parameter allows you to specify the system boot up
search sequence. The hard disk ID are listed below:

C: Primary master
D: Primary slave
E: Secondary master
F: Secondary slave
LS: LS120 drive
ZIP: IOMEGA ZIP drive

BIOS Features à Swap Floppy Drive

Swap Floppy Drive

Enabled
Disabled

This item allows you to swap floppy drives. For example,
if you have two floppy drives (A and B), you can assign the
first drive as drive B and the second drive as drive A or
vice-versa.

3-7

AWARD BIOS

BIOS Features à Boot Up NumLock Status

Boot Up NumLock
Status

On
Off

Setting this parameter to On enables the numeric function
of the numeric keypad. Set this parameter to Off to
disregard the function. Disabling the numeric function
allows you to use the numeric keypad for cursor control.

BIOS Features à Boot Up System Speed

Boot Up System
Speed

High
Low

Select High or Low system speed after boot.

BIOS Features à Typematic Rate Setting

Typematic Rate
Setting

Enabled
Disabled

Set this parameter to Enable/Disable the keyboard
repeat function. When enabled, continually holding
down a key on the keyboard will generate repeatedly
keystrokes.

BIOS Features à Typematic Rate (Chars/Sec)

Typematic Rate

6
8
10
12
15
20
24
30

This item allows you to control the speed of repeated
keystrokes. The default is 30 characters/sec.

BIOS Features à Typematic Delay (Msec)

Typematic Delay

250
500
750
1000

3-8

This parameter allows you to control the delay time
between the first and the second keystroke (where the
repeated keystrokes begin). The typematic delay
settings are 250, 500, 750, and 1000 msec.

BIOS Features à Security Option

AWARD BIOS

Security Option

Setup
System

The System option limits access to both the System boot
and BIOS setup. A prompt asking you to enter your
password appears on the screen every time you boot the
system.

The Setup option limits access only to BIOS setup.
To disable the security option, select Password Setting

from the main menu, don't type anything and just press
<Enter>.

BIOS Features à PCI/VGA Palette Snoop

PCI/VGA Palette
Snoop

Enabled
Disabled

Enabling this item informs the PCI VGA card to keep silent
(and to prevent conflict) when palette register is updated
(i.e., accepts data without responding any communication
signals). This is useful only when two display cards use the
same palette address and plugged in the PCI bus at the
same time (such as MPEQ or Video capture). In such
case, PCI VGA is silent while MPEQ/Video capture is set
to function normally.

BIOS Features à OS Select for DRAM > 64MB

OS Select for
DRAM > 64MB

OS/2
Non-OS/2

Set to OS/2 if your system is utilizing an OS/2 operating
system and has a memory size of more than 64 MB.

BIOS Features à Video BIOS Shadow

Video BIOS
Shadow

Enabled
Disabled

VGA BIOS Shadowing means to copy video display
card BIOS into the DRAM area. This enhances system
performance because DRAM access time is faster than
ROM.

3-9

AWARD BIOS

BIOS Features à C800-CBFF Shadow
BIOS Features à CC00-CFFF Shadow
BIOS Features à D000-D3FF Shadow
BIOS Features à D400-D7FF Shadow
BIOS Features à D800-DBFF Shadow
BIOS Features à DC00-DFFF Shadow

C8000-CBFFF
Shadow

Enabled
Disabled

These six items are for shadowing ROM code on other
expansion cards. Before you set these parameters, you
need to know the specific addresses of that ROM code.
If you do not know this information, enable all the ROM
shadow settings.

Note: The F000 and E000 segments are
always shadowed because BIOS code
occupies these areas.

3-10

AWARD BIOS

3.4 Chipset Features Setup

The "Chipset Features Setup" includes settings for the chipset dependent
features. These features are related to system performance.

Caution: Make sure you fully understand the
items contained in this menu before you try to
change anything. You may change the
parameter settings to improve system
performance . However, it may cause system
unstable if the setting are not correct for your
system configuration.

Chipset Features à Auto Configuration

Auto Configuration

Enabled
Disabled

When Enabled, the DRAM and cache related timing
are set to pre-defined value according to CPU type
and clock. Select Disable if you want to specify your
own DRAM timing.

3-11

AWARD BIOS

Chipset Features à Refresh Cycle Time (us)

Refresh Cycle Time
(us)

15.6

62.4

124.8

187.2

This option lets you set the cycle time for the chipset
to refresh DRAM to avoid losing data. The unit is
micro second (us).

Chipset Features à RAS Pulse Width Refresh

RAS Pulse Width
Refresh

4T
5T
6T
7T

This parameter specifies the number of clocks
required to assert the DRAM row address strobe
(RAS) signal for refresh cycles.

Chipset Features à RAS Precharge Time

RAS Precharge Time

2T
3T
4T
5T

This parameter specifies the number of clocks
required to deassert the RAS signal to prevent DRAM
from losing data after performing a read. This
operation is called Precharge.

Chipset Features à RAS to CAS Delay

RAS to CAS Delay

2T
3T
4T
5T

3-12

This option allows you to set the wait state between
row address strobe (RAS) and column address strobe
(CAS) signals.

Chipset Features à ISA Bus Clock Frequency

AWARD BIOS

ISA Bus Clock
Frequency

7.159MHz
PCICLK/4
PCICLK/3

This item lets you select the ISA bus clock. Normally,
the PCI bus clock is the CPU bus (external) clock
divided by 2, PCICLK=CPUCLK/2. For example,
CPUCLK=66MHz, PCICLK=66/2=33MHz, ISA bus
CLK=33/4=8.25MHz.

Chipset Features à SDRAM CAS Latency

SDRAM CAS
Latency

2T
3T

This parameter speifies the number of clocks of
SDRAM CAS Lateny. This is very important
parameter affects SDRAM performance. If your
SDRAM has unstable problem, set to 3T.

Chipset Features à System BIOS Cacheable

System BIOS
Cacheable

Enabled
Disabled

Enabling this item allows you to cache the system
BIOS to further enhance system performance.

