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timtyler comments on What I've learned from Less Wrong - Less Wrong
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Reversible computer designs people actually consider building do a small bit of irreversible computation copying end results of the reversible computations into irreversible memory before rolling back the reversible computation. Perfectly reversible computations are a bit useless since they erase their results when they start rolling backwards.
Nobody says you have to run a reversible computer backwards.
A big part of the point is to digitise heat sinks and power management. For details about that, see here.