Quote Originally Posted by Darrel Taylor View Post
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I put together a breadboard with an 18F4620 running at 40Mhz with a 10Mhz crystal and 24 LED's.

It works fine.
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Sayzer was using an 18F452, not an 18F4620, maybe it's a problem with a particular chipset and not the 18F family?

One thought, Sayzer, did you try with another 18F452? That would rule out a defective unit.

And if you want to rule out the breadboard, try it on another one. I've had only one breadboard so far with a defective track in it.

And a really dumb question, did you confirm that power to the circuit was good? Forgetting to readjust the voltage or current on a variable power supply like the one I use could make for freaky results; not saying that I ever did that noob mistake.