COMPAQ COMPUTER CORPORATION

DESKPRO 286 (VERSION 2)

Processor         80286
Processor Speed   8MHz
Chip Set          ETEQ
Max. Onboard DRAM 2.125MB
Cache             None
BIOS              Compaq
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  Fixed drive power         J109       Proprietary               J116
                                       keyboard connector

  Fixed drive/Tape          J110       Main power                J117
  backup power

  Floppy drive power        J111       External battery          J118

  Floppy drive power        J112       Keylock                   J119

  Monitor power             J113       Onboard power LED         LED1

  Speaker                   J115

                        USER CONFIGURABLE SETTINGS

                Function                     Switch          Position

  »   CPU speed select switchable at          SW1/6             Off
      keyboard

      CPU speed select forced slow            SW1/6             On

  »   Factory configured - do not alter       SW1/7             Off

  »   Monitor type select color               SW1/8             On

      Monitor type select monochrome          SW1/8             Off

                            DRAM CONFIGURATION

    Size      Bank 0    P-0      Bank 1     Bank 2    Bank 3     Bank 4

   256KB       (4)       (2)      (18)       NONE      NONE       NONE
              4464      4164      4164

   512KB       (4)       (2)      (18)       (18)       (18)      NONE
              4464      4164      4164       4164      4164

   640KB       (4)       (2)      (18)       (18)       (18)    (18) 4164
              4464      4164      4164       4164      4164

   640KB       (4)       (2)      (18)       NONE      NONE       NONE
              4464      4164     41256

  1.125MB      (4)       (2)      (18)       (18)      NONE       NONE
              4464      4164     41256      41256

  1.625MB      (4)       (2)      (18)       (18)       (18)      NONE
              4464      4164     41256      41256      41256

  2.125MB      (4)       (2)      (18)       (18)       (18)       (18)
              4464      4164     41256      41256      41256      41256

                         DRAM JUMPER CONFIGURATION

     Size        SW1/1       SW1/2       SW1/3       SW1/4        SW1/5

   Disabled       N/A         On           On         N/A          N/A

    256KB         On          On          Off         Off          Off

    512KB         On          Off          On         Off          Off

    640KB         On          Off         Off         Off          Off

    640KB         Off         Off         Off          On          On

   1.125MB        Off         Off         Off          On          Off

   1.625MB        Off         Off         Off         Off          On

   2.125MB        Off         Off         Off         Off          Off

  Notes:Closing both SW1/switch 2 and SW1/switch 3, disables banks 0 & 1
  and any onboard ROM.

  Jumper configurations correlate directly to DRAM configurations.

                         ROM JUMPER CONFIGURATION

   ROM type     Size      Speed      BIOS ROM/Jumper     ROM set 2/Jumper
                                        block E1            block E2

  Static        8K x 8    250ns    pins 1&2, 4&5, and     pins 1&2, 4&5,
                                       7&8 closed        and 7&8 closed

  1Static       16K x     250ns    pins 2&3, 4&5, and     pins 2&3, 4&5,
                  8                    7&8 closed        and 7&8 closed

  Static        32K x     250ns    pins 2&3, 5&6, and     pins 2&3, 5&6,
                  8                    7&8 closed        and 7&8 closed

  Dynamic       8K x 8    150ns    pins 1&2, 4&5, and     pins 1&2, 4&5,
                                       8&9 closed        and 8&9 closed

  Dynamic       16K x     150ns    pins 2&3, 4&5, and     pins 2&3, 4&5,
                  8                    8&9 closed        and 8&9 closed

  2Dynamic      32K x     150ns    pins 2&3, 5&6, and     pins 2&3, 5&6,
                  8                    8&9 closed        and 8&9 closed

  Notes:Settings are accomplished by cutting the conductors on the bottom
  of the board and re-soldering

  the indicated locations.

  1) Default for BIOS ROM

  2) Default for ROM set 2

  WARNING : Modifying the factory configurations will void the
  manufacturer's warranty!