cs1101_09A_lec04 - CS1101 Lec04 Hardware Input, Output...

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CS1101 Lec04   Hardware   Input, Output &  Ports Dr. Jiying Wang Semester A, 2009-10 Computer Science Department City University of Hong Kong
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CS1101 - Lec04 2 Objectives Define computer input and discuss input devices commonly used today and  explain how and when they are used Define computer output and discuss output devices commonly used today  Discuss the factors that affect the image quality on an LCD monitor Compare different types of printers available today List the features to be considered when choosing a printer List ports that are typically built into a PC, and for what devices Depict the requirements of hardware configuration according to different user  groups
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CS1101 - Lec04 3 Lec04-Q1:  for a SXGA display with True Color setting,  how much display memory is needed for one screen's  display? Lec04-Q2:  list 4 other names for graphic card Lec04-Q3:  what hardware devices are connected by  those circled ports? For you to explore after class 5 4 2 3 1
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CS1101 Lec04   Hardware  Input
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What is input? What is input?  CS1101 - Lec04 5
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CS1101 - Lec04 6 Input: From Person to Processor Input  – data or instructions entered into memory of computers Characters, numbers, images, audio and video Programs, commands, user responses An  input device is any hardware component that allows users to  enter data and instructions into a computer.  Three major types of  input devices: Keyboard type devices – converts user typed characters  into computer  readable form Pointing devices – control the position of cursor  or pointer on the screen Digitizing devices – converts other forms of data  into computer readable  form (binary digits)
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CS1101 - Lec04 7 Keyboards Keyboards Used to enter letters, numbers and  special characters Types of keyboards Standard keyboards - Based on the typewriter’s  QWERTY layout Ergonomic keyboards - To address possible medical  problems 
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CS1101 - Lec04 8 Keyboards  (continued) Types of keyboards Wireless/cordless keyboard - Communicate with a receiver  attached to a port on the system  unit through infrared (IR), radio  frequency (RF) or Bluetooth  connections Folding keyboard - Used with handheld devices Visual keyboard - Laser projection
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Keyboards for Mobile Devices Keyboards on mobile devices typically are smaller and/or have  fewer keys Some phones have predictive text input, which saves time when  entering text using the phone’s keypad CS1101 - Lec04 9
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CS1101 - Lec04 10 How Keyboards  Work?
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CS1101 - Lec04 11 Pointing Devices pointing device  is an input device allows a user to control a  pointer (a small symbol) on the screen Mouse  Touchpad
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This note was uploaded on 03/10/2012 for the course CS 1101 taught by Professor Drxue during the Spring '11 term at City University of Hong Kong.

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cs1101_09A_lec04 - CS1101 Lec04 Hardware Input, Output...

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