POSITIVE CORPORATION
====================

   PERSONAL COMPUTER SYTEMS SYSTEM BOARD

   Processor    80386SX/80486SX/80487SX (depends on CPU board     
                installed)                                        
   Processor    20/33MHz                                          
   Speed        
   Chip Set     Unidentified                                      
   Max. Onboard 32MB                                              
   DRAM         
   Cache        32/128KB (depends on CPU board installed)         
   BIOS         Unidentified                                      
   Dimensions   254mm x 218mm                                     
   I/O Options  Parallel port, serial ports (2), VGA port, VGA    
                feature connector, floppy drive interface, IDE    
                interface, riser slot, CPU slot                   
   NPU Options  80387SX                                           

<gopher://bitreich.org/I/th99/m/P-R/32936-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | VGA port          |    J2    | External battery |   J17    |
   |-------------------+----------+------------------+----------|
   | Serial port 1     |    J3    | Turbo LED        |   J25    |
   |-------------------+----------+------------------+----------|
   | Serial port 2     |    J4    | IDE interface    |   J26    |
   |                   |          | LED              |          |
   |-------------------+----------+------------------+----------|
   | Parallel port     |    J5    | Auxiliary        |   J27    |
   |                   |          | speaker          |          |
   |-------------------+----------+------------------+----------|
   | VGA feature       |    J7    | Reset switch     |    S1    |
   | connector         |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Floppy drive      |   J11    | Riser Card       |   SL1    |
   | interface         |          |                  |          |
   |-------------------+----------+------------------+----------|
   | IDE interface     |   J12    | CPU slot         |   SL2    |
   |-------------------+----------+------------------+----------|
   | Speaker           |   J16    |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | 256KB - 640KB memory enabled     |   J6   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | 256KB - 640KB memory disabled    |   J6   | pins 1 & 2 |
   |   |                                  |        |    open    |
   |---+----------------------------------+--------+------------|
   |>> | 512KB - 640KB memory enabled     |   J6   | pins 3 & 4 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | 512KB - 640KB memory disabled    |   J6   | pins 3 & 4 |
   |   |                                  |        |    open    |
   |---+----------------------------------+--------+------------|
   |>> | Security disabled                |   J6   | pins 5 & 6 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Security enabled                 |   J6   | pins 5 & 6 |
   |   |                                  |        |    open    |
   |---+----------------------------------+--------+------------|
   |>> | VGA mode select PS/2             |  J10   | pins 5 & 6 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | VGA mode select AT               |  J10   | pins 5 & 6 |
   |   |                                  |        |    open    |
   |---+----------------------------------+--------+------------|
   |>> | Monitor timing select any        |  J10   | pins 7 & 8 |
   |   | monitor timing                   |        |    open    |
   |---+----------------------------------+--------+------------|
   |   | Monitor timing select Multi Sync |  J10   | pins 7 & 8 |
   |   | 1 timing                         |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  J13   |    N/A     |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  J28   |    N/A     |
   |   | alter                            |        |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1   |   Bank 2   |   Bank 3   |
   |-------+-------------+------------+------------+------------|
   | 512KB | (2) 256K x  |    NONE    |    NONE    |    NONE    |
   |       |      9      |            |            |            |
   |-------+-------------+------------+------------+------------|
   |  1MB  | (2) 256K x  | (2) 256K x |    NONE    |    NONE    |
   |       |      9      |     9      |            |            |
   |-------+-------------+------------+------------+------------|
   | 1.5MB | (2) 256K x  | (2) 256K x | (2) 256K x |    NONE    |
   |       |      9      |     9      |     9      |            |
   |-------+-------------+------------+------------+------------|
   |  2MB  | (2) 256K x  | (2) 256K x | (2) 256K x | (2) 256K x |
   |       |      9      |     9      |     9      |     9      |
   |-------+-------------+------------+------------+------------|
   |  2MB  | (2) 1M x 9  |    NONE    |    NONE    |    NONE    |
   |-------+-------------+------------+------------+------------|
   | 2.5MB | (2) 1M x 9  | (2) 256K x |    NONE    |    NONE    |
   |       |             |     9      |            |            |
   |-------+-------------+------------+------------+------------|
   |  3MB  | (2) 256K x  | (2) 256K x | (2) 1M x 9 |    NONE    |
   |       |      9      |     9      |            |            |
   |-------+-------------+------------+------------+------------|
