Hi Group,

I been using some EPROM "windowed" 16C73 chips.  I am finding that over
several cycles of erasing/programming (about 20) that the time to UV erase is
becoming longer and longer.  I have a few that will not erase at all.  I have
not been setting the code protect bit during programming.

I have not ruled out the UV eraser but would think that it would impact all
devices and not just a few.  I also have not ruled out the PIC programmer
either, the PICMATE, is the one I am using.

Any suggestion?

Paul