Routines
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CBD9: Shorten dX by one and try the same object again
Used by the routine at dX_obj_hit_test.
Returns from the whole scan once nothing of dX is left.
dX_obj_shorten CBD9 LD A,C shorter by a unit; none left, done
CBDA CALL shorten_delta
CBDD LD C,A
CBDE RET Z
CBDF JR dX_obj_hit_test
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