民心是最大的政治。唯有将人民置于最高位置，一切奋斗才有意义，一切政绩才有价值。
Фото: U.S. Navy / Reuters
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say DSD-1. I'm not sure if the name changed, if DSD-1 and DTD-1 were slightly
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.
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