Chipset Features à Video BIOS Cacheable

Video BIOS
Cacheable

Enabled
Disabled

Allows the video BIOS to be cached to allow faster
video performance.

3-13

AWARD BIOS

Chipset Features à Memory Hole At 15M-16M

Memory Hole At
15M-16M

Enabled
Disabled

This option lets you reserve system memory area for
special ISA cards. The chipset accesses code/data
of these areas from the ISA bus directly. Normally,
these areas are reserved for memory mapped I/O
card.

3-14

AWARD BIOS

3.5 Power Management Setup

The Power Management Setup screen enables you to control the mainboard
green features. See the following screen.

Power Management à Power Management

Power Management

Max Saving
Mix Saving
User Defined
Disabled

Mode Doze Standby Suspend

Min Saving 40 min 40 min 40 min
Max Saving 20 sec 20 sec 20 sec

This function allows you to set the default parameters
of power-saving modes. Set to Disable to turn off
power management function. Set to User Defined to
choose your own parameters.

3-15

AWARD BIOS

Power Management à PM Controlled by APM

PM Controlled by
APM

Yes
No

If "Max Saving" is selected, you can turn on this item,
transfer power management control to APM
(Advanced Power Management) and enhance power
saving function. For example, stop CPU internal
clock.

Power Management à Video Off Option

Video Off Option

Always On
All Modes à Off
Suspend à Off
Susp, Standby à Off

To turn off video monitor at which power down mode.

Power Management à Break Switch

Break Switch

Enabled
Disabled

Setting this item to Enabled allows you to use the
Turbo switch as Suspend switch. Pressing the Turbo
switch changes nothings for a Pentium system, so we
usually use this switch to act as a Suspend switch.
The default value of this item is Disabled.

Power Management à HDD Off After

HDD Off After

Disabled
1 Min
2 Min

.....

15 Min

This option lets you specify the IDE HDD idle time
before the device enters the power down state. This
item is independent from the power states described
in this section (Standby and Suspend).

3-16

Power Management à Doze Speed (div by)
Power Management à Stdby Speed (div by)

AWARD BIOS

Doze Speed (div by)

1
2
3
4
5
6
7
8

These items let you set the system speed divisor to
specify the rate at which the system speed will slow
down once it enters the Doze Mode or Standby
Mode. The options are from 1 to 8. To determine the
exact rate of the system in Doze mode, take 2 as the
divisor and 133MHz as the normal system speed.
133MHz/2 = 66MHz - this is the system speed in
Doze mode.

Power Management à Suspend Mode Option

Suspend Mode
Option

Power On Suspend
Suspend to Hard Drive

You can select suspend mode by this item. Power
On Suspend is the traditional Green PC suspend

mode, the CPU clock is stop, all other devices are
shut off. But power must be kept On to detect
activities from modem, keyboard/mouse and returns
the system to full power. The system activities is
detected by monitoring the IRQ signals. Suspend to
Hard Drive saves system status, memory and screen
image into hard disk, then the power can be totally
Off. Next time, when power is turned On, the system
goes back to your original work within just few
seconds. You need utility ZVHDD to reserve disk
space. Refer to section "Suspend to Hard Drive" for
more information".

3-17

AWARD BIOS

Power Management à HDD Ports Activity
Power Management à COM Ports Activity
Power Management à LPT Ports Activity
Power Management à VGA Activity

COM Ports Activity

Enabled
Disabled

To enable or disable the detection of COM port, LPT,
HDD, VGA activities for power down state transition.

Power Management à IRQ [3-7,9-15], NMI

IRQ [3-7,9-15], NMI

Enabled
Disabled

To enable or disable the detection of IRQ3-7, IRQ9­15 or NMI interrupt events for power down state
transition.

Power Management à IRQ 8 Break Suspend

IRQ 8 Break Suspend

Enabled
Disabled

To enable or disable the detection of IRQ8 (RTC)
event for power down state transition. OS2 has
periodically IRQ8 (RTC) interruptions, If IRQ8 is not
set to Disabled, OS/2 may fail to go into
Doze/Standby/Suspend mode.

3-18

AWARD BIOS

3.6 PNP/PCI Configuration Setup

The PNP/PCI Configuration Setup allows you to configure the ISA and PCI
devices installed in your system. The following screen appears if you select the
option "PNP/PCI Configuration Setup" from the main menu.

PNP/PCI Configuration à PnP OS Installed

PnP OS Installed

Yes
No

Normally, the PnP resources are allocated by BIOS
during POST (Power-On Self Test). If you are using
a PnP operating system (such as Windows 95), set
this item to Yes to inform BIOS to configure only the
resources needed for booting (VGA/IDE or SCSI).
The rest of system resources will be allocated by PnP
operating system.

3-19

AWARD BIOS

PNP/PCI Configuration à Resources Controlled By

Resources Controlled
by

Auto
Manual

Setting this option to Manual allows you to individually
assign the IRQs and DMAs to the ISA and PCI
devices. Set this to Auto to enable the auto­configuration function.

PNP/PCI Configuration à Reset Configuration Data

Reset Configuration
Data

Enabled
Disabled

In case conflict occurs after you assign the IRQs or
after you configure your system, you can enable this
function, allow your system to automatically reset your
configuration and reassign the IRQs.

PNP/PCI Configuration à IRQ3 (COM2) assigned to
PNP/PCI Configuration à IRQ4 (COM1) assigned to
PNP/PCI Configuration à IRQ5 (Network/Sound) assigned to
PNP/PCI Configuration à IRQ7 (Printer or Others) assigned to
PNP/PCI Configuration à IRQ9 (Video or Others) assigned to
PNP/PCI Configuration à IRQ10 (SCSI or Others) assigned to
PNP/PCI Configuration à IRQ11 (SCSI or Others) assigned to
PNP/PCI Configuration à IRQ12 (PS/2 Mouse) assigned to
PNP/PCI Configuration à IRQ14 (IDE1) assigned to
PNP/PCI Configuration à IRQ15 (IDE2) assigned to

IRQ 3 assigned to

Legacy ISA
PCI/ISA PnP

If your ISA card is not PnP compatible and requires a
special IRQ to support its function, set the selected
IRQ to Legacy ISA. This setting informs the PnP
BIOS to reserve the selected IRQ for the installed
legacy ISA card. The default is PCI/ISA PnP. Take
note that PCI cards are always PnP compatible
(except old PCI IDE card).

