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67D0: Reverse Horizontal Speed
Used by the routine at HandlePikeAndTinCan.
Makes the actor move the other way horizontally.
Input
IX Actor
ReverseHorizontalSpeed 67D0 LD A,(IX+$04) Fetch the horizontal speed.
67D3 NEG Reverse the direction by negating the speed.
67D5 LD (IX+$04),A Update the horizontal speed.
67D8 RET Return.
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