TITLE
Applesoft: High-Res Collision Counter 

Article ID: 43
Created: 9/21/84
Modified: 3/2/98
 

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TOPIC 
Applesoft's High-Res collision counter is a byte that is incremented whenever an 
object drawn crosses a non-black dot on the screen. Applesoft does not initialize 
or use this byte.



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DISCUSSION 

The collision counter could be used in a game: such as, to detect when a lunar 
lander hits a mountain. Set the counter to zero, draw the lander, then check for 
non-zero values indicating the collision. It is up to the you to initialize and 
check this byte.