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Some kind of wonderful reverse8/23/2023 A few silicon prototypes have been built and shown to work. The theoretical possibility of a digital computer that can run forward and backward with equal ease has been recognized for more than 30 years. In the case of toasters and gasoline engines, full reversibility is too much to ask, but no fundamental law forbids reversible computing. For computers of the current generation, such reversals of logic and arithmetic are simply not possible. Some of the individual instructions would also have to be reversed, or inverted for example, undoing addition requires subtraction. Even if that were feasible, the backward-running program would not uncompute an answer. When a program is running, there's no way to turn it around and have it step through the same instructions in the opposite order. Computers, too, are mostly irreversible machines.
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