AOpen MX58+ MX58+ User Manual

Chapter 1

Overview

MX58 Plus is an all-in-one Pentium-based motherboard that features an
onboard video graphics accelerator and a 16-bit sound processor. This
motherboard utilizes the PCI/ISA architecture and ATX form factor and
integrates the SIS 5598 PCIset, a Super I/O controller, and a PCI mode 4
enhanced IDE controller with bus master and Ultra DMA/33 to enhance system
performance. It has 512KB pipelined-burst second-level cache onboard and
supports 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 256MB.

In addition, MX58 Plus also implements many special features.
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.
High Efficient Synchronous Switching Power 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. This motherboard
implements high efficient Synchronous switching design that the temperature of
MOS FET is less than 36 degree C comparing with 57 degree Schottky diode
of Asynchronous design.

RTC Wake Up Timer The Wake Up Timer is more like an alarm, which wakes
up and power on your system at a pre-defined time for specific application. It
can be set to wake up everyday or on specific date within a month. The
date/time accurate is second.

Over Current Protection Circuit The Over Current Protection was very
popular implemented on the Baby AT or ATX +5V/+12V switching power
supply. It is very useful to prevent accidental short circuit when you install the
mainboard, HDD, add-on cards into housing. But unfortunately, the new
generation CPU and chipset use 3.3V/2.8V Voltage which has regulator to
transfer 5V to 3.3V (Vcpuio, chipset, PBSRAM, SDRAM) and 2.8V (CPU
Vcore), and makes 5V Over Current Protection useless. AOpen MX58 Plus

1-1

Overview

supports 3.3V and 2.8V Over Current Protection, in conjunction with 5V/12V
power supply provide the full line Over Current Protection.

FCC DoC certificate MX58 Plus has passed FCC DoC test. The radiation is
very low, you can use any kind of housing.

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

1-2

1.1 Specifications

Overview

Form Factor
Board Size
CPU

System Memory

Second-level Cache
Chipset
Expansion Slots
Serial Port
Parallel Port

Floppy Interface

IDE Interface

USB Interface

PS/2 Mouse
Keyboard
RTC and Battery
BIOS

ATX
245 mm x 245 mm
Intel Pentium Processor P54C, PP/MT (P55C), AMD

K5/ K6/K6-II, Cyrix 6x86/M2 and IDT C6.
FPM (Fast Page Mode) or EDO (Extended Data

Output) 72-pin SIMM x2, and SDRAM 168-pin x2
maximum 256MB.

512KB pipelined-burst cache onboard
SIS 5598 PCIset
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.

Mini-Din PS/2 mouse connector onboard.
Mini-Din PS/2 keyboard connector onboard.
RTC build in chipset, Lithium (CR-2032) battery.
AWARD Plug-and-Play, 2M bit Flash ROM BIOS.
Multi-language versions supported.

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

LED

CPU FAN2

COM1

PRINTER

VGA

JS1

CDIN1

CN3

JP14

JP4

COM2

2.1 Jumper and Connector Locations

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

KB2

I

I

S

S

A

A

P

P
C

I

3

P

C

C

I

I

2

1

JP5
JP6

JP8

JP11

FDC

USB

PS/2 MS

SIMM2
SIMM1

DIMM2
DIMM1

2-2

PANEL

IrDA

HDD

SPWR

BIOS

IDE2

IDE1

Hardware Installation

Jumpers:

JP14: Clear CMOS
JS1: Disable Onboard Audio

Connectors:

PS2: PS/2 mouse connector
KB: PS/2 keyboard connector
COM1: COM1 connector
COM2: COM2 connector
PRINTER: Printer connector
PWR2: ATX power connector
USB: USB connector
FDC: Floppy drive connector
IDE1: IDE1 primary channel
IDE2: IDE2 secondary channel
VGA: VGA connector
CPUFAN1: CPU fan connector
CDUFAN2: CPU fan connector
IrDA: IrDA (Infrared) connector
HDD LED: HDD LED connector
PANEL: Front panel (Multifunction) connector
SPWR: ATX Soft-Power Switch Connector
CDIN1: CD-audio connector
CN3: Mono in (Pin 1-2) and Mic out (Pin 3-4)

2-3

Hardware Installation

3

3

O

N

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.

1 2 3 4 5 6 7 8

OFF ON

2-4

Hardware Installation

O

N

O

N

O

N

O

N

1234567

8

O

N

O

N

2.2.1 Setting the CPU Voltage

S4

ON
OFF
OFF
ON
OFF
OFF
OFF

S5

ON
ON
OFF
OFF
OFF
ON
ON

S6

ON
ON
ON
OFF
OFF
OFF
OFF

S7

ON
ON
ON
ON
ON
OFF

ON

S8

OFF
OFF
OFF
OFF
OFF
OFF
ON

Vcore

3.52V

3.45V

3.2V

2.9V

2.8V

2.2V

1.8V

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

1 2 3 4 5 6 7 8

3.2V

K6-233

2.9V

K6-166/200 or M2

1 2 3 4 5 6 7 8

3.52V

6x86 or K5

1 2 3 4 5 6 7 8

3.45V

P54C

1 2 3 4 5 6 7 8

3.3V

IDT C6

1 2 3 4 5 6 7 8

2.8V

P55C (MMX)

1 2 3 4 5 6 7 8

2.2V

K6-266/300 or K6-II

2-5

Hardware Installation

The following table lists possible settings of current CPU available on the
market. Note that the correct setting may vary because of new CPU product,
please see to your CPU specification for more details.

CPU Type Vcore S4 S5 S6 S7 S8

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

3.3VONONONOFFONONONON

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.

OFF
OFF

2-6

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.

