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Mac operating systems - Wikipedia
Classic Mac OS - Wikipedia
OS/2 - Wikipedia
How to download and install macOS - Apple Support
macOS versions: Every update including the latest | Macworld
Apple Macintosh II (Original) Specs - EveryMac.com
macOS compatibility: What macOS versions can my Mac run ... - Macworld
How to Download and Install Older Versions of macOS - How-To Geek
Find out which macOS your Mac is using - Apple Support