My favorite formatter was my S100 crate with CP/M,
[it's] impossible
to give a single user OS without background processing a virus.
I disagree. I see nothing about "a single-user OS without background
processing" that would prevent a virus from infecting other programs,
even including the OS, when it's run, and potentially doing something
else as well.
Perhaps you are using some meaning of "virus" other than "piece of
software that infects other software to propagate itself"? That's the
only meaning that makes any sense to me.
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