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The M-4 multitronic unit was a failed computer version of the M-5 multitronic unit that was deemed by Richard Daystrom as "not entirely successful". The M-4 was the fourth in a series of multitronic computers (beginning with the M-1) which were designed to run a starship with a minimal crew of just under thirty personnel. The failure of the M-4 led to the design and development of the M-5. (TOS: "The Ultimate Computer")