Output of Data

1
Output of Data

• Letts Chapter 5

2
Introduction

• An output device is a peripheral which receives
  data in the form of electrical pulses from the
  CPU. It then converts this data into information
  or into further data.
• Examples
• PC Screen
• A Printer
• A turtle

3
Output on Screens

• Display screens are being increasingly used for
  computer output.
• Their advantages are
• high speed change of display
• display can include text, graphics and colours
• no noise
• no waste of paper
• Their disadvantages are
• needs a separate device to produce a hard copy

4
Printers

• Printer types include
• character printers
• line printers
• page printers
• The main types of printer for general work are
• dot matrix Cheap to run and buy -noisy,
  quality poor
• ink jet Quiet, quality output, cheap - quality
  paper needed or smudges
• laser Quiet, excellent quality -cost high
  initially and for ink etc, not as good as ink
  jets for reproducing artwork and photos

5
Plotters

• Increasingly good quality graphics can be
  produced on printers but plotters are still
  needed for high quality work.
• Pen plotters are either drum plotters or flat-bed
  plotters. At the moment high quality work for
  publication is done on electrostatic plotters
  which are penless.

6
Other output methods

• Other output methods include
• output to magnetic tape cartridges and disks
• computer output on microfiche or microfilm (COM)
• voice synthesis
• electrical signals to control devices.