>The displayed seconds seem correct, but after observing the display for a
>some
>time (10 minutes), the 'clock' seems to run slow.

Why not just put the LED back in place, delete the code you added, and run a
stopwatch simultaneously to check the LED timing.  You can make the counter
overflow to whatever you want to make it ~20 minutes or so.  Set the time,
come back in 20 minutes and see if the LED comes on.  Of course, you'll have
to make a counter with 3 bytes to get the 20 minutes (20 * 60 * 1000 =
0x124F80).  Check the stopwatch to see the difference.  If it's still off by
4-6 seconds, your LED 7-segment display code isn't likely to be the culprit.

--Andrew

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