Comment on [deleted]

• PancakesCantKillMe@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

  Yes. Same as Windows 3.1 running atop DOS. I would say it doesn’t truly qualify as an operating system because of its dependence on a parent OS. Perhaps it’s more of an operating environment.

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  • AnUnusualRelic@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

    I see. Thanks.

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• SlurpingPus@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

  Iirc some mainframe OSes, like z/OS or whatever, support running different OSes atop them.

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  • AnUnusualRelic@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

    Isn’t that in some kind of virtual machines?

    I’m not familiar with those, the only “big” machines I worked with were Tandem.

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    • SlurpingPus@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

      Idk for sure, haven’t properly looked into it. Just read in passing that mainframes were doing this kind of thing for ages.

      Wikipedia says regarding z/OS:

      z/OS has a Workload Manager (WLM) and dispatcher which automatically manages numerous concurrently hosted units of work running in separate key-protected address spaces according to dynamically adjustable goals. This capability inherently supports multi-tenancy within a single operating system image. However, modern IBM mainframes also offer two additional levels of virtualization: LPARs and (optionally) z/VM.

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