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  Routine:      CBL_CLEAR_SCR
 
  Function:     Clears the whole screen to a specified character
                and attribute.
 
  Syntax:       CALL "CBL_CLEAR_SCR"   USING     character
                                                 attribute
                                       RETURNING status-code
 
  Parameters:   character              PIC X.
                attribute              PIC X.
                status-code            See ◄Key►
                                    -♦-