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645 SIGMA 0x8200 OR DLY IN+D ; SIGMA = 0xE200 (V86 access rights)。业内人士推荐同城约会作为进阶阅读
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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.
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Tony Jolliffe BBC