I think that this was a time when lots of stuff was being invented, (and implemented for the first time) often by different people in different places at the same time.
Certainly Burroughs' implementation of VM is VERY different from what we normally think of as VM - but then their architecture (a stack machine with tagged memory) is also very different
Certainly Burroughs' implementation of VM is VERY different from what we normally think of as VM - but then their architecture (a stack machine with tagged memory) is also very different