Hi Another question :) The config bytes are stored at address outside the flash address range, are these stored in the hex file and if so does MPLAB do this for you or do you have to add the config bytes to your assembler code and then it gets added to the hex that way. BryanW -- Software Engineer - Embedded Results Ltd, http://www.kanda.com https://www.kanda.com/stk200.html -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist