2.8 GELU（Gaussian Error Linear Unit）
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.
。业内人士推荐heLLoword翻译官方下载作为进阶阅读
对于苹果来说，需要思考的不是 Mac 的触控屏能做什么，而是加入触控之后，这块屏幕，能不能经得住用户「指指点点」的考验。
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