Routines
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62D0: Move Percy Down
Used by the routine at MainGameLoop.
Input
IX Pointer to Percy's state data
D Number of pixels to move
MovePercyDown 62D0 LD A,(IX+$01) Load A with Percy's Y position (*IX+01).
62D3 ADD A,D Write A + the number of pixels to move (from D) back to *IX+01.
62D4 LD (IX+$01),A
62D7 RET Return.
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