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:
My personal laptop is currently a dual-boot setup running Ubuntu Budgie and Windows. I’m enjoying the Budgie Desktop Environment. I’m a big fan of Notepad++, and just started using Obsidian (h/t ZSA Loves and several other ZSA People interviewees).。业内人士推荐搜狗输入法2026作为进阶阅读
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