圖像來源，Getty Images
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，更多细节参见WPS下载最新地址
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.
想法是脆弱的。如果它们已经被彻底解决，那就不再是想法，而是产品。要不被新想法带来的问题吞没，需要一种坚定的努力。问题很容易被清楚说出、被理解，它们会夺走氧气。史蒂夫会把注意力放在想法本身上，哪怕它不完整、甚至看似不太可能。