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

2.2.2 Selecting the CPU Frequency

S1

OFF
ON
ON
OFF
ON
ON
OFF
OFF

S2

OFF
OFF
ON
ON
OFF
ON
ON
OFF

S3

CPU Frequency
Ratio

OFF

1.5x (3.5x)

OFF

2x

OFF

2.5x (1.75x)

OFF

3x

ON

4x

ON

4.5x

5x

ON

5.5x

ON

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, Cyrix 6x86 and
AMD K5/K6 CPU are designed
to have different Internal (Core)
and External (Bus) frequency.
The ratio of Core/Bus frequency
is selected by the switch 1-3 of
SW1.

Core frequency = Ratio * External bus clock

3x

4x

2-8

1.5x (3.5x)

2x

2.5x (1.75x)

4.5x

5x

5.5x

Hardware Installation

1 2 3

JP4

JP5

JP6

1 2 3

JP4

JP5

JP6

1 2 3

JP4

JP5

JP6

1 2 3

JP4

JP5

JP6

1 2 3

JP4

JP5

JP6

1 2 3

JP4

JP5

JP6

JP4

JP5

JP6

CPU External Clock

2-3

2-3

1-2

50MHz

2-3

2-3

2-3

55MHz

1-2

2-3

1-2

60MHz

2-3

1-2

1-2

66MHz

1-2

2-3

2-3

75MHz

2-3

1-2

2-3

83MHz

JP4, JP5, JP6 and J25 are the selections of CPU external clock (bus clock),
AGP Clock and PCI Clock.

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

JP4 & JP5 & JP6

JP4 & JP5 & JP6

50MHz

JP4 & JP5 & JP6

JP4 & JP5 & JP6

55MHz

JP4 & JP5 & JP6

JP4 & JP5 & JP6

60MHz

Warning: SIS 5598 chipset supports maximum 75
MHz external CPU bus clock, the 83MHz settings are
for internal test only, set to 83MHz exceeds the
specification of the chipset, which may cause serious
system damage.

Caution: The 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.

66MHz

75MHz

83MHz

INTEL CPU Core Ratio External S1 S2 S3 JP4 & JP5 & JP6

2-9

Hardware Installation

Pentium Frequency Bus Clock

P54C 75

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

75MHz = 1.5x 50MHz OFF OFF OFF 2-3 & 2-3 & 1-2

INTEL
Pentium
MMX

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

Cyrix 6x86
& 6x86L

P120+ 100MHz = 2x 50MHz ON OFF OFF 2-3 & 2-3 & 1-2
P133+ 110MHz = 2x 55MHz ON OFF OFF 2-3 & 2-3 & 2-3
P150+ 120MHz = 2x 60MHz ON OFF OFF 1-2 & 2-3 & 1-2
P166+ 133MHz = 2x 66MHz ON OFF OFF 2-3 & 1-2 & 1-2
P200+ 150MHz = 2x 75MHz ON OFF OFF 1-2 & 2-3 & 2-3

Cyrix M2 CPU Core

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

MX-PR233 200MHz =

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

CPU Core
Frequency

CPU Core
Frequency

Frequency

150MHz=

166MHz=3x2x

233MHz=
240MHz

Ratio External

Ratio External

Ratio External

2.5x
2x

3x

3.5x
4x

Bus Clock

Bus Clock

Bus Clock

66MHz
75MHz
66MHz
83MHz

75MHz
66MHz
60MHz

S1 S2 S3 JP4 & JP5 & JP6

S1 S2 S3 JP4 & JP5 & JP6

S1 S2 S3 JP4 & JP5 & JP6

ONONON

OFFONON

OFF
OFF
ON

OFF

OFF

ON
OFF
OFF

OFF

2-3 & 1-2 & 1-2

OFF

1-2 & 2-3 & 2-3

OFF

2-3 & 1-2 & 1-2

OFF

2-3 & 1-2 & 2-3

OFF

1-2 & 2-3 & 2-3

OFF

2-3 & 1-2 & 1-2

ON

1-2 & 2-3 & 1-2

AMD K5 CPU Core Ratio External S1 S2 S3 JP4 & JP5 & JP6

2-10

Hardware Installation

Frequency Bus Clock

PR75 75MHz= 1.5x 50MHz OFF OFF OFF 2-3 & 2-3 & 1-2
PR90 90MHz = 1.5x 60MHz OFF OFF OFF 1-2 & 2-3 & 1-2
PR100 100MHz = 1.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
PR120 90MHz = 1.5x 60MHz OFF OFF OFF 1-2 & 2-3 & 1-2
PR133 100MHz = 1.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
PR166 116MHz = 1.75x 66MHz ON ON OFF 2-3 & 1-2 & 1-2

AMD K6 CPU Core

Frequency

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

IDT C6 CPU Core

Frequency

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

Ratio External

Bus Clock

Ratio External

Bus Clock

S1 S2 S3 JP4 & JP5 & JP6

S1 S2 S3 JP4 & JP5 & JP6

Note: Cyrix 6x86, 6x86MX (M2) and AMD K5 CPU use P­rating 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.

2-11

Hardware Installation

2.2.4 Clearing the CMOS

JP14

1-2
2-3

The procedure to clear CMOS:

1. Turn off the system and unplug the AC power.

2. Remove ATX power cable from connector PWR2.

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

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

5. Connect ATX power cable back to connector PWR2.

6. Turn on the system power.

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

Clear CMOS

Normal operation (default)
Clear CMOS

new password, if needed.

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

JP14

1
2

Normal Operation

(default)

JP14

1
2

Clear CMOS

2-12

2.2.5 Setting PCI Clock

3

3

3

3

JP8

Setting PCI Clock

1-2

Sync (default)

2-3

Async

JP8 is used to set PCI clock. The default setting
is synchronous, that means PCI clock will be half
of external clock. (For example, if CPU external
clock is set to 66MHz, then the PCI clock will be
33MHz.) However, the specification of PCI clock
is maximum 33 MHz. In order to avoid system
unstable, we recommend you set the PCI clock to
Async if the CPU external clock is set to 75/83
MHz.

