Question

what are the basic advantages of using interrupted-installed data transfer over transfer under program control without an interrupt ?

Answer 1

Answer:

Reduced latency

Explanation:

The main advantage is reduced latency. The processor has to temporarily halt it's work in programmed I/O, whereas in interrupt I/O, the processor continues to perform and only halts when interrupt is received. Another advantage: in programmed I/O, the system cannot be under two I/O transfers.