1. A digital computer for performing a set of instructions, said digital computer being comprised of: an array of microprocessors; each of said microprocessors being characterized as including respective control memory means for storing commands, means for sequentially fetching selectable sequences of said commands, and circuits that perform functions on digital data in response to said fetched commands; said circuits being characterized as including a plurality of electrical contacts which define said functions that said circuits perform; said commands and said contacts being chosen differently within the microprocessors such that the microprocessors are adapted to efficiently perform respective parts of the instructions in said set; and one of said microprocessors having its circuits and command sequences adapted to perform conditional operations without first determining if those conditions exist; and another of said microprocessors having its circuits and command sequences adapted to determine whether said conditions exist and alert said one microprocessor if they do not exist.