DOS Fn 14H: Read Sequential File via FCB

                                                         Compatibility: 1.0+ 
 Expects: AH    14H
          DS:DX address of an opened FCB
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 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)
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    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)
          FCB File I/O
          Handle-Oriented File I/O
          DOS Functions
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