Alan wrote:
> >Is there a difference ( or several differences)
> >between a 509 OTP and a 509 Eprom?
>
> People have reported problems like this in the past, but typically in the
> reverse direction, I.E. JW->OTP.
>
> What is known to happen is that the light coming in the window of
> a JW part
> will initialise RAM registers to different states to the OTP
> parts.

I always cover the window so that light never gets in.  I learned this may
years ago when I was trying to connect to the RS232 port on a PC.  Every
time I put my hand near it (or over the top of), it would work.
Apart from that, you must always pre register the ram variables so that you
know what they start up with.

In what way is the PIC "not working at all"?  Does the oscillator run?

Brian.

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