UNIDENTIFIED

SI-433C1/SI-450C1

Processor         80486SX/80487SX/80486DX
Processor Speed   16/20/25/33/50MHz
Chip Set          Unidentified
Max. Onboard DRAM 32MB
Cache             32/64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            CN3      Power LED & keylock         CN6

  Reset switch                CN4      Speaker                     CN7

  Turbo switch                CN5      Turbo LED                  LED2

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Power good signal detect from           JP7           pins 1 & 2
      board                                                   closed

      Power good signal detect from           JP7           pins 2 & 3
      power supply                                            closed

  »   CMOS memory normal operation            JP17          pins 1 & 2
                                                              closed

      CMOS memory clear                       JP17          pins 2 & 3
                                                              closed

  »   Monitor type select monochrome          JP19             Open

      Monitor type select color               JP19            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

      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

                  DRAM JUMPER CONFIGURATION

       Setting               JP20                 JP21

       Bank 0          pins 2 & 3 closed   pins 1 & 2 closed

       Bank 1          pins 1 & 2 closed   pins 2 & 3 closed

                            CACHE CONFIGURATION

    Size       Bank 0     Bank 1     TAG (U21)    TAG (U22)    TAG (U39)

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

    64KB      (4) 8K x   (4) 8K x    (1) 4K x 4   (1) 4K x 4    (1) 16K x
                 8          8                                      4

   128KB       (4) 32K     NONE      (1) 16K x    (1) 16K x     (1) 16K x
                x 8                      4            4            4

   256KB       (4) 32K    (4) 32K    (1) 16K x    (1) 16K x     (1) 16K x
                x 8        x 8           4            4            4

                        CACHE JUMPER CONFIGURATION

  Size     JP8   JP9    JP10   JP11    JP12   JP13    JP14   JP15   JP16

  32KB     1 &   1 &    1 &     1 &    1 &     1 &    1 &     1 &   1 & 2
           2      2      2      2       2      2       2      2

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

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

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

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type               JP4               JP5                JP6

      80486SX          pins 2 & 3           Open              Open
                         closed

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

      80486DX          pins 1 & 2          Closed           pins 1 & 2
                         closed                              closed

         CPU SPEED CONFIGURATION

        Speed                JP3

        16MHz         pins 2 & 3 closed

        20MHz         pins 2 & 3 closed

        25MHz         pins 2 & 3 closed

        33MHz         pins 1 & 2 closed

        50MHz         pins 1 & 2 closed