All record formats, fixed (F), variable (V), and undefined (U), are supported under TSO/E. Before passing the data to the problem program, TSO/E automatically generates the first four bytes of control information for V format records coming in from the terminal. When you send V format records to the terminal, TSO/E automatically removes the control information before writing the line.

Control characters (ANSI or machine) are not supported under TSO/E. On output, they are removed before the data is sent to the terminal. On input, they are ignored.

Table reference characters with OPTCD=J are treated as part of the data, and the access method does not remove them.

Both simple and exchange buffering techniques are supported, as are all four processing modes for the queued access method.