If my "blinky" is any indication, it works fine for INT_INT, which is the only one I'm using at the moment. I also tested it (INT_INT) in the full program, and it is working, both on the output and driving a "heartbeat" indicator at the same time. (It's a zero-crossing detector.)

The rest of the program is problematic. As I mentioned, it worked on the 16F88, but only one channel works correctly on the 16F1827. I have to assume I have overlooked something in terms of managing and/or definining pins/ports, since each channel's code is identical.

I may be yelling for help yet this evening.