公式： f(x)=max(0,x)
One of the programs on these Beagle Bros floppies, and I can’t for the life of me remember which one, or in what context this happened, printed the following on the screen: “One day, all books will be interactive and animated.”
，这一点在WPS官方版本下载中也有详细论述
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Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.
“一些边缘户本来就晃晃悠悠，稍遇到点风险变故马上就可能致贫”，习近平总书记语重心长。