FDO_FRST
u_int8_t dor = FDO_FRST | FDO_FDMAEN | FDO_MOEN(0);
bus_space_write_1(t, h, FDREG77_DOR, FDO_FRST | FDO_DS);
drive | FDO_FRST | FDO_MOEN(drive));
bus_space_write_1(t, h, FDREG77_DOR, FDO_FRST | FDO_DS);
FDO_FRST | FDO_FDMAEN | FDO_DS);
status = FDO_FRST | FDO_FDMAEN;
bus_space_write_1(iot, ioh, fdout, drive | FDO_FRST | FDO_MOEN(drive));
bus_space_write_1(iot, ioh, fdout, FDO_FRST);
status |= FDO_FRST | FDO_FDMAEN;
bus_space_write_1(iot, ioh, fdout, FDO_FRST);