High Quality Content by WIKIPEDIA articles! In computer architecture, 4-bit integers, memory addresses, or other data units are those that are at most 4 bits wide. Also, 4-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. The Intel 4004, the world's first commercially available single-chip microprocessor, was a 4-bit CPU. The F-14 Tomcat's Central Air Data Computer (or F14 CADC) was created a year before the 4004, but its existence was classified by the United States Navy until 1997. Also, the HP48 Saturn processor (a commonly used scientific calculator) is basically a 4-bit machine, though it strings multiple words together, e.g. its 20-bit memory addressing.

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