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The [[eZ80]] is a microprocessor and microcontroller family, with 24-bit registers and therefore 24-bit linear addressing, that is [[binary compatible]] with the [[8-bit|8]]/16-bit [[Z80]]. {{cn|date=September 2015}}
The [[65816]] is a microprocessor and microcontroller family with 16-bit registers and 24-bit [[bank switching|bank switched]] addressing. It is binary compatible with the [[8-bit]] [[6502]].<ref>{{cite magazine |author=Brett Tabke
The range of unsigned integers that can be represented in 24 bits is 0 to 16,777,215 ({{n-ary|FFFFFF|16}} in [[hexadecimal]]). The range of signed integers that can be represented in 24 bits is −8,388,608 to 8,388,607.
Several fixed-point [[digital signal processor]]s have a 24-bit data bus, selected as the basic word length because it gave the system a reasonable precision for the processing audio (sound). In particular, the [[Motorola 56000]] series has three parallel 24-bit data [[computer bus|buses]], one connected to each [[Memory space (computational resource)|memory space]]: program memory, data memory X, and data memory Y.<ref>
[[Engineering Research Associates]] (later merged into [[UNIVAC]]) designed a series of 24-bit [[drum memory]] machines including the Atlas, its commercial version the [[UNIVAC 1101]], the [[ATHENA computer]], the [[UNIVAC 1824]] guidance computer, etc. Those designers selected a 24-bit word length because the Earth is roughly 40 million feet in diameter, and an [[intercontinental ballistic missile]] guidance computer needs to do the [[Earth-centered inertial]] navigation calculations to an accuracy of a few feet.<ref>
== See also ==
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