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       # SEALEVEL SYSTEMS, INC.
       
          C4-104
       
          Card Type           Serial card                                
          Chip Set            Unidentified                               
          I/O Options         Serial ports (4), PC/104 connectors (2)    
          Data Bus            Unidentified                               
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |    Function    | Label |         Function          | Label |
          |----------------+-------+---------------------------+-------|
          | Serial port    |  J1   | Serial port               |  J4   |
          |----------------+-------+---------------------------+-------|
          | Serial port    |  J2   | PC/104 connector (8-bit)  |  P1   |
          |----------------+-------+---------------------------+-------|
          | Serial port    |  J3   | PC/104 connector (16-bit) |  P2   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | » | Factory configured – do not     |  E5   | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured – do not     |  E6   | Unidentified |
          |   | alter                           |       |              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               SERIAL PORT ADDRESS SELECTION                |
          |------------------------------------------------------------|
          | Port 1 |Port 2 |Port 3 |Port 4 |SW1/1 |SW1/2 |SW1/3 |SW1/4 |
          |--------+-------+-------+-------+------+------+------+------|
          |» | 3F8 |  2F8  |  3E8  |  2E8  |  On  |  On  |  On  |  On  |
          |--+-----+-------+-------+-------+------+------+------+------|
          |  | 2F8 |  3E8  |  2E8  |  2E0  |  On  |  On  |  On  | Off  |
          |--+-----+-------+-------+-------+------+------+------+------|
          |  | 3E8 |  2E8  |  280  |  288  |  On  |  On  | Off  |  On  |
          |--+-----+-------+-------+-------+------+------+------+------|
          |  | 280 |  288  |  290  |  298  |  On  |  On  | Off  | Off  |
          |--+-----+-------+-------+-------+------+------+------+------|
          |  | 2A0 |  2A8  |  2B0  |  2B8  |  On  | Off  |  On  |  On  |
          |--+-----+-------+-------+-------+------+------+------+------|
          |  | 500 |  508  |  510  |  518  |  On  | Off  |  On  | Off  |
          |--+-----+-------+-------+-------+------+------+------+------|
          |  | 580 |  588  |  590  |  598  |  On  | Off  | Off  |  On  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             SERIAL PORT 1 INTERRUPT SELECTION              |
          |------------------------------------------------------------|
          |            IRQ             |              E1               |
          |----------------------------+-------------------------------|
          |            |      2/9      |       Pins 1 & 2 closed       |
          |------------+---------------+-------------------------------|
          |            |       3       |       Pins 3 & 4 closed       |
          |------------+---------------+-------------------------------|
          |            |       4       |       Pins 5 & 6 closed       |
          |------------+---------------+-------------------------------|
          |            |       5       |       Pins 7 & 8 closed       |
          |------------+---------------+-------------------------------|
          |            |       7       |      Pins 9 & 10 closed       |
          |------------+---------------+-------------------------------|
          |            |      10       |      Pins 11 & 12 closed      |
          |------------+---------------+-------------------------------|
          |            |      11       |      Pins 13 & 14 closed      |
          |------------+---------------+-------------------------------|
          |            |      12       |      Pins 15 & 16 closed      |
          |------------+---------------+-------------------------------|
          |            |      15       |      Pins 17 & 18 closed      |
          |------------+---------------+-------------------------------|
          | »          |       R       |      Pins 19 & 20 closed      |
          |------------------------------------------------------------|
          | Note: IRQ R connects a 1k ohm pull down resistor to allow  |
          | multiple ports to share a single IRQ.                      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             SERIAL PORT 2 INTERRUPT SELECTION              |
          |------------------------------------------------------------|
          |            IRQ             |              E2               |
          |----------------------------+-------------------------------|
          |     |         2/9          |       Pins 1 & 2 closed       |
          |-----+----------------------+-------------------------------|
          |     |          3           |       Pins 3 & 4 closed       |
          |-----+----------------------+-------------------------------|
          |     |          4           |       Pins 5 & 6 closed       |
          |-----+----------------------+-------------------------------|
          |     |          5           |       Pins 7 & 8 closed       |
          |-----+----------------------+-------------------------------|
          |     |          7           |      Pins 9 & 10 closed       |
          |-----+----------------------+-------------------------------|
          |     |          10          |      Pins 11 & 12 closed      |
          |-----+----------------------+-------------------------------|
          |     |          11          |      Pins 13 & 14 closed      |
          |-----+----------------------+-------------------------------|
          |     |          12          |      Pins 15 & 16 closed      |
