
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

