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Reminds me of techniques used to detect CRT radiation to rebuild what is being displayed. https://en.wikipedia.org/wiki/Van_Eck_phreaking

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Anyone remember the program that would let you input an mp3 and it would flash your CRT a certain way that you could pick up the song on an AM radio close by? I believe it was called tempest like the codename.

Found it: http://www.erikyyy.de/tempest/

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