Int 13 Fn 1C0F  U - Esdi Fixed Disk - ???                                  [d]

   AX = 1C0Fh
   DL = drive (80h,81h)
   ???

Return: ???

Note:  invokes controller command 0614h without DMA

See Also: AH=1Ch"ESDI",AX=1C0Dh,AX=1C12h,PORT 3510h"ESDI"