Commodore PET User Manual page 121

Program 1. CLEAN SCREEN. Have the program clear the screen before print-
ing the HIT A KEY message.
Program 2. MESSAGES. Have the program print "HIT A KEY" when the pro-
gram is first run but then have it print "HIT A KEY OR <R> TO END" for subse-
quent display.
Program 3. SINGLE. Combine the last two messages of the display onto one
line so that the program prints:
PHEW! HIT A KEY OR <R> TO END
---
10
spaces
Have this line print on the bottom line. Increase character lines printed to 24.
Program 4. CALLING YOU. Structure the program as a subroutine. Add a main
program that calls the subroutine and ends the program.
Program 5. SLOW DaWN. Slow down the display. The character display takes
about 16 seconds to print. Lengthen this print time to about double.
Program 6. SPEED UP. Speed up the program. The character display takes
about 16 seconds to print. Shorten this print time. The time can be shortened,
using PRINT, to about two seconds.
Hint: You will need to decrease the number of PRINTs.
Program 7. INDIAN BLANKET. Allow input and display of different characters
while the display is being printed. Modify messages as in Program 2, but with the
following messages:
HIT ANY KEY
HIT ANY KEY OR <R> TO END
At the same time slow down the display, as in Program 5, but make it even
slower to allow time to press different keys while viewing the display - slow to
about 75 seconds.
Remember when running the program that once vou press a key, it automat-
ically repeats until vou press the next key. Can vou get the display to look like an
Indian blanket?
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