What was it, _South Park_ that did the "Simpsons did it" episode? Thinking about some of the things that came along 20 or 30 years later remind of that. Virtual machines? OS/360 did it. Virtual memory? OS/360 did it. Non-executable data? OS/360 did it. I was a security lead for a product while at Microsoft when the NX was being implemented, and wondered at the time why it took 35 years to get around to that. (I've never worked on a 360, but did some work its successor the 370 and OS/370 some many years ago.)

Even the Burroughs had multitasking before then, in the early 60s. And how can you not like a system with a "HEYU" instruction to interrupt other processors?