YOUNG MICRO SYSTEMS, INC.
=========================

   VS486F

   Processor         80486SX/80486DX/80486DX2                     
   Processor Speed   25/33/40/50(internal)/66(internal)MHz        
   Chip Set          Symphony                                     
   Max. Onboard DRAM 32MB                                         
   Cache             64/256KB                                     
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       None                                         
   NPU Options       4167                                         

<gopher://bitreich.org/I/th99/m/U-Z/31713-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose             | Location | Purpose        | Location |
   |---------------------+----------+----------------+----------|
   | Speaker             |   CN1    | Turbo LED      |   CN4    |
   |---------------------+----------+----------------+----------|
   | Power LED & keylock |   CN2    | Turbo switch   |   CN5    |
   |---------------------+----------+----------------+----------|
   | Reset switch        |   CN3    |                |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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) 1M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       17MB       |     (4) 4M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 4M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

+----------------------------------------------------------------------------+
|                           CPU TYPE CONFIGURATION                           |
|----------------------------------------------------------------------------|
|  Type  | JP11 | JP10 | JP9  | JP8  | JP7  | JP6  | JP5  | JP4  | JP3  |JP2 |
|--------+------+------+------+------+------+------+------+------+------+----|
|80486SX |Closed| Open | Open | Open | Open |Closed|Closed| Open |Closed|Open|
|--------+------+------+------+------+------+------+------+------+------+----|
|80486DX | Open |Closed|Closed|Closed|Closed| Open |Closed|Closed|Closed|Open|
|--------+------+------+------+------+------+------+------+------+------+----|
|80486DX2|Closed| Open | Open | Open |Closed| Open |Closed|Closed|Closed|Open|
+----------------------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CACHE CONFIGURABLE                     |
   |------------------------------------------------------------|
   |       Size       |       Cache        |        TAG         |
   |------------------+--------------------+--------------------|
   |       64KB       |     (8) 8K x 8     |     (1) 8K x 8     |
   |------------------+--------------------+--------------------|
   |      256KB       |    (8) 32K x 8     |     (1) 8K x 8     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |  JP17  |  JP16  |  JP15  |  JP14  |  JP13  | JP12  |
   |-------+--------+--------+--------+--------+--------+-------|
   | 64KB  | Closed |  Open  | Closed |  Open  | Closed | Open  |
   |-------+--------+--------+--------+--------+--------+-------|
   | 256KB |  Open  | Closed |  Open  | Closed |  Open  |Closed |
   +------------------------------------------------------------+