AOpen AX5T-HW User Manual

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 awristground strapandattach 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

WKUP

JP14

HDD LED

IrDA

PIIX4

TXC

JP4

FAN2

2.1 Jumper and Connector Locations

The following figure shows the location of the jumpers and connectors on the
mainboard.

I
S
A
4

PANEL

Jumpers:

COM2

I

I
S
A
3

I

S

S

A

A

2

1

BIOS

P

P

C

C

I

I

3

4

IDE2

IDE1

FDC

P

P

C

C

I

I

2

JP11

USB

1

SPWR

FAN1

PRINTER KB MS

M
M

JP3 JP2 JP1

S

S

I

I
M
M

1

2

JP6
JP5

COM1

S

S

I
M
M

3

D

D

I

I

I

M

M

M

M

M

M

4

2

1

JP1,JP2,JP3: CPU frequency ratio
JP4,JP5,JP6: CPU external (bus) clock
JP11: CPU core voltage setting (Vcore)
JP14: Clear CMOS

2-2

Hardware Installation

Connectors:

PS2 MS: PS/2 mouse connector
KB2: 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
FAN1: CPU fan connector (2-pin normal type)
FAN2: CPU fan connector (3-pin type for fan monitoring function)
WKUP: IR & MODEM wake-up connector
IrDA: IrDA (Infrared) connector
HDD LED: HDD LED connector
PANEL: Front panel (Multifunction) connector

2-3

Hardware Installation

3

3

2.2 Jumpers

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

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

Open

1
2

Short

1
2

Jumper set at 1-2

1
2

Jumper set at 2-3

1
2

2-4

2.2.1 Setting the CPU Voltage

11

11

11

11

11

Hardware Installation

JP11

1-2
3-4
5-6
7-8
9-10
11-12

CPU Core Voltage (Vcore)

3.45V (Intel P54C)

3.52V (Cyrix or AMD K5)

2.9V (AMD K6-166/200 or Cyrix M2)

2.8V (MMX P55C)

3.2V (AMD K6-233)

2.5V/2.2V/2.0V (Reserved)

JP11 is used to select CPU
core voltage (Vcore),
normally it is set to default

3.45V for INTEL Pentium
P54C. It must be changed if
you have CPU with different
core voltage, such as
INTEL PP/MT MMX (P55C),
AMD K5/K6 and Cyrix 6x86,
refer to the CPU
specification for more
details.

JP11

1
3
5
7
9

3.45V
P54C

JP11

1

2
4
6

8
10
12

2

3

4

5

6

7

8

9

10
12

3.52V

6x86 or

K5

JP11

1
3
5
7
9

2.9V
K6-166
K6-200

JP11

1

2

3

4

5

6

7

8

9

10
12

2.8V

MMX

P55C

M2

Warning: Please make sure that you have installed CPU fan
properly if Intel PP/MT-233 or AMD K6-200/233 is being
selected to use. It may cause your system unstable if you can
not meet the heat dissipation requirement fromabove CPU type.
It is recommended to adopt larger fan on these CPU for better
air flow in the system.

JP11

1

2
4
6

8
10
12

2

3

4

5

6

7

8

9

10
12

3.2V

K6-233

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: JP11 pin 11-12 is reserved for future CPU, the most
possible value is 2.0V. It is not yet decided when this manual is
printed. Use voltage meter or check your distributor before you
use pin 11-12.

2-5

Hardware Installation

CPU Type JP11 Vcore Vio Vcpuio

INTEL P54C Single Voltage 1-2 3.45V 3.45V Vcore
INTEL MMX P55C Dual Voltage 7-8 2.8V 3.45V Vio
AMD K5 Single Voltage 3-4 3.52V 3.45V Vcore
AMD K6-166/200 Dual Voltage 5-6 2.9V 3.45V Vio
AMD K6-233 Dual Voltage 9-10 3.2V 3.45V Vio
Cyrix 6x86 Single Voltage 3-4 3.52V 3.45V Vcore
Cyrix 6x86L Dual Voltage 7-8 2.8V 3.45V Vio
Cyrix M2 Dual Voltage 5-6 2.9V 3.45V Vio

Caution: Above table is 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.

