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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:
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Фото: Nacho Doce / Reuters
在蓝箭航天，我国自主研制的朱雀三号重复使用液氧甲烷运载火箭，正为二季度的回收复用试验做着最后的准备。“尽管去年底的首飞未能实现软着陆，略有遗憾，但我们获取了真实飞行场景下的上千项关键数据，为后续研发积累了宝贵经验，迈出了关键一步。”蓝箭航天创始人张昌武说。