Re:23+, believe it or not (Score 1)

My list is similar. It comes from having been doing this too long.

What was the name of the OS on the XDS Sigma 7?
Scope, Kronos, Nos on cdc 6600, etc.
Exec 8 on univac 1108
rt-11, rsx-11m, unix on pdp-11s
DOS on IBM 360 mod 40? (no not MS-DOS)
Sun-OS, Solaris on Sun
HP-UX on HP 9000
VMS (lots of versions) on Dec Vax
Old MAC finder
MS-DOS of various versions
MVS on IBM 3083
VM/CMS on IBM 4381
Windows: 3.1, 95, 98, NT 3, NT 4, 2K, XP
MOS
various other OSs on other small personal computers including ZDOS and stuff like that.
HP 64000 emulator system had its own OS
HP 1000 OS
IRIX on SGI