Cs100 lec 3 cont2 hardware input & output )
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The document discusses hardware components for input and output devices. It describes various input devices like keyboards, pointing devices, pen input, and data entry scanners. It also describes output devices like display screens, printers, and other multimedia outputs for sound, voice and video. Input devices translate user input into digital signals while output devices convert processed digital data into human readable formats.
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Cs100 lec 3 cont2 hardware input & output )
- 1. Hardware Components Input Devices Output Devices
- 2. Input Devices - Consist devices that translate data into a form the computer can process Keyboard is a device that converts letters, numbers, and other characters into electrical signals that can be read by the computers processor. 2 types 1. Traditional computer keyboard (104 - 105 keys) 2. Specialty keyboards and terminals (touch tone telephone keypads to keyboards featuring pictures of food for use in fast-food restaurants
- 3. TRADITIONAL KEYBOARD SPECIALTY KEYBOARD
- 4. Pointing devices Control the position of the cursor or pointer on the screen 1. mouse and its variants:
- 5. trackball a movable ball, mounted on top of a stationary device, that can be rotated using your fingers or palm
- 6. pointing stick looks like a pencil eraser protruding from the keyboard between G, H, and B keys
- 7. touch pad a small, flat surface over which you slide your finger
- 8. 2. touch screen a video display screen that has been sensitized to received input from the touch of a finger
- 9. 3. Pen Input: Pen-based computer system allows users to enter handwriting and mark onto a computer screen by means of a penlike stylus rather than typing on a keyboard (ex. handheld and digital notebook)
- 10. Light pen a light-sensitive penlike device connected by a wire to the computer terminal
- 11. Digitizer uses a mouselike copying device called a puck, or an electronic pen, which can convert drawings and photos to digital data. (ex. digitizing tablet)
- 12. Source Data-Entry Devices Data are entered directly from the source. It creates machine-readable data on magnetic media or paper or feed it directly into the computers processor 1. Scanning devices . Scanners use light-sensing equipment to translate images of text, drawings, photos, and the like into digital forms. a. Imaging System
- 13. b. Bar-code reader
- 14. c. Mark-recognition and Character-recognition devices. c.1 Magnetic-ink character recognition (MICR)
- 15. c.2 Optical-mark recognition (OMR)
- 16. c.3 Optical-character recognition (OCR)
- 17. d. Fax machines d.1 Dedicated fax machines d.2 Fax modem
- 18. Source Data-Entry Devices 2. Webcam a camera that attaches to a computer to record moving images that can then be posted on a website in real time
- 19. 3. Digital cameras electronic camera that uses a light-sensitive processor chip to capture photographic images in digital form on a small diskette inserted in the camera or on flash-memory chip.
- 20. 4. Human biology-input devices . Characteristics and movements of the human body, when interpreted by sensors, optical scanners, voice recognition, and other technologies, can be form of input. a. Biometric system . b. Line of sight systems VOICE RECOGNITION FINGER SCANNER HAND SCANNER EYE SCANNER
- 21. Output Devices Consists of devices that convert machine-readable information, obtained as a result of processing, into people-readable form 2 types 1. Softcopy data that is shown on a display screen or is in audio or voice form 2. Hardcopy printed output Other Outputs
- 22. Softcopy a. Display screen also called as monitors 2 Types a.1 Cathode-Ray Tube (CRT)- is a vacuum tube used as a display screen in a computer or video display terminal
- 23. a.2 Flat-panel displays are made up of two plates of glass separated by a layer of a substance in which light is manipulated (ex. Liquid crystal display (LCD)
- 24. Hardcopy a . Impact Printer- forms characters or images by striking a mechanism such as a print hammer or wheel against an inked ribbon. (ex. Dot matrix)
- 25. b. Nonimpact Printers form characters and images without direct physical contact between the printing mechanism and paper. 3 Types b.1 Laser Printer
- 29. c. Plotters. 3 Types c.1 Pen
- 31. c.3 Large-format
- 32. d. Multifunction
- 33. Other Output: Sound, Voice, and Video 1. Sound Output devices produce digitized sounds, ranging from beeps and chirps to music. (ex. speaker)
- 34. 2. Voice Output Devices convert digital data into speech-like sounds. (ex. in telephone answering machine, cars, toys and games)
- 35. 3. Video Output video consists of photographic images, which are played at 15-29 frames per second to give the appearance of full motion.