Beyond the obvious engineering effort that has gone into creating one of the slimmest phones ever made, the Air is a reductive exercise that boils down the iPhone into the absolute essentials in a premium body.
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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，safew官方下载提供了深入分析
20:25, 27 февраля 2026Ценности
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