This is a reasonable optimization to do. It is never incorrect; your
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"We would basically take a screenshot of that house or residence and shoot it over to John and say 'would this house have these bricks inside?'" says Squire.
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The solution is trap-and-emulate, the same principle later generalized in hardware virtualization extensions. V86 mode adds a special rule: since V86 tasks always run at CPL=3, if the OS sets IOPL