Discussion
Which one of the following statements is FALSE?
Answer: C
The FALSE statement is Programmed I/O has better CPU utilization than interrupt driven I/O.
In programmed I/O the CPU repeatedly polls the device status and waits while the device is busy, so it wastes cycles doing nothing useful. Interrupt driven I/O lets the CPU do other work and respond only when the device signals readiness, so it uses the CPU better, not worse.
The other statements are true. In cycle stealing the DMA controller takes the bus for one word at a time. Burst mode transfers a whole block while holding the bus, so it has higher throughput for bulk data. With vectored interrupts the device supplies the address of its service routine, so the CPU need not poll to find the source and can start the routine sooner.
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