INT 21,15 - Sequential Write Using FCB

AH = 15h

DS:DX = pointer to an opened ~FCB~

on return:

AL = 00 if write was successful

= 01 if diskette is full or read only

= 02 if ~DTA~ is too small

- writes a record from the DTA to the current record position

in file specified by the opened FCB

- record size and output location are maintained in the FCB