Types of input and output devices
- 1. 1 MODULE 1 Input & Output devices
- 2. 2 Input Devices • Input is all information put into a computer. • Input can be supplied from a variety of sources: – A person – A storage device on computer – Another computer – A peripheral device – Another piece of equipment, such as a musical instrument or thermometer
- 3. 3 Input Devices… • Input devices gather and translate data into a form the computer understands. • Primary input devices: – Keyboard - Most common input device; used to type in commands and data. – Mouse or trackball: enhances user’s ability to input commands, manipulate text, images.
- 4. 4 Input Devices… • Scanners: are peripheral input devices which allow users to import: – Text – Graphics – Images • Specialized software aids in translating information into a format the computer can understand and manipulate.
- 5. 5 Input Devices… • Digital Cameras: are peripheral input devices that allow users to create pictures and/or movies in a digital format. –Some require specialized software to import images into the computer. –Some record digital images directly to a disk that can be read by the computer.
- 6. Some input devices • Mouse • Keyboard • Scanner • Touch pad • Light pen • Joysticks • Microphones • Digital Cameras • Touch Screen • Bar Code Reader • Trackball • CD-ROM 44
- 7. Output Devices Used to display processed information to the user either in softcopy or hardcopy Soft copy – output displayed on a computer screen. It is the primary output medium. E.g. Monitor, speaker, LCD projector Hard copy – output produced on paper or micro film. E.g. Printers, plotters, … 7
- 8. 8 Output Devices… • Monitors: are the most commonly used output device. • Most monitors use a bitmap display. – Allows user to resize the display. – Divides the screen into a matrix of tiny square “dots” called pixels. – The more “dots” a screen can display, the higher the resolution of the monitor.
- 9. 9 Output Devices… • Monitors are connected to a computer system via a port integrated on the video adapter or graphics card. • Graphics cards convert digital data output from software to analog data for display on monitors.
- 10. Output Devices… Printer • Most widely used output devices to prepare printed paper documents • There are Impact and Non-impact printers • Impact printers Form characters by striking an inked ribbon with hammers against paper E.g. Dot matrix printers & ink printers 10
- 11. Output Devices… • Non-impact printers: Form characters without physical contact between a printer and paper E.g. Laser jet printers Plotters capable of drawing complex shapes with multiple colors 11
- 12. Output Devices… • VDU • Flat screen monitors • Printer • Plotters • Speakers • Headphone • Projectors 12