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Wait wait wait...so it effectively memory maps all the things? Mainframe environments are weird.

• pjmlp 13y ago
  And OS/400 files are libraries that you need to open, as another example of strangeness. Or the OS/360 which uses virtualization for all OSs, like Hyper V does on Windows. The first OS to boot from the hypervisor has master rights, but all OSs are virtualized.
  • fulafel 13y ago
    > Or the OS/360 which uses virtualization for all OSs, like Hyper V does on Windows No, the hypervisor was called VM. According to WP it most frequently ran CMS guests, which was a light weight single-app OS. But could also run OS/360 guests (which predated VM).
• derleth 13y ago
  AS/400 isn't mainframe. It's midrange; smaller than a mainframe, and not as flexible.