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Question 3 [10 marks 1. What is memory mapped I/O? [1 mark] 2. Why DMA is an improvement over CPU programmed I/O? [1 mark] 3. Mention two advantages and disadvantages for using a single bus as a shared communication link between memory, processor and I/O devices. [2 marks] 4. The following parameters are used for processor overhead calculation for interrupt I/O and DMA. 1000 MHz CPU Interrupt handler takes 400 cycles Data transfer takes 100 cycle 8 MB/s, 16 B interface disk transfers data 50% of time DMA setup takes 800 cycles, transfer one 16KB page at a time a. Calculate processor overhead for interrupt I/O. [3 marks] Calculate processor overhead for DMA. [3 marks] b