In message  <97Mar17.165816gmt+0200.41224-1@city.durban.gov.za>
 PICLIST@MITVMA.MIT.EDU writes:
> Sorry if this is a tired, hackneyed question....
>
> I've two windowed 12C508's with the code protection bit set. Are they
> destined for the scrap heap or not? I erased them overnight, and was
> able to program them, but when I placed them in a circuit in which
> the OTP version works fine, I have no joy.
>
Rob,

The 12C508JWs can be code protected and un-code protected at will,
so the problems must lie somewhere else. Have you covered the window?

Regards,


Mike Watson