1InputOutputCombination DevicesInputInput is any data or instructions used by a computer. Input devices translate words, images, and actions into a form computers can process. Devices include:•Keyboards•Pointing Devices•Scanners•Image Capturing Devices•Audio-Input DevicesInputKeyboardsKeyboards are the most common way to input data. The most common types include:•Traditional – full sized, rigid.•Flexible – rolls up, easy packing.•Ergonomic – minimize wrist strain.•Wireless – greater flexibility.•PDA – miniature keyboard.Features include numeric keypads, toggle, and combination keys.
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2InputPointing DevicesAccept pointing gestures and convert them to machine-readable input.•Mouse – controls a mouse pointer. A wheel button rotates to scroll through information. Three basic designs are mechanical, optical, cordless, trackball, touch surface, and pointing stick.InputPointing Devices (cont.)•Joysticks – Are popular for computer games. Operations are controlled by varying pressure, speed, direction.•Touch Screens – Have clear plastic layer over crisscrossed invisible beams. Operations are controlled by a finger touching the screen.InputPointing Devices (cont.)•Light Pens – Are light sensitive penlike devices. Operations are controlled by placing the light pen against the monitor.•Stylus – A penlike device used with tablet PCs, PDAs and graphic tablets. Handwriting Recognition Software translates hand-written notes.