> Do you know of overlapping IDs within a family? That would > be really bad. IIRC there is some chip with motor control firmware, which has the same ID as the corresponding chip without the firmware. You could argue that they are the same chip, but to preserve the firmware the chip has to be erased differently. I have a vaugue recollection of some other chips that had the same documented ID, but this might have been 'just' a documentation error. Did you check the 12rf chips? 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