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52466: Reverse Speed Y
Used by the routine at RunHomingCreature.
Reverses the stored speed of a creature along y.
Input
IX Object record
ReverseSpeedY 52466 LD A,(IX+21) Fetch the stored speed along y.
52469 NEG Reverse it.
52471 LD (IX+21),A Store it.
52474 RET Return.
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