
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      64MB
Memory
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

[Image]

                                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            J28         Unidentified
      alter

      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

