A functional crab computer would probably have to be built from delay insensitive logic[1]. The outputs of the gates would be of the form X and !X, where the si

A functional crab computer would probably have to be built from delay insensitive logic[1]. The outputs of the gates would be of the form X and !X, where the signal (crab cluster) would appear at the appropriate output. With regards to crab supply, I think the sufficient study of reversible computing, and in particular their charge conservation properties, would address that. You'll still have to have a mechanism to spray bits of dead fish around to feed the thing. -- [1] http://en.wikipedia.org/wiki/Delay_insensitive_circuit http://en.wikipedia.org/wiki/Delay_insensitive_circuit [2] http://en.wikipedia.org/wiki/Reversible_computing http://en.wikipedia.org/wiki/Reversible_computing