[vcf-midatlantic] X-ray erasure of EPROMs, was Re: Getting Data off old Atari Floppies

Dave McGuire mcguire at neurotica.com
Mon Dec 14 19:47:43 EST 2015

On 12/14/2015 07:46 PM, Jonathan Gevaryahu via vcf-midatlantic wrote:
>>>>> Yeah 300F was completely wrong, I was mixing baking floppies up with
>>>>> baking EPROMS after x-ray (not UV!) based erasure (which really does
>>>>> need 300F).
>>>>   Can you tell me more about this?  Does baking somehow address the
>>>> problem of surface state creation during X-ray erasure?
>>>>   (I type this with a glance at a stack of trays containing several
>>>> thousand non-windowed EPROM-based microcontrollers, and another glance
>>>> over at my X-ray machine..)
>>>     You forgot to mention your electron microscope.
>>    Can an electron beam erase EPROMs nondestructively??
> I know a UV laser can, but you need to live-decap (i.e. decap without
> damaging the die or bond wires) the chip first. This is used by security
> researchers to unset security bits etc on microcontrollers.

  Well we know UV can.  That's just targeted UV.


Dave McGuire, AK4HZ
New Kensington, PA

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