National Instruments AT-232/2 Getting Started page 35

Chapter 3 Configuration
Note:
Serial for Windows NT
Figure 3-5. PnP Port Configuration Dialog Box for the AT-232/4
Each shared IRQ AT board requires multiple base I/O settings (one for
each port) and one IRQ that is shared between the ports.
Input/Output Range:
Interrupt Request:
The niports utility informs you if your resources conflict with the
resources of any other interface in the system. It does not check for
conflicts with ports on the same board. Make sure to assign resources
that do not conflict with those assigned to another port on the same
board.
Each Input/Output Range listing
displays the I/O address ranges
assigned to the corresponding port on
the board.
The IRQ shared between the ports on
the board.
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