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        COM1Irq=<number>

 COM2Irq=<number>
 COM3Irq=<number>
 COM4Irq=<number>
   Default: COM1Irq=4; COM2Irq=3; COM3Irq=4; COM4Irq=3
   Purpose: Specifies which interrupt line is being used by
            the device on the specified communications port.
            Check your hardware documentation for the
            appropriate value. Setting a value to -1 disables
            input for that COM port. You would do this only
            if there is a hardware conflict between ports.
   To change: Use Notepad to edit the SYSTEM.INI file.