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.
这也是月之暗面在大厂环伺背景下领悟到的生存法则：做小而美的生意，不在巨头的主战场上硬刚，只要技术飞轮转得足够快，企业的竞争优势就不容易被流量和资源所打破。
。爱思助手下载最新版本是该领域的重要参考
(e.g. custom) product. IBM probably regarded it as a prototype or pilot with
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