The KPCI-PDISO8A has a dedicated input and output port which cannot be dynamically 
configured.

The ports are defined as follows:

    Physical port		Logical port
---------------------		------------
Input A (IP0 - IP7)		 Channel 0
Output A` (OP0 - OP7)		 Channel 1


If you do not wish to use the external interrupt feature of this board, do not jumper
pins 3 and 21 (IP7) to ground.  If you do use the external interrupt feature of this board,
IP6 and IP7 can no longer be used as inputs and must be masked from any value read by this
port.