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 | This article needs additional citations for verification. (November 2011) |
 Apple computer running a Hello World program | |
| Developer | Apple Computer |
|---|---|
| Written in | Assembly[1] |
| OS family | Apple DOS |
| Working state | Discontinued |
| Source model | Closed source |
| Initial release | 1978 |
| Latest release | 3.3 / 1980 |
| Kernel type | Monolithic kernel |
| License | Apple Software License Agreement |
Apple DOS is the disk operating system for the Apple II computers from late 1978 through early 1983. It was superseded by ProDOS in 1983. Apple DOS has three major releases: DOS 3.1, DOS 3.2, and DOS 3.3;[2] 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 audio cassette tapes for data storage and retrieval.
- ^ Apple II DOS - Source Code
- ^ Worth & Lechner (1981), pp. 2–1, 2–2, 2–3.