CP/M is an operating system developed by Digital Research, Inc., originally released in 1974.
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The [[ZX Spectrum +3]] included CP/M support in ROM. The version included is CP/M Plus, which provides compatibility for programs written for the older CP/M 2.2, matching that provided by the [[:wikipedia:Amstrad CPC|Amstrad CPC]].
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CP/M 2.2 compatibility was available for the [[SAM Coupé]] using [[Pro-Dos]]. This did not license the original CP/M code, but was a reimplementation of the interfaces provided by CP/M.