INT 21 - DOS 1+ - SET DISK TRANSFER AREA ADDRESS
AH = 1Ah
DS:DX -> Disk Transfer Area (DTA)
Notes:  the DTA is set to PSP:0080h when a program is started
under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
SeeAlso: AH=12h,AH=2Fh,AH=4Eh,AH=4Fh

See also: 2111

211A - DOS 1+ - SET DISK TRANSFER AREA ADDRESS