UNIDENTIFIED
============

   ISA-S486

   Processor         80486SX/80486DX                              
   Processor Speed   16/20/25/33/50MHz                            
   Chip Set          OPTI                                         
   Max. Onboard DRAM 32MB                                         
   Cache             64/128/256/1024KB                            
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       None                                         
   NPU Options       4167                                         

<gopher://bitreich.org/I/th99/m/U-Z/32204-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   JP5    | Speaker          |   JP16   |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Turbo switch      |   JP10   | External battery |   JP17   |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |   JP11   | Reset switch     |   JP19   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper  | Position  |
   |--------------------------------------+---------+-----------|
   |>> | Monitor type select color        |   JP6   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |   | Monitor type select monochrome   |   JP6   |   Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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    |
   |------------------+--------------------+--------------------|
   |       5MB        |    (4) 256K x 9    |     (4) 1M 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    |
   |------------------+--------------------+--------------------|
   |       17MB       |    (4) 256K x 9    |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 4M x 9     |     (4) 1M 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) 32K x 8  |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
   |------------+---------------+---------------+---------------|
   |    1MB     | (4) 128K x 8  | (4) 128K x 8  | (1) 128K x 8  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |   Size   |   JP22   |   JP23   |  JP24   |  JP25  |  JP34  |
   |----------+----------+----------+---------+--------+--------|
   |   64KB   |  1 & 2   |  1 & 2   |  1 & 2  | 1 & 2  | 1 & 2  |
   |----------+----------+----------+---------+--------+--------|
   |  128KB   |  1 & 2   |  1 & 2   |  1 & 2  | 1 & 2  | 1 & 2  |
   |----------+----------+----------+---------+--------+--------|
   |  256KB   |  2 & 3   |  2 & 3   |  2 & 3  | 2 & 3  | 2 & 3  |
   |----------+----------+----------+---------+--------+--------|
   |   1MB    |  2 & 3   |  2 & 3   |  2 & 3  | 2 & 3  | 2 & 3  |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |           JP100           |         JP101          |
   |-------+---------------------------+------------------------|
   | 64KB  | 2 & 4, 6 & 8, 10 & 12, 14 | 2 & 4, 6 & 8, 10 & 12, |
   |       |           & 16            |        14 & 16         |
   |-------+---------------------------+------------------------|
   | 128KB | 1 & 3, 5 & 7, 9 & 11, 13  | 1 & 3, 5 & 7, 9 & 11,  |
   |       |           & 15            |        13 & 15         |
   |-------+---------------------------+------------------------|
   | 256KB | 2 & 4, 6 & 8, 10 & 12, 14 | 2 & 4, 6 & 8, 10 & 12, |
   |       |           & 16            |        14 & 16         |
   |-------+---------------------------+------------------------|
   |  1MB  | 2 & 4, 6 & 8, 10 & 12, 14 | 2 & 4, 6 & 8, 10 & 12, |
   |       |           & 16            |        14 & 16         |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

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