
UNIDENTIFIED

J-286P SYSTEM BOARD

Processor              80286 (exact location unknown)
Processor Speed        12/16/20/24MHz
Chip Set               Suntac
Max. Onboard DRAM      5MB
Cache                  None
BIOS                   AMI
Dimensions             220mm x 220mm
I/O Options            Floppy drive interface (on some models), IDE
                       interface (on some models)
NPU Options            80287 (exact location unknown)

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Reset switch                J1       Speaker                     J4

  Turbo switch                J2       Power LED & keylock         J5

  Turbo LED                   J3       External battery            JP9

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not             JP1              Open
      alter

     Factory configured - do not             JP2              Open
      alter

     Floppy drive interface enabled          JP5             Closed
      (interface location unknown)

      Floppy drive interface disabled         JP5              Open

     Monitor type select monochrome          JP12             Open

      Monitor type select color               JP12            Closed

     Parity check enabled                    JP13            Closed

      Parity check disabled                   JP13             Open

                            DRAM CONFIGURATION

  Size     Bank 0    Bank 1     Bank 2    Parity 2    Bank 3    Parity 3

   1MB      NONE      NONE        (4)        (4)        (4)     (4) 41256
                                44256      41256      44256

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

   2MB       (2)       (2)        (4)        (4)        (4)     (4) 41256
           256K x     256K x    44256      41256      44256
             9          9

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

   3MB     (2) 1M     NONE        (4)        (4)        (4)     (4) 41256
            x 9                 44256      41256      44256

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

   5MB     (2) 1M     (2) 1M      (4)        (4)        (4)     (4) 41256
            x 9        x 9      44256      41256      44256

                         DRAM JUMPER CONFIGURATION

    Size          JP8             JP9            JP10           JP11

    1MB        pins 2 & 3      pins 2 & 3     pins 2 & 3      pins 2 & 3
                 closed         closed          closed         closed

    1MB        pins 1 & 2      pins 1 & 2     pins 1 & 2      pins 1 & 2
                 closed         closed          closed         closed

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

    2MB        pins 1 & 2      pins 1 & 2     pins 1 & 2      pins 1 & 2
                 closed         closed          closed         closed

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

    4MB        pins 1 & 2      pins 1 & 2     pins 1 & 2      pins 1 & 2
                 closed         closed          closed         closed

    5MB        pins 2 & 3      pins 2 & 3     pins 2 & 3      pins 2 & 3
                 closed         closed          closed         closed

                        IDE INTERFACE CONFIGURATION

         Setting                    JP3                     JP4

         Enabled                   Closed                   Open

         Disabled                   Open                   Closed

  Note: The location of the interface is unknown. Interface is an option
  and may not be present.

                   CPU SPEED CONFIGURATION

    System speed          Bus speed               JP20

        12MHz                6MHz          pins 1 & 2 closed

        16MHz                8MHz          pins 1 & 2 closed

        20MHz                8MHz          pins 2 & 3 closed

        24MHz                8MHz          pins 2 & 3 closed

