Sam Spade writes:

In those $10 million simulators it sure as Hell ain't windows.

I don't know, as I don't have any specs in front of me, but Windows
might well be used for certain functions, as it would lower
implementation costs if the OS is suitable for the purpose (writing a
custom operating system is very expensive). If the actual simulation
software is custom-written, I'd expect something a bit more efficient,
like a bare-bones UNIX system, or a dedicated real-time OS. But one
cannot use just anything, because the more exotic the OS, the more
expensive the development carried out for it.

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