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P55-TX

EPOX COMPUTER CO., LTD.

P55-TX

Processor

CX 6X86/AM K5/AM K6/Pentium

Processor Speed

90/100/120/133/150/166/180/200/225/233MHz

Chip Set

Intel

Video Chip Set

None

Maximum Onboard Memory

256MB (EDO supported)

Maximum Video Memory

None

Cache

512KB

BIOS

Award

Dimensions

305mm x 244mm

I/O Options

32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), IR connector, USB connector, ATX power connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

ATX power connector

ATX

Chassis fan power

JP1

USB connector

CN1

Soft off power supply

JP9

Serial port 2

CN2

Power LED & keylock

JP14/pins 1 5

Parallel port

CN3

Speaker

JP14/pins 7 - 10

PS/2 mouse port

CN4

Reset switch

JP14/pins 12 & 13

Serial port 1

CN5

Green PC connector

JP14/pins 15 & 16

IR connector

J4

Green PC LED

JP14/pins 18 & 19

IDE interface 1

J5

Turbo LED

JP14/pins 20 & 21

IDE interface 2

J6

IDE interface LED

JP14/pins 23 & 24

Floppy drive interface

J7

32-bit PCI bus slots

PC1 PC4

USER CONFIGURABLE SETTINGS

Function

Label

Position

Keyboard power on enabled

JP2

Pins 1 & 2 closed

 

Keyboard power on disabled

JP2

Pins 2 & 3 closed

Factory configured - do not alter

JP6

Unidentified

CMOS memory normal operation

JP8

Pins 1 & 2 closed

 

CMOS memory clear

JP8

Pins 2 & 3 closed

SIMM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(2) 1M x 36

None

16MB

(2) 2M x 36

None

16MB

(2) 1M x 36

(2) 1M x 36

24MB

(2) 2M x 36

(2) 1M x 36

32MB

(2) 4M x 36

None

32MB

(2) 2M x 36

(2) 2M x 36

40MB

(2) 4M x 36

(2) 1M x 36

48MB

(2) 4M x 36

(2) 2M x 36

64MB

(2) 8M x 36

None

64MB

(2) 4M x 36

(2) 4M x 36

72MB

(2) 8M x 36

(2) 1M x 36

80MB

(2) 8M x 36

(2) 2M x 36

96MB

(2) 8M x 36

(2) 4M x 36

128MB

(2) 8M x 36

(2) 8M x 36

128MB

(2) 16M x 36

None

136MB

(2) 16M x 36

(2) 1M x 36

144MB

(2) 16M x 36

(2) 2M x 36

160MB

(2) 16M x 36

(2) 4M x 36

192MB

(2) 16M x 36

(2) 8M x 36

256MB

(2) 16M x 36

(2) 16M x 36

Note: Board accepts EDO memory.

DIMM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(1) 1M x 64

None

16MB

(1) 2M x 64

None

16MB

(1) 1M x 64

(1) 1M x 64

24MB

(1) 2M x 64

(1) 1M x 64

32MB

(1) 4M x 64

None

32MB

(1) 2M x 64

(1) 2M x 64

40MB

(1) 4M x 64

(1) 1M x 64

48MB

(1) 4M x 64

(1) 2M x 64

64MB

(1) 8M x 64

None

64MB

(1) 4M x 64

(1) 4M x 64

72MB

(1) 8M x 64

(1) 1M x 64

80MB

(1) 8M x 64

(1) 2M x 64

96MB

(1) 8M x 64

(1) 4M x 64

128MB

(1) 8M x 64

(1) 8M x 64

DIMM/SIMM VOLTAGE CONFIGURATION

Voltage

JP7A

JP7B

3.3v

Pins 2 & 3 closed

Pins 2 & 3 closed

 

5v

Pins 1 & 2 closed

Pins 1 & 2 closed

CACHE CONFIGURATION

Size

Bank 0

TAG

512KB

(2) 64K x 32

Unidentified

Note: The location of the TAG is unidentified.

CPU SPEED SELECTION (CX 6X86)

CPU speed

Clock speed

Multiplier

JP4

133MHz

66MHz

2x

Pins 23 & 24 closed

150MHz

60MHz

2x

Pins 5 & 6 closed

166MHz

66MHz

2x

Pins 7 & 8 closed

200MHz

66MHz

2x

Pins 25 & 26 closed

CPU SPEED SELECTION (AM K5/K6)

CPU speed

Clock speed

Multiplier

JP4

90MHz

60MHz

1.5x

Pins 1 & 2 closed

100MHz

66MHz

1.5x

Pins 3 & 4 closed

120MHz

60MHz

2x

Pins 5 & 6 closed

133MHz

66MHz

2x

Pins 7 & 8 closed

150MHz

60MHz

2.5x

Pins 9 & 10 closed

166MHz

66MHz

2.5x

Pins 11 & 12 closed

180MHz

60MHz

3x

Pins 13 & 14 closed

200MHz

66MHz

3x

Pins 15 & 16 closed

225MHz

75MHz

3.5x

Pins 17 & 18 closed

CPU SPEED SELECTION (INTEL)

CPU speed

Clock speed

Multiplier

JP4

90MHz

60MHz

1.5x

Pins 1 & 2 closed

100MHz

66MHz

1.5x

Pins 3 & 4 closed

120MHz

60MHz

2x

Pins 5 & 6 closed

133MHz

66MHz

2x

Pins 7 & 8 closed

150MHz

60MHz

2.5x

Pins 9 & 10 closed

166MHz

66MHz

2.5x

Pins 11 & 12 closed

180MHz

60MHz

3x

Pins 13 & 14 closed

200MHz

66MHz

3x

Pins 15 & 16 closed

225MHz

75MHz

3.5x

Pins 17 & 18 closed

CPU VOLTAGE SELECTION (SINGLE)

Voltage

J16

 

3.3v

Pins 1 & 2 closed

 

3.45v

Pins 2 & 3 closed

3.52v

Pins 3 & 4 closed

CPU VOLTAGE SELECTION (DUAL)

Voltage

V core

J16

J18

 

3.3v

2.5v

Pins 1 & 2 closed

Pins 1 & 2 closed

 

3.3v

2.8v

Pins 1 & 2 closed

Pins 2 & 3 closed

 

3.3v

2.9v

Pins 1 & 2 closed

Open

 

3.45v

2.5v

Pins 2 & 3 closed

Pins 1 & 2 closed

 

3.45v

2.8v

Pins 2 & 3 closed

Pins 2 & 3 closed

 

3.45v

2.9v

Pins 2 & 3 closed

Open

 

3.52v

2.5v

Pins 3 & 4 closed

Pins 1 & 2 closed

3.52v

2.8v

Pins 3 & 4 closed

Pins 2 & 3 closed

 

3.52v

2.9v

Pins 3 & 4 closed

Open

FLASH BIOS SELECTION

Setting

J9

J10

5v

Pins 2 & 3 closed

Pins 2 & 3 closed

 

12v

Pins 1 & 2 closed

Pins 1 & 2 closed