NASA recently ended a manned mission to the International Space Station (ISS) a month early, citing a medical issue with one of the astronauts. The space agency just revealed that the impacted astronaut was Mike Fincke. This was the first medical evacuation in the history of the ISS.
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.
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