Texas Instruments TI-99/4A - Page 155

Your screen turned a series of colors as the pro
gram caused the computer to display all sixteen
of its screen colors (including solid black, which
may have caught you by surprisel).
SCREENS 2 AND 3
Do not clear your screen and do not turn off
your computer at this time. Go on to the next
exercise.
Now, let's try your computer's "voice" by mak
ing a simple change to the program that is in the
computer's memory. Type the following line:
45 CALL SOUND( 100,110*X,2)
Then press ENTER.
SCREEN 4
Now, type RUN and press the ENTER key.
This time, you heard sixteen different tones from
your TV set speaker as it displayed the colors.
There are many other BASIC commands that you
can use with the TI-99/4A. This introduction was
designed to provide an idea of how simple
BASIC programming can be. If you decide to
learn more about BASIC, a beginner's BASIC
manual comes with your computer. If you later
want to learn more advanced programming, you
may want to purchase a more detailed BASIC
reference text. BASIC programming is just one of
the many ways that you can enjoy using your
TI-99/4A.
154