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.
不过这种方案不是完美的——如果只点亮那些窄角发光像素，屏幕的分辨率和亮度会受到一些细微影响。
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回顾历史，1960年代，Boswell基金会提供120万美元匹配赠款，撬动居民募捐，建成了第一家医院；1988年，Sun Health基金会捐赠900万美元，建成第二家医院。截至目前，两大基金会累计筹集超过5亿美元，支撑着医院从无到有、从基础到现代化的每一步。