(TXT) View Source
       
       # UNIDENTIFIED
       
          STC-SIS486C-DX/SX
       
          Processor         80486SX/80487SX/80486DX                      
          Processor Speed   20/25/33/50MHz                               
          Chip Set          SIS                                          
          Max. onboard DRAM 32MB                                         
          Cache             32/64/128/256KB                              
          BIOS              AMI                                          
          Dimensions        218mm x 218mm                                
          I/O Options       None                                         
          NPU Options       None                                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose             | Location | Purpose        | Location |
          |---------------------+----------+----------------+----------|
          | External battery    |    J1    | Turbo LED      |    J6    |
          |---------------------+----------+----------------+----------|
          | Power LED & keylock |    J3    | Turbo switch   |    J7    |
          |---------------------+----------+----------------+----------|
          | Speaker             |    J4    | Reset switch   |    J8    |
          |---------------------+----------+----------------+----------|
          | Unknown             |    J5    |                |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper |  Position  |
          |--------------------------------------+--------+------------|
          | » | CMOS memory normal operation     |   J1   | pins 2 & 3 |
          |   | (internal battery)               |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | CMOS memory normal operation     |   J1   | pins 1 & 4 |
          |   | (external battery)               |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | CMOS memory clear                |   J1   |    Open    |
          |---+----------------------------------+--------+------------|
          | » | Monitor type select color        |   J2   |   Closed   |
          |---+----------------------------------+--------+------------|
          |   | Monitor type select monochrome   |   J2   |    Open    |
          |---+----------------------------------+--------+------------|
          | » | CPU speed select iOSC/1          |   J9   | pins 1 & 2 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | CPU speed select iOSC/2          |   J9   | pins 2 & 3 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Turbo switch enabled             |  J10   |   Closed   |
          |---+----------------------------------+--------+------------|
          |   | Turbo switch disabled            |  J10   |    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        |
          |------------------+--------------------+--------------------|
          |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
          |------------------+--------------------+--------------------|
          |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          | Size  | Bank 0 (U26  | Bank 1 (U22 - |   Tag   | Dirty Bit |
          |       |    - 29)     |     U25)      |         |           |
          |-------+--------------+---------------+---------+-----------|
          | 32KB  |  (4) 8K x 8  |     NONE      | 8K x 8  |  16K x 4  |
          |-------+--------------+---------------+---------+-----------|
          | 64KB  |  (4) 8K x 8  |  (4) 8K x 8   | 8K x 8  |  16K x 4  |
          |-------+--------------+---------------+---------+-----------|
          | 128KB | (4) 32K x 8  |     NONE      | 32K x 8 |  16K x 4  |
          |-------+--------------+---------------+---------+-----------|
          | 256KB | (4) 32K x 8  |  (4) 32K x 8  | 32K x 8 |  16K x 4  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size | J11 | J12 | J13 | J14 | J15 | J16 | J17 | J18 | J19 |
          |------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
          | 32KB |1 & 2|Open |1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|
          |------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
          | 64KB |2 & 3|Open |1 & 2|2 & 3|1 & 2|1 & 2|2 & 3|1 & 2|1 & 2|
          |------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
          |128KB |1 & 2|1 & 2|2 & 3|2 & 3|2 & 3|1 & 2|2 & 3|2 & 3|1 & 2|
          |------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
          |256KB |2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|
          |------------------------------------------------------------|
          |Note:Pins designated should be in the closed position.      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |   Type   |   J20   |        J21        |        J22        |
          |----------+---------+-------------------+-------------------|
          | 80486SX  | Closed  | pins 1 & 2 closed | pins 1 & 2 closed |
          |----------+---------+-------------------+-------------------|
          | 80487SX  | Closed  | pins 1 & 2 closed | pins 2 & 3 closed |
          |----------+---------+-------------------+-------------------|
          | 80486DX  |  Open   | pins 2 & 3 closed |       Open        |
          +------------------------------------------------------------+