(Answered) 1 why do io devices place the interrupt vector on the bus

Engineering

1. Why do I/O devices place the interrupt vector on the bus? Would it be possible to store that information in a table in memory instead?

2. A computer uses DMA to read from its disk. The disk has 64 512-byte sectors per track. The disk rotation time is 16 msec. The bus is 16 bits wide, and bus transfers take 500 nsec each. The average CPU instruction requires two bus cycles. How much is the CPU slowed down by DMA?

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