Besides the Test PLA, the 386 has another PLA called the Entry PLA that maps opcodes to microcode entry points. One of its input bits is a "protected mode" flag. Many instructions have both a real-mode and a protected-mode entry point -- for instance, MOV ES, reg maps to address 009 (a single microcode line) in real mode, but to 580 (which initiates a full descriptor load with protection tests) in protected mode. The trick that makes V86 work is to define this flag as:
但这些顾虑最终没有改变任何事情。
。关于这个话题，Line官方版本下载提供了深入分析
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1. 根据数据范围创建若干个桶
Test constant: A 6-bit identifier from the microcode that tells the PLA what kind of check to perform.