Hardware Installation

2.2.5 Disable Onboard VGA

JP11

1-2
2-3

Disable Onboard VGA

Enabled (default)
Disabled

Note: The onboard VGA shares a part of system memory, you
can set the shared memory size from BIOS Setup. In addition,
you have to install your DIMM on DIMM1 slot if you have only a
single DIMM. The same idea is also applied to insert a single
SIMM, you should install the SIMM on SIMM1 slot.

You have to set this jumper to Disabled if
you want to install another VGA card.

Enabled (default)

JP8

1
2

Sync (default)

JP11

1
2

JP8

1
2

Async

JP11

1
2

Disabled

2-13

Hardware Installation

3

3

Note: The AOpen Bonus Pack CD-ROM contains VGA drivers
for this board. For more information, please see the
Readme.txt file in the CDROM.

2.2.5 Disable Onboard Audio

JS1

1-2
2-3

Disable Onboard Audio

Enabled (default)
Disabled

If you want to install other sound card, you
have to disable the onboard audio by
setting this jumper to Disabled.

JS1

1
2

Enabled (default)

JS1

1
2

Disabled

2-14

Hardware Installation

+5V

5V SB

3.3V

2.3 Connectors

2.3.1 Power Cable

The ATX power supply uses 20-pin connector shown below. Make sure you
plug in the right direction.

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

+5V

3.3V

PWR2

2.3.2 ATX Soft-Power Switch Connector

The ATX soft-power switch connector is a 2-pin header on the system board.
Locate the power switch cable from your ATX housing. It is 2-pin female
connector from the housing front panel. Plug this connector to the soft-power
switch connector marked SPWR.

1
2

SPWR

2-15

Hardware Installation

+12V

SENSE

GND

+12V

PS/2 Mouse

2.3.3 Fan

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

CPUFAN2

GND

CPUFAN1

2.3.4 PS/2 Mouse

The onboard PS/2 mouse connector is a 6-pin Mini-Din connector marked
PS2. The view angle of drawing shown here is from back panel of the
housing.

2-16

PCB

Hardware Installation

PS/2 KB

COM1

2.3.5 Keyboard

The onboard PS/2 keyboard connector is a 6-pin Mini-Din connector marked
KB2. The view angle of drawing shown here is from back panel of the
housing.

PCB

2.3.6 Serial Devices (COM1)

The onboard serial connector COM1 is a 9-pin D-type connector on the back
panel of the mainboard.

PCB

2-17

Hardware Installation

1

PRINTER

USB

2.3.6 Serial Devices (COM2)

Plug in the 10-pin flat cable to the COM2 connectors.

2

COM2

10

9

2.3.7 Printer

The onboard printer connector is a 25-pin D-type connector marked PRINTER.
The view angle of drawing shown here is from back panel of the housing.

PCB

2.3.8 USB Device

You can attach USB devices to the USB connector. The motherboard
contains two USB connectors, which are marked as USB.

PCB

2-18

Hardware Installation

34

33

1

40

2

39

1

40

2

39

2.3.9 Floppy Drive

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

FDC on the system board.

2

1

FDC

2.3.10 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.

IDE2

IDE1

2-19

Hardware Installation

(3rd)

(4th)

4

+

+

4

+

+

4

+

+

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 the following figure.

IDE2 (Secondary Channel)

Slave

IDE1 (Primary Channel)

Slave
(2nd)

2.3.11 Hard Disk LED

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

Pin

1
2
3
4

1
2
3

HDD LED

connector at

pin 1-2

Master

Master

(1st)

Description

HDD LED
GND
GND
HDD LED

2-pin

1
2
3

HDD LED

2-pin

connector at

pin 3-4

2-20

2.3.12 Panel Connector

1

11

10

20

+

+

+

+

10

20

Hardware Installation

The Panel (multifunction) connector is
a 20-pin connector marked as PANEL
on the board. Attach the power LED,
keylock, speaker, and reset switch 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.

ACPI & POWER LED

KEYLOCK

SPEAKER

SPEAKER

Keylock

ACPI &
Power LED

Speaker

GND

GND

+5V

+5V

GND

NC

PANEL

PANEL

1

11

10 20

+5V
GND
Reserved
GND
NC
NC
GND
NC
RESET
GND

Reset

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.

1

11

PANEL

+5V

2-21

Hardware Installation

2.3.13 IrDA Connector

The IrDA connector can be configured to support wireless infrared module,
with this module and application software such as Laplink or Win95 Direct
Cable Connection, user can transfer files to or from laptops, notebooks,
PDA and printers. This connector supports HPSIR (115.2Kbps, 2 meters),
ASK-IR (56Kbps) and Fast IR (4Mbps, 2 meters).

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.

Pin

1
2
3
4
5
6

Description

+5V
NC
IRRX
GND
IRTX
NC

1
2
3
4
5
6

IrDA

2-22

Hardware Installation

2.3.16 CD Audio Connector

This connector is used to connect CD audio cable.

1
2
3
4

CDIN1

2.3.16 Mono In/Mic Out Connector

This connector is used to connect Mono In/Mic Out
connector of an internal modem card. The pin 1-2 is
Mono In, and the pin 3-4 is Mic Out. Please note
that there is no standard for this kind of connector
yet, only some internal modem cards implement this
connector.

Please see the pin definitions to connect the cable.

Pin

1
2
3
4

Description

Mono In
GND
GND
Mic Out

1
2
3
4

Mono In/Mic Out

2-23

Hardware Installation

Pin 1

Pin 1

2.4 Configuring the System Memory

This mainboard has two 168 pin
DIMM sockets (Dual-in-line Memory
Module) and two 72 pin SIMM sockets
that allow you to install system
memory up to 256MB.

If you want to install DRAMs on
DIMM2 and SIMM at the same time, it
is very important to identify
single/double side. Under this
configuration, only single side DRAMs
are acceptable.

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 SDRAM,
which can be identified by the 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).

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.

2-24

Hardware Installation

168

Pin 129

Pin 114

Warning: If you want to install DRAMs on DIMM2 and DIMM3 at
the same time, it is very important to identify single/double side.
Under this configuration, only single side DRAMs are acceptable.

