June 2014
Beginner to intermediate
208 pages
7h 14m
English
Content preview from Computer Interfacing
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The computer keyboard and
VDU
The light pen
This device, made in the shape of a pen, is used to point
at some object of interest on the VDU screen. Because of
the way in which the display is produced (the basic elec-
tron beam scanning process), there is a known time
relation between the commencement of the scan and the
position of the point at which the light pen is aimed. This
makes it possible to identify what exactly the light pen
is looking at. Provision for the light pen facility may be
included in a special cathode ray tube controller IC, such
as the 6845.
As an example of its use, suppose that a number of op-
tions in a program are represente ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.