
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

