I/O ORGANIZATION

Which I/O technique allows the CPU to execute other instructions while waiting for I/O operations to complete?

• Polling

• DMA

• Interrupts

• Programmed I/O

In polling, the CPU checks the I/O device status:

• When the interrupt occurs

• Randomly

• Continuously in a loop

• Only after an instruction cycle

What is the main advantage of using DMA over interrupt-driven I/O?

• Less hardware

• Lower power consumption

• Higher data transfer rate

• Simpler software

Which component controls data transfer in DMA?

• CPU

• DMA Controller

• I/O Device

• ALU

Polling is considered inefficient because:

• It’s too complex

• It consumes CPU time constantly

• It requires extra hardware

• It needs a DMA controller

What happens to the CPU during DMA data transfer?

• It stops all operations

• It manages the transfer

• It continues executing other instructions

• It goes into interrupt mode

Which I/O technique is best suited for transferring large blocks of data?

• Polling

• Programmed I/O

• DMA

• Interrupts

When does the CPU regain control after a DMA operation?

• Before data transfer

• After data transfer is complete

• During the transfer

• It never loses control

Which technique requires the CPU to periodically check device status?

• Interrupts

• DMA

• Polling

• Memory Mapping

Which of the following is least efficient for real-time systems?

• DMA

• Interrupts

• Polling

• Memory-mapped I/O