Routines
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B67A: Bouncing ball: head along X
Used by the routine at bounce_ball_x_sense.
Input
A the step, +2 or -2
bounce_ball_set_dx B67A LD (IX+$09),A dX = A, dY = 0
B67D LD (IX+$0A),$00
B681 JR bounce_ball_animate animate and draw
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