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