Question

Which type of I/O does NOT use interrupts?

• A. Interrupt driven I/O
• B. Programmed I/O
• C. Direct Memory Access
• D. Daisy chaining

Hint:

Programmed I/O uses busy-wait loops instead of interrupts — less efficient than interrupt-driven I/O.

Answer 1

The Correct Option is B

Programmed I/O involves CPU polling the device status continuously, rather than being interrupted. This wastes CPU cycles but avoids using interrupts.