Routines
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CBE9: Shorten dY against the other objects
Used by the routine at dX_done.
adj_dX_for_obj_intersect for Y: an object has to overlap in X (after the accepted dX) and in Z to be in the way. Stopping sets bit 1 of +$0C.
Input
IX the moving object
L dY
C dX as accepted
H dZ as accepted
L on exit, dY shortened
adj_dY_for_obj_intersect CBE9 LD IY,$5C08 IY = the first record; forty of them
CBED LD B,$28
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