Int 2F Fn 1217  U - DOS 3+ Internal - Get Current Directory Structure For  [D]

   AX = 1217h
   SS = DOS DS (must be using a DOS internal stack)
   STACK: WORD drive (0 = A:, 1 = B:, etc)

Return: CF set on error
       (drive > LASTDRIVE)
   CF clear if successful
       DS:SI -> current directory structure for specified drive
   STACK unchanged

See Also: AX=1219h