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#21
As I've been around computers, in one capacity or another, since "smoke signals" (1962) I've seen a lot of different Operating Systems. In my day job I worked with proprietary OS', IBM mainframes (IBM calls it the "Supervisor") from 360's to 3031's, XENIX, Novell 3.12 (which was basically DOS), and finally Micrososft from the old DOS days to present.
In my personal PC's I started out with a Commodore VIC 20 and then to MS DOS and up to present systems.