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42440: Bounce Wandering Nastie Vertically
Used by the routine at HandlerWanderingNastie.
Reverses the Y velocity of a wandering nastie which has hit the top or bottom of the screen.
Input
IX Nastie record
BounceWanderingNastieVertically 42440 CALL ReverseYVelocity Reverse the Y velocity of the nastie.
42443 JR HandlerWanderingNastie_Move Jump to HandlerWanderingNastie_Move.
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