Question: 1. List down the functions performed by an Input/output unit. 2. Why does the DMA get priority over CPU when both request memory transfer?

1. List down the functions performed by an Input/output unit. 2. Why

1. List down the functions performed by an Input/output unit. 2. Why does the DMA get priority over CPU when both request memory transfer? 3. Define interrupt. Also discuss different types of interrupt. 4. With a neat schematic diagram, explain about DMA controller and its mode of data transfer. 5. What are the different methods of synchronous data transfer? Explain in detail.

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