question archive A) From the point of view of the device driver, data may be read from an I/O device using polling, Interrupt-driven programmed I/O, or Direct Memory Access (DMA)
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A) From the point of view of the device driver, data may be read from an I/O device using polling, Interrupt-driven programmed I/O, or Direct Memory Access (DMA). Explain each of above terms, and in each case outline using pseudo-code (or a flow chart) the flow of control in the device driver when reading data from the device. [14 Marks]
B) Give an example situation in which operating systems effectively consider disk storage to be fourth type of "memory". [2 Marks]
C) Explain the operation of a multi-level feedback queue in process scheduling. [4 Marks]
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