Routines
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CEC3: Start a pass: find the first object not yet drawn
Used by the routines at find_iy_entry and render_obj.
Re-entered after every object is drawn. Every entry before the first undrawn one is drawn, so comparing the candidate with only the entries after it covers every undrawn object.
process_remaining_objs CEC3 LD DE,objects_to_draw from the top of the list
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