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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.。关于这个话题，旺商聊官方下载提供了深入分析
Isis Wu, its president of global residential fire & safety, adds, "In the case of a fire, it'll send you an alert and it'll ask you to confirm before you call out the fire department."。im钱包官方下载是该领域的重要参考
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