          |-----+----------------------+-------------------------------|
          |     |          15          |      Pins 17 & 18 closed      |
          |-----+----------------------+-------------------------------|
          | »   |          R           |      Pins 19 & 20 closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             SERIAL PORT 3 INTERRUPT SELECTION              |
          |------------------------------------------------------------|
          |            IRQ             |              E3               |
          |----------------------------+-------------------------------|
          |     |         2/9          |       Pins 1 & 2 closed       |
          |-----+----------------------+-------------------------------|
          |     |          3           |       Pins 3 & 4 closed       |
          |-----+----------------------+-------------------------------|
          |     |          4           |       Pins 5 & 6 closed       |
          |-----+----------------------+-------------------------------|
          |     |          5           |       Pins 7 & 8 closed       |
          |-----+----------------------+-------------------------------|
          |     |          7           |      Pins 9 & 10 closed       |
          |-----+----------------------+-------------------------------|
          |     |          10          |      Pins 11 & 12 closed      |
          |-----+----------------------+-------------------------------|
          |     |          11          |      Pins 13 & 14 closed      |
          |-----+----------------------+-------------------------------|
          |     |          12          |      Pins 15 & 16 closed      |
          |-----+----------------------+-------------------------------|
          |     |          15          |      Pins 17 & 18 closed      |
          |-----+----------------------+-------------------------------|
          | »   |          R           |      Pins 19 & 20 closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             SERIAL PORT 4 INTERRUPT SELECTION              |
          |------------------------------------------------------------|
          |            IRQ             |              E4               |
          |----------------------------+-------------------------------|
          |     |         2/9          |       Pins 1 & 2 closed       |
          |-----+----------------------+-------------------------------|
          |     |          3           |       Pins 3 & 4 closed       |
          |-----+----------------------+-------------------------------|
          |     |          4           |       Pins 5 & 6 closed       |
          |-----+----------------------+-------------------------------|
          |     |          5           |       Pins 7 & 8 closed       |
          |-----+----------------------+-------------------------------|
          |     |          7           |      Pins 9 & 10 closed       |
          |-----+----------------------+-------------------------------|
          |     |          10          |      Pins 11 & 12 closed      |
          |-----+----------------------+-------------------------------|
          |     |          11          |      Pins 13 & 14 closed      |
          |-----+----------------------+-------------------------------|
          |     |          12          |      Pins 15 & 16 closed      |
          |-----+----------------------+-------------------------------|
          |     |          15          |      Pins 17 & 18 closed      |
          |-----+----------------------+-------------------------------|
          | »   |          R           |      Pins 19 & 20 closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  SERIAL PORT 1 SELECTION                   |
          |------------------------------------------------------------|
          |            Setting            |             E7             |
          |-------------------------------+----------------------------|
          |        RS-485 enabled         |     Pins 1 & 2 closed      |
          |-------------------------------+----------------------------|
          |     RS-485 echo disabled      |     Pins 3 & 4 closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  SERIAL PORT 2 SELECTION                   |
          |------------------------------------------------------------|
          |            Setting            |             E7             |
          |-------------------------------+----------------------------|
          |        RS-485 enabled         |     Pins 5 & 6 closed      |
          |-------------------------------+----------------------------|
          |     RS-485 echo disabled      |     Pins 7 & 8 closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  SERIAL PORT 3 SELECTION                   |
          |------------------------------------------------------------|
          |            Setting            |             E8             |
          |-------------------------------+----------------------------|
          |        RS-485 enabled         |     Pins 1 & 2 closed      |
          |-------------------------------+----------------------------|
          |     RS-485 echo disabled      |     Pins 3 & 4 closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  SERIAL PORT 4 SELECTION                   |
          |------------------------------------------------------------|
          |            Setting            |             E8             |
          |-------------------------------+----------------------------|
          |        RS-485 enabled         |     Pins 5 & 6 closed      |
          |-------------------------------+----------------------------|
          |     RS-485 echo disabled      |     Pins 7 & 8 closed      |
          +------------------------------------------------------------+