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IGCSE ICT chapter 2: Input and output devices
Terms in this set (22)
Manual input devices
Devices that require human intervention to enter data
Direct input devices (Direct data entry)
Data is entered directly without human intervention. Usually when large amounts of similar data need to be entered
Optical Mark Recognition (OMR)
Uses optical mark reader to detect marks made in certain places on specially printed forms. Usually when imputting data from answer sheets or registration forms
Magnetic ink character recognition (MICR)
Uses a magnectic ink character reader to input characters that have been printed in special magnetic ink. Usually used to process bank cheques
Optical Characters Recognition (OCR)
Use a scanner and software to convert text or embedded images into a format that can be edited by a word process. Usually when reading typed postcodes
A set of lines of different thicknesses that represent a number. It is read using a bar code reading by shining a beam of light on the lines and detecting the amount of light that reflected back.
Magnetic Stripe Readers
Used to read magnetic stripe which is a thin band of magnetic tape found on the back of credit, debit card, identity cards and electronic key cards which can store data.
A chip on credit/debit cards to make them more difficult for hackers to read.
Used to input data based on temperature, light levels, pressure, ...
Used to convert analogue data to digital data that the computer can understand
Automatically collects data over a period of time without the need of human intervention. Usually used for weather monitoring, scientific experiments
Monitors (CRT and TFT)
An output device that display text, graphics and video
Dot Matrix Printers
Use a set of pins to press an inked ribbon against the paper to create colored dots. The dots' patterns can be controlled.
Work by squirting ink at the page out of nozzles, one for each color used. They are quiet to operate and produce good-quality colored hardcopy
Use a laser to 'draw' the required outputs onto a drum. They produce high-quality hardcopy at high speed.
Use a pen to draw accurate line drawings. Usually used in computer-aided design (CAD).
Two types of plotter are:
Used to output music, voices and sounds from computers
Speakers used in control applications
Used to change physical value in response to a command from a computer
Examples of control devices:
- Motors to operate machines,...
- Buzzers to sound warnings
- Heaters to increase temperature
- Lights used as signals to the user
- Lights as output devices to provide light in a greenhouse,...
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