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Apple DOS

Operating System

Apple DOS is the disk operating system used on Apple II computers from late 1978 through early 1983, when it was superseded by ProDOS. It had three major releases, DOS 3.1, DOS 3.2, and DOS 3.3, each followed by a minor bug fix release, though only the DOS 3.2 minor release received its own version number, 3.2.1, and the best known and most used version was DOS 3.3 in its 1980 and 1983 releases. Before DOS 3.1 was released, Apple users had to rely on audio cassette tapes for data storage and retrieval. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/

Facts
Classification
License
Proprietary (Closed Source) 1
Status
Status
Discontinued 1
Year
1978 2
Connections

In Field

Operating Systems, Fields
Source Wikipedia: Apple DOS

Licensed Under

Proprietary Software, Concepts

Entity-backed identity for the license enum value this item already carries, resolved to a software license concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The license fact itself stays on the item unchanged.

Sources
1. Wikipedia: Apple DOS
  • Lead section, opening sentence
    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 It was superseded by ProDOS in 1983.
  • Lead section, cassette tape sentence
    Prior to the release of Apple DOS 3.1, Apple users had to rely on audio cassette tapes for data storage and retrieval.
  • History section, abandonment sentence
    Apple abandoned this iteration of DOS in 1983, when Apple DOS was entirely replaced by ProDOS.
  • Infobox, License field
    Apple Software License Agreement
  • In Field: Operating Systems, Lead sentence
    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 It was superseded by ProDOS in 1983.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; each one of these three releases was followed by a seco
View the Source
2. Wikidata: Apple DOS
  • Wikidata Q621234, class allow-list match (w-wdresolver-0926)
  • Wikidata Q621234 P577 (publication/release date) claim -> 1978; checked 2026-09-28
View the Source
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