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A terminal is a real or emulated device that is used for accepting data and commands from the user and displaying data sent by the system to the user on screen. Terminal names in OpenVMS usually start with T (TNA, TTA etc.); OPx stands for operator terminal.

Operator terminal

One of the terminals connected to an OpenVMS system (OPA0 by default) is used by the system to display OPCOM messages. A terminal can be enabled as an operator terminal with REPLY/ENABLE and disabled with REPLY/DISABLE.

Terminal Settings

Terminal settings can be viewed with SHOW TERMINAL and altered with SET TERMINAL. They include:

  • advanced video
  • alternate type-ahead buffer
  • keypad mode: numeric or application
  • baud rate
  • block mode transmission, local editing, and field protection support
  • reception of broadcast messages
  • support for color escape sequences
  • connection of asynchronous printers
  • generaton of null characters after each carriage return to ensure that the terminal is ready for reception etc.