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

   PMS486DS

   Processor             80486DX                                  
   Processor Speed       20/25/33/50MHz                           
   Chip Set              OPTI                                     
   Max. Onboard DRAM     32MB                                     
   Cache                 64/128/256/512KB                         
   BIOS                  AMI                                      
   Dimensions            330.2mm x 218.4mm                        
   I/O Options           None                                     
   NPU Options           4167                                     

<gopher://bitreich.org/I/th99/m/U-Z/30257-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |    J3    | Speaker           |   J18    |
   |------------------+----------+-------------------+----------|
   | Turbo switch     |   J16    | Power LED &       |   J19    |
   |                  |          | keylock           |          |
   |------------------+----------+-------------------+----------|
   | Reset switch     |   J17    | Turbo LED         |   J20    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | CMOS memory normal operation   |   J4   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CMOS memory clear              |   J4   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | Monitor type select color      |   J5   |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select monochrome |   J5   |     open     |
   |---+--------------------------------+--------+--------------|
   |>> | CPU speed select iOSC/2        |   J9   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CPU speed select iOSC          |   J9   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Bus speed select ATCLK/6       |  J10   |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Bus speed select ATCLK/4       |  J10   |     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) 256K x 9    |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       17MB       |    (4) 256K x 9    |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Cache    |  Location   | TAG (U42)  | TAG (U55)  |
   |       |   CACHE    |             |            |            |
   |-------+------------+-------------+------------+------------|
   | 64KB  | (8) 8K x 8 |   Bank 0    | (1) 64K x  | (1) 8K x 8 |
   |       |            |             |     1      |            |
   |-------+------------+-------------+------------+------------|
   | 128KB | (16) 8K x  | Banks 0 & 1 | (1) 64K x  | (1) 8K x 8 |
   |       |     8      |             |     1      |            |
   |-------+------------+-------------+------------+------------|
   | 256KB | (8) 32K x  |   Bank 0    | (1) 64K x  | (1) 32K x  |
   |       |     8      |             |     1      |     8      |
   |-------+------------+-------------+------------+------------|
   | 512KB | (16) 32K x | Banks 0 & 1 | (1) 64K x  | (1) 32K x  |
   |       |     8      |             |     1      |     8      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |  J11   |  J12   |  J13   |  J14   |      J15       |
   |-------+--------+--------+--------+--------+----------------|
   | 64KB  |  open  |  open  |  open  |  open  |   pins 2 & 3   |
   |       |        |        |        |        |     closed     |
   |-------+--------+--------+--------+--------+----------------|
   | 128KB |  open  |  open  | closed | closed |   pins 2 & 3   |
   |       |        |        |        |        |     closed     |
   |-------+--------+--------+--------+--------+----------------|
   | 256KB |  open  | closed | closed | closed |   pins 2 & 3   |
   |       |        |        |        |        |     closed     |
   |-------+--------+--------+--------+--------+----------------|
   | 512KB | closed | closed | closed | closed |   pins 1 & 2   |
   |       |        |        |        |        |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   |   CPU   |        J6         |    J7    |        J8         |
   |---------+-------------------+----------+-------------------|
   | 80486DX | pins 1 & 2 closed |  closed  | pins 2 & 3 closed |
   |---------+-------------------+----------+-------------------|
   | 80487SX | pins 2 & 3 closed |  closed  | pins 2 & 3 closed |
   |---------+-------------------+----------+-------------------|
   | 80486SX |       open        |   open   | pins 1 & 2 closed |
   +------------------------------------------------------------+