aaronsw comments on Causal Universes - Less Wrong
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I don't totally understand it, but Zuse 1969 seems to talk about spacetime as a sort of discrete causal graph with c as the generalization of locality ("In any case, a relation between the speed of light and the speed of transmission between the individual cells of the cellular automaton must result from such a model."). Fredkin and Wolfram probably also have similar discussions.