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       # UNIDENTIFIED
       
          SIS 486
       
          Processor     CX486SX/80486SX/80487SX/CX486DX/80486DX/80486DX2 
          Processor     25/33/40/50(internal)/50/66(internal)MHz         
          Speed         
          Chip Set      SIS                                              
          Max. Onboard  64MB                                             
          DRAM          
          Cache         128/256KB                                        
          BIOS          AMI                                              
          Dimensions    254mm x 220mm                                    
          I/O Options   32-bit VESA local bus slots (3)                  
          NPU Options   None                                             
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose           | Location  | Purpose        | Location  |
          |-------------------+-----------+----------------+-----------|
          | Auxiliary         |    CN1    | Turbo switch   | JP22 pins |
          | keyboard          |           |                |  15 - 17  |
          | connector         |           |                |           |
          |-------------------+-----------+----------------+-----------|
          | External battery  |    CN3    | Reset switch   | JP22 pins |
          |                   |           |                |  19 - 20  |
          |-------------------+-----------+----------------+-----------|
          | Power LED &       | JP22 pins | Bus mouse port | JP22 pins |
          | keylock           |   1 - 5   |                |  19 - 20  |
          |-------------------+-----------+----------------+-----------|
          | Speaker           | JP22 pins | 32-bit VESA    | SL1 - SL3 |
          |                   |  6 - 10   | local bus      |           |
          |                   |           | slots          |           |
          |-------------------+-----------+----------------+-----------|
          | Turbo LED         | JP22 pins |                |           |
          |                   |  12 - 13  |                |           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper |  Position  |
          |--------------------------------------+--------+------------|
          | » | Battery type select internal     |  CN3   | pins 2 & 3 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | Battery type select external     |  CN3   |   Closed   |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  JGPC  |    N/A     |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Monitor type select monochrome   |  JP1   |    Open    |
          |---+----------------------------------+--------+------------|
          |   | Monitor type select color        |  JP1   |   Closed   |
          |---+----------------------------------+--------+------------|
          | » | PQFP CPU disabled                |  JP5   |   Closed   |
          |---+----------------------------------+--------+------------|
          |   | PQFP CPU enabled                 |  JP5   |    Open    |
          |---+----------------------------------+--------+------------|
          | » | CPU speed select 50MHz (Cyrix    |  JP6   | pins 1 & 2 |
          |   | only)                            |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | CPU speed select <50MHz (Cyrix   |  JP6   | pins 2 & 3 |
          |   | only)                            |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | CPU type select all              |  JP16  | pins 2 & 3 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | CPU type select 80486DX-40/50    |  JP16  | pins 1 & 2 |
          |   | only                             |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | VESA card select normal          |  JP23  |    Open    |
          |---+----------------------------------+--------+------------|
          |   | VESA card select Genoa           |  JP23  |   Closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |    Size    |    Bank 0     |    Bank 1     |    Bank 2     |
          |------------+---------------+---------------+---------------|
          |    4MB     | (4) 256K x 9  | (1) 256K x 36 | (1) 512K x 36 |
          |------------+---------------+---------------+---------------|
          |    4MB     |     NONE      | (1) 512K x 36 | (1) 512K x 36 |
          |------------+---------------+---------------+---------------|
          |    8MB     |  (4) 1M x 9   | (1) 512K x 36 | (1) 512K x 36 |
          |------------+---------------+---------------+---------------|
          |    20MB    |  (4) 4M x 9   | (1) 512K x 36 | (1) 512K x 36 |
          |------------+---------------+---------------+---------------|
          |    4MB     |  (4) 1M x 9   |     NONE      |     NONE      |
          |------------+---------------+---------------+---------------|
          |    8MB     |     NONE      |  (1) 1M x 36  |  (1) 1M x 36  |
          |------------+---------------+---------------+---------------|
          |    8MB     |  (4) 1M x 9   |  (1) 1M x 36  |     NONE      |
          |------------+---------------+---------------+---------------|
          |    12MB    |  (4) 1M x 9   |  (1) 1M x 36  |  (1) 1M x 36  |
          |------------+---------------+---------------+---------------|
          |    16MB    |     NONE      |  (1) 4M x 36  |     NONE      |
          |------------+---------------+---------------+---------------|
          |    16MB    |  (4) 4M x 9   |     NONE      |     NONE      |
          |------------+---------------+---------------+---------------|
          |    32MB    |     NONE      |  (1) 4M x 36  |  (1) 4M x 36  |
          |------------+---------------+---------------+---------------|
          |    64MB    |  (4) 4M x 9   |  (1) 4M x 36  |  (1) 4M x 36  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          | Size |       JPA       |       JPB       |       JPC       |
