IER_EMSC          634 arch/i386/isa/pccom.c 		sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC;
IER_EMSC          407 dev/ic/com.c   		sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC;