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P55-TH

EPOX COMPUTER CO., LTD.

P55-TH

Processor

CX M1/Pentium

Processor Speed

75/90/100/120/133/150/166/180/200MHz

Chip Set

Intel

Video Chip Set

None

Maximum Onboard Memory

512MB (EDO supported)

Maximum Video Memory

None

Cache

256/512KB

BIOS

Award

Dimensions

330mm x 218mm

I/O Options

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

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 1

CN1

Green PC LED

J6

Serial port 2

CN2

Chassis fan power

J7

Parallel port

CN3

PS/2 mouse interface

J10

Floppy drive interface

CN4

IR connector

J33

IDE interface 2

CN5

Turbo switch

J44

IDE interface 1

CN6

IDE interface LED

JP5

Power LED & keylock

J1

Green PC connector

JP14

Speaker

J2

32-bit PCI slots

PC1 - PC4

Reset switch

J3

Cache slot

SL1

USER CONFIGURABLE SETTINGS

Function

Label

Position

SMC chip enabled

J24

Open

 

SMC chip disabled

J24

Closed

 

Flash BIOS voltage select 12v

JP6

Pins 2 & 3 closed

 

Flash BIOS voltage select 5v

JP6

Pins 1 & 2 closed

Flash BIOS normal operation

JP8

Pins 1 & 2 closed

 

Flash BIOS boot block enabled

JP8

Pins 2 & 3 closed

Factory configured - do not alter

JP12

Unidentified

Clock rate set as AT CLOCK

JP15

Pins 1 & 2 closed

 

Clock rate set as 12MHz

JP15

Pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(2) 1M x 36

None

16MB

(2) 1M x 36

(2) 1M x 36

16MB

(2) 2M x 36

None

24MB

(2) 2M x 36

(2) 1M x 36

32MB

(2) 2M x 36

(2) 2M x 36

32MB

(2) 4M x 36

None

40MB

(2) 4M x 36

(2) 1M x 36

48MB

(2) 2M x 36

(2) 4M x 36

64MB

(2) 4M x 36

(2) 4M x 36

64MB

(2) 8M x 36

None

72MB

(2) 8M x 36

(2) 1M x 36

80MB

(2) 8M x 36

(2) 2M x 36

96MB

(2) 4M x 36

(2) 8M x 36

96MB

(2) 8M x 36

(2) 4M x 36

128MB

(2) 8M x 36

(2) 8M x 36

256MB

(2) 16M x 36

(2) 16M x 36

512MB

(2) 32M x 36

(2) 32M x 36

Note: Board accepts EDO memory. Board also accepts x 32 SIMMs. Banks are interchangeable.

CACHE CONFIGURATION

Size

Bank 0

TAG

SL1

256KB (A)

(2) 32K x 32

(1) 32K x 8

Not installed

256KB (B)

None

None

256KB module installed

512KB (A)

(2) 32K x 32

(1) 32K x 8

256KB module installed

512KB (B)

(2) 64K x 32

(1) 32K x 8

Not installed

512KB (C)

None

None

512KB module installed

CACHE JUMPER CONFIGURATION

Size

JP10

JP11

256KB (A)

Pins 1 & 2 closed

Pins 1 & 2 closed

256KB (B)

Pins 1 & 2 closed

Pins 2 & 3 closed

512KB (A)

Pins 1 & 2 closed

Pins 1 & 2 closed

512KB (B)

Pins 2 & 3 closed

Pins 1 & 2 closed

512KB (C)

Pins 1 & 2 closed

Pins 2 & 3 closed

CPU SPEED SELECTION (CYRIX)

CPU speed

Clock speed

JP1

100MHz

66MHz

Pins 10 & 23 closed

120MHz

60MHz

Pins 4 & 17 closed

133MHz

66MHz

Pins 5 & 18 closed

CPU SPEED SELECTION (INTEL)

CPU speed

Clock speed

JP1

75MHz

50MHz

Pins 1 & 14 closed

90MHz

60MHz

Pins 2 & 15 closed

100MHz

66MHz

Pins 3 & 16 closed

120MHz

60MHz

Pins 4 & 17 closed

133MHz

66MHz

Pins 5 & 18 closed

150MHz

60MHz

Pins 6 & 19 closed

166MHz

66MHz

Pins 7 & 20 closed

180MHz

60MHz

Pins 8 & 21 closed

200MHz

66MHz

Pins 9 & 22 closed

CPU TYPE SELECTION

Type

JP3A

JP3B

JP3C

JP3D

CX M1

1 & 2

1 & 2

1 & 2

1 & 2

P54C/P54CS/P54CT/P54CTB

1 & 2

1 & 2

1 & 2

1 & 2

P55C

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU AT BUS CLOCK SELECTION

Setting

J25

PCICLK/4

Pins 2 & 3 closed

 

PCICLK/3

Pins 1 & 2 closed