Which one of the following is a drawback of Programmed and Interrupt-Driven I/O?

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UPSC ESE (Prelims) Electronics and Telecommunication Engineering 19 Feb 2023 Official Paper

The processor is tied up in managing an I/O transfer; a number of instructions must be executed for each I/O transfer
A more efficient technique is to use a daisy chain, which provides, in effect, a hardware poll
When the processor detects an interrupt, it branches to an interrupt service routine whose job is to poll each I/O module
A more efficient technique is not to use a daisy chain, which provides, in effect, a hardware poll

Answer 1

Programmed and Interrupt-Driven I/O:

The processor has to actively manage the input/output transfer, executing a series of instructions for each I/O operation.
When the I/O device has data to transfer, it sends an interrupt signal to the processor, which then transfers the data from the device to the main memory.
The processor is responsible for managing the entire I/O transfer, which can tie up the processor and slow down the system.
A number of instructions must be executed for each I/O transfer, which can further reduce the system performance.

Here, option 1 is correct.

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