Hurdle Word 1 hintA thin atmospheric layer.
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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Nature, Published online: 26 February 2026; doi:10.1038/d41586-026-00158-y
In addition, it allows a WebAssembly module to be loaded directly from a script tag using type=”module”:
Dorsey announced the layoffs on X, citing AI as the main reason behind the move.