> B.t.w, can you see this on the outside of the chip ? > I'v got a 18F452 marked "0240H1C". According to the > data sheet, the "0240" ithe year and week and the > "H1C" is called "Alphanumeric traceability code". > Does this relates in some way to the "C0" revision ? I don't know, but I do know that the C0 chips have version number 7 in the processor ID word. The previous chips I had were B5 silicon (I think), and they had version 5 in the processor ID word. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.