Radio Shack TRS-80 Model 100 Basic Manual page 124

Execute the program and it will display the alphabet in lower case:
abcdefghijklrnnopqrstuvwxwz
Ok •
There are quite a few other characters which can be displayed in a similar manner.
Change line 10 to
10 FOR I
=
0 TO 255
~
and execute it. You should hear a beep, see the display clear and finally see several
lines of characters displayed. Notice that the upper and lower case letters, the digits
(0-9) and all the punctuation (comma, period, etc.) are displayed along with many
other special characters (copyright symbol, graphics, and other language characters).
Not all of the ASCII values correspond to characters which can be displayed. Some of
them are control codes which perform different functions, such as line feed, carriage
return, sound, clear the screen and so on. For a complete list of ASCII values, refer to
the Appendix in your Model 100 Owner's Manual.
Delete the current program from memory with the NEW command and type the
following program:
10 INPUT "ASCI I VALUE";A
20 PRINT CHR$(A)
30 GOTO 10
Execute the program and enter an ASCII value of 7 when prompted to do so. You
should hear a beep. This is because the program prints CHR$(7), and the ASCII value
of 7 corresponds to the sound function. The program contains a loop back to line 10,
so you will be prompted to enter another ASCII value. Enter a value of 12 and the
display will clear. Enter a value of 132 and the graphics character:
for a racing car will display. Enter a value of 172 and the fraction:
114
will be displayed. Experiment on your own with other ASCII values. You will have to
press
~
to terminate execution of the program.
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