Nice! Depending how fancy you want to be and from what i understand about your project, F873 should be enough indeed. F876 could be the update one.
Gooooood ol' 16F
You said you had 3 18F2550... Microchip demo or not? If they are Microchip demo... well they COULD be faulty... on the other hand i never had any faulty one from microchip myself... Still possible.
Well, since you have something's working... over 40 post and 10 page later but at least somethings work
Good luck!
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