Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 2Fh
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  Interrupt:   21h     Function:   2Fh
 
  Title:       Get DTA Address
 
  See also:    Set DTA Address, @GetDTA
 
  Description:
 
     Obtains the current address of the disk transfer area (DTA) for
     FCB read/write operations. The disk transfer area address is set
     with Int 21h Function 1Ah. The default DTA is a 128-byte buffer at
     offset 80h in the program segment prefix.
 
     Input        Output
 
     AH = 2Fh     ES:BX = segment:offset of disk
                          transfer area
                                    -♦-