「如今有更多美國人在工作，比我們國家歷史上的任何時刻都還要多」
The 80286 introduced "Protected Mode" in 1982. It was not popular. The mode was difficult to use, lacked paging, and offered no way to return to real mode without a hardware reset. The 80386, arriving three years later, made protection usable -- adding paging, a flat 32-bit address space, per-page User/Supervisor control, and Virtual 8086 mode so that DOS programs could run inside a protected multitasking system. These features made possible Windows 3.0, OS/2, and early Linux.。关于这个话题，快连下载安装提供了深入分析
Reporting from, 紐約。业内人士推荐夫子作为进阶阅读
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