II. Speed: Normally marked 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.

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 choosing a 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)

DIMM modules.

2-25

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
256MB system memory.

SIMM1 SIMM2 Subtotal of

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

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

Bank0

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

Warning: It is not recommended 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.

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.

2-26

Hardware Installation

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.

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.

2-27

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

2-28

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
4M by 16 4Mx64 x1 4 32MB Yes
8M by 8 8Mx64 x1 8 64MB Yes
8M by 8 8Mx64 x2 16 128MB 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.

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.

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.

2-29

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

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

2-30

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

3-4

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

None
360KB 5.25"

1.2MB 5.25"
720KB 3.5"

1.44MB 3.5"

2.88MB 3.5"

These items select floppy drive type. The available settings
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.

AWARD BIOS

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

Enabling this parameter activates the secondary cache
(currently, PBSRAM cache). Disabling the parameter

Enabled
Disabled

slows down the system. Therefore, we recommend that
you leave it enabled unless you are troubleshooting a
problem.

BIOS Features à 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
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 Floppy Seek

Boot Up Floppy
Seek

Enabled
Disabled

BIOS Features à Boot Up NumLock Status

Boot Up
NumLock Status

On
Off

BIOS Features à Boot Up System Speed

Boot Up System
Speed

High
Low

BIOS Features à Gate A20 Option

Gate A20 Option

Normal
Fast

When enabled, the BIOS issues the seek command to
the floppy drive during POST to move floppy drive head
forward and backward.

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.

Select High or Low system speed after boot.

This item is used to select Gate A20 Option.

BIOS Features à Memory Parity Check

Memory Parity
Check

Disabled
Enabled

This item is used to enable or disable DRAM parity
check function.

BIOS Features à Typematic Rate Setting

Typematic Rate
Setting

Enabled
Disabled

3-8

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

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

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>.

AWARD BIOS

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.

3-9

AWARD BIOS

BIOS Features à OS Select for DRAM > 64MB

OS Select for
DRAM > 64MB

OS/2
Non-OS/2

BIOS Features à Video BIOS Shadow

Video BIOS
Shadow

Enabled
Disabled

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

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

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.

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 that 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.

3-11

AWARD BIOS

Chipset Features à EDO/FPM DRAM Control

EDO/FPM Timing
Control

Fast
Normal

Chipset Features à SDRAM Control

SDRAM Timing
Control

Fast
Normal

Chipset Features à Refresh Cycle Time (us)

Refresh Cycle Time
(us)

15.6

62.4

124.8

187.2

Chipset Features à RAMW# Assertion Timing

RAMW# Assertion
Timing

2T
3T

This item is used to control EDO/FPM timing. If you
find system unstable, please try to set this item to
Normal.

This item is used to control SDRAM timing. If you
find system unstable, please try to set this item to
Normal.

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

This parameter specifies the number of clocks
required to assert the DRAM write control signal
when read cycle followed by write cycle.

Chipset Features à SDRAM CAS Latency

SDRAM CAS
Latency

2T
3T

3-12

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

AWARD BIOS

Chipset Features à SDRAM Wait State Control

SDRAM Wait State
Control

0WS
1WS

Chipset Features à Read Prefetch Memory RD

Read Prefetch
Memory RD

Enabled
Disabled

Chipset Features à CPU to PCI Post Write

CPU to PCI Post
Write

3T
4T
Disabled

Chipset Features à CPU to PCI Burst Mem. WR

CPU to PCI Burst
Mem. WR

Enabled
Disabled

This parameter specifies the number of clocks of
SDRAM Wait State Control during Precharge.

0WS: zero wait state.
1WS: one wait state.

This item lets you control the Read Prefetch of the
memory read of PCI bus command. When enabled,
Memory Read Multiple and Memory Read Line of PCI
commands always do prefetch.

This parameter specifies the number of clocks for
CPU to PCI Post Write cycle.

This item lets you control the CPU to PCI Burst
Memory Write.

Chipset Features à ISA Bus Clock Frequency

ISA Bus Clock
Frequency

PCICLK/3
PCICLK/4

7.159MHz

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.

3-13

AWARD BIOS

Chipset Features à System BIOS Cacheable

System BIOS
Cacheable

Enabled
Disabled

Chipset Features à Video BIOS Cacheable

Video BIOS
Cacheable

Enabled
Disabled

Chipset Features à Memory Hole At 15M-16M

Memory Hole At
15M-16M

Enabled
Disabled

Chipset Features à VGA Shared Memory Size

VGA Shared
Memory Size

0.5MB
1MB

1.5MB
2MB

2.5MB
3MB

3.5MB
4MB

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

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

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.

The onboard VGA need to share a memory size with
the system memory. You may set a larger size for
getting better performance. The shared memory size
is up to 4MB.

Chipset Features à VGA Memory Clock (MHz)

VGA Memory Clock

55
60
66

3-14

This item is used to set the VGA memory clock.
You can get the best performance by setting this
item to 66.

AWARD BIOS

3.5 Power Management Setup

The Power Management Setup screen enables you to control the mainboard’s
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

Power Management à Video Off Option

Video Off Option

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

Power Management à Video Off Method

Video Off Method

Blank Screen
V/H SYNC+Blank
DPMS

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.

To turn off video monitor at which power down mode.

This determines the way that monitor is off. Blank
Screen writes blanks to video buffer. V/H
SYNC+Blank allows BIOS to control VSYNC and
HSYNC signals. This function applies only for DPMS
(Display Power Management Standard) monitor. The
DPMS mode uses DPMS function provided by VGA
card.

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

Doze Speed (div by)

1
2
3
4
5
6
7
8

3-16

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 Modem Use IRQ

Modem Use IRQ

NA
3
4
5
6
7
9
10
11

This item tells BIOS/Chipset the IRQ of your modem.
This allows BIOS/Chipset to monitor the activities of
the modem connected to your system.

