AOpen P5TC-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

2.1 Jumpers and Connector Locations

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

I
S
A

3

HDD LED

PANEL

USB

KB1

PS2 MS

P
C
I
4

SB-LINK

BIOS

P
C
I

3

IrDA

PWR1

P

P

C

C

I

I

1

2

IDE1

I

I

S

S

A

A

2

1

FDC

IDE2

COM2

COM1

S

I
M
M

1

PRINTER

D

D

I

I

S

S

S

I

I

M

M

M

M

M

M

3

2

M

M

I

M

M

2

1

4

PiiX4

SW1

JP14

TX

JP4

FAN

JP12

JP5
JP6

2-2

Hardware Installation

Jumpers

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

Connectors

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

2-3

Hardware Installation

3

3

2.2 Jumpers

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

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

Open

1
2

Short

1
2

Jumper set at 1-2

1
2

Jumper set at 2-3

1
2

2-4

2.2.1 Setting the CPU Voltage

ON

ON

ON

ON

ON

ON

S4

ON
OFF
OFF
ON
OFF
OFF
OFF

S5

ON
ON
OFF
OFF
OFF
ON
ON

S6

ON
ON
ON
OFF
OFF
OFF
OFF

S7

ON
ON
ON
ON
ON
OFF

ON

S8

OFF
OFF
OFF
OFF
OFF
OFF
ON

Vcore

3.52V

3.45V

3.2V

2.9V

2.8V

2.2V

1.8V

Hardware Installation

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

1 2 3 4 5 6 7 8

2.9V

K6-166/200 or M2

1 2 3 4 5 6 7 8

2.8V

Intel P55C (MMX)

1 2 3 4 5 6 7 8

3.52V

Cyrix 6x86 or AMD K5

1 2 3 4 5 6 7 8

3.45V

Intel P54C or IDT C6

1 2 3 4 5 6 7 8

3.2V

AMD K6-233

ON

1 2 3 4 5 6 7 8

2.2V

K6-266/300

1 2 3 4 5 6 7 8

1.8V

Reserved for future use

2-5

Hardware Installation

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

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

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

CPU Type S4 S5 S6 S7 S8 Vcore

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

2-6

Hardware Installation

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

Vcore

1.30V

1.35V

1.40V

1.45V

1.50V

1.55V

1.60V

1.65V

1.70V

1.75V

1.80V

1.85V

1.90V

1.95V

2.00V

2.05V

2.0V

2.1V

2.2V

2.3V

2.4V

2.5V

2.6V

2.7V

2.8V

2.9V

3.0V

3.1V

3.2V

3.3V

3.4V

3.5V

S4

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

S5

OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON

S6

OFF
OFF
OFF
OFF

ON
ON
ON

ON
OFF
OFF
OFF
OFF

ON

ON

ON

ON
OFF
OFF
OFF
OFF

ON

ON

ON

ON
OFF
OFF
OFF
OFF

ON

ON

ON

ON

S7

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

ON
ON
ON
ON
ON
ON
ON

ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

ON

ON

ON

ON

ON

ON

ON

ON

S8

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

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

2-7

Hardware Installation

JP12

1-2
3-4

I/O Voltage (Vio)

3.3 (default)

3.45V

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

JP12

1 2 3

3.3V

(default)

JP12

1 2 3

3.45V

2.2.2 Selecting the CPU Frequency

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

Core frequency = Ratio * External bus clock

2-8

S1

OFF
ON
ON
OFF
ON
ON
OFF

S2

OFF
OFF
ON
ON
OFF
ON
ON

S3

OFF
OFF
OFF
OFF
ON
ON
ON

CPU Frequency
Ratio

1.5x (3.5x)
2x

2.5x (1.75x)
3x
4x

4.5x

5x

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

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

Hardware Installation

ON

ON

ON

ON

ON

ON

ON

JP4

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

JP5

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

1 2 3 4 5 6 7 8

1.5x (3.5x)

1 2 3 4 5 6 7 8

2x

1 2 3 4 5 6 7 8

2.5x (1.75x)

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

4x

1 2 3 4 5 6 7 8

4.5x

1 2 3 4 5 6 7 8

5x

3x

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

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

1.75x frequency ratio.

JP6

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

CPU External Clock

60MHz
66MHz
75MHz

83.3MHz

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

JP4 JP5 JP6

1 2 3 1 2 3 1 2 3

60MHz

JP4 JP5 JP6

1 2 3 1 2 3 1 2 3

75MHz

JP4 JP5 JP6

1 2 3 1 2 3 1 2 3

66MHz

JP4 JP5 JP6

1 2 3 1 2 3 1 2 3

83.3mhz

2-9