ADDR_LOW
bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(start));
bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(current));
bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(end));
bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(addr));
bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(addr));