(TXT) View Source
       
       # SOYO COMPUTER CO., LTD.
       
          SY-020H
       
                                                                         
          Processor       80486SX/80487SX/80486DX                        
          Processor Speed 16/20/25/33/40/50(internal)/50/66(internal)MHz 
          Chip Set        SIS                                            
          Max. Onboard    32MB                                           
          DRAM            
          Cache           32/64/128/256KB                                
          BIOS            AMI                                            
          Dimensions      245mm x 220mm                                  
          I/O Options     None                                           
          NPU Options     4167                                           
                                                                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose        | Location  | Purpose           | Location  |
          |----------------+-----------+-------------------+-----------|
          | Power LED &    |    J17    | External battery  |    J20    |
          | keylock        |           |                   |           |
          |----------------+-----------+-------------------+-----------|
          | Speaker        |    J18    | Turbo switch      |    J21    |
          |----------------+-----------+-------------------+-----------|
          | Reset switch   |    J19    | Turbo LED         |    J22    |
          |------------------------------------------------------------|
          | Note:The oscillator at OSC1 must match the external speed  |
          | of the CPU installed.                                      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper |  Position  |
          |--------------------------------------+--------+------------|
          | » | Monitor type select monochrome   |  JP3   |    Open    |
          |---+----------------------------------+--------+------------|
          |   | Monitor type select color        |  JP3   |   Closed   |
          |---+----------------------------------+--------+------------|
          | » | CMOS memory normal operation     |  JP5   | pins 1 & 2 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | CMOS memory clear                |  JP5   | pins 2 & 3 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Power good signal detect from    |  JP7   | pins 1 & 2 |
          |   | board                            |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | Power good signal detect from    |  JP7   | pins 2 & 3 |
          |   | power supply                     |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Keyboard BIOS clock source       |  JP18  | pins 1 & 2 |
          |   | select programmable timer        |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | Keyboard BIOS clock source       |  JP18  | pins 2 & 3 |
          |   | select 7MHz                      |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | CPU speed select ³ to 25MHz      |  JP19  | pins 1 & 2 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | CPU speed select < 25MHz         |  JP19  | pins 2 & 3 |
          |   |                                  |        |   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     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |    Size    |    Bank 0     |    Bank 1     |      TAG      |
          |------------+---------------+---------------+---------------|
          |    32KB    |  (4) 8K x 8   |     NONE      |  (2) 4K x 4   |
          |------------+---------------+---------------+---------------|
          |    64KB    |  (4) 8K x 8   |  (4) 8K x 8   |  (2) 4K x 4   |
          |------------+---------------+---------------+---------------|
          |   128KB    |  (4) 32K x 8  |     NONE      |  (2) 16K x 4  |
          |------------+---------------+---------------+---------------|
          |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (2) 16K x 4  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size | JP8 | JP9 |JP10 |JP11 |JP12 |JP13 |JP14 |JP15 |JP16 |
          |------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
          | 32KB |1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|
          |------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
          | 64KB |2 & 3|1 & 2|1 & 2|2 & 3|1 & 2|1 & 2|2 & 3|2 & 3|1 & 2|
          |------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
          |128KB |2 & 3|2 & 3|1 & 2|2 & 3|2 & 3|1 & 2|1 & 2|1 & 2|2 & 3|
          |------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
          |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 CONFIGURATION                      |
          |------------------------------------------------------------|
          |   Type   |       JP24        |  JP25   |       JP26        |
          |----------+-------------------+---------+-------------------|
          | 80486SX  | pins 2 & 3 closed |  Open   |       Open        |
          |----------+-------------------+---------+-------------------|
          | 80487SX  | pins 1 & 2 closed | Closed  | pins 2 & 3 closed |
          |----------+-------------------+---------+-------------------|
          | 80486DX  | pins 1 & 2 closed | Closed  | pins 1 & 2 closed |
          +------------------------------------------------------------+