INT 21,27 - Random Block Read Using FCB

AH = 27h

CX = number of records to read

DS:DX = pointer to an opened ~FCB~

on return:

AL = 00 if read was successful

= 01 if EOF (no data read)

= 02 if ~DTA~ is too small

= 03 if EOF (partial record read)

CX = actual number of records read

- allows random access and sequential reading of a group

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

- FCB must be setup with drive id, filename, extension

record length and random record number before call