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

   486DX/SX BOARD

   Processor   80486SX/80487SX/80486DX/ODP486SX/80486DX2          
   Processor   20/25/33/40(internal)/50(internal)/66(internal)MHz 
   Speed       
   Chip Set    OPTI                                               
   Max.        64MB                                               
   Onboard     
   DRAM        
   Cache       None                                               
   BIOS        Award                                              
   Dimensions  330mm x 220mm                                      
   I/O Options None                                               
   NPU Options None                                               

<gopher://bitreich.org/I/th99/m/S-T/30774-1.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        |
   |------------------+--------------------+--------------------|
   |       5MB        |    (4) 256K x 9    |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU CONFIGURATION                      |
   |------------------------------------------------------------|
   |   Type   | JP101  |    JP102     |   JP103    |   JP104    |
   |----------+--------+--------------+------------+------------|
   | 80486SX  |  Open  |  pins 2 & 3  |    Open    | pins 2 & 3 |
   |          |        |    closed    |            |   closed   |
   |----------+--------+--------------+------------+------------|
   | 80487SX  | Closed |  pins 1 & 2  | pins 2 & 3 | pins 2 & 3 |
   |          |        |    closed    |   closed   |   closed   |
   |----------+--------+--------------+------------+------------|
   | ODP486SX | Closed |  pins 1 & 2  | pins 1 & 2 | pins 1 & 2 |
   |          |        |    closed    |   closed   |   closed   |
   |----------+--------+--------------+------------+------------|
   | 80486DX  | Closed |  pins 1 & 2  | pins 1 & 2 | pins 2 & 3 |
   |          |        |    closed    |   closed   |   closed   |
   |----------+--------+--------------+------------+------------|
   | 80486DX2 | Closed |  pins 1 & 2  | pins 1 & 2 | pins 1 & 2 |
   |          |        |    closed    |   closed   |   closed   |
   |------------------------------------------------------------|
   | Note:Board may be factory configured with a surface        |
   | mounted 80486SX.                                           |
   +------------------------------------------------------------+