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  Function 02H (decimal 2) copies a single ASCII character from register DL
  to the standard output device. In DOS version 1, the standard output
  device is always the video screen; in later DOS versions, output can also
  be redirected to a file.

  In general, this function treats the ASCII control characters, such as
  backspace or carriage return, as commands. In the case of the backspace
  character, the display screen cursor is moved backward one column without
  erasing the previous character.