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Reference.org
Apple DOS
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<p>Apple DOS is the <a href="/facts/Disk_operating_system/Kc28g5MR">disk operating system</a> for the <a href="/facts/Apple_II/se82CNvK">Apple II</a> computers from late 1978 through early 1983. It was superseded by <a href="/facts/Apple_ProDOS/51vuP5te">ProDOS</a> in 1983. Apple DOS has three major releases: DOS 3.1, DOS 3.2, and DOS 3.3; each one of these three releases was followed by a second, minor "bug-fix" release, but only in the case of Apple DOS 3.2 did that minor release receive its own version number, Apple DOS 3.2.1. The best-known and most-used version is Apple DOS 3.3 in the 1980 and 1983 releases. Prior to the release of Apple DOS 3.1, Apple users had to rely on <a href="/facts/Cassette_tape/w8I5uyfs">audio cassette tapes</a> for data storage and retrieval. </p>