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:
do. (In fact, the new scheme at worst has to copy one more element
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copyright dates they must have been around by 1977.
To open a SpeedPro, that bet usually falls in the $234,000 to $350,000 total investment range, depending largely on lease and location. In return, owners get a relatively low headcount operation, a technology-forward product line and access to national accounts.
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