Chapter 5 Input and Output By: Chris Denman

Input -Any data or instructions that are used by a computer Input Devices -Translate words, images, and actions that people understand into a form a computer can process

Keyboards Traditional, natural, and folding or flexible keyboards have various types of keys including toggle and combination keys

Pointing Mouse-pointing device on a computer Mouse-pointing device on a computer Joystick-control game action by varying pressure, speed, and direction Joystick-control game action by varying pressure, speed, and direction Touch screens-touching finger to screen to control operations Touch screens-touching finger to screen to control operations Light pens-directed at screen to control operations Light pens-directed at screen to control operations

Scanning Scanners convert images to digital data. There are two basic types of scanners. -Flatbed scanner-like a copy machine -Portable scanner-handheld device that slides directly across the image

Image Capturing Digital cameras-similar to traditional cameras except that images are recorded digitally on a disk or in the cameras memory rather than on film Digital video cameras-record motion digitally on a disk in cameras memory

Digitizing Devices  Graphic tablet-uses a special surface and penlike device to directly capture or trace images on the tablet  Digital notebook-uses a regular notebook placed over an electronic pad.The underlying pad records the movements of the pen as the user takes notes

Audio- input devices Discrete-speech recognition system- recognizes only individual words Continuous-speech recognition system- recognizes individual words and phrases in context, a key technology for the 21st century

Output Processed data or information from a computer. Output devices are hardware used to provide or create output from a computer

Monitors  Cathode ray tubes-placed on a system unit or directly on a desk. Primary advantages are low cost and high resolution  Flat panel monitors-used for portable computers and desktop systems  These are only a couple

Printers Ink-jet printer- sprays small drops of ink onto paper Ink-jet printer- sprays small drops of ink onto paper Laser-uses a laser beam to produce images Laser-uses a laser beam to produce images Thermal-uses heat elements to produce images on heat sensitive paper Thermal-uses heat elements to produce images on heat sensitive paper

Combination Input and Output  Fax machines-send and receive images via standard telephone lines  Multifunctional devices-combine capabilities of a scanner, printer, fax, and copy machine  Terminals-input and output devices that connect to a host computer or server

Terminals  Dumb-sends and receives but does no processing  Intelligent-sends, receives, and processes  Network-low-cost alternative to intelligent terminal  Internet-access to the Internet without a microcomputer

The End