Thank you to everyone for their thought answers and insights, they gave me some great ideas. I was thinking about the parallel port polling idea, but then my son wanted to measure the relation between temperature and XO frequency, so we needed microsecond resolution.
tvb came up with just the perfect solution: - Cheap, $5 per part - Easy for my son to construct, an 8-pin PIC and a bypass capacitor for each PPS line - Easy to analyze results, one ASCII text line for each input pulse - Continuously counting indefinitely - sub-microsecond resolution (useful for measuring tempc for an XO) Thanks again to everyone for their good thoughts and valuable time spent considering my question. Kevin _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.