Hi to you all,

about a month ago I had the question of the erasability of OTP EPROM
devices using X-Rays (Roentgen...) as a means of transporting the necessary
energy into the crystal structure in order to reset the memory cells. I
gave two prepared cards with several EPROMs and PALs on it to a friend, who
works at a veterinary clinic, and she put the 2 sheets under X-Rays for two
different periods of time.
Her parameters were: 40 KV (lowest possible voltage) and 100 resp. 400 nAs.
So there were three different scenarios possible:
- Nothing happens to the ICs
- The information is erased...
- The whole IC is destroyed

So yesterday evening I had the opportunity to test the ICs, and to my
chagrin I could only detect that nothing had happened to both charges of
ICs. So now I am looking for a different radiation source, e. g. a
materials lab or so having a Roentgen source that can operate for a longer
time to increase the dose of radiation to the ICs

Does anybody have access to such an apparatus??

Greetings

Jochen DH6FAZ
jf @ detektor.de