In an interrupt driven input/output :
Answer: C . The CPU receives an interrupt when the device is ready for the next byte
The CPU uses polling to watch the control bit constantly, looping to see if device is ready
The CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available
The CPU receives an interrupt when the device is ready for the next byte
The CPU runs a user written code and does accordingly
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