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System 6
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System 6 is the sixth major release of the classic Mac OS operating system for Macintosh computers, made by Apple Computer. It was released in 1988. It is a monolithic operating system, with cooperative multitasking based on an improved MultiFinder. The boxed version cost US$49, and it was included with all new Macintosh computers until 1991, when it was succeeded by System 7.