The 80386 introduced Virtual 8086 (V86) mode -- allowing real-mode DOS programs to run inside protected mode under OS supervision. While not full virtualization in the modern sense, V86 was the first practical hardware-assisted mechanism on x86 for running legacy software in a protected environment -- used widely in Windows 3.x and Windows 9x.
Both page table entries and segment descriptors have an Accessed bit that the hardware must set on use -- but the mechanisms are quite different.，推荐阅读雷电模拟器官方版本下载获取更多信息
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// Synchronous consumption — no promises, no event loop trips。谷歌浏览器【最新下载地址】对此有专业解读
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