wrt_fdc_reg
wrt_fdc_reg(fdctl, type->rate);
wrt_fdc_reg(fdout, 0);
wrt_fdc_reg(fdout, FDO_FRST);
wrt_fdc_reg(fdout, drive | FDO_FRST | FDO_MOEN(drive));
wrt_fdc_reg(fdout, FDO_FRST);
wrt_fdc_reg(fdout, status);
wrt_fdc_reg(fddata, x);