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
PPT 的好坏见仁见智，我仅从能否在工作场景下使用来主观评判；，更多细节参见heLLoword翻译官方下载
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