Input and Output Devices

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A THOROUGH OVERVIEW OF INPUT AND OUTPUT DEVICES
PRESENTED BY THE MEMBERS OF GROUP B COMPUTER SCIENCE DPT.

INTRODUCTION
• The I/O devices as parts of the components of an information processing system or a computer system are those devices which enables the computer system to communicate with the outside world. As we all know from the concept of communications in English language that communication is said to have being completed only when the encoder (sender) must have received a feedback from the decoder (other user), this can only be possible only when there are good and effective communication gadgets to help fascinate this process. • Now, back to the concept of electronic information processing system (Computer system), we all know that communication between the computer system and the outside world (user) would be almost impossible if there are no adequate console I/O devices to enable the user send their commands (data) into the computer system for processing and also to get feedback (i.e. already processed data) through a good working console output device (monitor).

DEFINITION OF TERMS
• • INPUT DEVICES: These are those devices that enable the user to send data or commands into the computer for processing. OUTPUT DEVICES: These are those devices that fetch the user’s information or already processed data from the computer main-memory (RAM) through the console output device (monitor). I/O DEVICES: These are those devices that enable the computer to communicate with the outside world.






CONSOLE INPUT: These refer to those indispensable input devices that must be present in any computer system. e.g. Keyboard and mouse. CONSOLE OUTPUT: These refer to those indispensable output devices that must be present in any computer system. e.g. Monitor. Since there are so many I/O devices, we can now classify them into the following categories: Input Device and Output Devices, and also highlight their principle of operations, usage and limitations from the next page.



INPUT DEVICES
S/N 1 DEVICE NAME KEYBOARD PRINCIPLE OF OPERATION It is an input device which has numerical keypad, a bank of editing keys and a role of function keys. USAGE It is use to enter information in the computer, it can also be used to type command. LIMITATIONS Improper use or positioning of a keyboard can lead to a repetitivestress injuries

2

SMART CARD

Isolating any securitycritical computations with, CryptoAPI and Microsoft Win32® SCard APIs.

Authentication (PIN ),

Pin decryption, fraud, fire, humidity and heat.

3.

MAGNECTIC- Is a method of machineINK reading character made CHARACTER of magnetized particles RECOGNITION

It is use to read machine characters

The quality of printing the pre encoded information was not high or good the characters would not be easily read.

S/N DEVICE NAME

4

FLOPPY DISK

PRINCIPLE OF OPERATION Iron core wire wrapped around a controllable electromagnet.

USAGE Used for data transfer, small file storage and backup, software installation and driver updates.

LIMITATIONS It is primitive(old), the read and write head gets dirty, some wear and tear do occur also with magnetic oxide, slower speed in recording, can not contain large data storage. Can only be used by the kind of pencil for which it is designed to read from and one at a time.

5. OPTICAL MARK RECOGNITION READER Using a pencil you make It is used to score a mark in a special box certain tests or space that corresponds to what you think is the answer. The answer sheet is then graded by a device that uses a light beam to recognize the marks and convert them to computer recognizable electrical signals.

S/N DEVICE NAME

PRINCIPLE OF OPERATION

USAGE

LIMITATIONS

6.

OPTICAL CHARACTER RECOGNITION

Uses a light source to read special characters and convert them into electrical signals to be sent to the central processing unit Can be found on digital cameras and mobile phones.

It is...
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