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.
一粒麦，生生不息。小麦构筑的碳水“宇宙”，是面食文化的灵魂所在，更撑起了主食界的半壁江山。眼下，在返青拔节的青绿间，小麦的故事一茬茬接续，中国人饭碗的根基也将愈加坚实。
。业内人士推荐爱思助手下载最新版本作为进阶阅读
p->scavange= 0;
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