In a programmed input/output(PIO) __________

A. the CPU uses polling to watch the control bit constantly, looping to see if a device is ready

Question #86 of 1,002+ in Operating System

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A the CPU uses polling to watch the control bit constantly, looping to see if a device is ready Correct

B the CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available

C the CPU receives an interrupt when the device is ready for the next byte

D the CPU runs a user written code and does accordingly

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