Intel documentation describes the 386's Protection Test Unit as a component that "implements fast testing of complex memory protection functions." It is mostly composed of a PLA (Programmable Logic Array), referred to as Test PLA by Intel, that is physically visible by its regular appearance on the die. This single piece of combinational logic replaces what would otherwise be dozens of multi-cycle conditional branches in the microcode. Instead of testing privilege rules sequentially, the microcode issues a single protection test operation, and the PLA evaluates all applicable rules in parallel, producing a complete decision in one evaluation: continue, fault, or redirect to a gate handler.
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，这一点在91视频中也有详细论述
Many scientists agree that it would be the best or perhaps only way to provide continuous power on the lunar surface.
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// 1. 创建桶（用链表数组模拟）。关于这个话题，WPS下载最新地址提供了深入分析