> I mean, there's no "GOTCHA" with
> the windowed "JW" type and
> plastic-DIP versions is there?

Those are
EPROM based!
Like with
normal EPROMs
you need
UV-light to
erase the
chip.

The JW
variant has
a window,
that allows
you to shine
UV onto the
cells. You
can erase
such a chip
in 10-20
minutes.

The P-DIP
does not
have a
window,
making it
_one_time_
programmable
(OTP). Once
you have
programmed
it, it's
over. You
can't erase
it anymore.
If your
software is
working,
fine. If
you suddenly
realize you
still have
a bug in it,
throw it
away and buy
a new one.