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  Routine:      CBL_WRITE_SCR_TTY
 
  Function:     Writes a string of characters to the screen starting
                at the current position and scrolling.
 
  Syntax:       CALL "CBL_WRITE_SCR_TTY" USING     character-buffer
                                                   string-length
                                         RETURNING status-code
 
  Parameters:   character-buffer       PIC X(n).
                string-length          PIC X(2) COMP-X.
                status-code            See ◄Key►
                                    -♦-