Routines
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62C2: Move Percy Up
Used by the routine at MainGameLoop.
Move Percy up. Clamps to Y position 00 at the top of the screen.
Input
IX Pointer to Percy's state data
D Number of pixels to move
MovePercyUp 62C2 LD A,(IX+$01) Load A with Percy's Y position (*IX+01) - the number of pixels to move (from D).
62C5 SUB D
62C6 CP $A0 Jump to MovePercyUp_Store if Percy's new position is less than A0 (is Percy within the screen boundaries).
62C8 JR C,MovePercyUp_Store
Percy is outside of the screen boundaries!
62CA LD A,$00 Clamp Percy to Y position 00 (the top of screen).
MovePercyUp_Store 62CC LD (IX+$01),A Write Percy's updated Y screen position back to *IX+01.
62CF RET Return.
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