SOYO COMPUTER CO., LTD.
=======================

   SY-022

                                                                  
   Processor             80486SX/80487SX/80486DX/80486DX2         
   Processor Speed       20/25/33/50(internal)/50/66(internal)MHz 
   Chip Set              SIS                                      
   Max. Onboard DRAM     128MB                                    
   Cache                 64/128/256KB                             
   BIOS                  AMI                                      
   Dimensions            330mm x 218mm                            
   I/O Options           None                                     
   NPU Options           4167                                     
                                                                  

<gopher://bitreich.org/I/th99/m/S-T/31014-1.png>
   

   +------------------------------------------------------------+
   |                        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   |
   |------------------------------------+--------+--------------|
   |>> | 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    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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     |
   |------------------+--------------------+--------------------|
   |       64MB       |    (4) 16M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       80MB       |     (4) 4M x 9     |    (4) 16M x 9     |
   |------------------+--------------------+--------------------|
   |      128MB       |    (4) 16M x 9     |    (4) 16M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1   |    TAG     |    U35     |
   |-------+-------------+------------+------------+------------|
   | 64KB  | (4) 8K x 8  | (4) 8K x 8 | (2) 16K x  | (1) 16K x  |
   |       |             |            |     4      |     4      |
   |-------+-------------+------------+------------+------------|
   | 128KB | (4) 32K x 8 |    NONE    | (2) 16K x  | (1) 16K x  |
   |       |             |            |     4      |     4      |
   |-------+-------------+------------+------------+------------|
   | 256KB | (4) 32K x 8 | (4) 32K x  | (2) 16K x  | (1) 16K x  |
   |       |             |     8      |     4      |     4      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |  Size  |  JP15  |  JP16  |  JP17  |  JP18  | JP19  | JP20  |
   |--------+--------+--------+--------+--------+-------+-------|
   |  64KB  | 1 & 2  | 1 & 2  | 1 & 2  | 1 & 2  | 1 & 2 | 3 & 4 |
   |--------+--------+--------+--------+--------+-------+-------|
   | 128KB  | 1 & 2  | 2 & 3  | 2 & 3  | 2 & 3  | 2 & 3 | 1 & 2 |
   |--------+--------+--------+--------+--------+-------+-------|
   | 256KB  | 2 & 3  | 2 & 3  | 2 & 3  | 2 & 3  | 2 & 3 | 4 & 5 |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type    |       JP12        |       JP13        |  JP14  |
   |-----------+-------------------+-------------------+--------|
   |  80486SX  | pins 2 & 3 closed |       Open        |  Open  |
   |-----------+-------------------+-------------------+--------|
   |  80487SX  | pins 1 & 2 closed | pins 2 & 3 closed |  Open  |
   |-----------+-------------------+-------------------+--------|
   |  80486DX  | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
   |-----------+-------------------+-------------------+--------|
   | 80486DX2  | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
   +------------------------------------------------------------+