2.2.2 Selecting the CPU Frequency

JP3

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

2-6

JP2

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

JP1

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

CPU Frequency

Ratio

1.5x (3.5x)
2x

2.5x (1.75x)
3x
4x

4.5x
5x

5.5x

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
byJP1, JP2, which CPU is using to
multiply external clock and produce
internal frequency. Note that JP3 is
reserved for future CPU.

Note: JP3 is reserved for future CPU. It is NC pin (no connection)
for current CPU on the market. It should be no harm to connect to
1-2 or 2-3. If you find any unstable problem, please try to remove
the jumper cap, and leave it Open.

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.

Hardware Installation

Core frequency = Ratio * External bus clock

JP4

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

JP5

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

JP6

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

JP3 & JP2 & JP1

1
2
3

1.5x (3.5x)

JP3 & JP2 & JP1

1
2
3

2.5x (1.75x)

JP3 & JP2 & JP1

1
2
3

4x

JP3 & JP2 & JP1

1
2
3

5x

CPU External Clock

60MHz
66MHz
75MHz

83.3MHz

JP3 & JP2 & JP1

1
2
3

2x

JP3 & JP2 & JP1

1
2
3

3x

JP3 & JP2 & JP1

1
2
3

4.5x

JP3 & JP2 & JP1

1
2
3

5.5x

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

2-7

Hardware Installation

1 2 3

1 2 3

1 2 3

1 2 3

JP4 & JP5 & JP6

JP6
JP5
JP4

60MHz

JP4 & JP5 & JP6

JP6
JP5
JP4

75MHz

JP4 & JP5 & JP6

JP6
JP5
JP4

66MHz

JP4 & JP5 & JP6

JP6
JP5
JP4

83.3Mz

Warning: INTEL TX chipset supports only
60/66MHz external CPU bus clock, the 75/83.3
MHz settings are for internal test only, set to
75/83.3MHz exceeds the specification of TX
chipset, which may cause serious system damage.

Caution: Following table are possible settings of
current CPU available on the market. The correct
setting may vary because of new CPU product,
refer to your CPU specification for more details.

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

INTEL
Pentium

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

CPU Core
Frequency

Ratio External

Bus Clock

JP1 & JP2 & JP3 JP4 & JP5 & JP6

2-8

Hardware Installation

INTEL
Pentium
MMX

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

Cyrix 6x86
& 6x86L

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

Cyrix M2 CPU Core

MX-PR166 150MHz = 2.5x 60MHz 2-3 & 2-3 & 1-2 1-2 & 2-3 & 1-2
MX-PR200 166MHz = 2.5x 66MHz 2-3 & 2-3 & 1-2 2-3 & 2-3 & 1-2
MX-PR233 200MHz = 3x 66MHz 1-2 & 2-3 & 1-2 2-3 & 2-3 & 1-2
MX-PR266 233MHz = 3.5x 66MHz 1-2 & 1-2 & 1-2 2-3 & 2-3 & 1-2

AMD K5 CPU Core

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

CPU Core
Frequency

CPU Core
Frequency

Frequency

Frequency

Ratio External

Bus Clock

Ratio External

Bus Clock

Ratio External

Bus Clock

Ratio External

Bus Clock

JP1 & JP2 & JP3 JP4 & JP5 & JP6

JP1 & JP2 & JP3 JP4 & JP5 & JP6

JP1 & JP2 & JP3 JP4 & JP5 & JP6

JP1 & JP2 & JP3 JP4 & JP5 & JP6

AMD K6 CPU Core

Frequency

PR2-166 166MHz = 2.5x 66MHz 2-3 & 2-3 & 1-2 2-3 & 2-3 & 1-2
PR2-200 200MHz = 3x 66MHz 1-2 & 2-3 & 1-2 2-3 & 2-3 & 1-2
PR2-233 233MHz = 3.5x 66MHz 1-2 & 1-2 & 1-2 2-3 & 2-3 & 1-2

Ratio External

Bus Clock

JP1 & JP2 & JP3 JP4 & JP5 & JP6

2-9