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       # SOYO COMPUTER CO., LTD.
       
          80486 DX/SX CACHE
       
          Processor             80486SX/80487SX/80486DX/80486DX2         
          Processor Speed       25/33/50(internal)/50/66(internal)MHz    
          Chip Set              ETEQ                                     
          Max. Onboard DRAM     32MB                                     
          Cache                 64/256KB                                 
          BIOS                  AMI                                      
          Dimensions            220mm x 218mm                            
          I/O Options           None                                     
          NPU Options           None                                     
       
 (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    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper |  Position  |
          |--------------------------------------+--------+------------|
          | » | Factory configured - do not      |   J4   |    Open    |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  J12   | pins 1 & 2 |
          |   | alter                            |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  J13   | pins 2 & 3 |
          |   | alter                            |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  J23   | pins 2 & 3 |
          |   | alter                            |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Monitor type select color        |  JP3   |   Closed   |
          |---+----------------------------------+--------+------------|
          |   | Monitor type select monochrome   |  JP3   |    Open    |
          |---+----------------------------------+--------+------------|
          | » | CMOS memory normal operation     |  JP5   | pins 1 & 2 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | CMOS memory clear                |  JP5   | pins 2 & 3 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  JP6   | pins 1 & 2 |
          |   | alter                            |        |   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        |
          |------------------+--------------------+--------------------|
          |       5MB        |    (4) 256K x 9    |     (4) 1M x 9     |
          |------------------+--------------------+--------------------|
          |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
          |------------------+--------------------+--------------------|
          |       16MB       |     (4) 4M x 9     |        NONE        |
          |------------------+--------------------+--------------------|
          |       17MB       |    (4) 256K x 9    |     (4) 4M x 9     |
          |------------------+--------------------+--------------------|
          |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
          |------------------+--------------------+--------------------|
          |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |        TAG         |
          |------------------+--------------------+--------------------|
          |       64KB       |     (8) 8K x 8     |     (1) 8K x 8     |
          |------------------+--------------------+--------------------|
          |      256KB       |    (8) 32K x 8     |    (1) 32K x 8     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |   Size   |   J5    |   J6    |   J7    |   J8    |   J9    |
          |----------+---------+---------+---------+---------+---------|
          |   64KB   |  1 & 2  |  1 & 2  |  Open   |  Open   |  Open   |
          |----------+---------+---------+---------+---------+---------|
          |  256KB   |  2 & 3  |  2 & 3  | Closed  | Closed  | Closed  |
          |------------------------------------------------------------|
          | Note: Pins designated should be in the closed position.    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |    Type     |    J10    |    J11    |    J15    |   J16    |
          |-------------+-----------+-----------+-----------+----------|
          |  80486SX -  | pins 1 &  |   Open    | pins 2 &  | pins 2 & |
          |    25MHz    | 2 closed  |           | 3 closed  | 3 closed |
          |-------------+-----------+-----------+-----------+----------|
          |  80487SX -  | pins 1 &  | pins 2 &  | pins 2 &  | pins 1 & |
          |    25MHz    | 2 closed  | 3 closed  | 3 closed  | 2 closed |
          |-------------+-----------+-----------+-----------+----------|
          |  80487SX -  | pins 1 &  | pins 2 &  | pins 2 &  | pins 1 & |
          |    33MHz    | 2 closed  | 3 closed  | 3 closed  | 2 closed |
          |-------------+-----------+-----------+-----------+----------|
          |  80486DX -  | pins 1 &  | pins 1 &  | pins 2 &  | pins 1 & |
          |    33MHz    | 2 closed  | 2 closed  | 3 closed  | 2 closed |
          |-------------+-----------+-----------+-----------+----------|
          |  80486DX -  | pins 1 &  | pins 1 &  | pins 1 &  | pins 1 & |
          |    50MHz    | 2 closed  | 2 closed  | 2 closed  | 2 closed |
          |-------------+-----------+-----------+-----------+----------|
          | 80486DX2 -  | pins 2 &  | pins 1 &  | pins 1 &  | pins 1 & |
          |    50MHz    | 3 closed  | 2 closed  | 2 closed  | 2 closed |
          |-------------+-----------+-----------+-----------+----------|
          | 80486DX2 -  | pins 2 &  | pins 1 &  | pins 1 &  | pins 1 & |
          |    66MHz    | 3 closed  | 2 closed  | 2 closed  | 2 closed |
          |------------------------------------------------------------|
          | Note:Oscillator at Y1 must match the external speed of the |
          | CPU installed.                                             |
          +------------------------------------------------------------+