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DECPC 400MT

DIGITAL EQUIPMENT CORPORATION

DECPC 400MT

Processor

80486DX/80486DX2

Processor Speed

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

Chip Set

Unidentified

Video Chip Set

Unidentified

Maximum Onboard Memory

64MB

Maximum Video Memory

1MB

Cache

None

BIOS

Unidentified

Dimensions

254mm x 218mm

I/O Options

CPU slot, parallel port, PS/2 mouse port, serial ports (2), VGA port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Parallel port

CN1

PS/2 mouse port

CN5

VGA port

CN2

External battery

JP1

Serial port 2

CN3

CPU slot

SL1

Serial port 1

CN4

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

VGA IRQ9 disabled

J13

Open

 

VGA IRQ9 enabled

J13

Closed

On board video enabled

J14

Closed

 

On board video disabled

J14

Open

Local enabled

J23

Pins 1 & 2 closed

 

Local & ISA enabled

J23

Pins 2 & 3 closed

Parallel port unidirectional

J25

Pins 1 & 2 closed

 

Parallel port bidirectional

J25

Pins 2 & 3 closed

Reset switch enabled

J27

Pins 1 & 2 closed

 

Reset switch disabled

J27

Pins 2 & 3 closed

Factory configured - do not alter

J28

Unidentified

 

Monitor type select color

J29

Closed

 

Monitor type select monochrome

J29

Open

CMOS memory normal operation

J31

Pins 1 & 2 closed

 

CMOS memory clear

J31

Pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB

(1) 1M x 36

None

None

None

8MB

(1) 1M x 36

(1) 1M x 36

None

None

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

None

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

None

None

None

20MB

(1) 1M x 36

(1) 4M x 36

None

None

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

None

32MB

(1) 4M x 36

(1) 4M x 36

None

None

40MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

None

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

Note: The location of banks 0, 1, 2 & 3 are unidentified.

VIDEO MEMORY CONFIGURATION

Size

Bank 0

Bank 1

512KB

512KB

None

1MB

512KB

512KB

Note: The location of banks 0 & 1 are unidentified.

VIDEO MEMORY JUMPER CONFIGURATION

Size

J22

512KB

Pins 1 & 2 closed

1MB

Pins 2 & 3 closed