Commodore VIC-20 User Manual page 69

Biue bars
with white
holes
Putting the RVS ON control character in front of the ball
symbol, causes the VIC to reverse the colors being used to
display each ball. The ball is normally blue and is surrounded
by white background. The reversal made the background blue
and the bail white.
Ball with
RVS OFF
(normal)
Placing the RVS OFF control character after the ball, tells
the VIC to reset the reversing of background and character
colors. That is like reversing the reverse, and you end up back
where you started. If the RVS OFF is not used, an
interesting effect is produced.
the reverse balls if need be. and enter this line:
1 PRINT l'
Type: RUN
When RVS OFF is not used, all the spaces on the screen
are reversed and become solid blocks. What an interesting
pattern maker the VIC can become. How about designing your
own textiles, or wallpaper, or floor tiles with the VIC? What can
you think to do with the VIC?
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