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

   VS3486F/S-3VL

   Processor         80386DX/80486DLC/80486SX/80486DX/80486DX2    
   Processor Speed   25/33/40/50(internal)/50/66MHz               
   Chip Set          Symphony                                     
   Max. Onboard DRAM 32MB                                         
   Cache             64/256/1024KB                                
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       None                                         
   NPU Options       80387DX/80487SX                              

<gopher://bitreich.org/I/th99/m/U-Z/31714-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose        | Location | Purpose             | Location |
   |----------------+----------+---------------------+----------|
   | Turbo switch   |   CN1    | Power LED & keylock |   CN4    |
   |----------------+----------+---------------------+----------|
   | Turbo LED      |   CN2    | Speaker             |   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   | JP24 |JP25 |JP28 |JP32 |JP33 |JP34 | JP35 | JP36 |
   |---------+------+-----+-----+-----+-----+-----+------+------|
   | 80386DX |2 & 3 |1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|Closed|Closed|
   |---------+------+-----+-----+-----+-----+-----+------+------|
   | 80486SX |2 & 3 |2 & 3|2 & 3|2 & 3|2 & 3|2 & 3| Open | Open |
   |---------+------+-----+-----+-----+-----+-----+------+------|
   |80486DLC |2 & 3 |1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|Closed|Closed|
   |------------------------------------------------------------|
   |Note:Pins designated should be in the closed position.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |  Type   |JP37 |JP38 | JP39 |JP40 |JP41 |JP42 | JP43 | JP44 |
   |---------+-----+-----+------+-----+-----+-----+------+------|
   | 80386DX |Open |Open |Closed|Open |Open |Open | Open |1 & 2 |
   |---------+-----+-----+------+-----+-----+-----+------+------|
   | 80486SX |Open |Open | Open |Open |Open |Open |Closed|2 & 3 |
   |---------+-----+-----+------+-----+-----+-----+------+------|
   |80486DLC |Open |Open |Closed|Open |Open |Open | Open |1 & 2 |
   |------------------------------------------------------------|
   |Note:Pins designated should be in the closed position.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |  Speed  | JP24 | JP25 | JP28 | JP32 | JP33 |JP34 |JP35|JP36|
   |---------+------+------+------+------+------+-----+----+----|
   |  25MHz  |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
   |---------+------+------+------+------+------+-----+----+----|
   |  33MHz  |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
   |---------+------+------+------+------+------+-----+----+----|
   | 50i MHz |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
   |---------+------+------+------+------+------+-----+----+----|
   |  50MHz  |1 & 2 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
   |---------+------+------+------+------+------+-----+----+----|
   | 66i MHz |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
   |------------------------------------------------------------|
   |Note:Pins designated should be in the closed position.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   | Speed  | JP37 | JP38 |JP39 | JP40 | JP41 | JP42 |JP43|JP44 |
   |--------+------+------+-----+------+------+------+----+-----|
   | 25MHz  | Open | Open |Open |Closed|Closed|Closed|Open|2 & 3|
   |--------+------+------+-----+------+------+------+----+-----|
   | 33MHz  | Open | Open |Open |Closed|Closed|Closed|Open|2 & 3|
   |--------+------+------+-----+------+------+------+----+-----|
   |50I MHz | Open | Open |Open |Closed|Closed|Closed|Open|2 & 3|
   |--------+------+------+-----+------+------+------+----+-----|
   | 50MHz  |Closed|Closed|Open | Open |Closed|Closed|Open|2 & 3|
   |--------+------+------+-----+------+------+------+----+-----|
   |66I MHz | Open | Open |Open |Closed|Closed|Closed|Open|2 & 3|
   |------------------------------------------------------------|
   |Note:Pins designated should be in the closed position.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |            Size            |             Cache             |
   |----------------------------+-------------------------------|
   |            64KB            |          (9) 8K x 8           |
   |----------------------------+-------------------------------|
   |           256KB            |          (9) 32K x 8          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |      JP26       |      JP27       |      JP31      |
   |-------+-----------------+-----------------+----------------|
   | 64KB  |   pins 1 & 2    |   pins 1 & 2    |   pins 1 & 2   |
   |       |     closed      |     closed      |     closed     |
   |-------+-----------------+-----------------+----------------|
   | 256KB |   pins 2 & 3    |   pins 2 & 3    |   pins 2 & 3   |
   |       |     closed      |     closed      |     closed     |
   +------------------------------------------------------------+