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Re:CP/NC – a CP/M-compatible operating system by that_jojo on Tuesday December 17, 2019 @06:29PM (#21820172)
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.

Re:CP/NC – a CP/M-compatible operating system by icedchai on Tuesday December 17, 2019 @09:19PM (#21821171)
VMS feels like DOS if that DOS was from another dimension. About the only thing they have in common is "DIR" and ".EXE" extensions.
Re:CP/NC – a CP/M-compatible operating system by WorldMaker on Wednesday December 18, 2019 @04:07PM (#21829459)
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.