SCI_ICMD_ATN
icmd = SCI_ICMD_ATN;
icmd |= (SCI_ICMD_DATA | SCI_ICMD_ATN);
icmd |= (SCI_ICMD_ATN | SCI_ICMD_DATA);
icmd &= ~SCI_ICMD_ATN;
NCR5380_WRITE(sc, sci_icmd, (icmd | SCI_ICMD_ATN));