Power Management à HDD Power Down

HDD Power Down

Disabled
1 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).

Power Management à Doze Mode

Doze Mode

Disabled
20 Sec
1 Min
5 Min
10 Min
15 Min
20 Min
30 Min
40 Min

This item lets you set the period of time after which
the system enters into Doze mode. In this mode, the
CPU clock slows down. The ratio is specified in the
"Throttle Duty Cycle". Any activity detected returns the
system to full power. The system activity (or event) is
detected by monitoring the IRQ signals.

AWARD BIOS

3-17

AWARD BIOS

Power Management à Standby Mode

Standby Mode

Disabled
20 Sec
1 Min
5 Min
10 Min
15 Min
20 Min
30 Min
40 Min

Power Management à Suspend Mode

Suspend Mode

Disabled
20 Sec
1 Min
5 Min
10 Min
15 Min
20 Min
30 Min
40 Min

This item lets you set the period of time after which the
system enters into Standby mode. In this mode, CPU
clock slows down, hard disk will be shut off and the
monitor power-saving feature activates. Any activity
detected returns the system to full power. The system
activity (or event) is detected by monitoring the IRQ
signals.

This item lets you set the period of time after which the
system enters into Suspend mode. In this mode, CPU
clock stops, all other devices will be shut off. Any
activity detected returns the system to full power. The
system activity(or event) is detected by monitoring the
IRQ signals.

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

COM Ports Activity

Enabled
Disabled

3-18

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

Power Management à IRQ3 (COM2)
Power Management à IRQ4 (COM1)
Power Management à IRQ5 (LPT2)
Power Management à IRQ6 (Floppy Disk)
Power Management à IRQ8 (RTC Alarm)
Power Management à IRQ9 (IRQ2 Redir)
Power Management à IRQ10 (Reserved)
Power Management à IRQ11 (Reserved)
Power Management à IRQ12 (PS/2 Mouse)
Power Management à IRQ13 (Coprocessor)
Power Management à IRQ14 (Hard Disk)
Power Management à IRQ15 (Reserved)

IRQ2 (COM2)

Enabled
Disabled

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

AWARD BIOS

3-19

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

3-20

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.

AWARD BIOS

PNP/PCI Configuration à Resources Controlled By

Resources
Controlled by

Auto
Manual

PNP/PCI Configuration à Reset Configuration Data

Reset Configuration
Data

Enabled
Disabled

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

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.

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.

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).

3-21

AWARD BIOS

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

DMA 0
assigned to

Legacy ISA
PCI/ISA PnP

Power Management à PCI IDE 2nd Channel

PCI IDE 2nd
Channel

Disabled
Enabled

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

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.

This item is used to enable or disable the 2nd IDE
channel.

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

3-22

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.

AWARD BIOS

PCI Slot Location 1

(pin A6)

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

Location 2
(pin B7)

Location 3
(pin A7)

Location 4
(pin B8)

PNP/PCI Configuration à Used MEM Base Addr

Used MEM base
addr

N/A
C800
CC00
D000
D400
D800
DC00

This item, in conjunction with the "Used MEM
Length", lets you set a memory space for non-PnP
compatible ISA card. This item specifies the memory
base (start address) of the reserved memory space.
The memory size is specified in the "Used MEM
Length".

PNP/PCI Configuration à Used MEM Length

Used MEM Length

8K
16K
32K
64K

If your ISA card is not PnP compatible and requires
special memory space to support its function, specify
the memory size in this parameter to inform the PnP
BIOS to reserve the specified memory space for
installed legacy ISA card.

3-23

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 (for example, a file server using double­sided 8MB SIMM x4 and SCSI plus Network card occupying the PCI and ISA
slots).

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.

3-24

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

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

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

3-25

AWARD BIOS

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 UDMA
Integrated Peripherals à Primary Slave UDMA
Integrated Peripherals à Secondary Master UDMA
Integrated Peripherals à Secondary Slave UDMA

Primary Master
UDMA

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 Burst Mode

IDE Burst Mode

Enabled
Disabled

This item lets you control the bottom address of the
ISA address hole.

Integrated Peripherals à IDE Data Port Post Write

IDE Data Port Post
Write

Enabled
Disabled

3-26

This item lets you control the IDE Data Port Write
function.

AWARD BIOS

Integrated Peripherals à IDE HDD Block Mode

IDE HDD Block
Mode

Enabled
Disabled

Integrated Peripherals à Onboard FDD Controller

Onboard FDD
Controller

Enabled
Disabled

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

Onboard Serial
Port 1

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

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.

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 UART 2 Mode

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.

3-27

AWARD BIOS

• 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.

Integrated Peripherals à IR Function Duplex

IR Function Duplex

Full
Half

Integrated Peripherals à Onboard Parallel Port

Onboard Parallel
Port

3BC/IRQ7
378/IRQ7
278/IRQ7
Disabled

This item lets you set the duplex mode for the IR
communication. Full - Allows IR communication in
bidirectional mode. Half - Allows IR communication in
single direction only.

Note: This option appears only if the IR
function is activated and the Onboard UART 2
Mode parameter is NOT set to Standard.

This item controls the onboard parallel port address
and interrupt.

3-28

Note: If you are using an I/O card with a

parallel port, make sure that the addresses and
IRQ do not conflict.

AWARD BIOS

Integrated Peripherals à Onboard Parallel Mode

Onboard Parallel
Mode

Normal
EPP
ECP
ECP + EPP

Integrated Peripherals à ECP Mode Use DMA

ECP Mode Use
DMA

3
1

Integrated Peripherals à Parallel Port EPP Type

Parallel Port EPP
Type

EPP1.7
EPP1.9

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.

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

This item is used to select EPP type.

Integrated Peripherals à PS/2 mouse function

PS/2 mouse function

Disabled
Enabled

This item is used to enable or disable PS/2 mouse
function.

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.

