Probably....but the main thing would be to put some sort of counter on it, 'scope, freq-meter, anything and write a program to see how fast the clock is really going.
Failing that, write a program that counts up in seconds. Let it run for a few hours, compare it with a stopwatch and see how far off it is. Maybe it's actually so far out in the weeds that you can't even get into the ball park.
What happens if you write a program to toggle an LED on and off once per second? Does it actually toggle once per second?
Did you smoke the PC's serial port? Have the right COM1 port selected, etc.?
Simple little things...we all know how it goes...but ya never know..could be something stupid that's tripping you up...





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