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When I was a kid I had access to all sorts of exotic operating systems. SunOS, VMS, all sorts of Unixes. I was a very naughty boy.

[eesmith]

SunOS and VMS were two of the most common workstation/minicomputer-class OSes out there, and rather less exotic than IRIX.

I'm old enough that my college-freshman "intro to computers" and Fortran classes were taught on a CDC Cyber running NOS.