Routines
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CC28: Shorten dY by one and try the same object again
Used by the routine at dY_obj_hit_test.
Returns from the whole scan once nothing of dY is left.
dY_obj_shorten CC28 LD A,L shorter by a unit; none left, done
CC29 CALL shorten_delta
CC2C LD L,A
CC2D RET Z
CC2E JR dY_obj_hit_test
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