Memory Installations
The following table shows several possible memory combinations. The P5TX-Bpro system board supports from 8-512MB. Memory can be installed in single DIMMs and supports EDO DRAM or SDRAM modules. All modules must use unbuffered 3.3 volt RAM. All EDO modules should be the same speed.

External Clock (MHz)

Bus Speed (MHz)

Jumper positions

50

25

11-13, 19-21, 20-22

55

27.5

11-13, 17-19, 20-22

60

30

9-11, 19-21, 20-22

66.6 (default)

33.3

11-13, 19-21,18-20

68.5

34.25

9-11, 17-19, 20-22

75

37.5

9-11, 17-19, 20-22

83.3

41.5

11-13, 17-19, 18-20

CPU Jumper Settings

Function

Jumper

Settings

External Speed

JP1

Internal Clock Factor

JP1

CPU Core Voltage (jumper is installed in only one position)

JP3

Connector

Function

Description

J1

PS/2 Mouse

Optional Mini-DIN PS/2 Mouse connection (not present if AT keyboard port installed)

J2

PS/2 Keyboard

Optional Mini-DIN PS/2 Keyboard connection (not present if AT keyboard port installed)

J3

AT Keyboard Port

Connects to AT (DIN-5) Keyboard

J4

PS/2 Mouse Port

Connects to PS/2 Mouse port bracket cable

J5

USB Ports

Connector for Universal Serial Bus 2-port bracket

J6

Primary IDE

40-pin connector connects to supplied 2-device cable. Primary Master, Slave

J7

Secondary IDE

40-pin connector connects to supplied 2-device cable. Secondary Master, Slave

J8

COM1 Port

Onboard 9-pin serial port. Can be configured as COM1/COM3

J9

COM2 Port

Onboard 9-pin serial port. Can be configured as COM2/COM4

J10

FIR header

Connects to optional Fast IR infrared module cable

J11

Intel IR header

Connects to optional IrDA or ASKIR Infrared module cable

J12

Parallel Port

25-pin parallel port supports enhanced modes

J13

Floppy Drive Controller

34 pin connector connects to 2-device cable;  End device is Drive A:, middle is Drive B:

J14

PS/1 Power

Connects to standard power supply leads P8 and P9

J16

Case features

Connections to front panel case features:

• Pins 2-3: "Power ON" LED
• Pins 4-5: Suspend switch
• Pins 9-10: Reset Switch
• Pins 11-15: Keyboard Lock
• Pins 17-20: Speaker

J18

Suspend Mode LED

Connects to case front panel Suspend Mode LED; LED blinking indicates low-power suspend mode is active

J19

Hard Disk LED

Connects to case front panel hard disk activity LED

J20

Case Fan power

For case-mounted cooling fan power cable (+12v)

J21

CPU Fan power

For CPU cooling fan power cable (+12v)

J22

Power Fan power

Connects to lead from "green" power supply with power management-enabled cooling fan