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When VM=1, the protected-mode bit goes low and the Entry PLA selects real-mode entry points -- MOV ES, reg takes the one-line path. Meanwhile, CPL is hardwired to 3 whenever VM=1, so the V86 task always runs at the lowest privilege level, under full paging protection. The OS can use paging to virtualize the 8086's 1 MB address space, even simulating A20 address line wraparound by mapping pages to the same physical frames.
。关于这个话题，夫子提供了深入分析
當時，愛潑斯坦是一名資產管理人和環球社交圈中的富豪，與當時的女友麥克斯韋共同在白金漢宮與棕櫚灘等地穿梭，結交世界各地的權勢人士。
Publication date: 28 February 2026