INT 21,1A - Set Disk Transfer Address (DTA)

AH = 1A

DS:DX = pointer to disk transfer address (~DTA~)

returns nothing

- specifies the disk transfer address to DOS

- DTA cannot overlap 64K segment boundary

- offset 80h in the ~PSP~ is a 128 byte default DTA supplied

by DOS upon program load

- use of the DTA provided by DOS will result in the loss

of the program command tail which also occupies the 128

bytes starting at offset 80h of the PSP

- see ~INT 21,2F~