> I always thought that one could interchange between OTP and flash > b'cos it was the same thing but the erasing was different. Am I wrong? You can mix OTP and JW (windowed) because they are the same chips (just different packaging). To my knowledge (TMK?) there are no PIC types that are available both as OTP and as flash, so interchange would be limited to the compatibility of the two different chips. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics