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Processor

80486SX/80486SX2/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive

Processor Speed

25/33/50(internal)/66(internal)MHz

Chip Set

Compaq

Max. Onboard DRAM

64MB

Cache

128KB (on external cache card)

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

External cache card slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial port, VGA feature connector, VGA port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port

CN1

IDE interface

CN6

PS/2 mouse port

CN2

VGA feature connector

CN7

Parallel port

CN3

External battery

J17

VGA port

CN4

Speaker

P11

Floppy drive interface

CN5

External cache card slot

SL1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

�

Pentium Overdrive mode select write back

P1

Pins 2 & 3 closed

Pentium Overdrive mode select write through

P1

Pins 1 & 2 closed

�

On board video enabled

P5

Pins 2 & 3 closed

On board video disabled

P5

Pins 1 & 2 closed

�

Parallel port IRQ select IRQ7

P8

Pins 1 & 2 closed

Parallel port IRQ select IRQ5

P8

Pins 2 & 3 closed

�

CMOS memory normal operation

P9

Closed

CMOS memory clear

P9

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB

(1) 1M x 36

NONE

NONE

NONE

5MB

(1) 1M x 36

(1) 256K x 36

NONE

NONE

6MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

NONE

7MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

9MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

NONE

10MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

13MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

20MB

(1) 1M x 36

(1) 4M x 36

NONE

NONE

21MB

(1) 1M x 36

(1) 4M x 36

(1) 256K x 36

NONE

22MB

(1) 1M x 36

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

24MB

(1) 1M x 36

(1) 4M x 36

(1) 1M x 36

NONE

25MB

(1) 1M x 36

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

28MB

(1) 1M x 36

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

36MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

NONE

36MB

(1) 1M x 36

(1) 8M x 36

NONE

NONE

37MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

37MB

(1) 1M x 36

(1) 8M x 36

(1) 256K x 36

NONE

38MB

(1) 1M x 36

(1) 8M x 36

(1) 256K x 36

(1) 256K x 36

40MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

40MB

(1) 1M x 36

(1) 8M x 36

(1) 1M x 36

NONE

41MB

(1) 1M x 36

(1) 8M x 36

(1) 1M x 36

(1) 256K x 36

44MB

(1) 1M x 36

(1) 8M x 36

(1) 1M x 36

(1) 1M x 36

52MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

52MB

(1) 1M x 36

(1) 8M x 36

(1) 4M x 36

NONE

53MB

(1) 1M x 36

(1) 8M x 36

(1) 4M x 36

(1) 256K x 36

56MB

(1) 1M x 36

(1) 8M x 36

(1) 4M x 36

(1) 1M x 36

64MB

(1) 1M x 36

(1) 8M x 36

(1) 4M x 36

(1) 4M x 36

Note: When 64MB of memory is installed, Bank 0 is ignored. Do not remove the 1M x 36 from Bank 0.

CPU TYPE CONFIGURATION

Type

P2

P3

P4

P6

P7

80486SX-25

1 & 2

1 & 2

3 & 4

1 & 2

1 & 2

80486SX-33

1 & 2

1 & 2

3 & 4

1 & 2

2 & 3

80487SX-25

1 & 2

1 & 2

3 & 4

1 & 2

1 & 2

80486DX-25

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

80486DX-33

2 & 3

2 & 3

1 & 2

1 & 2

2 & 3

80486SX2-66

2 & 3

2 & 3

1 & 2

1 & 2

2 & 3

80486DX2-50

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

80486DX2-66

2 & 3

2 & 3

1 & 2

1 & 2

2 & 3

ODP

2 & 3

2 & 3

2 & 3

1 & 2

N/A

ODPR

2 & 3

2 & 3

1 & 2

1 & 2

N/A

Pentium ODP

2 & 3

2 & 3

2 & 3

2 & 3

N/A

CPU SPEED CONFIGURATION

Speed

P7

25MHz

Pins 1 & 2 closed

33MHz

Pins 2 & 3 closed

50iMHz

Pins 1 & 2 closed

66iMHz

Pins 2 & 3 closed