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67D9: Reverse Vertical Speed
Used by the routine at HandlePikeAndTinCan.
Makes the actor move the other way vertically.
Input
IX Actor
ReverseVerticalSpeed 67D9 LD A,(IX+$05) Fetch the vertical speed.
67DC NEG Reverse the direction by negating the speed.
67DE LD (IX+$05),A Update the vertical speed.
67E1 RET Return.
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