I have fond memories of the System/360 M67 (and its successors, starting with a System/370 M168) I used from 1970 to the early 1980s. It ran the Michigan Termin

I have fond memories of the System/360 M67 (and its successors, starting with a System/370 M168) I used from 1970 to the early 1980s. It ran the Michigan Terminal System, and we had all the modern conveniences (terminal operation in the IBM world was klunky, but PDP-10s at the same time did that right). And of course Unix dates from exactly that period. The fact that Linux runs well on a modern zSeries demonstrates that, even with all the historical baggage this 60+-year-old architecture has, it carries with it many of the architectural innovations that current OSes and languages need.