3-20

PNP/PCI Configuration à DMA 0 assigned to
PNP/PCI Configuration à DMA 1 assigned to
PNP/PCI Configuration à DMA 3 assigned to
PNP/PCI Configuration à DMA 5 assigned to
PNP/PCI Configuration à DMA 6 assigned to
PNP/PCI Configuration à DMA 7 assigned to

AWARD BIOS

DMA 0 assigned
to

Legacy ISA
PCI/ISA PnP

If your ISA card is not PnP compatible and requires a
special DMA channel to support its function, set the
selected DMA channel to Legacy ISA. This setting informs
the PnP BIOS to reserve the selected DMA channel for the
installed legacy ISA card. The default is PCI/ISA PnP.
Take note that PCI card does not require DMA channel.

PNP/PCI Configuration à PCI IDE IRQ Map To

PCI IDE IRQ Map
To

ISA
PCI-Slot1
PCI-Slot2
PCI-Slot3
PCI-Slot4
PCI-Auto

Some old PCI IDE add-on cards are not fully PnP
compatible. These cards require you to specify the
slot in use to enable BIOS to properly configure the
PnP resources. This function allows you to select the
PCI slot for any PCI IDE add-on card present in your
system. Set this item to Auto to allow BIOS to

automatically configure the installed PCI IDE card(s).

PNP/PCI Configuration à Primary IDE INT#
PNP/PCI Configuration à Secondary IDE INT#

Primary IDE INT#

A
B
C
D

These two items, in conjunction with item "PCI IDE
IRQ Map To", specify the IRQ routing of the primary
or secondary channel of the PCI IDE add-on card (not
the onboard IDE). Each PCI slot has four PCI
interrupts aligned as listed in the table below. You
must specify the slot in the "PCI IDE IRQ Map To",
and set the PCI interrupt (INTx) here according to the
interrupt connection on the card.

PCI Slot Location 1 Location 2 Location 3 Location 4

3-21

AWARD BIOS

(pin A6) (pin B7) (pin A7) (pin B8)

Slot 1 INTA INTB INTC INTD
Slot 2 INTB INTC INTD INTA
Slot 3 INTC INTD INTA INTB
Slot 4 INTD INTA INTB INTC
Slot 5 (if any) INTD INTA INTB INTC

PNP/PCI Configuration à Slot1 IRQ No. (Right)
PNP/PCI Configuration à Slot2 IRQ No.
PNP/PCI Configuration à Slot3 IRQ No. (Left)

Slot1 IRQ No.

3
4
5
7
9
10
11
12
14
15
Auto

This item is reserved for engineering purpose to let
you assign an IRQ manually to the add-on card on
each PCI slot. If you select Auto, system will
automatically assign an available value to the device.

It is suggested to use default setting, which is Auto, in
order to comply with PnP specification completely.

3-22

AWARD BIOS

3.7 Load Setup Defaults

The "Load Setup Defaults" option loads optimized settings for optimum system
performance. Optimal settings are relatively safer than the Turbo settings. We
recommend you to use the Optimal settings if your system has large memory
size and fully loaded with add-on card.

Optimal is not the slowest setting for this mainboard. If you need to verify a
unstable problem, you may manually set the parameter in the "BIOS Features
Setup" and "Chipset Features Setup" to get slowest and safer setting.

3.8 Load Turbo Defaults

The "Load Turbo Defaults" option gives better performance than Optimal
values. However, Turbo values may not be the best setting of this mainboard
but these values are qualified by the AOpen RD and QA department as the
reliable settings especially if you have limited loading of add-on card and
memory size (for example, a system that contains only a VGA/Sound card and
two SIMMs).

To attain the best system performance, you may manually set the parameters
in the "Chipset Features Setup" to get proprietary setting. Make sure that you
know and understand the functions of every item in Chipset Setup menu. The
performance difference of Turbo from Optimal is normally around 3% to 10%,
depending on the chipset and the application.

3-23

AWARD BIOS

3.9 Integrated Peripherals

The following screen appears if you select the option "Integrated Peripherals"
from the main menu. This option allows you to configure the I/O features.

Integrated Peripherals à Internal PCI/IDE

Internal PCI IDE

Disabled
Primary
Secondary
Both

3-24

This parameter lets you enable or disable the on-chip
primary or secondary IDE device.

AWARD BIOS

Integrated Peripherals à IDE Primary Master PIO
Integrated Peripherals à IDE Primary Slave PIO
Integrated Peripherals à IDE Secondary Master PIO
Integrated Peripherals à IDE Secondary Slave PIO

IDE Primary Master
PIO

Auto
Mode 0
Mode 1
Mode 2
Mode 3
Mode 4

Setting this item to Auto activates the HDD speed
auto-detect function. The PIO mode specifies the
data transfer rate of HDD. For example: mode 0
data transfer rate is 3.3MB/s, mode 1 is 5.2MB/s,
mode 2 is 8.3MB/s, mode 3 is 11.1MB/s and mode 4
is 16.6MB/s. If your hard disk performance becomes
unstable, you may manually try the slower mode.

Caution: It is recommended that you
connect the first IDE device of each
channel to the endmost connector of the
IDE cable. Refer to section 2.3
"Connectors" for details on how to connect
IDE device(s).

Integrated Peripherals à Primary Master UltraDMA
Integrated Peripherals à Primary Slave UltraDMA
Integrated Peripherals à Secondary Master UltraDMA
Integrated Peripherals à Secondary Slave UltraDMA

Primary Master
UltraDMA

Auto
Disabled

This item allows you to set the Ultra DMA/33 mode
supported by the hard disk drive connected to your
primary IDE connector.

