That's OS-9, with a hyphen: https://en.wikipedia.org/wiki/OS-9 *Not* to be confu... | Hacker News

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lproven on Nov 6, 2020 | parent | context | favorite | on: In the Beginning was the Command Line (1999)

That's OS-9, with a hyphen: https://en.wikipedia.org/wiki/OS-9

Not to be confused with the IBM family of OSes with a slash, notably OS/2 but also including OS/390 and OS/400.

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