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Not only that, but CP/M itself has a rather DEC-ish flavor to it. PIP was found on RT-11 and RSTS/E (maybe RSX-11 as well?), and the drive identifier with a colon is also a nod to DEC.

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It's not a secret that CP/M was influenced by RT-11. Lots of clear similarities. Kildall and his team used DEC machines as cross development machines.

VMS feels like DOS if DOS were actually secretly UNIX

Also, don't forget about OS/8 for the PDP-8 series. Very DOS-y, and released by DEC all the way back in '71.

VMS feels like DOS if that DOS was from another dimension. About the only thing they have in common is "DIR" and ".EXE" extensions.

Which is also why it's so fascinating Windows NT sort of merged both parallel dimensions with its influences directly from both DOS and VMS.

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