Peter Onion wrote: > Q: Is the ICSP spec for 18FXXX devices the same as it was for 16F877, > or will I need to modify the programmer to use it with 18FXXX devices > (IE is the ICSP spec the same) ? The electrical details like 13V on MCLR, clock on PGC, serial data on PGD are the same. The low level protocol is very different. Of course this is all spelled out in the programming specs. ***************************************************************** 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.