Compatibility: 1.0+
Expects: AH    14H
DS:DX address of an opened FCB
Returns: AL    0 if the read was successful and the DTA contains data
1 if EOF was reached and no data was read
2 if DTA+ FCB recSiz would overrun a segment (no read)
3 if EOF and a partial record was read (padded with 0s)
Info: Reads recSize bytes from the file address specified by curBlk and
curRec (as specified in the FCB) into the DTA.  Then increments
the block-and-record file address.

Be sure to set curRec to 0 before starting sequential file
operations, since Fn 0fH Open FCB does not initialize it.

See Also: Fn 1aH (set DTA)
Fn 3fh (read from handle)
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DOS Fn 14H: Read Sequential File via FCB