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Comment: TI calculators (Score 2) 88

People have done this on TI calculators (& likely other systems with similarly little shielding & sufficient clock rates). No hardware support needed—just cause some long enough trace (e.g. on the data bus) to oscillate at the correct frequency. Granted, a 6 MHz Z80 can pretty much only only do AM radio (& can only be picked up right next to the radio), but the principle is not new.

Comment: Re:only ancient encryption not breakable by fast c (Score 1) 166

by Mr.Z of the LotFC (#49068479) Attached to: Vint Cerf Warns Against 'Digital Dark Age'
You could use reversible computing to crack (classical computing-based) encryption, so it would only take however much energy you need to keep the system shielded from the environment. The only potentially-unknown bits that need to be erased are those used for error correction.

Comment: Re:Bullshit (Score 1) 211

by Mr.Z of the LotFC (#48911237) Attached to: At Oxford, a Battery That's Lasted 175 Years -- So Far
I once got a rather disconcerting shock (painful tingling) from a single 9V battery while attempting to disconnect it from a circuit. I must have had something conductive on my hands. It was similar to the feeling of accidentally touching both prongs of a partially-inserted 120V plug. On the other hand, I got a much worse shock from a plastic slide...it was so bad that I fell down the slide & could not move for a bit afterward. (I did go out of my way to poke a wet stick into a crack & reach the metal pipe holding it up, though.)

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