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

  LED’s & 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