VALID_USER_DSEL
if (sel != 0 && !VALID_USER_DSEL(sel))
if (sel != 0 && !VALID_USER_DSEL(sel))
if (sel != 0 && !VALID_USER_DSEL(sel))
if (!VALID_USER_DSEL(sel))
if (!VALID_USER_DSEL(sel))