I dunno.<p>For a long time the dominant programming environment for IBM mainframes has been VM&#x2F;CMS,  where VM is something like VirtualBox and CMS is something a lot like the old MS-DOS,  i.e. a single process operating system.  Say what you like but it was a better environment than anything based on micros until you started seeing the more advanced IDEs on DOS circa 1987 or so.<p>Now the 360 was a machine designed to do everything,  but it&#x27;s clear the virtual memory in most machines is an issue in terms of die size,  cost,  power consumption and performance and I wonder if some different configuration in that department together with a new approach to the OS could make a difference.