ELCR0
ELCR_WRITE(ELCR0, icu_elcr & 0xff);
ELCR_WRITE(ELCR0, icu_elcr);
mp_busses[bus_id].mb_data = inb(ELCR0) | (inb(ELCR1) << 8);
level_inv = ((uint16_t)inb(ELCR1) << 8) | inb(ELCR0);