June 2014
Beginner to intermediate
208 pages
7h 14m
English
Content preview from Computer Interfacing
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Computer interfacing
dite is the way in which the dot matrix characters are
actually sent to the screen in the required positions, and
then moved about at will.
A memory-mapped VDU
To understand what the above term means, it is neces-
sary to consider in more detail the layout of a VDU
screen. The smallest element that can be displayed is
the dot mentioned previously, which has the special
name pixel, a contraction of the term picture element.
The resolution of a screen may be expressed in pixels,
e.g. 640 (horizontal) by 200 (vertical). Another way is to
talk about so many columns by so many lines of text,
e.g. 80 columns by 25 lines. A moment' ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.