Integrated Peripherals à IDE HDD Block Mode

IDE HDD Block
Mode

Enabled
Disabled

This feature enhances disk performance by allowing
multisector data transfers and eliminates the interrupt
handling time for each sector. Most IDE drives,
except with old designs, can support this feature.

3-25

AWARD BIOS

Integrated Peripherals à USB Controller

USB Controller

Enabled
Disabled

USB device is default to use PCI INTD#, the same as
PCI slot4. If you installed PCI card on slot4 and
require to use INTD#, set this item to Disabled. The
USB device will then be disabled.

Note:Normally, PCI VGA does not need PCI
interrupt, you may put PCI VGA on slot4.

Integrated Peripherals à USB Keyboard Support

USB Legacy Support

Enabled
Disabled

This item lets you enable or disable the USB
keyboard driver within the onboard BIOS. The
keyboard driver simulates legacy keyboard command
and let you use USB keyboard during POST or after
boot if you don't have USB driver in the operating
system.

Caution: You can not use both USB driver
and USB legacy keyboard at the same time.
Disable "USB Legacy Support" if you have
USB driver in the operating system.

Integrated Peripherals à Onboard FDC Controller

Onboard FDC
Controller

Enabled
Disabled

Setting this parameter to Enabled allows you to
connect your floppy disk drives to the onboard floppy
disk connector instead of a separate controller card.
Change the setting to Disabled if you want to use a
separate controller card.

3-26

Integrated Peripherals à Onboard Serial 1
Integrated Peripherals à Onboard Serial 2

AWARD BIOS

Onboard Serial 1

Auto
3F8/IRQ4
2F8/IRQ3
3E8/IRQ4
2E8/IRQ3
Disabled

This item allow you to assign address and interrupt for
the board serial port. Default is Auto.

Note: If you are using an network card, make
sure that the interrupt does not conflict.

Integrated Peripherals à Onboard UART 2 Mode

Onboard UART 2
Mode

Standard
HPSIR
ASKIR

This item is configurable only if the "Onboard UART
2" is enabled. This allows you to specify the mode
of serial port2. The available mode selections are:

• Standard - Sets serial port 2 to operate in normal mode. This is the

default setting.

• HPSIR - Select this setting if you installed an Infrared module in your

system via IrDA connector (refer to section 2.3 "Connectors"). This
setting allows infrared serial communication at a maximum baud rate of
115K baud.

• ASKIR - Select this setting if you installed an Infrared module via IrDA

connector (refer to section 2.3 "Connectors"). This setting allows infrared
serial communication at a maximum baud rate of 19.2K baud.

3-27

AWARD BIOS

Integrated Peripherals à Onboard Parallel Port

Onboard Parallel
Port

3BC/IRQ7
378/IRQ7
278/IRQ7
Disabled

This item controls the onboard parallel port address
and interrupt.

Note: If you are using an I/O card with a
parallel port, make sure that the addresses
and IRQ do not conflict.

Integrated Peripherals à Parallel Port Mode

Parallel Port Mode

Normal
EPP
ECP
ECP + EPP

This item lets you set the parallel port mode. The
mode options are Normal (Standard and Bidirection
Parallel Port), EPP (Enhanced Parallel Port) and ECP
(Extended Parallel Port). Normal is the IBM AT and
PS/2 compatible mode. EPP enhances the parallel
port throughput by directly writing/reading data to/from
parallel port without latch. ECP supports DMA and
RLE (Run Length Encoded) compression and
decompression.

Integrated Peripherals à ECP Mode Use DMA

ECP Mode Use DMA

3
1

3-28

This item lets you set the DMA channel of ECP mode.

AWARD BIOS

3.10 Password Setting

Password prevents unauthorized use of your computer. If you set a password,
the system prompts for the correct password before boot or access to Setup.

To set a password:

1. At the prompt, type your password. Your password can be up to 8
alphanumeric characters. When you type the characters, they appear as
asterisks on the password screen box.

2. After typing the password, press.

3. At the next prompt, re-type your password and press again to confirm the
new password. After the password entry, the screen automatically reverts
to the main screen.

To disable the password, press when prompted to enter the password. The
screen displays a message confirming that the password has been disabled.

3.11 IDE HDD Auto Detection

If your system has an IDE hard drive, you can use this function to detect its
parameters and enter them into the "Standard CMOS Setup" automatically.

This routine only detects one set of parameters for your IDE hard drive. Some
IDE drives can use more than one set of parameters. If your hard disk is
formatted using different parameters than those detected, you have to enter the
parameters manually. If the parameters listed do not match the ones used to
format the disk, the information on that disk will not be accessible. If the auto­detected parameters displayed do not match those that used for your drive,
ignore them. Type N to reject the values and enter the correct ones manually

from the Standard CMOS Setup screen.

3.12 Save & Exit Setup

This function automatically saves all CMOS values before leaving Setup.

3-29

AWARD BIOS

3.13 Exit without Saving

Use this function to exit Setup without saving the CMOS value changes. Do
not use this option if you want to save the new configuration.

3.14 NCR SCSI BIOS and Drivers

The NCR 53C810 SCSI BIOS resides in the same flash memory chip as the
system BIOS. The onboard NCR SCSI BIOS is used to support NCR 53C810
SCSI control card without BIOS code. The NCR SCSI BIOS directly supports
DOS, Windows 3.1 and OS/2. For better system performance, you may use
the drivers that come with the NCR SCSI card or with your operating system.
For details, refer to the installation manual of your NCR 53C810 SCSI card.

3.15 BIOS Flash Utility

The BIOS Flash utility allows you to upgrade the system BIOS. To get the
AOpen Flash utility and the upgrade BIOS file, contact your local distributor or
visit our homepage at http://www.aopen.com.tw. Please make sure that you
have the correct BIOS ready, the BIOS filename is normally like
AP58R110.BIN, which means model AP58 BIOS revision 1.10.

