UNIDENTIFIED

MB1433FA

Processor        80486SX/80487SX/80486DX/80486DX2
Processor Speed  25/33/40/50(internal)/50/66(internal)MHz
Chip Set         Unidentified
Max. Onboard DRAM32MB
Cache            32/64/128/256KB
BIOS             AMI
Dimensions       254mm x 220mm
I/O Options      None
NPU Options      4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J1       Reset switch                J4

  Speaker                     J2       Turbo switch                J5

  Turbo LED                   J3       External battery           JP17

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Keyboard BIOS pin size select 23        JP3           pins 1 & 3
                                                              closed

      Keyboard BIOS pin size select 30        JP3           pins 2 & 4
                                                              closed

  »   Monitor type select monochrome          JP4              Open

      Monitor type select color               JP4             Closed

  »   Chip type select 146818                 JP7              Open

      Chip type select Dallas                 JP7             Closed

  »   CMOS memory normal operation            JP11          pins 2 & 4
                                                              closed

      CMOS memory clear                       JP11          pins 1 & 3
                                                              closed

  »   Fuse enabled                            JPE              Open

      Fuse disabled                           JPE             Closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

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

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

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

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

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

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

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

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

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

                        CACHE JUMPER CONFIGURATION

    Size          jp2          jp13        jp16        jp18       jp20

    32KB       1 & 8, 2 &      1 & 4      1 & 4        Open       Open
               7, 3 & 6, 4
                  & 5

    64KB       1 & 8, 2 &      2 & 3      1 & 4       1 & 4       Open
                7, 4 & 5

   128KB       1 & 8, 2 &      1 & 4      1 & 4      1 & 4, 2    1 & 8, 2
                7, 3 & 6                               & 3         & 7

   256KB      1 & 8, 2 & 7     2 & 3     1 & 4, 2    1 & 4, 2    3 & 6, 4
                                           & 3         & 3         & 5

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

                Type                                  JP10

               80486SX                         pins 3 & 10 closed

               80487SX                 pins 1 & 12, 2 & 11, 5 & 8 closed

               80486DX                 pins 1 & 12, 2 & 11, 3 & 10 closed

              80486DX2                 pins 1 & 12, 2 & 11, 3 & 10 closed