Explain the functioning of Programmed I/O. What are its advantages and

Question

Explain the functioning of Programmed I/O. What are its advantages and disadvantages? For what kind of architecture would you like to use Programmed I/O? Explain when an I/O processoris needed in a computer system.

27 Apr 2023

Answer :

Word Count : 547

Programmed I/O, also known as PIO, is a basic input/output mechanism in computer systems where the CPU directly controls data transfer between the I/O device and memory. It involves the CPU executing programmed instructions to initiate and manage I/O operations.

The functioning of Programmed I/O can be summarized in the following steps:

1. I/O Command: The CPU issues an I/O command, such as read or write, to the I/O device.

2. Data Transfer: The CPU transfers data between memory and the I/O device by utilizing load and store instructions. It reads ______ _______ ____ ___ ___ _____ __________ __________.
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