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Subjects | Fact sheet | Samples
Computing and the Internet: Sample images
compiler
The process of compilation; a program written in a high-level language is translated into a program that can be run without the original source being present.
(Image © Helicon)
e-mail system
The basic structure of an e-mail system. A message is sent via a telephone line and stored in a central computer. The message remains there until the recipient calls up the central computer and collects the message.
(Image © Helicon)
liquid-crystal display
A liquid-crystal display consists of a liquid crystal sandwiched between polarizing filters similar to polaroid sunglasses. When a segment of the seven-segment display is electrified, the liquid crystal twists the polarized light from the front filter, allowing the light to bounce off the rear reflector and illuminate the segment.
(Image © Helicon)
logic gate
The circuit symbols for the five basic types of logic gate: OR, AND, NOT, NOR, and NAND. The truth table displays the output results of each possible combination of input signal.
(Image © Helicon)
plotter
A flatbed plotter, which may be used to produce plans, graphs, and other drawings. The moving arm, holding a pen of the appropriate colour, travels over the surface of the paper.
(Image © Helicon)
system flow chart
A system flow chart describes the flow of data through a data-processing system. This chart shows the data flow in a basic
accounting system.
(Image © Helicon)
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