
SILICON STAR INTERNATIONAL, INC.

AH4/AH4T (REV. 1.2)

Processor  80486SX/SL80486SX/CX486M7/80486DX/SL80486DX/CX486DX2/AM486DX2/80486DX2/SL80486DX2/AM486DX4/80486DX4
Processor  20/25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentifed
Max.       128MB
Onboard
DRAM
Cache      128/256/512KB
BIOS       Award
Dimensions 330mm x 218mm
I/O        32-bit VESA local bus slots (3), green PC connector
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose               Location

  External battery            J1        Reset switch             JW3

  Green PC connector     JP45 pins 7 -  Turbo LED                JW4
                              8

  Power LED & keylock        JW1        Turbo switch             JW5

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

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     CMOS memory normal operation            JP16          pins 1 & 2
                                                              closed

      CMOS memory clear                       JP16          pins 2 & 3
                                                              closed

     Factory configured - do not             JP17             N/A
      alter

     Factory configured - do not             JP19          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP23          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP26             Open
      alter

     Factory configured - do not             JP30             N/A
      alter

     Factory configured - do not             JP31             N/A
      alter

     Factory configured - do not             JP42            Closed
      alter

  Note: The locations of JP19, JP23 & JP42 are unidentified.

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2          Bank 3

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

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

     2MB         (1) 512K x       NONE           NONE            NONE
                    36

     4MB         (1) 512K x     (1) 512K x       NONE            NONE
                    36             36

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

     4MB         (1) 256K x     (1) 256K x     (1) 512K x        NONE
                    36             36             36

     5MB         (1) 256K x    (1) 1M x 36       NONE            NONE
                    36

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

     6MB         (1) 512K x    (1) 1M x 36       NONE            NONE
                    36

     8MB         (1) 256K x     (1) 256K x     (1) 512K x    (1) 1M x 36
                    36             36             36

     8MB         (1) 512K x     (1) 512K x    (1) 1M x 36        NONE
                    36             36

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

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

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

     12MB        (1) 512K x     (1) 512K x    (1) 1M x 36    (1) 1M x 36
                    36             36

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

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

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

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

     17MB        (1) 256K x    (1) 4M x 36       NONE            NONE
                    36

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

     20MB        (1) 512K x     (1) 512K x    (1) 4M x 36        NONE
                    36             36

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

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

     24MB        (1) 512K x     (1) 512K x    (1) 1M x 36    (1) 4M x 36
                    36             36

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 4M 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       (1) 8M x 36       NONE           NONE            NONE

     36MB        (1) 512K x     (1) 512K x    (1) 4M x 36    (1) 4M x 36
                    36             36

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

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

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

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

     40MB        (1) 1M x 36    (1) 1M x 36    (1) 8M x 36       NONE

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

     48MB        (1) 4M x 36    (1) 8M x 36       NONE           NONE

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

     64MB        (1) 16M x 36      NONE           NONE           NONE

     64MB        (1) 4M x 36    (1) 4M x 36    (1) 8M x 36       NONE

     64MB        (1) 8M x 36    (1) 8M x 36       NONE           NONE

     65MB         (1) 256K x     (1) 16M x        NONE           NONE
                     36             36

     68MB        (1) 1M x 36     (1) 16M x        NONE           NONE
                                    36

     68MB        (1) 1M x 36    (1) 8M x 36    (1) 8M x 36       NONE

     72MB        (1) 1M x 36    (1) 1M x 36     (1) 16M x        NONE
                                                   36

     72MB        (1) 1M x 36    (1) 1M x 36    (1) 8M x 36   (1) 8M x 36

     80MB        (1) 4M x 36     (1) 16M x        NONE           NONE
                                    36

     80MB        (1) 4M x 36    (1) 8M x 36    (1) 8M x 36       NONE

     96MB        (1) 4M x 36    (1) 4M x 36     (1) 16M x        NONE
                                                   36

     96MB        (1) 4M x 36    (1) 4M x 36    (1) 8M x 36   (1) 8M x 36

     96MB        (1) 8M x 36    (1) 8M x 36    (1) 8M x 36       NONE

     128MB       (1) 16M x 36    (1) 16M x        NONE           NONE
                                    36

     128MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

                      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

     256KB        (4) 64K x 8        NONE        (1) 32K x 8

     512KB        (4) 64K x 8     (4) 64K x 8    (1) 32K x 8

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

                 CACHE JUMPER CONFIGURATION

   Size       JP1       JP2       JP4       JP40      JP41

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

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

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

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

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

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

      Type           JP8        JP9         JP11       JP12        JP14

     80486SX        2 & 3       Open        Open       3 & 4      2 & 3

    SL80486SX       2 & 3       Open        Open       3 & 4      2 & 3

     CX486M7        1 & 2      Closed       2 & 3      2 & 3     1 & 2, 3
                                                                   & 4

