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- CHAPTER 2 – Hardware

- CHAPTER 2 – Hardware. Central Processing Unit. Understand the Term Central Processing Unit (CPU) and Know What the CPU Does. The CPU is the brains within your computer.

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- CHAPTER 2 – Hardware

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  1. -CHAPTER 2 –Hardware

  2. Central Processing Unit

  3. Understand the Term Central Processing Unit (CPU) and Know What the CPU Does • The CPU is the brains within your computer. • It performs most of the calculations within the computer and is responsible for the smooth running of your operating system (Microsoft Windows) as well as your application programs, such as word-processors, spreadsheets and databases. • It is divided into 2 logical parts: • CU (Control Unit) • ALU (Arithmetic/Logic Unit)

  4. Input Devices

  5. Devices for Inputting Data • The Mouse • Used to ‘drive’ Microsoft Windows • The Keyboard • The keyboard is still the commonest way of entering information into a computer • Tracker Balls • an alternative to the traditional mouse and often used by graphic designers

  6. Devices for Inputting Data • Scanners • A scanner allows you to scan printed material and convert it into a file format that may be used within the PC • Touch Pads • A device that lays on the desktop and responds to pressure • Light Pens • Used to allow users to point to areas on a screen • Joysticks • Many games require a joystick for the proper playing of the game

  7. Devices for Inputting Data • Voice Input for PCs • Such as Microphone. • Web Cams • For sound and Video communication. • Digital Cameras • To store pictures digitally on disks.

  8. Output Devices

  9. Common Output Devices • VDU (Visual Display Unit) • The computer screen is used for outputting information in an understandable format for humans • Things to consider in screens: • Normal vs. Flat Screens • Size (diagonally) • VGA (256 colors, 640x480 dots max.)”VIDEO GRAPHIC ARRAY” • SVGA (more colors, higher resolution) • XGA (even higher resolution) • Graphics for games. • Computer presentation Projection Devices.

  10. Common Output Devices • Printers • There are many different types of printers. (Dot Matrix, Laser, Inkjet, DeskJet, Bubble Jet) • In large organizations laser printers are most commonly used due to the fact that they can print very fast and give a very high quality output. • Things to consider in printers: • Resolution • Resolution Image Enhancement • Printer Memory • Duplex Printing • Cost of printer peripherals (Toners)

  11. Common Output Devices • Plotters • A plotter is an output device similar to a printer, but normally allows you to print larger images. • Speakers • Enhances the value of educational and presentation products. • Speech synthesisers • Gives you the ability to not only to display text on a monitor but also to read the text to you

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