NIOS Computer Science Chapter 1 – Anatomy of a Digital Computer Part 4

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Output Devices

Display Screen

  • A program is keyed in, the screen (which is similar to a television screen) displays the characters.

  • The user can read the program line by line and make corrections before it is stored or printed on a printer

  • Screen sizes differ from system to system.

  • The standard size is 24 lines by 80 characters. Most systems have provision for scrolling.


  • Printer is a device that prints text or illustrations on paper and in may cases on transparencies and other media.

  • Printer fall into the following categories.

Printer fall into the following categories.

(i) Ink-jet Printer

(ii) Laser Printer

(iii) Line Printer

(iv) Thermal Printer


  • Plotter is a device that draws pictures on paper based on commands from a computer.

  • Plotters differ from printers in that they draw lines using a pen

  • In general, plotters are considerably more expensive than printers.

  • Multicolor plotters use different-colored pens to draw different colors.

Sound Cards & Speakers

  • Sound cards are necessary for nearly all CD-ROMs and have become commonplace on modern personal computers.

  • All sound cards support MIDI, a standard for representing music electronically.


  • 3D audio is a technique for giving more depth to traditional stereo sound.

  • Typically, 3D sound, or 3D audio, is produced by placing a device in a room with stereo speakers.