JIO_OK ("jump if I/O OK") tests whether CPL ≤ IOPL. The same check gates PUSHF, POPF, INT n, and IRET. The monitor then emulates each instruction as appropriate: maintaining a virtual interrupt flag per V86 task, reflecting software interrupts through the real-mode interrupt vector table, virtualizing I/O accesses, and so on.
Less Than (2): Everything in this space must be less than 2. The answer is 6-0, placed horizontally.
，这一点在91视频中也有详细论述
Фото: Fabrizio Bensch / Reuters。关于这个话题，safew官方版本下载提供了深入分析
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