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Lesson 1B Introduction to Computers Keyboard Primary input device for entering text and numbers Standard Keyboards Have Five Groups of Keys Alphanumeric keys Modifier keys Numeric keypad Function keys Cursor-movement keys Click to Enlarge Mouse
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Lesson 1B Introduction to Computers
Keyboard • Primary input device for entering text and numbers
Standard Keyboards Have Five Groups of Keys • Alphanumeric keys • Modifier keys • Numeric keypad • Function keys • Cursor-movement keys Click to Enlarge
Mouse • An input device that rolls around on a flat surface and controls the pointer
Pointer • Also called the mouse pointer • An on-screen object for selecting text; accessing menus; and interacting with programs, files, or data
Other Pointing Devices • Trackball • Trackpad, also called a touchpad • Joystick, also called an integrated pointing device, 3-D point stick, or TrackPoint
Alternative Input Devices • Devices for the hand • Optical devices • Audiovisual devices
Monitors • Cathode ray tube (CRT) • Flat-panel. Most common flat-panel is the liquid crystal display (LCD) monitor
Two Main LCD Categories • Passive matrix LCD • Active matrix LCD
Four Things to Consider When Monitor Shopping • Size • Resolution • Refresh rate • Dot pitch
Video Controller • An intermediary device between the CPU and the monitor
Sound Card • Translates digital sounds into the electric current that is sent to the speakers
Printers • Impact • Nonimpact
Four Things to Consider When Printer Shopping • Image quality, measured in dots per inch (dpi) • Speed, measured in pages per minute (ppm) • Initial cost • Cost of operation
Examples of Printers • Dot matrix • Ink jet • Laser
Lesson 1B • Interacting With a Computer