sc_reg_msr
uint8_t v = bus_space_read_1(t, h, fdc->sc_reg_msr);
uint8_t v = bus_space_read_1(t, h, fdc->sc_reg_msr);
msr = bus_space_read_1(t, h, fdc->sc_reg_msr);
fdc->sc_reg_msr = FDREG77_MSR;
fdc->sc_reg_msr = FDREG72_MSR;
v = bus_space_read_1(t, h, fdc->sc_reg_msr);
uint8_t v = bus_space_read_1(t, h, fdc->sc_reg_msr);
uint8_t v = bus_space_read_1(t, h, fdc->sc_reg_msr);
msr = bus_space_read_1(t, h, fdc->sc_reg_msr);
fdc->sc_reg_msr = FDREG77_MSR;
fdc->sc_reg_msr = FDREG72_MSR;
v = bus_space_read_1(t, h, fdc->sc_reg_msr);
msr = *fdc->sc_reg_msr;
fdc->sc_reg_msr = &((struct fdreg_72 *)fdc->sc_reg)->fd_msr;
if ((*fdc->sc_reg_msr & (NE7_RQM|NE7_DIO|NE7_CB)) == NE7_RQM) {
i = *fdc->sc_reg_msr & (NE7_DIO | NE7_RQM | NE7_CB);
while (((*fdc->sc_reg_msr & (NE7_DIO|NE7_RQM)) != NE7_RQM) && i-- > 0)