Apple DOS
Operating system
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Apple DOS is the family of disk operating systems for the Apple II series of microcomputers from late 1978 through early 1983. It was superseded by ProDOS in 1983. Wikipedia
Programming language: Assembly language
Initial release: 1978; 46 years ago
Latest release: 3.3 / 1980; 44 years ago
OS family: Apple DOS
Source model: Closed source