DR-DOS
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DR-DOS is a disk operating system for IBM PC compatibles, originally developed by Gary A. Kildall's Digital Research and derived from Concurrent PC DOS 6.0, which was an advanced successor of CP/M-86.
Front and rear views of the Carry-I book-sized diskless workstation, bundled with DR DOS 5.0, based on an Intel 80286 processor and produced by Taiwan's Flytech Technology c. 1991
Digital Research DR DOS 6.0 startup disk
Novell DR DOS 6.0 manual
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
DR-DOS
…beta versions of DR DOS 9.0, an operating system written from scratch and not based on the code of previous versions. Digital Research's original CP/M for the 8-bit Intel 8080- and Z80-based systems spawned numerous spin-off versions, most notably CP/M-86 for the Intel 8086/8088 family of processors…
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)