DAC_DATA
regwb(sc, DAC_DATA, r);
regwb(sc, DAC_DATA, g);
regwb(sc, DAC_DATA, b);
bus_space_write_1(fb->iot, fb->ioh, DAC_DATA, *cmap++ >> 2);
bus_space_write_1(fb->iot, fb->ioh, DAC_DATA, *cmap++ >> 2);
bus_space_write_1(fb->iot, fb->ioh, DAC_DATA, *cmap++ >> 2);