3-29

AWARD BIOS

Integrated Peripherals à USB Keyboard Support

USB Legacy Support

Enabled
Disabled

Integrated Peripherals à Power Button Over Ride

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.

Power Button Over
Ride

Enabled
Disabled

This is a specification of ACPI and supported by
hardware. When Enabled, the soft power switch on
the front panel can be used to control power On,
Suspend and Off. If the switch is pressed less than 4
sec during power On, the system will go into Suspend
mode. If the switch is pressed longer than 4 sec, the
system will be turned Off. The default setting is
Disabled, soft power switch is only used to control On
and Off, there is no need to press 4 sec, and there is
no Suspend.

3-30

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.

3-31

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
MX58R110.BIN, which means model MX58 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, MX58R110.BIN)

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

3-32

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, MX58R110.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.

3-33

Chapter 4

SPK

MIC

LINE-IN

Tape Deck,

Speakers

Microphone

Headphones

CD Player

Audio

This motherboard comes with a 16-bit sound processor (Crystal CX4235)
onboard.

Game Port

PCB

To fully utilize the audio functions, you may connect various peripheral devices
that the audio chip supports. The following figure shows the different devices
that you can connect.

Stereo
Amplifier

SPK

Line-in

Mic

Synthesizer,

etc.

4-1

Audio

4.1 Features

The onboard audio has the following features:

Advanced technology support

• Microsoft Direct Sound

• Plug and Play

MIDI interface

• Built-in MIDI interface for external MIDI devices

Software-controllable audio

• Supports various audio devices all controllable through software

• Adjusts master volume, CD audio, line-in, and microphone inputs

• Software setting of I/O address, DMA and IRQ

Stereo digitized voice channel

• Full-duplex, 16-bit digital audio playback and recording in both stereo and

mono modes

• Programmable sampling rate from 8 KHz to 44.1 KHz

3D Sound-Surround

• Adjustable Space effect via software

• Preset capability (maximum of three different settings)

4-2

Audio

4.2 Setting Up in Windows 95

AOpen Bonus Pack CD-ROM contains the Windows 95 drivers and software
(including the Music Center application). Please see the online help for details.

Note: Refer to your Windows 95 manual or online
help for any questions on Windows 95.

4.2.1 Installing the Drivers and the Application

After turning on the system, Windows 95 begins loading and starts detecting
new hardware installed on the system.

1. When Windows 95 detects the presence of the onboard audio chip, it
begins to build the CX4235 driver database. The New Hardware Found
dialog box displays.

2. Select Driver from disk provided by hardware manufacturer and click
on OK. Windows 95 prompts you for the driver disk.

3. Specify the path of the Win95 driver from your CD-ROM drive, then click
on OK. The system will copy the necessary driver files to your hard disk
drive.

Tip: Prepare the Windows 95 CD-ROM disk before
setting up the onboard audio. Windows 95 will
prompt you to insert the Windows 95 CD-ROM disk
when you install the joystick or MIDI device.

Note: If the file being copied is older than the file
currently existing in your system, we suggest you to
keep the existing file.

4. Windows 95 makes changes to the system settings and begins detecting
the following new hardware components:

• Crystal PnP Audio System Joystick

• Crystal PnP Audio System Control Registers

• Crystal PnP Audio System MPU-401 Compatible

4-3

Audio

• Crystal PnP Audio System CODEC

5. Upon initial installation, the setup process begins setting up the software.

Windows 95 makes final changes to the system settings.

4.2.2 Removing the Drivers

Follow these steps to remove or uninstall the drivers:

1. Execute SETUP.EXE on driver disk & click on Uninstall Driver.

2. Click on Uninstall Crystal Drivers to uninstall the drivers.

The uninstallation process automatically removes the drivers and changes the
system registry settings.

Important: After removing the drivers, remember to
remove the audio chip when you shutdown from the
current Windows 95 session; otherwise, Windows 95
will again detect the audio chip at the next startup.

4-4

Audio

4.3 Setting Up in DOS and Windows 3.x

4.3.1 Installing the Drivers and the Application

Follow these steps to install the drivers and the application:

1. Insert AOpen Bonus Pack into the appropriate CDROM drive.

2. At the DOS prompt, type

x:\Mx58plus\Sound\Driver\Win31\setup e

depending on your CD-ROM drive.

3. Select the install option to start the installation process. A confirmation
screen displays.

4. This screen describes the files setup will modify during installation. Read
this message carefully. Select Yes to proceed with the installation. The
install path confirmation screen displays.

5. Confirm the installation path by selecting Begin Installation. You can
modify the source and destination directories. The Windows applications
installation screen displays.

6. Press e if you want to install the Windows applications and drivers.
Otherwise, press m. The hardware settings screen displays.

7. Select Accept the above settings to install the drivers and applications.
You can modify any of the options before you begin installation.

If you selected to install the Windows drivers and applications, the
Windows-specific hardware settings screen displays.

8. Select Accept the above settings to install the Windows drivers and
applications. You can modify any of the options before you begin
installation.

Skip this step if you did not select to install the Windows drivers and
applications.

9. Follow the screen instructions to complete the installation.
The installation program automatically updates your profiles

(AUTOEXEC.BAT, CONFIG.SYS, and SYSTEM.INI) so that your
hardware and software work properly.

4-5

Audio

Note: Before any changes are made to your
AUTOEXEC.BAT, CONFIG.SYS, WIN.INI and
SYSTEM.INI files, backups of your original files are
copied to the audio directory and are renamed as
AUTOEXEC.###, CONFIG.###, WIN.### and
SYSTEM.### respectively.

10. Reboot the system after installation.

Important: You must reboot the system. The
onboard audio does not work unless you reboot.

4.3.2 Removing the Drivers

Follow these steps to remove or uninstall the drivers:

1. Change the directory to where the audio driver files are located and type
the following at the DOS prompt:

setup e

2. Select the uninstall option to start the uninstallation process. Follow the
screen instructions to complete the process.