There are two useful programs, Checksum utility CHECKSUM.EXE and AOpen
Flash utility AOFLASH.EXE. Follow the procedures below to upgrade your
BIOS.

[CHECKSUM.EXE]
This utility will help you to determine if the BIOS has been downloaded correctly

or not.

1. Execute

C:> CHECKSUM Biosfile.bin
Biosfile.bin is the filename of the BIOS code. (for example, AP58R110.BIN)

2. The utility will show "Checksum is ssss".

3-30

AWARD BIOS

3. Compare the "ssss" with original checksum posted on Web or BBS. If they

are different, please do not proceed any further and try to download the
BIOS again.

[AOFLASH.EXE]
This utility will try to check the mainboard model, BIOS version and Super/Ultra

IO chip model. To ensure the correct BIOS file for the correct mainboard and
IO chip. This utility will permanently replace your original BIOS content after
flashing.

1. Bootup DOS from floppy without loading any memory manager (HIMEM,

EMM386, QEMM386, ...).

2. Execute

C:> AOFLASH Biosfile.bin
Biosfile.bin is the filename of the BIOS code. (for example, AP58R110.BIN)

3. After loading the new BIOS code, the utility will prompt you to save original

BIOS code into your HDD or floppy. Please press "Y" to store it as
"BIOS.OLD".

4. After the old BIOS has been successfully saved, press "Y" to replace BIOS.

5. DO NOT turn off the power during "FLASHING".

6. Reboot the system by turn off the power after "FLASHING".

7. Press "DEL" key to enter BIOS setup during POST.

8. Reload the "BIOS SETUP DEFAULT" and reconfigure other items as

previous set.

9. Save & Exit. Done!

Warning: DO NOT turn off the power during
"FLASHING". If the BIOS programming is not
successfully finished, the system will not be boot
again, and you may need to physically replace the
BIOS chip.

Tip: You may load back original BIOS "BIOS.OLD" by
the same procedure.

3-31

Appendix A

BIOS revision

Frequently Asked Question

Note: FAQ may be updated without notice. If you
cannot find the information that you need in this
appendix, visit our WWW home page
(http://www.aopen.com.tw) and check the FAQ
area and other new information.

Q: How can I identify the mainboard BIOS version?

A: The AOpen mainboard BIOS version appears on the upper-left corner of

the POST (Power-On Self Test) screen. Normally, it starts with R and is
found in between the model name and the date. For example:

AP53/AX53 R3.80 Oct.22.1996

Q: Why the AOpen mainboards (MB) do not have cache module

expansion slot?

A: Faster CPU speed requires more difficult and complex MB timing design.

Every trace and components delay must be taken into consideration. The
expansion cache slot design will cause 2 or 3ns delay in PBSRAM timing,
and the extended trace length to the cache module through the golden
finger will further delay the timing by 1 or 2ns. This may result in unreliable
system once the cache module and slot becomes worn. All AOpen MBs
support 512KB PBSRAM onboard. For better performance (around 3%
higher than 256KB), we strongly recommend you to use 512KB onboard.
Otherwise, reliable 256KB is better than unreliable 512KB with cache
module. AOpen is the first company to promote this concept since the
fourth quarter of 1995.

A-1

Frequently Asked Questions

Q: What is MMX?

A: MMX is the new single-line multiple-instruction technology of the new Intel

Pentium PP/MT (P55C) and Pentium II (Klamath) CPU. The AMD K6 and
Cyrix M2 will support MMX, too. The MMX instructions are specifically
useful for multimedia applications (such as 3D video, 3D sound, video
conference). The performance can be improved if applications use these
instructions. All AOpen MBs have at least dual power onboard to support
MMX. It is not necessary to have special chipset for MMX CPU.

Q: Which version of the Windows '95 that I am using?

A: You may determine the version of Windows '95 by following steps.

1. Double click "System" in "Control Panel".

2. Click "General".

3. Look for "System" heading & refer to following,

4.00.950 Windows 95

4.00.950A Windows 95 + Service Pack or OEM Service Release 1

4.00.950B OEM Service Release 2 or OEM Service Release 2.1

4.00.950C OEM Service Release 2.5

If you are running OSR 2.1, you may tell it from by checking "USB
Supplement to OSR2" in the list of installed program of Add/Remove
program tool under Control Panel, and checking for version 4.03.1212 of
the Ntkern.vxd file in the Windows\System\Vmm32 folder.

Q: What is USB (Universal Serial Bus)?

A: USB is a new 4-pin serial peripheral bus that is capable of cascading

low/medium speed peripherals (less than 10Mbit/s) such as keyboard,
mouse, joystick, scanner, printer and modem/ISDN. With USB, the
traditional complex cables from back panel of your PC can be eliminated.

You need the USB driver to support USB device(s). AOpen MBs are all
USB ready, you may get latest BIOS from AOpen web site
(http://www.aopen.com.tw). Our latest BIOS includes the keyboard driver
(called Legacy mode), that simulates USB keyboard to act as AT or PS/2
keyboard and makes it possible to use USB keyboard if you don't have
driver in your OS. For other USB devices, you may get the drivers from
your device vendor or from OS (such as Win95). Be sure to turn off "USB
Legacy Support" in BIOS "Chipset Setup" if you have another driver in your
OS.

A-2

Frequently Asked Question

Q: How to install Windows 95 USB driver?

A: If you are Win'95 OSR 2.0 user (.950B, shows "PCI Universal Serial

Devices"), you may obtain USBSUPP.EXE from Microsoft or your OEM
system provider for installing Microsoft USB supplement which will create
"USB Supplement to OSR2" in the list of Add/Remove program tool under
Control Panel. After above installation, please run AOchip.exe provided by
AOpen to create USB Controller under Device Manager.

If you are Win'95 OSR 2.1 or 2.5 user, only AOchip.exe installation is
necessary.

If you are Win'95 retail user (.950 or .950A), there is no direct upgrade path
available from Microsoft at this moment. It is expected to be implemented
under Windows'98.

