> I just checked I have 2 open inputs. How can open input > change program memory? Dunno, but open inputs can be bad: just a little charge can create an out-of-spec volatage on the pins. And the trouble with out-of-spec is that it is out-of-spec, that is: behaviour is not guaranteed. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist