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Presentation on Input and Output Devices
Input devices such as keyboards and mice allow users to enter data into a computer. Keyboards allow text entry and have alphanumeric keys as well as special keys. Mice control cursor movement on screen and come in mechanical, optical, and cordless varieties. Optical scanners digitize text and images for computer use. Output devices such as monitors, printers, and speakers allow users to see and hear information from the computer. Monitors display soft copy output while printers produce hard copy printouts.
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Presentation on Input and Output Devices
- 4. n Do you ever wonderhow information gets into your computer and how comes out in a form you can use ? It is possible with
- 5. Input Devices Definition : “An electromechanical devicethat can be used to enter data and instructions into a computer.”
- 6. Keyboard “A keyboard isa human interface device which is represented as a layout of button or keys.” It has some Features as • Typewriter keyboard with numeric keypad • Special purpose keys • Toggle and combination keys
- 7. Definition : “An inputdevice used to control a pointer on the screen.” Mouse: “mouse can be used to Control and manipulate cursor movement on monitor.” Types of Mouse : i) Mechanical or wireless ii) Optical iii) Cordless
- 8. Some pointing devices are Trackball PointingStick Joystick Touch Pad Touch Screen Light Pen
- 9. Optical Input Devices “optical inputdevices that uses light as a source of input. They eliminate the need for manual entry of data, thus accuracy Scanner: increases. “scanners can be used to copy the image or text on paper into a digital format that can be used by the computer.”
- 10. Other Optical Input Devicesare: Optical scanners Flatbed Portable Bar code readers: “a barcode reader is an electronic device which is used for reading printed barcodes. This device directs a light beam across the bar code while it measures
- 11. Character and markrecognition devices Scanners that recognize special characters & marks Magnetic ink character recognition (MICR) Optical-character recognition (OCR) Optical-mark recognition (OMR)
- 12. Audio Input Definition : Devicesrecord the analog “audio input devices sound and convert it into digital form for further processing.” Some Audio input devices are : Voice recognition microphone Musical Instrument Digital
- 13. Video Input Definition : “video input devices that can be used to entering full motion recording into a computer .“ Some video input devices are digital camera video capture
- 14. Output Devices Definition “output devicescan be used to receive information from the computer “ The output can be in two forms: Soft copy Hard copy
- 15. Monitor Definition “a monitor isa peripheral device which displays computer output on a screen . Screen output is referred to as soft copy” Features Resolution-pixels Dot pitch Refresh rat Size Types of monitors Cathode Ray Tube (CRT) Liquid crystal Display (LCD)
- 16. Printer Definition “a printer isa peripheral device that produces a physical copy or hard copy of the computer’s output.” Types of Printer : Impact Printers • Dot Matrix Printer • Daisy Wheel Printer Non Impact Printers • Laser Printer • Ink-Jet Printer • Thermal Printer
- 17. Plotter Definition “a plotter isan output device that is used to produce high quality graphics in a variety of colors.” Types of Plotter Flatbed Plotter Drum plotter
- 18. Audio output Devices Definition “audio outputdevices can be used to translates audio information from the computer into sounds that people can understand.” Common audio output devices Speakers Headphones
- 19. Projector Definition “projector can beused to displays computer information on big screen so that many will able to see the show.”
- 20. Computer Output Microfilm (COM) This technology is used to record computer output as a microscopic film images. Information is recorded on a roll of film. COM devices are used applications where there are large volumes of data.
- 21. Combination Input and OutputDevices Many devices combine input and output capabilities Fax machines Multifunction devices Internet telephones Telephony and Voice-over IP (VoIP) known as Terminals
- 22. Fax machines Definition : “afax machine refers to a device or equipment that does telephonic transmission of scanned material. It scans the original document and converts it into a bitmap. It then uses electronic signals to send the document to another recipient. “
- 23. Terminals An inputand output device Connects to a mainframe or server Types of terminals Dumb terminal Intelligent terminal Network terminal Internet terminal