Q: What is P1394?

A: P1394 (IEEE 1394) is another standard of high-speed serial peripheral bus.

Unlike low or medium speed USB, P1394 supports 50 to 1000Mbit/s and
can be used for video camera, disk and LAN. Since P1394 is still under
development, , there is no P1394 device currently available in the PC
market. Also, there is no chipset that can support P1394. Probably in the
near future, a card will be developed to support P1394 device.

A-3

Frequently Asked Questions

Q: What is SMBus (System Management Bus, also called I2C bus)?

A: SMBus is a two-wire bus developed for component communication

(especially for semiconductor IC). It is most useful for notebook to detect
component status and replace hardware configuration pin (pull-high or pull­low). For example, disabling clock of DIMM that does not exist, or detecting
battery low condition. The data transfer rate of SMBus is only 100Kbit/s, it
allows one host to communicate with CPU and many masters and slaves to
send/receive message. The SMBus may be used for jumpless mainboard,
the components which support SMbus are not ready yet, we will keep eyes
on it.

Q: What is FCC DoC (Declaration of Conformity)?

A: The DoC is new certification standard of FCC regulations. This new

standard allows DIY component (such as mainboard) to apply DoC label
separately without a shielding of housing. The rule to test mainboard for
DoC is to remove housing and test it with regulation 47 CFR 15.31. The
DoC test of mainboard is more difficult than traditional FCC test. If the
mainboard passes DoC test, that means it has very low EMI radiation and
you can use any kind of housing (even paper housing). Following is an
example of DoC label.

AP5T

A-4

Test To Comply
With FCC Standards

FOR HOME OR OFFICE USE

Frequently Asked Question

Q: What is PBSRAM (Pipelined Burst SRAM)?

A: For Pentium CPU, the Burst means reading four QWord (Quad-word, 4x16

= 64 bits) continuously with only the first address decoded by SRAM. The
PBSRAM will automatically send the remaining three QWord to CPU
according to predefined sequence. The normal address decoding time for
SRAM is 2 to 3 clocks. This makes the CPU data read timing of four
QWord to be at least 3-2-2-2 and a total of 9 clocks if traditional
asynchronous SRAM is used. However, with PBSRAM, there is no need to
decode address for rest three Qword. Therefore, data read timing can be 3­1-1-1, that is equivalent to 6 clocks and is faster than asynchronous SRAM.

Q: What is EDO (Extended Data Output) memory?

A: The EDO DRAM technology of EDO is actually very similar to FPM (Fast

Page Mode). Unlike traditional FPM that tri-states the memory output data
to start the pre-charge activity, EDO DRAM holds the memory data valid
until the next memory access cycle, that is similar to pipeline effect and
reduces one clock state.

Q: What is SDRAM (Synchronous DRAM)?

A: The SDRAM is a new generation DRAM technology that allows DRAM to

use the same clock as the CPU host bus (EDO and FPM are asynchronous
and do not have clock signal). The idea is the same as "Burst" (refer to the
previous Q & A). It requires only one clock for the 2nd, 3rd, and 4th QWord
(for example, 5-1-1-1 compares with EDO 5-2-2-2). The SDRAM comes in
64-bit 168-pin DIMM (Dual-in-line Memory Module) and operates at 3.3V.
Note that some old DIMMs are made by FPM/EDO and only operate at 5V.
Do not confuse them with SDRAM DIMM. AOpen is the first company to
support dual-SDRAM DIMMs onboard (AP5V), from Q1 1996.

Q: Can SDRAM DIMM work together with FPM/EDO SIMM?

A: The FPM/EDO operate at 5V while SDRAM operates at 3.3V. The current

Motherboard design provides different power to DIMM and SIMM but
connects the data bus together. If you combine SIMM and DIMM, the
system will still work fine; however, only temporarily. After a few months,
the SDRAM 3.3V data input will be damaged by 5V FPM/EDO data output
line. Therefore, we strongly NOT recommend DIMM and SIMM combined
together. There is one exception, if your SDRAM supports 5V tolerance
(such as TI or Samsung), which accepts 5V signal at 3.3V operating power,
you can combine them.

Q: What is Bus Master IDE (DMA mode)?

A-5

Frequently Asked Questions

A: The traditional PIO (Programmable I/O) IDE requires the CPU to involve in

all the activities of the IDE access including waiting for the mechanical
events. To reduce the workload of the CPU, the bus master IDE device
transfers data from/to memory without interrupting CPU, and releases CPU
to operate concurrently while data is transferring between memory and IDE
device. You need the bus master IDE driver and the bus master IDE HDD
to support bus master IDE mode. Note that it is different with master/slave
mode of the IDE device connection. For more details, refer to section 2.3
"Connectors".

Q: What is the Ultra DMA/33?

A: This is the new specification to improve IDE HDD data transfer rate. Unlike

traditional PIO mode, which only uses the rising edge of IDE command
signal to transfer data, the DMA/33 uses both rising edge and falling edge.
Hence, the data transfer rate is double of the PIO mode 4 or DMA mode 2.
(16.6MB/s x2 = 33MB/s).

The following table lists the transfer rate of IDE PIO and DMA modes. The
IDE bus is 16-bit, which means every transfer is two bytes.

Mode Clock per

33MHz
PCI

PIO mode 0 30ns 20 600ns (1/600ns) x 2byte = 3.3MB/s
PIO mode 1 30ns 13 383ns (1/383ns) x 2byte = 5.2MB/s
PIO mode 2 30ns 8 240ns (1/240ns) x 2byte = 8.3MB/s
PIO mode 3 30ns 6 180ns (1/180ns) x 2byte = 11.1MB/s
PIO mode 4 30ns 4 120ns (1/120ns) x 2byte = 16.6MB/s

Mode Clock per

33MHz
PCI

DMA mode 0 30ns 16 480ns (1/480ns) x 2byte = 4.16MB/s
DMA mode 1 30ns 5 150ns (1/150ns) x 2byte = 13.3MB/s
DMA mode 2 30ns 4 120ns (1/120ns) x 2byte = 16.6MB/s
DMA/33 30ns 4 120ns (1/120ns) x 2byte x2 = 33MB/s

Q: What is PnP (Plug and Play)?

