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INPUT AND OUTPUT DEVICES PAGES 28-38 (GRAPHICS TABLET (ADVANTAGES: it can…
INPUT AND OUTPUT DEVICES PAGES 28-38
GRAPHICS TABLET
ADVANTAGES: it can record levels of pressure and offer a very accurate method of drawing.
DISADVANTAGES: more expensive than other pointing devices and touch screen are easily damaged.
USES: used to produce drawings, computer graphics and used in computer-aided design work.
WEBCAMS
ADVANTAGES: allows people to stay in contact and can be left on constantly.
DISADVANTAGES: limited features and often poor quality, and need to be connected to the computer.
USES: enable video conferencing to take place.
LIGHT PENS
ADVANTAGES: small/ portable and easy to use technology.
DISADVANTAGES: lag problems when drawing on screen and not that accurate when drawing
USES: drawing on screen and selecting objects on CRT screens
DIRECT DATA ENTRY (DDE) DEVICES
MAGNETIC STRIPE READERS
ADVANTAGES: no moving parts and not affected by oil, water.
DISADVANTAGES: does not work at a distance and if it gets damaged data is lost.
USES: on credit/ debit cards and security devices to allow entry to buildings, hotel rooms...
CONTACTLESS CARDS READERS
ADVANTAGES: faster transition and retailers no longer have access to customers card information
DISADVANTAGES: more expensive tan normal credit/ debit cards and transitions limited to small minimum value
USES: pay without having to put your PIN number.
CHIP AND PIN READERS
ADVANTAGES: more secure systems and more robust system than magnetic stripe cards.
DISADVANTAGES: fraud- need o be careful to ensure PIN isn't read by somebody.
USES: where payments are made using cards.
RADIO FREQUENCY IDENTIFICATIONS READERS (RFID)
ADVANTAGES: very fast read rate and very robust and reliable technology.
DISADVANTAGES: easy to hack intpo the data and more expensive than a comparable barcode system
USES: livestock tracking and libraries use them to know if a book has left the library or not.
MAGNETIC INK CHARACTER RECOGNITION/READER (MICR)
ADVANTAGES: greater security than OCR since characters cannot be changed and there is no manual input, so errors are reduced.
DISADVANTAGES: more expensive than other methods used in direct data entry and only certain characters can be read.
USES: mainly used to process cheques in banking operations.
OPTICAL MARK RECOGNITION/READER (OMR)
ADVANTAGES: more accurate than OCR methods and more accurate than keying in the data.
DISADVANTAGES: forms need to be carefully designed to make sure the marks are correctly positioned and there can be problems if checked are not filled correctly.
USES: to read questionnaires, multiple-choice examinations papers and many other types of form.
OPTICAL CHARACTER RECOGNITION (OCR)
ADVANTAGES: much faster data entry system than manually keying in data and number of errors is reduced
DISADVANTAGES: system still has difficulty reading handwriting and not a very accurate technique.
USES: processing of passports and identity cards
MONITORS
ADVANTAGES: angle of view is still better than with most TFT monitors and they work this light pens.
DISADVANTAGES: tend to be rather heavy and run hot and can cause fires if left unattended.
USES: as the primary output device for computers and used with light pens.