TAILIEUCHUNG - Lecture Introduction to computing - Lecture 4

This lesson examines several categories of alternative input devices and discusses the special uses of each. You may be surprised at how often you see these devices, and you may decide that an alternative device will be your primary means of interacting with your computer. | CSC 101 Introduction to Computing Lecture 4 Dr. Iftikhar Azim Niaz ianiaz@ 1 2 Last Lecture Summary I Parts of the Computer System Hardware Software Data People Information Processing Cycle Input Processing Output Storage 2 3 Last Lecture Summary II Computer Hardware Processor, Memory, Motherboard Input Devices Output Devices Communication devices Storage Devices Magnetic storage devices, Floppy Hard disk Optical storage devices, CD, DVD, Blu Ray Computer Software System software and Application software Computer Users 3 4 Using the input devices CPU is computer brain the input devices are its sensory organs From user point of view, input device are important Enables user to enter information and commands into the computer Two common input devices Keyboard Mouse 4 Input Devices Hardware used to enter data and instructions 5 5 6 Two Common Input Devices Keyboard Mouse 6 The Keyboard First peripheral to be used with computers The most common input device for inputting text and numbers About 100 keys Must be proficient with keyboard Skill is called keyboarding 7 Standard Keyboard Layout IBM Enhanced Keyboard with 101 keys 8 Five Groups of Keys Alphanumeric Keys Modifier Keys Numeric Keypad Function Keys Cursor Movement keys 9 10 Alphanumeric Keys Area of computer that looks like a typewriter Sometimes called QWERTY Keys having specific functions Tab Caps Lock Backspace Enter 11 Modifier Keys Shift Alt (Alternate) Ctrl (Control) Modify the input of other keys 12 Numeric Keypad usually located on the right side of the keyboard, Has 10 digits and mathematical operators (+, -, *, and /). also features a NumLock key On - forces the numeric keys to input numbers. Off - perform cursor movement control and other functions. 13 Function Keys labeled F l, F2, and so on in a row along the top of the keyboard. allow you to input commands without typing long strings of characters or navigating menus or dialog boxes. Each key's purpose depends on the program you are

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