NCRCFG1_BUSID
sr[NCR_CFG1] = NCRCFG1_SLOW | NCRCFG1_BUSID;
sr[NCR_CFG1] = NCRCFG1_PARENB | NCRCFG1_BUSID;
sc->sc_id = NCR_READ_REG(sc, NCR_CFG1) & NCRCFG1_BUSID;