COM_WRITE
COM_WRITE(sc, com_ier, sc->sc_ier);
COM_WRITE(sc, com_mcr, MCR_IENABLE | MCR_DTR | MCR_RTS);
COM_WRITE(sc, com_data, c);
COM_WRITE(sc, com_ier, c);
COM_WRITE(sc, com_data, *sc->sc_txput);
COM_WRITE(sc, com_ier, sc->sc_ier);
COM_WRITE(sc, com_ier, sc->sc_ier);
COM_WRITE(sc, com_ier, sc->sc_ier);
COM_WRITE(sc, com_ier, 0);
COM_WRITE(sc, com_lcr, LCR_DLAB);
COM_WRITE(sc, com_dlbl, ospeed);
COM_WRITE(sc, com_dlbh, ospeed >> 8);
COM_WRITE(sc, com_lcr, LCR_8BITS | LCR_PNONE | LCR_STOPB);
COM_WRITE(sc, com_mcr, MCR_IENABLE | MCR_DTR | MCR_RTS);
COM_WRITE(sc, com_ier, sc->sc_ier);