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Mitchell Hashimoto Co-founder, HashiCorp，推荐阅读爱思助手下载最新版本获取更多信息
Some elements that fall outside of a design are tricky to retrieve.。关于这个话题，WPS官方版本下载提供了深入分析
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.