Re: Privilege Levels Below User

On Mon, 10 Jun 2024 15:28:55 GMT, Scott Lurndal wrote:

Lawrence D'Oliveiro <ldo@nz.invalid> writes:
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On Sun, 09 Jun 2024 14:13:25 GMT, Scott Lurndal wrote:
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Lawrence D'Oliveiro <ldo@nz.invalid> writes:

On Sat, 8 Jun 2024 17:37:46 +0000, MitchAlsup1 wrote:
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VAX was before common era Hypervisors, do you think VAX could have
supported secure mode and hypervisor with their 4 levels ??

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“Virtualization” was bandied about in the 1980s more as an idle,
theoretical concept rather than a practical one.

 
I'm quite sure that IBM would disagree with this statement.

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I’m sure they would.

 
[Your] attempt to scramble to avoid being wrong was unsucessful.

Conway’s Law applies: any piece of software reflects the organizational
structure that produced it. IBM had all these different, incompatible and
operating systems that didn’t communicate with each other because they
were produced by different divisions of the company that didn’t
communicate with each other. So how to tie them together? Create yet
another system to act as the glue; not to provide any actual inter-
communication capability, but just so users could at least run more than
one of them at a time, without needing a lot of extra hardware.