JPN CORPORATION

MB-486 DX-33 UM


Processor         80486SX/80487SX/80486DX
Processor Speed   33MHz
Chip Set          UMC
Max. Onboard DRAM 40MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167


[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J1       Reset switch                J4

  Speaker                     J2       Turbo LED                   J5

  Turbo switch                J3       External battery            J6

                        USER CONFIGURABLE SETTINGS

                  Function                     Jumper         Position

  »   Monitor type select CGA                    W18           Closed

      Monitor type select                        W18            Open
      monochrome/EGA/VGA

  »   Battery select internal                    W22           Closed

      Battery select external                    W22            Open

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

    1MB 1      (4) 256K x 9       NONE           NONE           NONE

    1MB 2          NONE           NONE        (1) 256K x        NONE
                                                  36

    2MB 1      (4) 256K x 9   (4) 256K x 9       NONE           NONE

    2MB 2          NONE           NONE        (1) 256K x    (1) 256K x 36
                                                  36

    3MB 1      (4) 256K x 9   (4) 256K x 9    (1) 256K x        NONE
                                                  36

    3MB 2      (4) 256K x 9       NONE        (1) 256K x    (1) 256K x 36
                                                  36

    4MB 1      (4) 256K x 9   (4) 256K x 9    (1) 256K x    (1) 256K x 36
                                                  36

    4MB 2      (4) 256K x 9   (4) 256K x 9    (1) 256K x    (1) 256K x 36
                                                  36

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

    4MB 2          NONE           NONE       (1) 1M x 36        NONE

    5MB 1      (4) 256K x 9    (4) 1M x 9        NONE           NONE

    5MB 2          NONE           NONE        (1) 256K x     (1) 1M x 36
                                                  36

    6MB 1      (4) 256K x 9   (4) 256K x 9   (1) 1M x 36        NONE

    6MB 2       (4) 1M x 9        NONE        (1) 256K x    (1) 256K x 36
                                                  36

    8MB 1       (4) 1M x 9     (4) 1M x 9        NONE           NONE

    8MB 2          NONE           NONE       (1) 1M x 36     (1) 1M x 36

    9MB 1      (4) 256K x 9    (4) 1M x 9    (1) 1M x 36        NONE

    9MB 2       (4) 1M x 9        NONE        (1) 256K x     (1) 1M x 36
                                                  36

    10MB 1     (4) 256K x 9   (4) 256K x 9   (1) 1M x 36     (1) 1M x 36

    10MB 2      (4) 1M x 9     (4) 1M x 9     (1) 256K x    (1) 256K x 36
                                                  36

    12MB 1      (4) 1M x 9     (4) 1M x 9    (1) 1M x 36        NONE

    12MB 2      (4) 1M x 9        NONE       (1) 1M x 36     (1) 1M x 36

    16MB 1      (4) 1M x 9     (4) 1M x 9    (1) 1M x 36     (1) 1M x 36

    16MB 2      (4) 1M x 9     (4) 1M x 9    (1) 1M x 36     (1) 1M x 36

    16MB 1      (4) 4M x 9        NONE           NONE           NONE

    16MB 2         NONE           NONE       (1) 4M x 36        NONE

    20MB 1      (4) 1M x 9     (4) 4M x 9        NONE           NONE

    20MB 2         NONE           NONE       (1) 1M x 36     (1) 4M x 36

    24MB 1      (4) 1M x 9     (4) 1M x 9    (1) 4M x 36        NONE

    24MB 2      (4) 4M x 9        NONE       (1) 1M x 36     (1) 1M x 36

    32MB 1      (4) 4M x 9     (4) 4M x 9        NONE           NONE

    32MB 2         NONE           NONE       (1) 4M x 36     (1) 4M x 36

    40MB 1      (4) 1M x 9     (4) 1M x 9    (1) 4M x 36     (1) 4M x 36

    40MB 2      (4) 4M x 9     (4) 4M x 9    (1) 1M x 36     (1) 1M x 36

  Note 1 :On jumpers W12, W13, W15, and W16 - pins 1 & 2 should be in the
  closed position.

  Note 2 :On jumpers W12, W13, W15, and W16 - pins 2 & 3 should be in the
  closed position.

                            CACHE CONFIGURATION

     Size         Bank 0        Bank 1        Dirty Bit       TAG (U11)
                                               (U10)

     64KB       (4) 8K x 8    (4) 8K x 8    (1) 16K x 8      (1) 8K x 8

     128KB      (4) 32K x 8      NONE       (1) 16K x 8      (1) 8K x 8

     256KB      (4) 32K x 8   (4) 32K x 8   (1) 16K x 8      (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

   Size    W2    W3      W4     W5      W6       W7        W8       W9

   64KB    1 &   1 &    Open    1 &    Open     Open      Open     Open
            2     2             2

  128KB    2 &   1 &    1 & 2   2 &   Closed    Open      Open     Open
            3     2             3

  256KB    2 &   2 &    2 & 3   1 &   Closed    Closed   Closed    Closed
            3     3             2

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

          Type                     W10                      W11

         80486SX                   Open              pins 2 & 3 closed

         80487SX            pins 2 & 3 closed       pins 1 & 2 and 3 & 4
                                                           closed

         80486DX            pins 1 & 2 closed       pins 1 & 2 and 3 & 4
                                                           closed