M-4 multitronic unit
See M-4 for the robot designed by Flint.
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". 

It 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. ()

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Computer technology