Thanks BillW. No wonder the MPLAB/ICD2 wasn't working as I expected from the -F675 data sheet. Wonder WHY Microchip didn't mention NO DEBUG available, even though they reference ISSP via two pins. Looks like 'debug' will all have to be via Simulator; a bit more work at times. Which means some of the I/O code will have to be working solid before I can view real time operations with scope or logic analyzer (RockyLogic's Ant8). Fortunately the four I/Os are serial; RS232 and OBDII VPW. Such a JOY, w/o DEBUG!!!!! Tough life. Guess it wasn't the best choice, but will stick with it. This is mainly for learning. Already learned MORE than I wanted! I suppose this thread can be closed, unless anyone else wants to put in their 2 cents. Harley -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist