COMPAQ COMPUTER CORPORATION

DESKPRO 286 PORTABLE

Processor         80286
Processor Speed   8MHz
Chip Set          ETEQ
Max. Onboard DRAM 640KB
Cache             None
BIOS              Compaq
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                   Location     Purpose               Location

  Speaker                     J109       Floppy drive            J114
                                         power

  External battery            J110       Floppy drive            J115
                                         power

  Proprietary keyboard        J111       Main power              J116
  connector

  Monitor power               J112       Keylock                 J117

  Fixed drive power           J113       Onboard power LED       LED1

                        USER CONFIGURABLE SETTINGS

                 Function                      Jumper         Position

  »   Monitor type select Compaq                 ED          pins 2 & 3
      graphics/color                                           closed

      Monitor type select monochrome             ED          pins 1 & 2
      other than Compaq                                        closed

  »   Factory configured - do not alter          EM          pins 1 & 2
                                                               closed

  »   CPU speed select switchable at             ES          pins 1 & 2
      keyboard                                                 closed

      CPU speed select forced slow               ES          pins 2 & 3
                                                               closed

                            DRAM CONFIGURATION

    Size            Bank 0              Bank 1             Jumper MS

    256KB         (18) 4164           (18) 4164        pins 1 & 2 closed

    512KB            NONE             (18) 41256       pins 1 & 2 closed

    640KB         (18) 4164           (18) 41256       pins 2 & 3 closed

  Note: Boards that come from the manufacturer with 640KB installed have
  a different memory PAL chip installed than those that come with 256KB.
  This chip allows the user to disable bank 0 and use only bank 1, thus
  enabling the system to use older software that will not work on systems
  with more than 512KB.

                   BIOS (ROM SET 1) JUMPER CONFIGURATION

      ROM type          Size        Speed            Jumper block E

      Static           8K x 8       250ns        pins 10 & 11, 13 & 14,
                                                   and 16 & 17 closed

  »   Static          16K x 8       250ns        pins 10 & 11, 14 & 15,
                                                   and 16 & 17 closed

      Static          32K x 8       250ns        pins 11 & 12, 14 & 15,
                                                   and 16 & 17 closed

      Dynamic          8K x 8       150ns        pins 10 & 11, 13 & 14,
                                                   and 17 & 18 closed

      Dynamic         16K x 8       150ns        pins 10 & 11, 14 & 15,
                                                   and 17 & 18 closed

      Dynamic         32K x 8       150ns        pins 11 & 12, 14 & 15,
                                                   and 17 & 18 closed

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

  WARNING : Modifying the factory configurations will void the
  manufacturers warranty!

                      ROM SET 2 JUMPER CONFIGURATION

      ROM type          Size        Speed            Jumper block E

      Static           8K x 8       250ns       pins 4 & 5, 7 & 8, and 19
                                                      & 20 closed

      Static          16K x 8       250ns       pins 4 & 5, 8 & 9, and 19
                                                      & 20 closed

      Static          32K x 8       250ns       pins 5 & 6, 8 & 9, and 19
                                                      & 20 closed

      Dynamic          8K x 8       150ns       pins 4 & 5, 7 & 8, and 20
                                                      & 21 closed

      Dynamic         16K x 8       150ns       pins 4 & 5, 8 & 9, and 20
                                                      & 21 closed

  »   Dynamic         32K x 8       150ns       pins 5 & 6, 8 & 9, and 20
                                                      & 21 closed

  Note: Settings are accomplished by cutting the conductors on the bottom
  of the board and re-soldering the connections at the indicated
  locations

  WARNING : Modifying the factory configurations will void the
  manufacturers warranty!