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24-bit




The IBM System/360 , announced in 1964 , was an extremely popular computer system with 24-bit addressing and 32-bit general registers and arithmetic. The early 1980's 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.