Input Output Introduction

Input Output Devices

Input Devices

 Input devices are devices used to input data or information into a computer. For example scanner, keyboard, mouse, joystick etc.

Output Devices

 Output device is any electronic or electromechanical equipment connected to a computer and used to transfer data out of the computer. For example speaker, monitor, floppy disk, printer etc..


I/O devices can be roughly categorized as storage, communications, user-interface, and other
I/O devices can be characterized by behavior, partner, data storage.

I/O Bus connection
I/O Bus connection is  bus that connects the CPU to main memory on the motherboard. I/O buses, which connect the CPU with the systems other components, branch off of the system bus.

Input Output Module
Input output module is the part of a modular which input and output devices are connected. Such as :

• Interface to CPU and Memory
• Interface to one or more peripherals

Function Of Input Output Module

1. Control and Timing - CPU ask I/O module check status attached device,then I/O module tell the status, After that if device already,CPU request for data transfer lastly I/O module gathers the data and transfers to the CPU..
2.  CPU Communicating - Can use Command Decoding,data,status reporting and Address recognition for the devices connected to it.
3.  Device Communication - Involves command, status information and data transfer.
4. Data Buffering - To overcome speed mismatch.
5. Error Detection - Allow detecting such errors, Like paper jam,bad data etc.

Published by :

Syaqira Liyana Binti Ahmad Ghazali 

( B031310568 )