Commodore VIC-20 User Manual page 80

Now, type (his program:
1 POKE 36878, 15
2 FOR I = 128 TO 255
3 POKE 36875, I
4 FOR D = 1 TOirj
5 NEXTD
6 NEXT I
7 POKE 36875, 0
Take a little time to look at Ihe VIC's screen, and see if all of
the lines on it look just like these. If any line looks wrong, just
lype it over again. Make sure you include the line number. VIC
will automatically substitute the new line for your previous
version. To get a listing of the lines in your program, type:
LIST and press
If all the lines are OK, type:
RUN and press
and you will hear all 128 notes that the VIC can sing with this
voice. (If you don'!, recheck the lines as you typed them.) if you
want 10 hear the notes again, type:
RUN again, and press
Now that you have heard the notes that your VIC can make, we
wan! to explain a little bit about how it does all that.
Inside the VIC, the Video Interface Chip (which gives the VIC its
name) handles both sound and picture. It lets your VIC send
sounds to the speaker of your TV set. The volume of sound can
be adjusted by the volume control on the TV or from the VIC's
keyboard.
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