Performance tracking
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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Earlier this month, Waymo completed the first phase of testing in Nashville, Tennessee. Nashville will now see driverless taxis on its streets. Waymo testing is also underway in London, Washington DC, and Denver.