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A pattern of control is applied.
First, the beam is deflected
to aim at the top left corner
of the screen. Then it is moved
from left to right. When it hits
the right edge, it is turned
off, and aimed at the left edge
again, but a little bit lower.
Then it is once again swept from
left to right. This is repeated
over and over again until the beam
sweeps the bottom row from left to
right.  The whole procedure
happens again and again 60 times a
second. 
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   A monochrome picture is entirely
composed of dots, so anywhere there
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is to be a dot, the gun is
turned on during its sweep, and
where the picture is supposed
to be dark, it is turned off.
The dots slowly fade out. But
if the picture stays the same,
they are relit when the beam
comes across again. If the
picture changes, a new pattern
of dots are lit up. 
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   If you have a CGA monitor,
the graphics resolution is 640
dots across by 200 vertically.
Each sweep of the gun can
light up any of 640 locations
from left to right. The gun
makes a total of 200 sweeps
working from top to bottom. 
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~