At 15:13 17/09/99 -0230, you wrote: Only the 16F87x and 17cxxx parts can read there own program memory. You cannot read the ID locations from within program memory on any PIC. Jim >Hi all, > >I've got to do a checksum on program memory and compare it to a known >checksum. I want to store the known checksum on the PIC. Is there >anywhere I can store it besides in the program memory or those ID >locations? > >And if i did store it in those ID locations, how do I read it? >Thanks > >DAve > Regards, Jim Robertson NEWFOUND ELECTRONICS ________________________________________ Email: newfound@pipeline.com.au http://www.new-elect.com MPLAB compatible PIC programmers. ________________________________________