BOCA RESEARCH, INC.
===================

   IOAT55

   Card Type          Multi I/O card                              
   Chipset/Controller 16C550                                      
   I/O Options        Parallel port, serial ports (2)             
   Maximum DRAM       N/A                                         

<gopher://bitreich.org/I/th99/i/A-B/50391-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |      Purpose      | Location |     Purpose      | Location |
   |-------------------+----------+------------------+----------|
   | Serial port 1     |   CN1    | Serial port 2    |   CN3    |
   |-------------------+----------+------------------+----------|
   | Parallel port     |   CN2    |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SERIAL PORT CONFIGURATION                  |
   |------------------------------------------------------------|
   |   Port 1   |        J5        |  Port 2  |       J5        |
   |   (CN1)    |                  |  (CN3)   |                 |
   |------------+------------------+----------+-----------------|
   |>> |  COM1  |   Pins 13 & 14   |   COM2   |   Pins 2 & 3    |
   |   |        |      closed      |          |     closed      |
   |---+--------+------------------+----------+-----------------|
   |   |  COM2  |   Pins 14 & 15   |   COM1   |   Pins 1 & 2    |
   |   |        |      closed      |          |     closed      |
   |---+--------+------------------+----------+-----------------|
   |   |  COM3  |   Pins 16 & 17   |   COM3   |   Pins 4 & 5    |
   |   |        |      closed      |          |     closed      |
   |---+--------+------------------+----------+-----------------|
   |   |  COM4  |   Pins 17 & 18   |   COM4   |   Pins 5 & 6    |
   |   |        |      closed      |          |     closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                SERIAL PORT INTERRUPT SELECT                |
   |------------------------------------------------------------|
   |   Port 1   |        J5        |  Port 2  |       J5        |
   |   (CN1)    |                  |  (CN3)   |                 |
   |------------+------------------+----------+-----------------|
   |>> |  IRQ4  |   Pins 22 & 23   |   IRQ3   |  Pins 11 & 12   |
   |   |        |      closed      |          |     closed      |
   |---+--------+------------------+----------+-----------------|
   |   |  IRQ3  |   Pins 23 & 24   |   IRQ4   |  Pins 10 & 11   |
   |   |        |      closed      |          |     closed      |
   |---+--------+------------------+----------+-----------------|
   |   |  IRQ5  |   Pins 20 & 21   |   IRQ5   |   Pins 8 & 9    |
   |   |        |      closed      |          |     closed      |
   |---+--------+------------------+----------+-----------------|
   |   |  IRQ7  |   Pins 19 & 20   |   IRQ7   |   Pins 7 & 8    |
   |   |        |      closed      |          |     closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                PARALLEL PORT CONFIGURATION                 |
   |------------------------------------------------------------|
   |             LPT             |              J4              |
   |-----------------------------+------------------------------|
   |>>  |           1            |      Pins 1 & 2 closed       |
   |----+------------------------+------------------------------|
   |    |           2            |      Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               PARALLEL PORT INTERRUPT SELECT               |
   |------------------------------------------------------------|
   |            IRQ             |              J4               |
   |----------------------------+-------------------------------|
   |>>  |         IRQ7          |       Pins 4 & 5 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ5          |       Pins 5 & 6 closed       |
   +------------------------------------------------------------+