3D Gopher, by McCahill and Erickson

http://www.pliant.org/personal/Tom_Erickson/GopherVR.html

of RISC-based personal computers, the time seems ripe. Finally, we would like to put our beliefs about the advantages of 3-D spatial interfaces to the test. We see two possible ad

History of IRIX

https://ryan.thoryk.com/sgi/irix_versions.html

of RISC/os : "MIPS computers running RISC-OS can support four different personalities: default, BSD 4.3, System V.3, and System V.4 (older versions of RISC-OS don't support V

That's everything I could find.
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