Hi all, I've recently gotten back into pics after a long hiatus. I have a Picstart Plus. I can program a 16F84 with no problems (using the infamous "First.asm"). However, I can't seem to program a 16C54 OTP that I have quite a few of (a company I once had long ago...). I get a couple of "memory errors" after the program (if I verify), and the LED doesn't blink. The code: LIST P=16C54 MOVLW 0 TRIS 6 OPTION LOOP SLEEP INCF 6,F GOTO LOOP END Any ideas? Thanks! Mark -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:","[SX]:","[AVR]:" =uP ONLY! "[EE]:","[OT]:" =Other "[BUY]:","[AD]:" =Ads