Peter Onion wrote : > I have a 16F877 development system I built a few years ago, an now I'm > considering moving to newer 18FXXX devices. > > My development system has a 16F627 with a RS-232 i/f to the > PC and uses ICSP to program the 16F877. > > 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) ? Modify ? Why not simple *use* a programmer that supports whatever chip you'd like to use ? Anyway, you should expect the programming protocol to be different and non-compatible... Jan-Erik. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.