A-6

Clock
count

Clock
count

Cycle
time

Cycle
time

Data Transfer rate

Data Transfer rate

Frequently Asked Question

A: In the past, the IRQ/DMA and memory or I/O space of add-on cards are

normally set manually, i.e., by jumper or by proprietary utility. The user has
to check the user's guide for the correct setting. Sometimes, resource
conflict occurs and this leads to unstable system. The PnP specification
suggests a standard register interface for both BIOS and OS (such as
Win95). These registers are used by BIOS and OS to configure system
resource and prevent any conflicts. The IRQ/DMA/Memory will be
automatically allocated by PnP BIOS or OS.

Currently, almost all the PCI cards and most ISA cards are PnP compliant.
If you are still using a Legacy ISA card that cannot support PnP, set the
corresponding resource (IRQ/DMA/memory) to ISA in the BIOS "PCI/PnP
Setup".

Q: Power Management Icon does not appear in the Windows 95 Control

Panel even though the APM under BIOS Setup is enabled.

A: This problem occurs if you did not enable the APM function before you

install Windows 95. If you have already installed Windows 95, re-install it
after the BIOS APM function is enabled.

Q: Why does the system fail to go into suspend mode under Win95?

A: This problem may be caused by your CDROM settings. The CDROM Auto

Insert Notification of Win95 is dafault enabled, the system will continue to
monitor your CDROM, auto-execute application when a CD diskette is
loaded, and prevents the system from entering into suspend mode. To
resolve this, go into Control Panel è System è Device Manager è
CDROM è Setting, and disable the "Auto Insert Notification" function.

Q: What is Windows 95 Registry?

A: The functions of Windows 95 Registry and the Windows 3.1 INI files are

almost the same. Both store the hardware and software configurations.
The only difference is that Registry is a database while INI is text file. You
can run REGEDIT.EXE to further understand the Registry structure.
Checking and studying the structure of this file will help you solve some
configuration problems.

A-7

Frequently Asked Questions

Q: What is the benefit of using Resetable Fuse?

A: The traditional pico-fuse needs to be replaced once it is burned due to any

abnormal surge current. It has to be replaced by qualified repairing engineer
which is cost & time consuming. With the updated technology, AOpen
motherboard starts to introduce new "Resetable" fuse, which is

"PolySwitch", to protect your keyboard & USB circuit. When there is surge
current, this PolySwitch will reach high impedance within few m/seconds so

that the circuit becomes opened. PolySwitch will be recovered to its original
stage after surge current disappeared & the system is being cooled down
for a while.

It is highly recommended to adopt "Resetable" fuse in order to fully support
"Hot-Plug" feature on USB.

Q: How can I eliminate the "?" marks presented under Device Manager

after installing Win'95 on TX/LX/BX/5582/5591 based system?

A: Even though your system will work fine with this "?" marks, we received

many requests about how to eliminate it. AOpen software team spends few
weeks to develop an utility AOchip.exe for the convenience of Win95 users.
It is very user friendly and can be used on any TX/LX/BX/5582/5591 chipset
based motherboard, not limited to AOpen products. You are welcome to
distribute it, if you like it, simply say thanks to our software team. Note that
you need USB driver for USB devices to work properly which is expected to
be implemented on Windows'98.

A-8

Appendix B

Troubleshooting

In case you encounter any of the troubles listed below, follow the procedures
accordingly to resolve the problem. If the first corrective action listed did not
work, then try the next one.

Tip: There are many useful information in our homepage, such
as jumper settings, latest BIOS, drivers, and more FAQs. Visit
our homepage to see if there is answer of your problem.

Taiwan http://www.aopen.com.tw
USA http://www.aopen-usa.com
http://www.aopenusa.com
http://www.aopenamerica.com
Europe http://www.aopen.nl

Important: Make sure that you have tried listed procedures in

this appendix before you call your distributor. If the problem still
exist, fill out the attached Technical Problem Report Form.
Please write down your configuration and error symptoms as
detailed as possible. The more detailed information you give
us, the faster we can identify and solve your problem. You can
copy this form and fax it to your distributor or send the form via
e-mail. For getting better efficiency, we don't recommand you
report the problem through phone.

B-1

Troubleshooting

No display.

a. Check all jumper settings to make sure that you have set the proper

jumpers, especially those for CPU type, single/dual voltage (P54C/MMX),
CPU frequency and ratio.

b. Check the power cord or power switch of your system. The simple way to

identify power failure is to check the CPU fan and the power supply fan. If
these are not working, then the power is down.

c. Is there a short on the motherboard? (Is the fan of the power supply

working properly?)

d. Turn off the power and remove all add-on cards, IDE cables and floppy

cables from your mainboard. Only install the VGA card to simplify the
problem.

e. If you use a PCI VGA card, reinstall it to other PCI slot or try another card.
f. Check if the memory (SIMM/DIMM) were installed properly. Reinstall the

SIMM/DIMM to other socket or try another SIMM/DIMM.

g. Make sure the flat cable matches pin1 of IDE connector and your IDE

device.

There is display, but can 't enter BIOS Setup.

a. For checking if the keyboard works properly, press the <Num Lock> key

to enable/disable the Num Lock function, and check if the LED will ON
and OFF accordingly.

b. Check if Turbo Switch was released, don 't use Turbo Switch before

system boots. (In fact, there is no Turbo function after Pentium machine.
Now Turbo Switch usually acts as Suspend Switch.)

System sometimes auto reboots.

a. Clear CMOS. BIOS will load default setting, use the slowest and most

reliable setting.

b. Repeat the steps in "No display" section carefully.

