Some of that did not really materialize during the System/360 era. A custom version of the model 65 was the only one with virtual memory, for example. And wh

Some of that did not really materialize during the System/360 era. A custom version of the model 65 was the only one with virtual memory, for example. And while OS/360 was an architectural marvel on paper see the comments elsewhere in this thread about "The Mythical Man-Month" and how implementing it actually went. The most common System/360 machine as you would see in the 1960s, was the model 30 with 16 to 64 KB of RAM, a couple disks, and a card reader and printer. It would have been mostly programmed in assembly under DOS (the full OS didn't fit), and mostly batch processing. The virtual machine behemoths came with System/370 a bit later, the compatible successor series. With that said, System/360 did innovate quite a lot. Right down to setting the 8/16/32/64 bit pattern for byte and word size, or just the idea of a compatible series of machines running the same software, over the range of 10,000 to 1,000,000+ instructions per second, and from like 8 KB to 8 MB of RAM.