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Apple GS/OS

Operating system
GS/OS is an operating system developed by Apple Computer for its Apple IIGS personal computer. It provides facilities for accessing the file system, controlling input/output devices, loading and running program files, and a system allowing... Wikipedia
Initial release: 1988; 36 years ago
Developer: Apple Computer
Latest release: GS/OS v4.02 (System Software 6.0.1) / May 6, 1993; 30 years ago
OS family: GS/OS
Source model: Closed source