CP/M-86
Operating system
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CP/M-86 is a discontinued version of the CP/M operating system that Digital Research made for the Intel 8086 and Intel 8088. The system commands are the same as in CP/M-80. Executable files used the relocatable .CMD file format. Wikipedia
Initial release: November 1981; 42 years ago
Default user interface: Command-line interface
License: Originally proprietary, now BSD-like
OS family: CP/M
Source model: Originally closed source, now open source