4-6

Audio

4.4 Setting Up in NT3.51 / NT4.0

4.4.1 Installing the Audio Drivers

Follow these steps to install the audio drivers:

1. For NT3.51, select DRIVERS from control panel.
For NT4.0, select MULTIMEDIA from control panel and click on the
Devices tab.

2. Press the ADD button. Select Unlisted or Updated Drivers and press
OK.

3. Browse and select X:\Mx58plus\Sound\Driver\WinNT.
(X: is your CD-ROM drive.)

4. Press OK to continue with the installation.

5. An Audio Setup dialog box will appear. Please select the default
configuration resource and press OK.

6. Click on the Restart Now button.

4.4.2 Install MPU-401/Joystick Driver

Follow these steps to install the MPU401 or joystick drivers:

1. For NT3.51, select DRIVERS from control panel.
For NT4.0, select MULTIMEDIA from control panel and click on the
Devices tab.

2. Press the ADD button. Select MPU-401 Compatible Driver /Microsoft
Sidewinder 3D Pro Joystick and press OK.

3. Place your NT4.0/NT3.51 installation CD and press OK (the default path
is the i386 directory).

4. The Generic MPU-401/Joystick Setup dialog box will pop up. Select the
default configuration resource and press OK.

5. Click on the Restart Now button.

4-7

Audio

4.5 Applications

4.5.1 Music Center

To startup this application, please click the Music Center Icon.

MIDI Player: plays MIDI audio files

3D
Controller:

controls the
3D effects

CD Player:

plays audio
CDs

Wave Player:

plays and
records
waveform
audio files

Multimedia Mixer: controls the combination and
balance of sound output from different channels

For more information, please refer to the online help.

4-8

4.5.2 MIDI Board

To startup this application software, please click the MIDI Board Icon.

Audio

Tone Button: Sharp or disminish
background music by the 12 tone buttons.

MIDI Board Notes: Move cursor over
the screen keyboard and click for
playing or strick corrospondence key
on PC keyboard to play specific tone.

Rhythm & Tempo: To
play several types of
background music.

Program Tuner: Drag the
yellow point to select specific
program for different
instrument tune.

Menu Button:
Turn on/off Menu.

HotKey Button:

Show keyboard
mapping.

4.5.3 MIDI Player

MIDI player is very similar as Media Player that comes with Windows 95, but it
is able to dynamic switch MIDI devices from one to another while playing MIDI
file, so you can enjoy the sound quality between different MIDI device
obviously.

4-9

Appendix A

BIOS revision

Frequently Asked Question

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: How can I identify the model name & revision of the mainboard from

PCB?

A: The AOpen mainboard revision appears as REV:X.X on the PCB, usually it is

under beneath of AOpen Logo & mainboard model name. For example,
“AX6L REV:1.2” shall appear on the PCB as follows:

AX6L

REV:1.2

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 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.

A-1

Frequently Asked Questions

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.

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.

A-2

AP5T

Test To Comply
With FCC Standards

FOR HOME OR OFFICE USE

Frequently Asked Questions

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

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
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

Q: What is ACPI (Advanced Configuration & Power Interface) and OnNow?

A: The ACPI is new power management specification of 1997 (PC97). It intends

to save more power by taking full control of power management to operating
system and not through BIOS. Because of this, the chipset or super I/O chip
needs to provide standard register interface to OS (such as Win97) and
provides the ability for OS to shutdown and resume power of different part of
chip. The idea is a bit similar to the PnP register interface.

30ns 4 120ns (1/120ns) x 2byte x2 = 33MB/s

Clock
count

Cycle
time

Data Transfer rate

A-3

Frequently Asked Questions

ACPI defines momentary soft power switch to control the power state
transition. Most likely, it uses the ATX form factor with momentary soft power
switch. The most attractive part of ACPI for desktop user is probably the
"OnNow" feature, an idea from notebook. This feature allows you to
immediately resume to your original work without the long time waiting from
bootup, entering Win95 and running Winword. The AX5T with Intel TX chipset
can support ACPI.

Q: What is ATX Soft Power On/Off and Momentary Switch?

A: The Soft Power On of the ATX specification means to provide a standby

current for special circuit to wait for wakeup event when main power is off. For
example, Infrared wakeup, modem wakeup, or voice wakeup. Currently, the
most simple usage is to provide standby current for power switch circuit so
that power switch can turn on/off the main power through soft power control
pin. The ATX power specification does not mention anything about the power
switch type. You can use toggle or momentary switch, note that ACPI
specification requires momentary switch for power state control. All the
AOpen ATX MBs support momentary switch.

Soft Power Off means to turn off system through software, Windows 95
Shutdown function can be used to verify if your mainboard supports soft power
off.

Q: What is the AGP (Accelerated Graphic Port)?

A: AGP is a PCI-like bus interface targeted for high-performance 3D graphic.

AGP supports only memory read/write operation and single-master single­slave one-to-one only. The AGP uses both rising and falling edge of the
66MHz clock and produces 66MHz x 4byte x 2 = 528MB/s data transfer rate.

Q: Does Pentium, Pentium Pro or Pentium II support Deturbo mode?

A: The Deturbo mode was originally designed to slow down CPU speed for old

applications (especially old games). It uses programming loop to wait or delay
special event. This programming method is considered very bad since the
delay of loop highly depends on the CPU speed and the application fails at
high-speed CPU. Almost all new applications (including games) use RTC or
interrupt to wait event. There is no need for Deturbo mode now. The Turbo
switch is now used as Suspend switch. However, some MBs still support
Turbo/Deturbo function via keyboard. You can set the system to Deturbo by
pressing <Ctrl> <Alt> <->. To back to Turbo mode, press <Ctrl> <Alt> <+>.
Note that the Deturbo mode has been removed in new MBs since these
require more code space in Flash ROM.

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

even though the APM under BIOS Setup is enabled.

A-4

Frequently Asked Questions

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: 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

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 LDCM (LAN Desktop Client Manager)?

