
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

[Image]

                                CONNECTIONS

  Purpose                    Location    Purpose                Location

  Reset switch                  CN1      Serial port 1             P1

  LEDs & security lock         CN2      Parallel port             P2

  Keyboard/mouse connector      CN3      Serial port 2             P3

  IDE interface                 JP1      VGA port (on VGA          P4
                                         board)

  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

