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.
551 MB RAM — 即使在配备 4 GB 内存的入门级设备上也能流畅运行
，详情可参考Line官方版本下载
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《台湾百科全书·历史》：《台湾百科全书》编辑委员会编著；中国大百科全书出版社出版。