Question

Explain if the priority method is not used, then what other possible method can be used to effectively access I/O devices. Give proper diagram and explanation of working.

Answer 1

Dual bus scheme

Both the CPU and the I/O module have individual buses.

The CPU carries out its memory operations on the system bus, and the I/O processor has a dedicated I/O bus for its I/O operations.

Such a multiprocessor system is called “loosely coupled system”.