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31168: Initialise Spider
Used by the routine at Handler_Spider.
Resets the spider to its starting position, height and direction.
Input
IX Pointer to the spider sprite data
Initialise_Spider 31168 LD (IX+1),70 Write 70 to *IX+1 (initial height).
31172 LD (IX+0),72 Write 72 to *IX+0 (X position).
31176 LD (IX+2),0 Write 0 to clear *IX+2 (sprite active flag).
31180 XOR A Write 0 to *Spider_Direction_Flag to set the direction to ascending.
31181 LD (31185),A
31184 RET Return.
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