I have been experimenting with a 16C73B for a couple of weeks with no
problems and in the last few days I have ruined 2 of them by accidental=
ly
code protecting them. The first time I thought it had been my mistake, =
but
then I has more carefull and the second one only lasted a couple of hou=
rs,
and I am completely sure about checking the code protection bits before=

eache individual programming.
So I think this might have something to do with teh programmer (Ider HW=
 or
SW) or somehing about my PC.
I am using Bojan=B4s Picall programmer with home made HW on a generic p=
entium
233 PC.

Any ideas on what can be hapening? or what condition should I avoid to
reduce teh risk of this happening again?
This is not funy sience this chips cost $40 each here.
Regards,

Esteban.
=