
POSITIVE CORPORATION

PERSONAL COMPUTER SYTEMS SYSTEM BOARD

Processor           80386SX/80486SX/80487SX (depends on CPU board
                    installed)
Processor Speed     20/33MHz
Chip Set            Unidentified
Max. Onboard DRAM   32MB
Cache               32/128KB (depends on CPU board installed)
BIOS                Unidentified
Dimensions          254mm x 218mm
I/O Options         Parallel port, serial ports (2), VGA port, VGA feature
                    connector, floppy drive interface, IDE interface,
                    riser slot, CPU slot
NPU Options         80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  VGA port                    J2       External battery            J17

  Serial port 1               J3       Turbo LED                   J25

  Serial port 2               J4       IDE interface LED           J26

  Parallel port               J5       Auxiliary speaker           J27

  VGA feature connector       J7       Reset switch                S1

  Floppy drive interface      J11      Riser Card                  SL1

  IDE interface               J12      CPU slot                    SL2

  Speaker                     J16

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     256KB - 640KB memory enabled             J6           pins 1 & 2
                                                              closed

      256KB - 640KB memory disabled            J6        pins 1 & 2 open

     512KB - 640KB memory enabled             J6           pins 3 & 4
                                                              closed

      512KB - 640KB memory disabled            J6        pins 3 & 4 open

     Security disabled                        J6           pins 5 & 6
                                                              closed

      Security enabled                         J6        pins 5 & 6 open

     VGA mode select PS/2                    J10           pins 5 & 6
                                                              closed

      VGA mode select AT                      J10        pins 5 & 6 open

     Monitor timing select any               J10        pins 7 & 8 open
      monitor timing

      Monitor timing select Multi Sync        J10           pins 7 & 8
      1 timing                                                closed

     Factory configured - do not             J13              N/A
      alter

     Factory configured - do not             J28              N/A
      alter

                            DRAM CONFIGURATION

     Size          Bank 0        Bank 1         Bank 2         Bank 3

     512KB      (2) 256K x 9      NONE           NONE           NONE

      1MB       (2) 256K x 9   (2) 256K x 9      NONE           NONE

     1.5MB      (2) 256K x 9   (2) 256K x 9   (2) 256K x 9      NONE

      2MB       (2) 256K x 9   (2) 256K x 9   (2) 256K x 9  (2) 256K x 9

      2MB        (2) 1M x 9       NONE           NONE           NONE

     2.5MB       (2) 1M x 9    (2) 256K x 9      NONE           NONE

      3MB       (2) 256K x 9   (2) 256K x 9   (2) 1M x 9        NONE

     3.5MB      (2) 256K x 9   (2) 256K x 9   (2) 1M x 9    (2) 256K x 9

      4MB        (2) 1M x 9    (2) 1M x 9        NONE           NONE

     4.5MB       (2) 1M x 9    (2) 1M x 9     (2) 256K x 9      NONE

      5MB        (2) 1M x 9    (2) 1M x 9     (2) 256K x 9  (2) 256K x 9

      6MB        (2) 1M x 9    (2) 1M x 9     (2) 1M x 9        NONE

     6.5MB       (2) 1M x 9    (2) 1M x 9     (2) 1M x 9    (2) 256K x 9

      8MB        (2) 1M x 9    (2) 1M x 9     (2) 1M x 9     (2) 1M x 9

      8MB        (2) 4M x 9       NONE           NONE           NONE

     8.5MB       (2) 4M x 9    (2) 256K x 9      NONE           NONE

      9MB       (2) 256K x 9   (2) 256K x 9   (2) 4M x 9        NONE

     10MB        (2) 4M x 9    (2) 1M x 9        NONE           NONE

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1         Bank 2          Bank 3

     12MB        (2) 4M x 9    (2) 1M x 9     (2) 1M x 9         NONE

     14MB        (2) 1M x 9    (2) 1M x 9     (2) 4M x 9      (2) 1M x 9

     16MB        (2) 4M x 9    (2) 4M x 9        NONE            NONE

    16.5MB       (2) 4M x 9    (2) 4M x 9     (2) 256K x 9       NONE

     17MB        (2) 4M x 9    (2) 4M x 9     (2) 256K x 9   (2) 256K x 9

     18MB        (2) 4M x 9    (2) 4M x 9     (2) 1M x 9         NONE

     20MB        (2) 4M x 9    (2) 4M x 9     (2) 1M x 9      (2) 1M x 9

     24MB        (2) 4M x 9    (2) 4M x 9     (2) 4M x 9         NONE

     32MB        (2) 4M x 9    (2) 4M x 9     (2) 4M x 9      (2) 4M x 9

     VRAM CONFIGURATION

   Size     Bank 0   Bank 1

  512KB     512KB     NONE

   1MB      512KB    512KB

[Image]

            CACHE CONFIGURATION

     Size          Bank 0        Bank 1

     32KB        (2) 8K x 8    (2) 8K x 8

     128KB       (2) 32K x 8   (2) 32K x 8

        CACHE JUMPER CONFIGURATION

        Size                 JP1

        32KB          pins 1 & 2 closed

        128KB         pins 3 & 4 closed

[Image]

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not             JP1              N/A
      alter

[Image]

         CPU TYPE CONFIGURATION

     Type          JP1          JP2

  80486SX-20      Open         Closed

  80486SX-33     Closed         Open

  80487SX-20     Closed         Open

