SAB_WRITE(sc, SAB_IPC, SAB_READ(sc, SAB_IPC) & ~SAB_IPC_VIS);
sabtty_cnpollc(sc, on)	struct sabtty_softc *sc;	int on;{	u_int8_t r;	if (on) {		if (sc->sc_polling)			return;		r = sc->sc_pollrfc = SAB_READ(sc, SAB_RFC);		r &= ~(SAB_RFC_RFDF);		SAB_WRITE(sc, SAB_RFC, r);		sabtty_cec_wait(sc);		SAB_WRITE(sc, SAB_CMDR, SAB_CMDR_RRES);		SAB_WRITE(sc, SAB_IPC, SAB_READ(sc, SAB_IPC) | SAB_IPC_VIS);		sc->sc_polling = 1;	} else {		if (!sc->sc_polling)			return;		SAB_WRITE(sc, SAB_RFC, sc->sc_pollrfc);		sabtty_cec_wait(sc);		SAB_WRITE(sc, SAB_CMDR, SAB_CMDR_RRES);		SAB_WRITE(sc, SAB_IPC, SAB_READ(sc, SAB_IPC) & ~SAB_IPC_VIS);		sc->sc_polling = 0;	}}