CP/M
Operating system
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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 8080/85-based microcomputers by Gary Kildall of Digital Research, Inc. Wikipedia
Programming languages: Assembly language and PL/M
Initial release date: 1974
Developer: Digital Research and Gary Kildall
Available in: English Language
License: Proprietary software and BSD licenses
Default user interface: Command-line interface (CCP.COM)
Latest release: 3.1 / 1983; 41 years ago