Which one of the following statements is FALSE?

In the cycle stealing mode of DMA, one word of data is transferred between an I/O device and main memory in a stolen cycle
For bulk data transfer, the burst mode of DMA has a higher throughput than the cycle stealing mode
Programmed I/O mechanism has a better CPU utilization than the interrupt driven I/O mechanism
The CPU can start executing an interrupt service routine faster with vectored interrupts than with non-vectored interrupts

Correct answer: Programmed I/O mechanism has a better CPU utilization than the interrupt driven I/O mechanism

Solution

The statement is false because programmed I/O typically requires the CPU to actively wait for I/O operations to complete, leading to lower CPU utilization compared to interrupt-driven I/O, where the CPU can perform other tasks while waiting for interrupts.

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