Thanks for the idea. I thought for sure this would
solve the problem, but no difference even when the window
is covered during and after programming.

Roger


>
> I had the same problem, but I wasn't covering the eprom
> window and stray
> light was affecting the electron flow or something that sounds just as
> unlikely was happening.  When I covered the window, the
> problems went away.
>
> >>I'm having a very strange problem when programming a
> >>PIC14000. I have MPlab Ver 4.12.12 and a PICSTART Plus
> >>version 2.01.00 running on NT4.0 SP3.  I'm using an eprom
> >>version of the 14000 and when I program the chip even though
> >>it verifies correctly, the chip will operate correctly about
> >>every other time it is programmed.  I've tried another 14000
> >>and the same thing happens.  When  the chip doesn't work it
> >>sometimes is dead in the water when it powers up, but sometimes
> >>the program will partially run.  Then when I erase and reprogram
> >>with no changes to the code it will run perfectly.  Has anyone
> >>experienced this type of problem or have any ideas on what
> is happening?
> >>
> >>I'm about to start using some OTP chips but am leery of the
> same thing
> >>happening and I can't afford to lose half of my chips to
> this problem
> >>
> >>Any help is appreciated
> >>
> >>Roger
> >
> >
>