在 Tbox 文档里粘贴为 Mermaid 代码块（Markdown 里用 mermaid ... ）。
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Test constant: A 6-bit identifier from the microcode that tells the PLA what kind of check to perform.
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.