INT 21,2F - Get Disk Transfer Address (DTA)

AH = 2F

on return:

ES:BX = pointer to current ~DTA~

- returns the DTA address

- the default DTA is a 128 byte block at address 80h in the

Program Segment Prefix (~PSP~). This area also contains the

command tail at program startup it must be saved or the DTA

must be relocated before use to preserve the command tail

- see ~INT 21,1A~