Routines
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CD17: Shorten dY at the walls: distance from the centre
Used by the routine at clip_dY_test.
The loop for adj_dY_for_out_of_bounds.
clip_dY_to_walls CD17 LD A,(IX+$02) A = |Y + dY - $80|
CD1A ADD A,L
CD1B SUB $80
CD1D JR NC,clip_dY_test
CD1F NEG
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