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business computer application. College of Business. University of Palestine. Instructor: Mr. Ahmed Abumosameh. Lecture 3.1. computer hardware. Components of Hardware. Input Devices
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business computer application College of Business University of Palestine Instructor: Mr. Ahmed Abumosameh
Lecture 3.1 computer hardware
Components of Hardware • Input Devices • The devices that are used to enter data and instructions into the computer are called input devices. The commonly used input devices now a days are: • Key board • Mouse • Touchpad • Track ball • Joystick • Light Pen • Digital Scanner • Digital Cameras • Microphone • Touch screen
What are the two types of input? • Data • Unprocessed text, numbers, images, audio, and video • Instructions • Programs • Commands • User responses
Input Devices • Key board • Alphanumeric Keypad • Numeric Keypad • Screen navigation & Editing Keys • Function Keys • Pointing Device • Used in GUI (Graphical User Interface) Operating system • Mouse • Track Ball • Touch pad
Input Devices • Joystick • It is also a pointing device which has small box with moving handheld stick and buttons. • Used to play games • Light Pen • It is a handheld pen shaped device • Digital Scanner / Image Scanner • Read image and text printed on paper and store them in computer.
Input Devices • Digital Cameras • Pictures • Video • Optical Readers • It use light source to read characters, marks printed on the paper • Bar Code Reader • Touch Screen • These are sensitive display screen, user can touch different areas of screen to operate • ATM Machines
Video Input • Process of entering full-motion images into computer • Digital video (DV) camerarecords video as digital signals
Video Input • PC video camerac—cDV camera used to capture video and still images, and to make video telephone calls on Internet • Also called PC camera • Web camc—cvideo camera whose output displays on a Web page
Video Input • What is videoconferencing? • Two or more geographically separated people who use network on Internet to transmit audio and video data • Whiteboard is another window on screen that can display notes and drawings simultaneously on all participants’ screens
Scanners and Reading Devices • What is an optical reader? • Device that uses light source to read characters, marks, and codes and then converts them into digital data • Optical character recognition (OCR)reads characters in OCR font • Optical mark recognition (OMR) reads hand-drawn pencil marks, such as small circles • Bar code scanner
Scanners and Reading Devices • What is a turnaround document? • Document that you return to the company that sent it • Portion you return has information printed in OCR characters
Scanners and Reading Devices • What is a bar code scanner? • Uses laser beams to read bar codes
Scanners and Reading Devices • What is a bar code? • Identification code that consists of a set of vertical lines and spaces of different widths • UniversalProductCode(UPC)
Scanners and Reading Devices • What are some widely used bar codes?
Scanners and Reading Devices What is amagnetic-ink character recognition (MICR) reader? • Can read text printed with magnetized ink • Banking industry almost exclusively uses MICR for check processing
Scanners and Reading Devices • What is a data collection device? • Obtains data directly at location where transaction or event takes place • Transmits data over network or Internet
Terminals • What is a point of sale (POS) terminal? • Records purchases, processes credit or debit cards, and updates inventory • Swipe credit or debit card through card readerc—creads customer’s personal data from magnetic strip
Terminals • What is an automatic teller machine (ATM)? • Self-service banking machine that connects to host computer through network
Biometric Input • What is biometrics? • Authenticates person’s identity by verifying personal characteristic • Fingerprint scanner captures curves and indentations of fingerprint • Hand geometry system measures shape and size of person’s hand
Biometric Input • What are examples of biometric technology? • Voice verification system compares live speech with stored voice pattern • Signature verification system recognizes shape of signature • Iris recognition systemreads patterns in blood vessels in back of eye • Biometric data is sometimes stored on smart card, which stores personal data on microprocessor embedded in card
Output Devices • Monitors • Categories of Monitors • Monochrome Monitors • Grayscale Monitors • Color Monitors • Types of Monitors • CRT (Cathode Ray Tube) Monitors • Flat-Panel Monitors – LCD (Liquid Crystal Display) • Touch screen Monitors
Output Devices • Printers • Impact Printers • Dot Matrix Printer • Daisy Wheel Printer • Non-Impact Printers • Inkjet Printers • Laser Printers • Plotters
Speakers and Headsets • What is voice output? • Computer talks to you through speakers on computer • Some web sites provide voice output, such as songs, quotes, historical lectures, speeches, and books • Internet telephony allows you to have conversationover Web
Other Output Devices • What is a facsimile (fax) machine? • Device that transmits and receives documents over telephone lines Stand-Alone fax machine
internal fax card in system unit external fax modem fax machine Other Output Devices • What is a fax modem? • Modem that allows you to send and receive electronic documents as faxes • Fax modem transmits computer-prepared documents
Other Output Devices • What is a multifunction peripheral? • Provides functionality of printer, scanner, copy machine, and fax machine • Sometimes called all-in-one devices • Advantage less space, less expensive, good for SOHO users • Disadvantage If the device breaks down, lose all functionality
Other Output Devices • What is a data projector? • Device that takes image from computer screen and projects it onto larger screen • Two types • LCD projectors uses liquid crystal display technology, lower quality image than DLP projectors • DLP (Digital light processing)projectors uses tiny mirrors to reflect light, bright and colorful image