Hello: I have a program that sort of works with the 16F870 and I would like to use ICD2 & 16F873A to debug it. When I load my program into the 16F873A and change the configuration bit to _WRT_OFF (was _WRT_ENABLE_ON) the program assembles in 5.70.40 but does not run. Any porting ideas? thanks, Brooke -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.