Are 16f628 and 16f628A difference each other?

[paul borgmeier]

And to be honnest, using the internal OSC and try to make it run @9600 baud... may work or not.

I agree with Steve (and Ron), the internal Osc is a probable cause until proven innocent. Things to try:

Try using a XTAL like you did on 16F628 (if problem stays, then not internal osc problem)

Try a slower baud rate (more forgiving with Internal Osc)

Paul Borgmeier
Salt Lake City, Utah
USA