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CE72: Test one object for the draw list
Used by the routine at list_next_obj.
Part of list_objects_to_draw: an object is listed if its record is in use and its redraw flag is set.
list_test_obj CE72 LD A,(IX+$00) empty record?
CE75 AND A
CE76 JR Z,list_next_obj
CE78 BIT 4,(IX+$07) redraw flag (bit 4 of +$07) clear?
CE7C JR Z,list_next_obj
CE7E LD (HL),C add this index
CE7F INC HL
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