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R486DX 33 MIBBC

Processor         80486SX/80487SX/80486DX/80486DX2
Processor Speed   25/33/50(internal)/66(internal)MHz
Chip Set          UMC
Max. Onboard DRAM 32MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J1       Turbo switch                J4

  Speaker                     J2       Reset switch                J5

  Turbo LED                   J3       External battery            J6

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select CGA                 JP5             Closed

      Monitor type select monochrome          JP5              Open
      EGA/VGA

     Battery type select internal            JP7             Closed

      Battery type select external            JP7              Open

     Factory configured - do not             JP8              Open
      alter

     Factory configured - do not             JP9           pins 1 & 2
      alter                                                   closed

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       1MB         (4) 256K x 9         NONE

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

       4MB          (4) 1M x 9          NONE

       5MB         (4) 256K x 9     (1) 1M x 36

       8MB          (4) 1M x 9      (1) 1M x 36

      16MB          (4) 4M x 9          NONE

      20MB          (4) 1M x 9      (1) 4M x 36

      32MB          (4) 4M x 9      (1) 4M x 36

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (2) 16K x 4

     128KB      (4) 32K x 8        NONE       (2) 16K x 4

     256KB      (4) 32K x 8    (4) 32K x 8    (2) 16K x 4

                        CACHE JUMPER CONFIGURATION

  Size      W10      W11       W12      W13      W14   W15    W16    W17

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

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

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

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

           Type                      JP2                    JP11

          80486SX                    Open             pins 2 & 3 closed

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

        80486DX/DX2           pins 2 & 3 closed       pins 1 & 2, 3 & 4
                                                           closed

