> I programmed the PIC16C74A one time and from then i couldn't program it.
> Is there a possibility that it can be programmed only once?

Yup, just like is says in the data sheet, line card, and probably several
other places.  For the non-flash parts, you have to get the UV erasable
versions if you want to re-program them.  These are usually indicated by
the JW package designation in the part number.

The 16C74 is a rather old chip.  The 16F74 is the newer flash chip with
the same features.  For development, I would use the 16F877, then go to
the minimum production part later once I know exactly how much code space
and RAM are required.


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