CP/M (Control Program for Microcomputers) is an operating system from which MS-DOS was cloned. It was created by Digital Research, Inc. for Intel 8080 computers. The original proprietary version of CP/M from 1978 used up to 64K of RAM on an 8-bit processor. By version 3 (1983), it could work on a 16-bit processor with multi-user mode.

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