In computer architecture, 24-bit integers, memory addresses, or other data units are those that are at most 24 bits (3 octets) wide. Also, 24-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size.
The IBM System/360, announced in 1964, was a popular computer system with 24-bit addressing and 32-bit general registers and arithmetic. The early 1980s saw the first popular personal computers, including the IBM PC/AT with an Intel 80286 processor using 24-bit addressing and 16-bit general registers and arithmetic, and the Apple Macintosh 128k with a Motorola 68000 processor featuring 24-bit addressing and 32-bit registers. The eZ80 is a microprocessor and microcontroller with 24-bit registers and addressing that is binary compatible with the 8/16-bit Z80.
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