AOpen AP5T-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 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

JP6

PWR1

COM2

JP3

JP4

JP1

2.1 Jumper and Connector Locations

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

S
A

3

BIO

USB

I

I

S

A

A

2

KBC

I
S

1

PCI
4

PCI
3

PiiX4

PCI
2

Super
I/O

PCI
1

FDC

IDE1

IDE2

S

S

I

I

M

M

M

M

1

2

PS2 MS

S

I
M
M

3

S

I
M
M

4

KB1

COM1

PRINTER

D

D

I

I

M

M

M

M

2

1

TX

JP14
JP18

S

JP11

JP20

FAN

HDD LED

IrDA

PANEL

JP2

JP5

2-2

Hardware Installation

Jumpers:

JP1,JP2,JP3: CPU frequency ratio
JP4,JP5,JP6: CPU external (bus) clock
JP11: CPU core voltage setting (Vcore)
JP14: Clear CMOS
JP18: Onboard Super I/O enable/disable
JP20: Onboard PS/2 mouse enable/disable

Connectors:

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

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

12

11

12

11

12

11

12

11

12

Hardware Installation

JP11

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

CPU Core Voltage (Vcore)

3.45V (Intel P54C or IDT C6)

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

IDT C6

JP11

1

2

3

4

5

6

7

8

9

10

3.52V

6x86 or

K5

JP11

1

2
4
6
8

10

2

3

4

5

6

7

8

9

10

2.9V

K6-166
K6-200

JP11

1
3
5
7
9

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 from above CPU
type. It is recommended to adopt larger fan on these CPU for
better air flow in the system. Please refer to AOpen 's web site
(http://www.aopen.com.tw) to choose a proper CPU fan.

JP11

1

2
4
6
8

10

2

3

4

5

6

7

8

9

10

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

INTEL P54C Single Voltage 1-2 3.45V
INTEL MMX

P55C
AMD K5 Single Voltage 3-4 3.52V
AMD K6-166/200 Dual Voltage 5-6 2.9V
AMD K6-233 Dual Voltage 9-10 3.2V
Cyrix 6x86 Single Voltage 3-4 3.52V
Cyrix 6x86L Dual Voltage 7-8 2.8V
Cyrix M2 Dual Voltage 5-6 2.9V
IDT C6 Single Voltage 1-2 3.45V

2.2.2 Selecting the CPU Frequency

Dual Voltage 7-8 2.8V

JP3

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

JP1

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

JP2

1-2
1-2
2-3
2-3
1-2
2-3
2-3
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 by
JP1, 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.

Core frequency = Ratio * External bus clock

2-6

Hardware Installation

JP6

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

JP4

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

JP3 JP1 JP2

1 2 3 1 2 3 1 2 3

1.5x (3.5x)

JP3 JP1 JP2

1 2 3 1 2 3 1 2 3

2.5x (1.75x)

JP3 JP1 JP2

1 2 3 1 2 3 1 2 3

4x

JP3 JP1 JP2

1 2 3 1 2 3 1 2 3

5x

JP3 JP1 JP2

1 2 3 1 2 3 1 2 3

2x

JP3 JP1 JP2

1 2 3 1 2 3 1 2 3

3x

JP3 JP1 JP2

1 2 3 1 2 3 1 2 3

4.5x

JP3 JP1 JP2

1 2 3 1 2 3 1 2 3

5.5x

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

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

1.75x frequency ratio.

JP5

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

CPU External Clock

60MHz
66MHz
75MHz

83.3MHz

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

2-7

Hardware Installation

JP6 JP4 JP5

1 2 3 1 2 3 1 2 3

60MHz

JP6 JP4 JP5

1 2 3 1 2 3 1 2 3

75MHz

JP6 JP4 JP5

1 2 3 1 2 3 1 2 3

66MHz

JP6 JP4 JP5

1 2 3 1 2 3 1 2 3

83.3MHz

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

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

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

INTEL
Pentium

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

CPU Core
Frequency

Ratio External

Bus Clock

JP3 & JP1 & JP2 JP6 & JP4 & JP5

2-8

Hardware Installation

INTEL
Pentium

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

Cyrix 6x86
& 6x86L

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

Cyrix M2 CPU Core

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

AMD K5 CPU Core

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

JP3 & JP1 & JP2 JP6 & JP4 & JP5

JP3 & JP1 & JP2 JP6 & JP4 & JP5

JP3 & JP1 & JP2 JP6 & JP4 & JP5

JP3 & JP1 & JP2 JP6 & JP4 & JP5

AMD K6 CPU Core

Frequency

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

IDT C6 CPU Core

Frequency

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

Ratio External

Bus Clock

Ratio External

Bus Clock

JP3 & JP1 & JP2 JP6 & JP4 & JP5

JP3 & JP1 & JP2 JP6 & JP4 & JP5

2-9