iPhone 17e also features C1X, the latest-generation cellular modem designed by Apple. C1X is up to 2x faster than C1 in iPhone 16e and matches the speed of iPhone Air. C1X uses 30 percent less energy than the modem in iPhone 16 Pro, contributing to the exceptional all-day battery life.
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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.