Here in Toronto Canada none of the local stores seem to stock the windowed version of the 12C508, but they do have the 12C509. Since the only difference is the memory space, I used one of these to develop a 12C508 circuit. It worked fine. CIAO - Martin. ______________________________ Reply Separator _________________________________ Subject: PIC12C508 Author: pic microcontroller discussion list at Internet Date: 5/19/98 9:26 AM I 've seen in Microchip's Datasheet that the PIC12C508 should be available in UVPROM version. Is it easy to find this part in the US as It's almost impossible to get it in France. Thanks, Richard.