SunOS
Operating system
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SunOS is a Unix-branded operating system developed by Sun Microsystems for their workstation and server computer systems. Wikipedia
Developer: Sun Microsystems
Initial release: 1982; 42 years ago
Programming language: C
Default user interface: SunView, OpenWindows
Latest release: 4.1.4 / September 1994; 29 years ago
Source model: Closed source