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Operating systems
The operating systems and environments of every era, pick one to see its versions, latest first.
By system
Digital Research CP/M
DOS (MS-DOS / DR-DOS)
Microsoft Windows
Apple Classic Mac OS
Apple macOS
Commodore AmigaOS
Acorn RISC OS
Atari TOS / GEM
Commodore GEOS
Psion EPOC / Symbian
Microsoft Windows 3.x
Microsoft Windows 9x
Microsoft Windows 1.x
ReactOS
Linux
Palm OS
Other notable systems