ICT revision

Input, Output

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  • Created by: Nayo
  • Created on: 12-05-10 09:41

Input

Keyboard -

Most common input device in most computer systems is the standard QWERTY keyboard.

Keys for all the letters - ESC, ALT, CTRL, SHIFT and the function keys.

Varations to layout in different countries and some keyboards will have extra keys (numeric keyboard)

Ergonomic Keyboards designed to reduce repetitive strain injury (RSI) - people used to standard may be find it weird to change shape.

Devices on mobile phones - smaller versions of keyboards - usually called keypads.

Use multiple key presses to select letters - full sized keyboard not practical in devices of this size.

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Mouse

Most common pointing device - used to move a pointer around the screen and select options by clicking.

Connected to computer via a cable or wirelessly

Two types of mouse - Mechanical OR Optical

Mechanical mouse - rolling ball and the computer senses its position on a flat surface. (Work best on a mouse mat)

Optical mouse - uses a light sensor to detect motion and does not need a mouse mat.

Both types of mouse - two or three buttons can be clicked and have a scroll wheel to make dragging and scrolling easier.

Trackball - same job as a mouse (has a ball on the surface)

Ball is rolled unsing fingers or the palm of hand. Used sometimes with laptop computers because they are easier in confined spaces.

Laptops have trackpads, user moves finger over sensitive plate controlling cursor.

Trackpoint (small button) that works like a joystick and sometimes seen on mobile phones, PDA's and laptops.

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Concept Keyboards

Diveded into areas - labelled to suit the actual use.

Special software interprets the key press for the computer. Used in checkout tills or restaurants

Can be used in checkout tils or resturants so the user can press the name of hte item sold rather than having to remember the price of it.

Keyboard may have a plastic film over it to protect from food and drink spills.

Concept keyboards - input devices for children or for people with disabilities. (small child hear a

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