
SILICON STAR INTERNATIONAL, INC.

AN4

Processor        80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed  25/33/40/50(internal)/50/66(internal)MHz
Chip Set         SIS
Max. Onboard DRAM64MB
Cache            128/256/512KB
BIOS             AMI/Award
Dimensions       260mm x 220mm
I/O Options      32-bit VESA local bus slots (3), green PC feature
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                   Location     Purpose               Location

  External battery             J1        Reset switch             JW3

  Green PC monitor AC         JP8        Turbo switch             JW4
  connector

  Power LED & keylock         JW1        Turbo LED                JW5

  Speaker                     JW2        32-bit VESA Local     SL1 - SL3
                                         bus slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not             JP9             Closed
      alter

     CMOS memory normal operation            JP10          pins 1 & 2
                                                              closed

      CMOS memory clear                       JP10          pins 2 & 3
                                                              closed

     Green PC enabled                        JP13            Closed

      Green PC disabled                       JP13             Open

     Factory configured - do not             JP19             Open
      alter

     Factory configured - do not             JP36            Closed
      alter

  Note: The location of the factory configured jumpers is unidentified.

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB       (4) 256K x 9       NONE           NONE           NONE

     1MB        (1) 256K x        NONE           NONE           NONE
                    36

     2MB       (4) 256K x 9   (4) 256K x 9       NONE           NONE

     2MB        (1) 256K x     (1) 256K x        NONE           NONE
                    36             36

     4MB        (4) 1M x 9        NONE           NONE           NONE

     4MB       (1) 1M x 36        NONE           NONE           NONE

     6MB        (1) 256K x     (1) 256K x     (4) 1M x 9        NONE
                    36             36

     6MB        (4) 1M x 9     (1) 256K x     (1) 256K x        NONE
                                   36             36

     8MB       (1) 2M x 36        NONE           NONE           NONE

     8MB        (4) 1M x 9     (4) 1M x 9        NONE           NONE

     10MB      (4) 256K x 9   (4) 256K x 9   (1) 1M x 36     (1) 1M x 36

     10MB      (1) 1M x 36    (1) 1M x 36    (4) 256K x 9   (4) 256K x 9

     12MB       (4) 1M x 9    (1) 1M x 36    (1) 1M x 36        NONE

     16MB       (4) 1M x 9     (4) 1M x 9    (1) 1M x 36     (1) 1M x 36

     16MB      (1) 2M x 36    (1) 2M x 36        NONE           NONE

     16MB      (1) 4M x 36        NONE           NONE           NONE

     16MB       (4) 4M x 9        NONE           NONE           NONE

     18MB      (4) 256K x 9   (4) 256K x 9   (1) 4M x 36        NONE

     20MB      (1) 1M x 36    (1) 4M x 36        NONE           NONE

     24MB      (1) 1M x 36    (1) 1M x 36    (1) 4M x 36        NONE

     24MB       (4) 1M x 9     (4) 1M x 9    (1) 4M x 36        NONE

     24MB      (1) 2M x 36    (1) 2M x 36    (1) 2M x 36        NONE

     32MB      (1) 2M x 36    (1) 2M x 36    (1) 2M x 36     (1) 2M x 36

     32MB      (1) 4M x 36    (1) 4M x 36        NONE           NONE

     32MB       (4) 4M x 9     (4) 4M x 9        NONE           NONE

     36MB      (1) 1M x 36    (1) 4M x 36    (1) 4M x 36        NONE

     36MB       (4) 4M x 9     (4) 4M x 9    (1) 1M x 36        NONE

                           DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     40MB       (1) 1M x 36   (1) 1M x 36    (1) 4M x 36    (1) 4M x 36

     40MB       (4) 4M x 9     (4) 4M x 9    (1) 2M x 36       NONE

     48MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36       NONE

     48MB       (4) 4M x 9     (4) 4M x 9    (1) 4M x 36       NONE

     64MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

                         DRAM JUMPER CONFIGURATION

  Bank 0    Bank 1    Bank 2     Bank 3     JP39      JP40        JP41

  SIMM 1     SIMM 5    SIMM 9    SIMM 10   1 & 2      1 & 2       Open
   - 4        - 8       (S)       (S)

