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.
Our editors’ favourite sporting images from the past week, from the spectacular to the powerful, and with a little bit of fun thrown in
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Almost all of South Australia, much of western Victoria and parts of western NSW were on flood watch as a slow-moving pressure system from central Australia moved east. Queensland had also seen severe rainfall.
Reporting from, 台北
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Late summer rain is causing havoc across Australia, with South Australia on flood watch, Victoria cleaning up after a downpour, and Sydney issuing a shark warning after heavy falls.