INT 21,28 - Random Block Write Using FCB

AH = 28h

CX = number of records to write

DS:DX = pointer to an opened ~FCB~

on return:

AL = 00 if write successful

= 01 if diskette full or read only

= 02 if ~DTA~ is too small

CX = number of records written

- allows random access and sequential writing of a group

of records from a file opened with an FCB into the DTA

- FCB must be setup with random record number and record size

- updates random record number, current block and current

record fields