Diagrams from redesign 3, hand-written SVG
彭博社指出，IBM 股价今年 2 月累计跌幅已达 27%，为至少 1968 年以来最差单月表现。
，更多细节参见51吃瓜
requiring no allocation.
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:
No base class to extend, no abstract methods to implement, no controller to coordinate with. Just an object with the right shape.