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CP/M is an operating system developed by Digital Research, Inc., originally released in 1974.
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 Amstrad CPC.
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.