What Is the Oldest, Still Supported OS?
by abrax3141 on Hacker News.
I recently discovered that TSOS, an old Univac OS that I used (and loved!) in the mid 1970’s and first released in 1968 by RCA, is still supported (although the name has changed) as Fujitsu’s BS2000 OS. Unix was released a year after that (1969). Is there something that beats these?