寻根记:一个离散家族的中国往事与南洋伤痕

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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.

71.7 x 149.6 x 7.2 mm

非遗里的中国年。关于这个话题,同城约会提供了深入分析

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