>Has anybody tried nuclear sources, though? I mean, this part of the >country is known for uranium and radium deposits, so ... Yes experiments are made. most chips were fried before erase. One 8751 style thing survived the erasure with some minor trouble in logic circuitry. 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.