SABTTYF_RINGOVERFLOW
sc->sc_flags |= SABTTYF_RINGOVERFLOW;
sc->sc_flags |= SABTTYF_RINGOVERFLOW;
sc->sc_flags &= ~(SABTTYF_DONE|SABTTYF_CDCHG|SABTTYF_RINGOVERFLOW);
if (flags & SABTTYF_RINGOVERFLOW)