Is it possible, and how is it possible. I have a PIC12C671, The part will be programmed, I would like to run a calibration sequence on a function, then store the calibrated value in the rom of the part. If it had EEprom, then no problem. Can I write over a protected rom space that I know is not used with a new value? Or, do I have to do the new ORG procedure and reprogram the part. Gordon Varney www.iamnee.com -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu