ICT Section One - Input devices

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Keyboards - Most common input device.
QWERTY keyboards are made most common types of keyboards. First row of letters on a keyboard. Each key is connected to switch. Then sends a signal to CPU. They are based on typewriters.
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Concept Keyboards - Faster and more limited.
Found in shops and restaurants. Each switch has a symbol and when pressed it shows price. In restaurants when pressed it sends a message to the stock-control system and kitchen.
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Mice
Usually 2 or 3 buttons. It can be clicked or double click when on a icon, it can also be held down and dragged.. Mice tells computer direction and speed they are pushed, used to move pointer on screen.
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Touch pads or trackballs
You move your finger across the touch pad to move the pointer, use less space than a mouse. Don't work if you wear gloves.
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Trackballs
Works like a ball mouse, balls moved by hand, taking up less space. They're quite fiddly and not that accurate or quick
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Pointing sticks
Work by putting a finger and them and pushing in a certain direction which moves the pointer. They're really small, not very accurate and a bit wired.
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Graphic tablets
Made of touch sensitive surface and a rigid stylus. User presses on the surface and the pad registers its position, displaying it on screen.
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Joystick
Mainly used to play computer games. But can be used to move computer-controlled objects like robots or hospital body scanner. Joy stick is fixed on a based but can move in any direction. Computer get info from sensors, updating screen display.
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Scanners
Scanner converts picture into digital data. different parts of picture
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OCR Software
OCR stands for Optical Character Recognition, they take scanned digital information and look for familiar patterns that might make up letters or numbers. It then creates a text file which can be edited. It quick and easy to enter large blocks of text
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OCR Software cont...
But the software is not always perfect, so the results need to be proof-read.
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OMR Softwares
OMR stands for Optical Mark Recognition, it's used in schools to take class registers. Different boxes are filled in. A scanner reads the carbon in the box. System is quick and accurate if filled in properly.
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Chips
PIN cards have computer chips which store account information and the cards PIN number in encrypted form. To use the card you have to type in the PIN. Before PIN chips info was stored on magnetic strips. New cards have chips and magnetic strips.
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Other cards in this set

Card 2

Front

Concept Keyboards - Faster and more limited.

Back

Found in shops and restaurants. Each switch has a symbol and when pressed it shows price. In restaurants when pressed it sends a message to the stock-control system and kitchen.

Card 3

Front

Mice

Back

Preview of the front of card 3

Card 4

Front

Touch pads or trackballs

Back

Preview of the front of card 4

Card 5

Front

Trackballs

Back

Preview of the front of card 5
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