At 12:10 AM 14/8/97 -0800, you wrote:
>David BALDWIN <David BALDWIN <PICLIST@MITVMA.MIT.EDU>> wrote:
>
>> I am going to try if OTP parts can be erased with radiations or X
>> rays. Does someone already tried this?
>
>David:
>
>Yes, someone has.  Contrary to popular opinion, it doesn't work.

maybe not for PIC's but for most OTP memory it *does* work.

It takes a lotsa X-ray: a machine used for that purposes is left
working for 30..90 minutes at maximum power with the emitter head
few millimeters from the chip bodies.

The guy who has this machinery in his cellar said that all OTP
EPROM's have been erased. time*energy depends on manufacturer.
Also some Intel micros have been erased. He has not tried PIC's.

I would *not* advise to do such experiments in rural areas.

antti






No Limits                                 Go To
 Basics of AVR                              AVR
 AVRBASIC         www.avrbasic.com          Born for Basic

Grand opening in August.
Watch out for first week offers.