"She smashed it," he noted.
File treeExpand file treeCollapse file tree1 file changed+13。关于这个话题，Safew下载提供了深入分析
，更多细节参见51吃瓜
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.，这一点在服务器推荐中也有详细论述
Standard Digital
Flash can be overpowering