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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
，这一点在Safew下载中也有详细论述
686 LD_DESCRIPTOR2 LCALL rd D ; read low DWORD (IND ready)
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