A: This is a software of Intel. The major goal is to provide an easy way for

corporate network administrator to monitor the status of all the clients
(workstation). You need at least DMI BIOS for LDCM. AOpen BIOS is also
DMI ready but unfortunately, Intel LDCM needs Intel network card and ATI
VGA to work properly. It is obviously not suitable for home user to pay LDCM
extra cost.

A-5

Frequently Asked Questions

Q: What is ADM (Advanced Desktop Manager)?

A: This is a desktop client and server management software developed by

AOpen. It is similar as Intel LDCM with some improvement. ADM is not only
for corporate network management, it can also be used as system status
monitoring utility, for example, CPU fan, thermal and system voltage
monitoring.

Features ADM 2.1 LDCM 3.0
VGA card
Network card
Support DMI BIOS 2.0
Support Win95
Support Win NT
Real-Time CPU/Memory

Utilization Monitoring
Multi-Machine

Monitoring on One Screen
Remote Management

Protocol
Standard SNMP Trap

Remote File Transfer

No limitation Only ATI
No limitation Only Intel
Yes Yes
Yes Yes
Yes Yes
Yes No

Yes No

Standard SNMP
protocol

Yes (so that can work
with standard software
such as HP Open View)

No Yes

Intel proprietary RAP
protocol

No

A-6

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.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

CPU Type Vcore S4 S5 S6 S7 S8

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

3.3VONONONOFFONONONON

Warning: Make sure that you have installed CPU fan properly if
Intel PP/MT-233 or AMD K6 is being selected to use. It may
cause your system unstable if you can not meet the heat
dissipation requirement from above CPU. It is recommended to
adopt larger fan on these CPU for better air flow in the system.

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.

OFF
OFF

C-1

Jumper Table Summary

Selecting the CPU Frequency

S1

OFF
ON
ON
OFF
ON
ON
OFF
OFF

JP4

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

S2

S3

CPU Frequency
Ratio

OFF
OFF
ON
ON
OFF
ON
ON
OFF

JP5

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

OFF

1.5x (3.5x)

OFF

2x

OFF

2.5x (1.75x)

OFF

3x

ON

4x

ON

4.5x

5x

ON

5.5x

ON

JP6

CPU External Clock

1-2

50MHz

2-3

55MHz

1-2

60MHz

1-2

66MHz

2-3

75MHz

2-3

83MHz

Warning: SIS 5598 chipset supports maximum 75 MHz
external CPU bus clock, the 83MHz settings are for
internal test only, set to 83MHz exceeds the
specification of the chipset, which may cause serious
system damage.

INTEL
Pentium

P54C 75

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

INTEL CPU Core Ratio External S1 S2 S3 JP4 & JP5 & JP6

CPU Core
Frequency

75MHz = 1.5x 50MHz OFF OFF OFF 2-3 & 2-3 & 1-2

Ratio External

Bus Clock

S1 S2 S3 JP4 & JP5 & JP6

C-2

Jumper Table Summary

Pentium
MMX

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

Cyrix 6x86
& 6x86L

P120+ 100MHz = 2x 50MHz ON OFF OFF 2-3 & 2-3 & 1-2
P133+ 110MHz = 2x 55MHz ON OFF OFF 2-3 & 2-3 & 2-3
P150+ 120MHz = 2x 60MHz ON OFF OFF 1-2 & 2-3 & 1-2
P166+ 133MHz = 2x 66MHz ON OFF OFF 2-3 & 1-2 & 1-2
P200+ 150MHz = 2x 75MHz ON OFF OFF 1-2 & 2-3 & 2-3

Cyrix M2 CPU Core

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

MX-PR233 200MHz =

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

Frequency Bus Clock

CPU Core
Frequency

Frequency

150MHz=

166MHz=3x2x

233MHz=
240MHz

Ratio External

Ratio External

2.5x
2x

3x

3.5x
4x

Bus Clock

Bus Clock

66MHz
75MHz
66MHz
83MHz

75MHz
66MHz
60MHz

S1 S2 S3 JP4 & JP5 & JP6

S1 S2 S3 JP4 & JP5 & JP6

ONONON

OFFONON

OFF
OFF
ON

OFF

OFF

ON
OFF
OFF

OFF

2-3 & 1-2 & 1-2

OFF

1-2 & 2-3 & 2-3

OFF

2-3 & 1-2 & 1-2

OFF

2-3 & 1-2 & 2-3

OFF

1-2 & 2-3 & 2-3

OFF

2-3 & 1-2 & 1-2

ON

1-2 & 2-3 & 1-2

AMD K5 CPU Core

Frequency

PR75 75MHz= 1.5x 50MHz OFF OFF OFF 2-3 & 2-3 & 1-2
PR90 90MHz = 1.5x 60MHz OFF OFF OFF 1-2 & 2-3 & 1-2
PR100 100MHz = 1.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
PR120 90MHz = 1.5x 60MHz OFF OFF OFF 1-2 & 2-3 & 1-2
PR133 100MHz = 1.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
PR166 116MHz = 1.75x 66MHz ON ON OFF 2-3 & 1-2 & 1-2

AMD K6 CPU Core

Frequency

Ratio External

Bus Clock

Ratio External

Bus Clock

S1 S2 S3 JP4 & JP5 & JP6

S1 S2 S3 JP4 & JP5 & JP6

A-3

Jumper Table Summary

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

IDT C6 CPU Core

Frequency

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

Note: Cyrix 6x86, 6x86MX (M2) and AMD K5 CPU use P­rating 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.

Ratio External

Bus Clock

S1 S2 S3 JP4 & JP5 & JP6

Clear CMOS

JP14

1-2
2-3

Clear CMOS

Normal operation (default)
Clear CMOS

Setting PCI Clock

JP8

1-2
2-3

Setting PCI Clock

Sync (default)
Async

Disable Onboard VGA

JP11

1-2
2-3

C-4

Disable Onboard VGA

Enabled (default)
Disabled