  SIMM 1     SIMM 5    SIMM 9    SIMM 10   1 & 2      1 & 2       Open
   - 4        - 8       (D)       (D)

  SIMM 9    SIMM 10    SIMM 1    SIMM 5    2 & 3      2 & 3       Open
   (S)        (S)       - 4       - 8

  SIMM 9    SIMM 10    SIMM 1    SIMM 5    2 & 3      2 & 3       Open
   (D)        (D)       - 4       - 8

  SIMM 9     SIMM 9   SIMM 10    SIMM 10   2 & 3      2 & 3      Closed
   (D)        (D)       (D)       (D)

  SIMM 9     SIMM 5    SIMM 1     NONE     2 & 3      1 & 2       Open
   (S)        - 8       - 4

  SIMM 1    SIMM 10    SIMM 9     NONE     1 & 2      Open        Open
   - 4        (S)       (S)

  SIMM 1    SIMM 10    SIMM 9    SIMM 9    1 & 2      Open        Open
   - 4        (S)       (D)       (D)

  SIMM 9     SIMM 9   SIMM 10    SIMM 5     Open      2 & 3      Closed
   (D)        (D)       (S)       - 8

  Note: Pins designated should be in the closed position.

                     DRAM JUMPER CONFIGURATION (CONT)

  Bank 0     Bank 1    Bank 2     Bank 3     JP42       JP43       JP44

   SIMM 1    SIMM 5     SIMM 9    SIMM 10    1 & 2     1 & 2      1 & 2
    - 4       - 8        (S)       (S)

   SIMM 1    SIMM 5     SIMM 9    SIMM 10    1 & 2     1 & 2      1 & 2
    - 4       - 8        (D)       (D)

   SIMM 9    SIMM 10    SIMM 1    SIMM 5     2 & 3     1 & 2      2 & 3
    (S)       (S)        - 4       - 8

   SIMM 9    SIMM 10    SIMM 1    SIMM 5     2 & 3     2 & 3      1 & 2
    (D)       (D)        - 4       - 8

   SIMM 9    SIMM 9    SIMM 10    SIMM 10    2 & 3     2 & 3       Open
    (D)       (D)        (D)       (D)

   SIMM 9    SIMM 5     SIMM 1     NONE      2 & 3      Open       Open
    (S)       - 8        - 4

   SIMM 1    SIMM 10    SIMM 9     NONE      1 & 2     1 & 2      2 & 3
    - 4       (S)        (S)

   SIMM 1    SIMM 10    SIMM 9    SIMM 9     1 & 2     1 & 2      2 & 3
    - 4       (S)        (D)       (D)

   SIMM 9    SIMM 9    SIMM 10    SIMM 5     2 & 3     2 & 3       Open
    (D)       (D)        (S)       - 8

  Note: Pins designated should be in the closed position.

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

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

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

     512KB       (4) 128K x 8        NONE        (1) 32K x 8

                  CACHE JUMPER CONFIGURATION

  Size      JP1     JP2      JP3`     JP20     JP21    JP38

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

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

  512KB    1 & 2   1 & 2    2 & 3    2 & 3    2 & 3    2 & 3

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

        Type                JP15              JP16              JP18

       80486SX           pins 2 & 3           Open              Open
                           closed

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

     80486DX/DX2         pins 1 & 2        pins 1 & 2          Closed
                           closed            closed

         CPU SPEED CONFIGURATION

  Speed      JP11      JP12      JP14

  25MHz      Open     Closed    Closed

  33MHz     Closed    Closed     Open

  40MHz      Open      Open     Closed

  50iMHz     Open     Closed    Closed

  50MHz     Closed     Open      Open

  66iMHz    Closed    Closed     Open

      VESA WAIT STATE CONFIGURATION

     Wait states             JP4

    0 wait states     pins 1 & 2 closed

    1 wait state      pins 2 & 3 closed

       VESA BUS SPEED CONFIGURATION

      CPU speed              JP5

      < = 33MHz       pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed

    GREEN PC CONFIGURATION

  Description       JP8

    Signal         pin 1

    Ground         pin 2

