If i need a double digit display (eg:54) can anyone explain why we are connecting the ~RBO of preceeding digit to the next digit's ~RBI. Please explain the internal mechanism ( I know that its for supressing trailing zeroes ). And also i have done the simulation and when im trying to run it the preceeding digit is not displaying (eg: in 37 only 7 is being displayed the other 7 segment display doesn't work ) why is this happening ?