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

   PC425

   Processor    80486SX                                           
   Processor    25MHz                                             
   Speed        
   Chip Set     Unidentified                                      
   Max. Onboard 5MB                                               
   DRAM         
   Cache        None                                              
   BIOS         Unidentified                                      
   Dimensions   254mm x 218mm                                     
   I/O Options  Parallel port, serial ports (2), VGA port, floppy 
                drive interface, IDE interface, riser slot        
   NPU Options  None                                              

<gopher://bitreich.org/I/th99/m/P-R/32928-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | Serial port 2    |    J2    | External battery  |   J12    |
   |------------------+----------+-------------------+----------|
   | Serial port 1    |    J3    | Power/speed       |   J17    |
   |                  |          | indicator         |          |
   |------------------+----------+-------------------+----------|
   | Parallel port    |    J4    | VGA port          |   J22    |
   |------------------+----------+-------------------+----------|
   | Speaker          |    J6    | Riser Card        |   SL1    |
   |------------------+----------+-------------------+----------|
   | Floppy drive     |   J10    | Reset switch      |   SW1    |
   | interface        |          |                   |          |
   |------------------+----------+-------------------+----------|
   | IDE interface    |   J11    |                   |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |           Function            | Jumper/Switch |  Position  |
   |-------------------------------+---------------+------------|
   |>> | Factory configured - do   |      E1       | pins 2 & 3 |
   |   | not alter                 |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | IDE interface interrupt   |      E2       | pins 1 & 2 |
   |   | enabled                   |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | IDE interface interrupt   |      E2       |    Open    |
   |   | disabled                  |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E3       | pins 2 & 3 |
   |   | not alter                 |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E4       | pins 2 & 3 |
   |   | not alter                 |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E5       | pins 2 & 3 |
   |   | not alter                 |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E8       | pins 1 & 2 |
   |   | not alter                 |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E9       | pins 2 & 3 |
   |   | not alter                 |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Parity disabled           |      E10      | pins 2 & 3 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Parity enabled            |      E10      | pins 1 & 2 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E11      | pins 2 & 3 |
   |   | not alter                 |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Onboard RAM 256KB to      |     sw2/1     |    Off     |
   |   | 512KB enabled             |               |            |
   |---+---------------------------+---------------+------------|
   |   | Onboard RAM 256KB to      |     sw2/1     |     On     |
   |   | 512KB disabled            |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Onboard RAM 512KB to      |     sw2/2     |    Off     |
   |   | 640KB enabled             |               |            |
   |---+---------------------------+---------------+------------|
   |   | Onboard RAM 512KB to      |     sw2/2     |     On     |
   |   | 640KB disabled            |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Security enabled          |     sw2/3     |    Off     |
   |---+---------------------------+---------------+------------|
   |   | Security disabled         |     sw2/3     |     On     |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |     sw2/4     |    Off     |
   |   | not alter                 |               |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |      Size       |      Bank 0       |        Bank 1        |
   |-----------------+-------------------+----------------------|
   |       1MB       |        1MB        |         NONE         |
   |-----------------+-------------------+----------------------|
   |       5MB       |        1MB        |      (4) 1M x 9      |
   |------------------------------------------------------------|
   | Note: Bank 0 is factory installed and is not configurable. |
   | The location is unidentified.                              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     IDE CONFIGURATION                      |
   |------------------------------------------------------------|
   |     Setting      |         E6         |         E7         |
   |------------------+--------------------+--------------------|
   |     Primary      | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |    Secondary     | pins 1 & 2 closed  | pins 1 & 2 closed  |
   +------------------------------------------------------------+