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

   SY-020M

                                                                  
   Processor          80486SX/80487SX/80486DX/80486DX2            
   Processor Speed    20/25/33/40/50(internal)/50/66(internal)MHz 
   Chip Set           SIS                                         
   Max. Onboard DRAM  32MB                                        
   Cache              64/128/256KB                                
   BIOS               AMI                                         
   Dimensions         245mm x 220mm                               
   I/O Options        None                                        
   NPU Options        None                                        
                                                                  

<gopher://bitreich.org/I/th99/m/S-T/31016-1.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     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |    Bank 0     |    Bank 1     |      TAG      |
   |------------+---------------+---------------+---------------|
   |    64KB    |  (4) 8K x 8   |  (4) 8K x 8   |  (1) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |   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  | JP21  | JP22  | JP23  | JP24  | JP25 | JP26 | JP27 |
   |-------+-------+-------+-------+-------+------+------+------|
   | 64KB  | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 &  | 1 &  | 2 &  |
   |       |       |       |       |       |  2   |  2   |  3   |
   |-------+-------+-------+-------+-------+------+------+------|
   | 128KB | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 | 2 &  | 1 &  | 1 &  |
   |       |       |       |       |       |  3   |  2   |  2   |
   |-------+-------+-------+-------+-------+------+------+------|
   | 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 &  | 2 &  | 2 &  |
   |       |       |       |       |       |  3   |  3   |  3   |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |     Type     | Oscillator |  JP9  |  JP11  | JP12  | JP13  |
   |              |    OSC1    |       |        |       |       |
   |--------------+------------+-------+--------+-------+-------|
   |  80486SX -   |   40MHz    | 2 & 3 |  Open  | 2 & 3 | 2 & 3 |
   |    20MHz     |            |       |        |       |       |
   |--------------+------------+-------+--------+-------+-------|
   |  80486SX -   |   25MHz    | 1 & 2 |  Open  | 2 & 3 | 2 & 3 |
   |    25MHz     |            |       |        |       |       |
   |--------------+------------+-------+--------+-------+-------|
   |  80487SX -   |   40MHz    | 2 & 3 | Closed | 2 & 3 | 1 & 2 |
   |    20MHz     |            |       |        |       |       |
   |--------------+------------+-------+--------+-------+-------|
   |  80486DX -   |   33MHz    | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
   |    25MHz     |            |       |        |       |       |
   |--------------+------------+-------+--------+-------+-------|
   |  80486DX -   |   33MHz    | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
   |    33MHz     |            |       |        |       |       |
   |--------------+------------+-------+--------+-------+-------|
   |  80486DX -   |   50MHz    | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
   |    50MHz     |            |       |        |       |       |
   |--------------+------------+-------+--------+-------+-------|
   |  80486DX2 -  |   25MHz    | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
   |    50MHz     |            |       |        |       |       |
   |--------------+------------+-------+--------+-------+-------|
   |  80486DX2 -  |   33MHz    | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
   |    66MHz     |            |       |        |       |       |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+