   | 3.5MB | (2) 256K x  | (2) 256K x | (2) 1M x 9 | (2) 256K x |
   |       |      9      |     9      |            |     9      |
   |-------+-------------+------------+------------+------------|
   |  4MB  | (2) 1M x 9  | (2) 1M x 9 |    NONE    |    NONE    |
   |-------+-------------+------------+------------+------------|
   | 4.5MB | (2) 1M x 9  | (2) 1M x 9 | (2) 256K x |    NONE    |
   |       |             |            |     9      |            |
   |-------+-------------+------------+------------+------------|
   |  5MB  | (2) 1M x 9  | (2) 1M x 9 | (2) 256K x | (2) 256K x |
   |       |             |            |     9      |     9      |
   |-------+-------------+------------+------------+------------|
   |  6MB  | (2) 1M x 9  | (2) 1M x 9 | (2) 1M x 9 |    NONE    |
   |-------+-------------+------------+------------+------------|
   | 6.5MB | (2) 1M x 9  | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x |
   |       |             |            |            |     9      |
   |-------+-------------+------------+------------+------------|
   |  8MB  | (2) 1M x 9  | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 |
   |-------+-------------+------------+------------+------------|
   |  8MB  | (2) 4M x 9  |    NONE    |    NONE    |    NONE    |
   |-------+-------------+------------+------------+------------|
   | 8.5MB | (2) 4M x 9  | (2) 256K x |    NONE    |    NONE    |
   |       |             |     9      |            |            |
   |-------+-------------+------------+------------+------------|
   |  9MB  | (2) 256K x  | (2) 256K x | (2) 4M x 9 |    NONE    |
   |       |      9      |     9      |            |            |
   |-------+-------------+------------+------------+------------|
   | 10MB  | (2) 4M x 9  | (2) 1M x 9 |    NONE    |    NONE    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM CONFIGURATION (CON'T)                 |
   |------------------------------------------------------------|
   |  Size  |   Bank 0   |   Bank 1   |   Bank 2   |   Bank 3   |
   |--------+------------+------------+------------+------------|
   |  12MB  | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 |    NONE    |
   |--------+------------+------------+------------+------------|
   |  14MB  | (2) 1M x 9 | (2) 1M x 9 | (2) 4M x 9 | (2) 1M x 9 |
   |--------+------------+------------+------------+------------|
   |  16MB  | (2) 4M x 9 | (2) 4M x 9 |    NONE    |    NONE    |
   |--------+------------+------------+------------+------------|
   | 16.5MB | (2) 4M x 9 | (2) 4M x 9 | (2) 256K x |    NONE    |
   |        |            |            |     9      |            |
   |--------+------------+------------+------------+------------|
   |  17MB  | (2) 4M x 9 | (2) 4M x 9 | (2) 256K x | (2) 256K x |
   |        |            |            |     9      |     9      |
   |--------+------------+------------+------------+------------|
   |  18MB  | (2) 4M x 9 | (2) 4M x 9 | (2) 1M x 9 |    NONE    |
   |--------+------------+------------+------------+------------|
   |  20MB  | (2) 4M x 9 | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 |
   |--------+------------+------------+------------+------------|
   |  24MB  | (2) 4M x 9 | (2) 4M x 9 | (2) 4M x 9 |    NONE    |
   |--------+------------+------------+------------+------------|
   |  32MB  | (2) 4M x 9 | (2) 4M x 9 | (2) 4M x 9 | (2) 4M x 9 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     VRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size        |       Bank 0       |      Bank 1       |
   |-------------------+--------------------+-------------------|
   |       512KB       |       512KB        |       NONE        |
   |-------------------+--------------------+-------------------|
   |        1MB        |       512KB        |       512KB       |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/m/P-R/32936-2.png>
   

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       32KB       |     (2) 8K x 8     |     (2) 8K x 8     |
   |------------------+--------------------+--------------------|
   |      128KB       |    (2) 32K x 8     |    (2) 32K x 8     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |            Size            |              JP1              |
   |----------------------------+-------------------------------|
   |            32KB            |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |           128KB            |       pins 3 & 4 closed       |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/m/P-R/32936-3.png>
   

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Jumper  | Position |
   |---------------------------------------+---------+----------|
   |>> | Factory configured - do not alter |   JP1   |   N/A    |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/m/P-R/32936-4.png>
   

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |        Type        |        JP1        |        JP2        |
   |--------------------+-------------------+-------------------|
   |     80486SX-20     |       Open        |      Closed       |
   |--------------------+-------------------+-------------------|
   |     80486SX-33     |      Closed       |       Open        |
   |--------------------+-------------------+-------------------|
   |     80487SX-20     |      Closed       |       Open        |
   +------------------------------------------------------------+