code: def instruction_RTS(self, opcode):
          
          ea = self.pull_word(self.system_stack_pointer)
  #        log.info("%x|\tRTS to $%x \t| %s" % (
  #            self.last_op_address,
  #            ea,
  #            self.cfg.mem_info.get_shortest(ea)
  #        ))
          self.program_counter.set(ea)
docs: Program control is returned from the subroutine to the calling program.
          The return address is pulled from the stack.
  
          source code forms: RTS
  
          CC bits "HNZVC": -----