Commodore VIC-20 User Manual page 54

The fourth line is:
4 PRINT B$ 1
This line tells the VIC to use the color it finds in the B$ box
and to draw the birdlike creatures with it. The command,
PRINT B$, creates the same effect as typing a specific color
control character. By using BS, however, we can have the
VIC change the color character automatically. As "N" (line 2)
changes, B$ changes (line 3), and the birds change color
wish
B$
would
make
up its
mind!
The VIC's ability to generate random numbers can be
combined with its color, sound, and graphics features in
many interesting ways. For example, let's revisit the VIC
Color Show, but randomly, and make some noise while we
are at it.
44
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