NUMBER:  256

  ERROR CODE:  F

  MESSAGE TEXT:  unformatted I/O to unit open for formatted transfers

  EXPLANATION:  Attempted unformatted I/O to a unit where the OPEN
  statement indicated the file was formatted (FORM specifier).  Check
  that the correct unit (file) was specified.

  If FORM was not specified in the OPEN statement and the file should
  contain unformatted data, specify FORM='UNFORMATTED' in the OPEN
  statement.  Otherwise, if appropriate, use formatted I/O (such as
  list-directed or namelist I/O).