COMPAQ COMPUTER CORPORATION

Portable (PLUS) (Model 00004-Rev. C or earlier)

Processor         8088
Processor Speed   4.77MHz
Chip Set          None
Max. Onboard DRAM 640KB
Cache             None
BIOS              Compaq
Dimensions        372mm x 180mm
I/O Options       None
NPU Options       8087

[Image]

                                CONNECTIONS

  Purpose                    Location   Purpose                  Location

  Main power                    P0      Speaker                    SPK

                        USER CONFIGURABLE SETTINGS

                Function                     Switch          Position

  »   Factory configured - do not alter       SW1/1             Off

  »   NPU disabled                            SW1/2             On

      NPU enabled                             SW1/2             Off

  »   Factory configured - do not alter       SW1/3             Off

  »   Factory configured - do not alter       SW1/4             Off

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

    128KB        (9) 4164       (9) 4164         NONE           NONE

    192KB        (9) 4164       (9) 4164       (9) 4164         NONE

    256KB        (9) 4164       (9) 4164       (9) 4164       (9) 4164

    384KB        (9) 4164       (9) 4164      (9) 41256         NONE

    448KB        (9) 4164       (9) 4164       (9) 4164       (9) 41256

    512KB        (9) 41256     (9) 41256         NONE           NONE

    544KB        (9) 4164       (9) 4164      (9) 41256       (9) 41256

    640KB        (9) 4164       (9) 4164      (9) 41256       (9) 41256

  Note:640KB requires ROM version C or later in which case SW2 switch
  settings are ignored.

                         DRAM SWITCH CONFIGURATION

  Size    SW2/1   SW2/2    SW2/3   SW2/4   SW2/5   SW2/6    SW2/7   SW2/8

  128KB    On      Off      On      On      Off     Off     Off      Off

  192KB    On      On      Off      On      Off     Off     Off      Off

  256KB    On      Off     Off      On      Off     Off     Off      Off

  320KB    On      On       On     Off      Off     Off     Off      Off

  384KB    On      Off      On     Off      Off     Off     Off      Off

  448KB    On      On      Off     Off      Off     Off     Off      Off

  512KB    On      Off     Off     Off      Off     Off     Off      Off

  544KB    Off     Off     Off     Off      Off     Off     Off      Off

                FLOPPY DRIVE CONFIGURATION

  Drives installed         SW1/7               SW1/8

         1                  On                  On

         2                  Off                 On

         3                  On                  Off

         4                  Off                 Off

                           MONITOR CONFIGURATION

            Type                     SW1/5                  SW1/6

    80 x 25 color (Compaq             On                     Off
            VDU)

    40 x 25 color (Compaq             Off                    On
            VDU)

    80 x 25 color (EGA or             On                     On
           RGBI)

         Monochrome                   Off                    Off