DOS
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DOS is a family of disk-based operating systems for IBM PC compatible computers. It primarily consists of IBM PC DOS and a rebranded version, Microsoft's MS-DOS, both of which were introduced in 1981.
The IBM Personal Computer (IBM 5150 PC)
CP/M
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CP/M, originally standing for Control Program/Monitor and later Control Program for Microcomputers, is a mass-market operating system created in 1974 for Intel 8080-based microcomputers by Gary Kildal
DOS
…and the separately sold MS-DOS) and its predecessor, 86-DOS, ran on Intel 8086 16-bit processors. It was developed to be similar to Digital Research's CP/M—the dominant disk operating system for 8-bit Intel 8080 and Zilog Z80 microcomputers—in order to simplify porting CP/M applications to MS-DOS. When IBM…
CP/M advertisement in the 29 November 1982 issue of InfoWorld magazine
CP/M Plus (CP/M 3) System Guide
DEC PRO-CP/M-80 floppy disk distribution for the Z80-A coprocessor in a DEC Professional 3xx series
Sanco 8001 computer, running under CP/M 2.2 (1982)