danube_map.read = danube_read16;
danube_map.write = danube_write16;
danube_map.copy_from = danube_copy_from;
danube_map.copy_to = danube_copy_to;
danube_map.read = danube_read16;
danube_map.write = danube_write16;
danube_map.copy_from = danube_copy_from;
danube_map.copy_to = danube_copy_to;