          |------+-----------------+-----------------+-----------------|
          | 4MB  |   pins 1 & 2    |   pins 4 & 5    |   pins 1 & 2    |
          |      |     closed      |     closed      |     closed      |
          |------+-----------------+-----------------+-----------------|
          | 4MB  |   pins 2 & 3    |      Open       |      Open       |
          |      |     closed      |                 |                 |
          |------+-----------------+-----------------+-----------------|
          | 8MB  |   pins 2 & 3    |   pins 2 & 3    |   pins 1 & 2    |
          |      |     closed      |     closed      |     closed      |
          |------+-----------------+-----------------+-----------------|
          | 20MB |   pins 2 & 3    |   pins 2 & 3    |   pins 1 & 2    |
          |      |     closed      |     closed      |     closed      |
          |------+-----------------+-----------------+-----------------|
          | 4MB  |      Open       |      Open       |   pins 2 & 3    |
          |      |                 |                 |     closed      |
          |------+-----------------+-----------------+-----------------|
          | 8MB  |   pins 2 & 3    |      Open       |      Open       |
          |      |     closed      |                 |                 |
          |------+-----------------+-----------------+-----------------|
          | 8MB  |      Open       |   pins 4 & 5    |   pins 1 & 2    |
          |      |                 |     closed      |     closed      |
          |------+-----------------+-----------------+-----------------|
          | 12MB |   pins 1 & 2    |   pins 4 & 5    |   pins 1 & 2    |
          |      |     closed      |     closed      |     closed      |
          |------+-----------------+-----------------+-----------------|
          | 16MB |      Open       |      Open       |      Open       |
          |------+-----------------+-----------------+-----------------|
          | 16MB |      Open       |      Open       |   pins 2 & 3    |
          |      |                 |                 |     closed      |
          |------+-----------------+-----------------+-----------------|
          | 32MB |   pins 2 & 3    |      Open       |      Open       |
          |      |     closed      |                 |                 |
          |------+-----------------+-----------------+-----------------|
          | 64MB |   pins 1 & 2    |   pins 1 & 2    |   pins 1 & 2    |
          |      |     closed      |     closed      |     closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    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  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size  |       JP2       |       JP3       |      JP4       |
          |-------+-----------------+-----------------+----------------|
          | 128KB |   pins 1 & 2    |   pins 1 & 2    |   pins 1 & 2   |
          |       |     closed      |     closed      |     closed     |
          |-------+-----------------+-----------------+----------------|
          | 256KB |   pins 2 & 3    |   pins 2 & 3    |   pins 2 & 3   |
          |       |     closed      |     closed      |     closed     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |   Type    |       JP12        |       JP13        |  JP15  |
          |-----------+-------------------+-------------------+--------|
          |  80486SX  |       Open        | pins 2 & 3 closed |  Open  |
          |-----------+-------------------+-------------------+--------|
          |  80487SX  | pins 2 & 3 closed | pins 1 & 2 closed | Closed |
          |-----------+-------------------+-------------------+--------|
          |  80486DX  | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
          |-----------+-------------------+-------------------+--------|
          | 80486DX2  | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |    Speed    |     JS0     |    JS1     |        JS2        |
          |-------------+-------------+------------+-------------------|
          |    25MHz    |    Open     |    Open    |      Closed       |
          |-------------+-------------+------------+-------------------|
          |    33MHz    |   Closed    |    Open    |       Open        |
          |-------------+-------------+------------+-------------------|
          |    40MHz    |   Closed    |   Closed   |       Open        |
          |-------------+-------------+------------+-------------------|
          |   50iMHz    |    Open     |    Open    |      Closed       |
          |-------------+-------------+------------+-------------------|
          |    50MHz    |    Open     |   Closed   | pins 1 & 2 closed |
          |-------------+-------------+------------+-------------------|
          |   66iMHz    |   Closed    |    Open    |       Open        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               VESA WAIT STATE CONFIGURATION                |
          |------------------------------------------------------------|
          |        Wait states         |              JP8              |
          |----------------------------+-------------------------------|
          |       0 wait states        |       pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |        1 wait state        |       pins 2 & 3 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BUS SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |         CPU speed          |              JP9              |
          |----------------------------+-------------------------------|
          |          <= 33MHz          |       pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |          > 33MHz           |       pins 2 & 3 closed       |
          +------------------------------------------------------------+