B-2

Troubleshooting

There is display, but can 't boot.

a. Check BIOS Setup if the HDD is set to LBA (more than 540MB) format.
b. Load default setting.
c. Boot system from floppy drive. If pass, the problem should be caused by

the IDE cable or HDD itself.

HDD Controller Fail, can't detect HDD.

a. Make sure the Master/Slaver setting for HDD is correct.
b. Check IDE cable or try another HDD.

Mouse/Printer/Floppy is not working properly.

a. Check if Serial/Parallel/Floppy cable was installed properly.
b. If possible, use another peripheral to double check if the mainboard is

defective.

Keyboard has no response when system boots, or BIOS
shows the message "Keyboard Controller Error ".

a. Press the <Num Lock> key to enable and disable Num Lock function,

check if the LED will ON and OFF accordingly.

b. Is the mainboard fuse burned? (Use an multi-meter to check. The fuse is

usually located near the keyboard socket. It is usually green and marked
as F1,3A/125V.)

COMS data lost, or Battery Low

a. Does the voltage of the onboard battery is lower than 2.5V?
b. Make sure the Clear CMOS jumper is set correctly.

B-3

Troubleshooting

Technical Problem Report Form

Model Name:

Serial Number:

Name:

Contact:

TEL: FAX:

Email Address:

Error Symptom:

System
Configuration:

(Please list model
name and
version.)

B-4

OS: BIOS:

CPU: SIMM:

HDD: CDROM:

VGA: Sound:

Modem: Others:

Appendix C

Jumper Table Summary

Setting the CPU Voltage

S4

ON
OFF
ON
OFF
ON
OFF
OFF
OFF

S5

ON
ON
OFF
OFF
OFF
OFF
ON
ON

S6

ON
ON
ON
ON
OFF
OFF
OFF

OFF

S7

ON
ON
ON
ON
ON
ON
OFF

ON

S8

OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON

Vcore

3.52V

3.45V

3.3V

3.2V

2.9V

2.8V

2.2V

1.8V

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

JP12

1-2
3-4

CPU Type S4 S5 S6 S7 S8 Vcore

I/O Voltage (Vio)

3.3V (default)

3.43V

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.

Warning: If your CPU is IDT C6, note that this processor
supports one of two voltage range, 3.135 ~ 3.465V ( 3.45V) and

3.45 ~ 3.6V ( 3.52V). See the CPU specification to set the
correct voltage.

C-1

Jumper Table Summary

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 ONONON

OFFONONONON

Selecting the CPU Frequency

OFF
OFF

3.52V

3.3V

S1

OFF
ON
ON
OFF
ON
ON
OFF

JP6

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

S2

OFF
OFF
ON
ON
OFF
ON
ON

JP5

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

S3

OFF
OFF
OFF
OFF
ON
ON
ON

JP4

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

CPU Frequency
Ratio

1.5x (3.5x)
2x

2.5x (1.75x)
3x
4x

4.5x

5x

SDRAM

60MHz
66MHz
75MHz
75MHz
83MHz
90MHz
100MHz

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

PCI

30MHz
33MHz
32MHz
37MHz
32MHz
30MHz
33MHz

AGP

60MHz

66MHz
64MHz
75MHz
64MHz
60MHz
66MHz

Warning: SIS 5591 chipset supports maximum 83MHz external
CPU bus clock, the 90MHz and 100MHz settings are for internal
test only, set to 90MHz or 100MHz exceeds the specification of

C-2

Jumper Table Summary

5591 chipset, which may cause serious system damage.
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.

INTEL
Pentium

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

INTEL
Pentium
MMX

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

AMD K5 CPU Core

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

CPU Core
Frequency

CPU Core
Frequency

Frequency

Ratio External

Bus Clock

Ratio External

Bus Clock

Ratio External

Bus Clock

S1 S2 S3 JP6 & JP5 & JP4

S1 S2 S3 JP6 & JP5 & JP4

S1 S2 S3 JP6 & JP5 & JP4

AMD K6 CPU Core

Frequency

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

Ratio External

Bus Clock

S1 S2 S3 JP6 & JP5 & JP4

C-3

Jumper Table Summary

Cyrix 6x86
& 6x86L

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

Cyrix M2 CPU Core

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

MX-PR233 200MHz =

MX-PR266 233MHz = 3.5x 66MHz OFF OFF OFF 1-2 & 2-3 & 2-3
MX-PR300 225MHz =

IDT C6 CPU Core

C6-150 150MHz = 2x 75MHz ON OFF OFF 2-3 & 2-3 & 1-2
C6-180 180MHz = 3x 60MHz OFF ON OFF 2-3 & 2-3 & 2-3
C6-200 200MHz = 3x 66MHz OFF ON OFF 1-2 & 2-3 & 2-3
C6-225 225MHz = 3x 75MHz OFF ON OFF 2-3 & 2-3 & 1-2
C6-240 240MHz = 4x 60MHz ON OFF ON 2-3 & 2-3 & 2-3

CPU Core
Frequency

Frequency

150MHz=

166MHz=3x2x

233MHz =
240MHz =

Frequency

Ratio External

Ratio External

2.5x
2x

3x

3.5x
4x

Ratio External

Bus Clock

Bus Clock

66MHz
75MHz
66MHz

83.3MHz

75MHz
66MHz
60MHz

Bus Clock

S1 S2 S3 JP6 & JP5 & JP4

S1 S2 S3 JP6 & JP5 & JP4

ONONON

OFFONON

OFF
OFF
ON

S1 S2 S3 JP6 & JP5 & JP4

OFF

OFF

ON
OFF
OFF

OFF

1-2 & 2-3 & 2-3

OFF

2-3 & 2-3 & 1-2

OFF

1-2 & 2-3 & 2-3

OFF

1-2 & 2-3 & 1-2

OFF

2-3 & 2-3 & 1-2

OFF

1-2 & 2-3 & 2-3

ON

2-3 & 2-3 & 2-3

Clear CMOS

JP14

1-2

2-3

C-4

Clear CMOS

Normal operation
(default)
Clear CMOS