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I see most of the comments are immediately cutting over to Unix clones, which is sad. RSX280 is a professional quality take of Dave Cutler's (yes, of NT fame) architectural innovations in RSX-11. The Unix groove is worn deep, deep into the vinyl. Expand your horizons! RSX280 is unlike Unix in any way, and this is a Good Thing.

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RSX-11M was released in November 1974, at the same time as CP/M, itself influenced by DEC's TOPS-10 operating system.

The first version of the RSX-11M file system had a flat hierarchy (as CP/M), meaning it was not possible to have folders inside folders.

RSX-11M 2.0 was introduced in September 1975, it was multi-users. For CP/M it was in 1979.

=> In contrast, Data General RDOS (Real-time Disk Operating System) was a real-time, multi-user, hierarchical file system operating system released in 1970!

Many command names from RSX-11 and CP/M are the same as in RDOS.

I think you may be thinking of RSX-11M. Dan Brevik was the main architect for RSX-11.

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