OS-9
Operating system
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OS-9 is a family of real-time, process-based, multitasking, multi-user operating systems, developed in the 1980s, originally by Microware Systems Corporation for the Motorola 6809 microprocessor. It was purchased by Radisys Corp in 2001, and was... Wikipedia
Initial release date: 1979
Programming languages: C and Assembly language
Default user interface: CLI in all versions, some platforms support a GUI
Latest release: 6.1 / November 14, 2017; 6 years ago
License: Proprietary
Source model: Closed source