[Poser]

Unknown are CP/M, TRSDOS, Altos, PC DOS, DR-DOS, UNIX, XENIX, Amiga OS, QDOS and a few others I used in the 780s and 80s.

[Openurmind]

“Unknown are CP/M, TRSDOS, Altos, PC DOS, DR-DOS, UNIX, XENIX, Amiga OS, QDOS and a few others I used in the 780s and 80s.”

Except for UNIX I’m trying to figure out who would still be using these obsolete 32 bit systems or know how? Or even why? Let alone to the tune of five times more than Linux? lol

I’m real sure the “unknown” numbers are not at all accurate... :)

[Getready]

Amiga OS up to Amiga OS 4.1. Has lively, albeit,very small ,following and developers.
Security through obscurity.