UNIDENTIFIED

A486SX/DX

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

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery           JP10      Power LED & keylock        JP21

  Reset switch               JP17      Turbo switch               JP22

  Speaker                    JP20      Turbo LED                  JP23

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color               JP4           pins 2 & 3
                                                              closed

      Monitor type select monochrome          JP4              Open

  »   Factory configured - do not             JP6              N/A
      alter

  »   Battery type select DS1287              JP11            Closed

      Battery type select 146818              JP11             Open

  »   Clock input select 2x                   JP12          pins 1 & 2
                                                              closed

      Clock input select 1x                   JP12          pins 2 & 3
                                                              closed

  »   Parity check enabled                    JP13          pins 1 & 2
                                                              closed

      Parity check disabled                   JP13          pins 2 & 3
                                                              closed

  »   Factory configured - do not             JP18             N/A
      alter

  »   PQFP CPU disabled                       JP29            Closed

      PQFP CPU enabled                        JP29             Open

              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

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

      16MB        (4) 4M x 9         NONE

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

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1       TAG (U9)       TAG (U11)

     64KB        (4) 8K x 8     (4) 8K x 8       NONE        (1) 8K x 8

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8        NONE

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

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

     256KB      (4) 32K x 8    (4) 32K x 8       NONE        (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

  Size     JP5   JP7    JP8    JP9     JP24   JP25    JP26   JP27   JP28

  64KB     1 &   1 &    1 &    Open    1 &     1 &    1 &     1 &   2 & 3
           2      2      2              2      2       2      2

  64KB     1 &   1 &    Open    1 &    1 &     1 &    1 &     1 &   2 & 3
           2      2             2       2      2       2      2

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

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

  256KB    1 &   2 &    1 &    Open    1 &     1 &    1 &     1 &   2 & 3
           2      3      2              2      2       2      2

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type               JP14              JP15               JP16

      80486SX          pins 1 & 2         pins 1 & 2           Open
                         closed            closed

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

      80486DX          pins 2 & 3         pins 2 & 3        pins 2 & 3
                         closed            closed             closed

     80486DX2          pins 2 & 3         pins 2 & 3        pins 2 & 3
                         closed            closed             closed