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input & output devices
This document discusses input and output devices for computers. It describes keyboards, mice, and other pointing devices as common input devices for entering data, software, and commands. It also discusses monitors, printers, and other devices as output mechanisms for displaying and printing processed data in text, graphic, audio, and video formats. The mouse is highlighted as the most widely used pointing device for selecting on-screen items.
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input & output devices
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- 2. Input Inputis any data entered into the computer’s memory. Types of input include: ◦ Data – Unorganized information (words, numbers, images, or sounds) that the computer converts to meaningful information ◦ Software – Programs transferred from storage devices to the computer’s memory ◦ Commands – Instructions that tell the computer what to do
- 3. Input Devices:Giving Commands Keyboard Mouse Other Pointing Devices
- 4. Keyboards ◦ Traditionalkeyboards Flexible keyboards Wireless keyboards The keyboard allows the computer user to enter words, numbers, punctuation, symbols, and special function commands into the computer’s memory. Flexible Keyboard Wireless Keyboard
- 5. Mouse ◦ Mechanical ◦Cordless or wireless ◦ Touch Screen Light Pen
- 6. The mouseis the most widely used pointing device. A mouse is palm sized. As the mouse is moved, its movements are mirrored by the on-screen pointer. Cordless mouse – Uses infrared signals to connect to the computer’s IrDA port; it must be within sight of the receiving port
- 7. What is Output? Outputis data that has been processed into a useful form.
- 8. Processed dataor information Types of output ◦ Text ◦ Graphics ◦ Audio & video Output devices ◦ Monitors ◦ Printers
- 10. Known asscreens or display screens Output referred to as soft copy Information on display device sometimes called soft copy Types of monitors: ◦ Cathode-ray tube (CRT) ◦ Liquid Crystal Display (LCD or flat-panel) LCD CRT
- 11. Monitor This is themost common output device.
- 12. ◦ Data projectors ◦High-definition television (HDTV)
- 13. What isa printer? Output device that produces text and graphics on paper Result is hard copy, or printout Features ◦ Color capability ◦ Speed
- 14. Ink-jet printer Laser printer ◦ Personal laser printers ◦ Shared laser printers Other printers ◦ Plotters ◦ Photo printers
- 15. Inkjet printer,also called a bubble-jet, makes characters by inserting dots of ink onto paper Letter-quality printouts Cost of printer is inexpensive but ink is costly Inkjet Printer
- 16. Laser printerworks like a copier Quality determined by dots per inch (dpi) produced Color printers available Expensive initial costs but cheaper to operate per page Laser Printer
- 17. A plotteris a printer that uses a pen that moves over a large revolving sheet of paper. It is used in engineering, drafting, map making, and seismology. Plotter Printer
- 18. Translates audioinformation into sounds that people can understand Computer component that produces music, speech, or other sounds Common devices ◦ Speakers ◦ Headphones
- 19.