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:
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There is nothing in the UI that emphasizes that these backups are now tightly coupled to their passkey. Even if there were explanatory text, Erika, like most users, doesn’t typically read through every dialog box, and they certainly can’t be expected to remember this technical detail a year from now.