JIO_OK ("jump if I/O OK") tests whether CPL ≤ IOPL. The same check gates PUSHF, POPF, INT n, and IRET. The monitor then emulates each instruction as appropriate: maintaining a virtual interrupt flag per V86 task, reflecting software interrupts through the real-mode interrupt vector table, virtualizing I/O accesses, and so on.
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That includes cuts to a significant number of science programmes such as the Mars Sample Return that aims to return samples from the planet's surface to Earth.
McKenzie will be based at BAS's headquarters in Cambridge for the remainder of the year, but he has previously overwintered in Antarctica. "When the winter comes, you feel this incredible sense of freedom as most people leave," he says.
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