
COMPAQ COMPUTER CORPORATION

DESKPRO 286 (VERSION 1)

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

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                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  Keyboard power fuse        F1        Speaker                   J115

  Monitor power fuse         F2        Proprietary keyboard      J116
                                       plug

  Fixed drive power         J109       Main power                J117

  Fixed drive/tape          J110       External battery          J118
  backup power

  Floppy drive power        J111       Keylock                   J119

  Floppy drive power        J112       Onboard power LED         LED1

  Monitor power             J113

                        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

SYSTEM MEMORY CARD (VERSION 1)

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                         ROM JUMPER CONFIGURATION

   ROM type      Size      Speed    BIOS ROM / Jumper      ROM set 2 /
                                         block E         Jumper block E

  Static         8K x 8    250ns     pins 7&8, 10&11,     pins 1&2, 4&5,
                                      13&14 closed        22&23 closed

  1 Static       16K x     250ns     pins 8&9, 10&11,     pins 2&3, 4&5,
                   8                  13&14 closed        22&23 closed

  Static         32K x     250ns     pins 8&9, 11&12,     pins 2&3, 5&6,
                   8                  13&14 closed        22&23 closed

  Dynamic        8K x 8    150ns     pins 7&8, 10&11,     pins 1&2, 4&5,
                                      14&15 closed        20&21 closed

  Dynamic        16K x     150ns     pins 8&9, 10&11,     pins 2&3, 4&5,
                   8                  14&15 closed        20&21 closed

  2Dynamic       32K x     150ns     pins 8&9, 11&12,     pins 2&3, 5&6,
                   8                  14&15 closed        20&21 closed

  Note: 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
  manufacturers warranty!

                            DRAM CONFIGURATION

    Size       Bank 0      Bank 1      Bank 2       Bank 3       Bank 4

    256KB      (2) 64K    (18) 4164     NONE         NONE         NONE
                 x 9

    512KB      (2) 64K    (18) 4164   (18) 4164    (18) 4164      NONE
                 x 9

    640KB      (2) 64K    (18) 4164   (18) 4164    (18) 4164   (18) 4164
                 x 9

    640KB      (2) 64K      (18)        NONE         NONE         NONE
                 x 9       41256

   1.125MB     (2) 64K      (18)         (18)        NONE         NONE
                 x 9       41256        41256

   1.625MB     (2) 64K      (18)         (18)        (18)         NONE
                 x 9       41256        41256       41256

   2.125MB     (2) 64K      (18)         (18)        (18)      (18) 41256
                 x 9       41256        41256       41256

  Note: Bank 0is permanently affixed to the memory board and is not
  alterable.

                  DRAM JUMPER CONFIGURATION

        Size                  E1                  E2

        256KB          pins 1 & 2 closed   pins 2 & 3 closed

        512KB          pins 1 & 2 closed   pins 1 & 2 closed

        640KB          pins 1 & 2 closed   pins 2 & 3 closed

        640KB          pins 2 & 3 closed   pins 1 & 2 closed

       1.125MB         pins 2 & 3 closed   pins 2 & 3 closed

       1.625MB         pins 2 & 3 closed   pins 2 & 3 closed

       2.125MB         pins 2 & 3 closed   pins 2 & 3 closed

SYSTEM MEMORY CARD (VERSIONS 2 & 3)

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Note: Versions 2 & 3 are differentiated by

Their assembly numbers

Version 2 has assembly #'s 000178-XXX

Version 3 has assembly #'s 000382-XXX

                            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

  Notes: Version 3 of the system memory board does not support the second
  640KB configuration using (18) 41256 chips in bank 1.

  Bank 0 is permanently affixed to the memory board and is not alterable.

                         DRAM JUMPER CONFIGURATION

     Size              Version 2 E1                  Version 3 E1

    256KB       pins 1 & 2 and 4 & 5 closed   pins 2 & 3 and 4 & 5 closed

    512KB       pins 1 & 2 and 4 & 5 closed   pins 1 & 2 and 4 & 5 closed

    640KB       pins 1 & 2 and 5 & 6 closed   pins 1 & 2 and 5 & 6 closed

    640KB       pins 2 & 3 and 4 & 5 closed               N/A

   1.125MB      pins 2 & 3 and 5 & 6 closed   pins 2 & 3 and 5 & 6 closed

   1.625MB      pins 2 & 3 and 5 & 6 closed   pins 2 & 3 and 5 & 6 closed

   2.125MB      pins 2 & 3 and 5 & 6 closed   pins 2 & 3 and 5 & 6 closed

                         ROM JUMPER CONFIGURATION

   ROM type      Size     Speed      BIOS ROM/Jumper     ROM set 2/Jumper
                                        Block E2            Block E3

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

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

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

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

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

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

