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DRS M50/M55

ICL

DRS M50/M55

Processor

80386SX

Processor Speed

16/20MHz

Chip Set

Unidentified

Max. Onboard DRAM

8MB

Cache

None

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

Floppy drive interface, IDE interface, parallel port, serial ports (2), VGA port, riser slot

NPU Options

80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

CN1

Serial port 1

P1

LED’s & security lock

CN2

Parallel port

P2

Keyboard/mouse connector

CN3

Serial port 2

P3

IDE interface

JP1

VGA port (on VGA board)

P4

Floppy drive interface

JP2

Riser slot

SL1

USER CONFIGURABLE SETTINGS (MAINBOARD)

Function

Jumper

Position

 

Password enabled

J3

Pins 1 & 2 closed

 

Password disabled

J3

Pins 2 & 3 closed

 

Security lock enabled

J9

Open

 

Security lock disabled

J9

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

2MB

(2) 1M x 9

None

None

None

4MB

(2) 1M x 9

(2) 1M x 9

None

None

8MB

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

CPU SPEED CONFIGURATION

Speed

J4

J5

16MHz

Pins 2 & 3 closed

Pins 2 & 3 closed

20MHz

Pins 1 & 2 closed

Pins 1 & 2 closed

USER CONFIGURABLE SETTINGS (VGA BOARD)

Function

Jumper

Position

»

On board video enabled

J1

Closed

 

On board video disabled

J1

Open

»

VGA IRQ9 enabled

J4

Closed

 

VGA IRQ9 disabled

J4

Open

»

VGA BIOS enabled

SW1

Pins 1 & 2 closed

 

VGA BIOS disabled

SW1

Pins 2 & 3 closed