> Would RETFIE be replacable (functionnally) by a manual set of > GIE bit and ordinary RETURN? No, the order is wrong: RETURN first and then set GIE. Otherwise you could get interrupted within the interrupt (which could cause stack overflow). So you kind-of could replace it, but where would you put the set-GIE? Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu