>   Just now something strange happened to me, or rather to both 16C74A Pic's
> I've got here.  Before today they worked fine.  Programmed & erased them
> some
> times (about 2-3 times a day for 3 months, nothing special I think).  But
> suddenly
> my programmer (PicStart+) told me that my Pic's where not empty.  O.k I
> tought,

Wonder if it's the PicStart+.  Mine mostly refuses to work with
16C73s.  Sometimes claims they are programmed when they are blank.
Reads _note this_ all zeros sometimes, all ones other times.

ITU Tech PIC-1+ is perfectly happy with the same PIC and programs
it just fine.

Orin.