Lesson #12 Sound & Simulation - Radio Shack TRS-80 Model 100 Basic Manual

In this lesson you will learn how to create a wide variety of sounds, simulate events
using the built-in random number function, and cause apparent movement (animation)
on the display.
Lesson #12 Sound & Simulation
Experiment #1 Beep your Beeper!
You can use the built-in speaker to create sounds of many types: beeps, sirens,
whistles, clicks, and so on.
Sound can be used in a BASIC program to draw attention to some event - the
OCCurrence of an error, for example. It might also be used to liven-up a program by
adding noises to indicate movement. You might also want to use your Computer to
create music. All these uses of sound are fairly easy on the Model 100 as you'll find
in the following experiments.
You have already seen that printing CHR$(7) will sound the "bell" character. Try it
now to recall the sound:
PRINT CHR$(7) ~
Another way to make the same sound is to use the BEEP statement. Type:
BEEP
CEH.ml
and you will hear the same sound. To verify that the sounds are identical, enter
PRINT CHR$(7) : BEEP
and you will hear two beeps in succession.
You might want to use sound as a sort of warning. Try this:
FOR 1=1 TO 10 : BEEP : NEXT I ~
You can also vary the tone and duration of the sound using another statement as
shown in the next experiment.
Experiment #2 Sound OfT!
Create a tone by entering the following command:
SOUND 5588,100
You should have heard a tone lasting approximately two seconds and having a
frequency of 440 hertz. Increase the frequency of the tone by entering:
SOUND
4151100
or lower the tone by entering:
SOUND 15800,100
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