Int 21 Fn 1E  - Dos 1+ - Null Function For Cp/m Compatibility              [D]

   AH = 1Eh

Return: AL = 00h

Note:  corresponds to the CP/M BDOS function "set file attributes" which was
    meaningless under MS-DOS 1.x

See Also: AH=18h,AH=1Dh,AH=20h