     80486DX        1 & 2      Closed       2 & 3      3 & 4      2 & 3

    SL80486DX       1 & 2      Closed       2 & 3      3 & 4      2 & 3

    CX486DX2        1 & 2      Closed       2 & 3      2 & 3     1 & 2, 3
                                                                   & 4

    AM486DX2        1 & 2      Closed       2 & 3      3 & 4      2 & 3

    80486DX2        1 & 2      Closed       2 & 3      3 & 4      2 & 3

   SL80486DX2       1 & 2      Closed       2 & 3      3 & 4      2 & 3

    AM486DX4        1 & 2      Closed       2 & 3      3 & 4      2 & 3

    80486DX4        1 & 2      Closed       2 & 3      3 & 4      2 & 3

            Note: Pins designated should be in the closed position.
            SL80486DX/DX2 is only available on the AH4T mainboard

                          CPU TYPE CONFIGURATION

      Type           JP15       JP21        JP22       JP24       JP25

     80486SX        4 & 5       2 & 3      1 & 2       Open       Open

    SL80486SX       4 & 5       2 & 3      1 & 2       Open       Open

     CX486M7        2 & 3       1 & 2      2 & 3      2 & 3       2 & 3

     80486DX        4 & 5       2 & 3      1 & 2       Open       Open

    SL80486DX       4 & 5       2 & 3      1 & 2       Open       Open

    CX486DX2        2 & 3       1 & 2      2 & 3      2 & 3       2 & 3

    AM486DX2        4 & 5       2 & 3      1 & 2       Open       Open

    80486DX2        4 & 5       2 & 3      1 & 2       Open       Open

   SL80486DX2       4 & 5       2 & 3      1 & 2       Open       Open

    AM486DX4        4 & 5       2 & 3      1 & 2       Open       Open

    80486DX4        4 & 5       2 & 3      1 & 2       Open       Open

            Note: Pins designated should be in the closed position.
            SL80486DX/DX2 is only available on the AH4T mainboard

                          CPU TYPE CONFIGURATION

      Type        JP32     JP46      JP48     JP49     JP50       JP62

    80486SX      1 & 2     2 & 3    2 & 3     Open     2 & 3      Open

   SL80486SX     1 & 2     2 & 3    2 & 3     Open     2 & 3      Open

    CX486M7      1 & 2     1 & 2    2 & 3     Open     2 & 3      Open

    80486DX      1 & 2     2 & 3    2 & 3     Open     2 & 3      Open

   SL80486DX     1 & 2     2 & 3    2 & 3     Open     2 & 3      Open

    CX486DX2     1 & 2     1 & 2    1 & 2     Open     1 & 2      Open

    AM486DX2     1 & 2     2 & 3    1 & 2     Open     1 & 2      Open

    80486DX2     1 & 2     2 & 3    2 & 3     Open     2 & 3      Open

   SL80486DX2    1 & 2     2 & 3    2 & 3     Open     2 & 3      Open

    AM486DX4     1 & 2     2 & 3    1 & 2     1 & 2    1 & 2     Closed

    80486DX4      Open     2 & 3    1 & 2     1 & 2    1 & 2      Open

            Note: Pins designated should be in the closed position.
            SL80486DX/DX2 is only available on the AH4T mainboard

          CPU SPEED CONFIGURATION

   Speed      JP5        JP6        JP7

   20MHz     Closed      Open     Closed

   25MHz     Closed     Closed     Open

   33MHz      Open      Closed    Closed

   40MHz     Closed      Open      Open

  50iMHz     Closed     Closed     Open

  66iMHz      Open      Closed    Closed

  75iMHz     Closed     Closed     Open

  100iMHz     Open      Closed    Closed

               CPU VOLTAGE CONFIGURATION

  Voltage     JP53       JP54        JP55       JP56

   3.3v      Closed      Open        Open       Open

   3.45v      Open      Closed       Open       Open

   3.6v       Open       Open       Closed      Open

    4v        Open       Open        Open      Closed

         BUS SPEED CONFIGURATION

      CPU speed              JP29

      <= 33MHz        pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed

