code: def instruction_BSR_JSR(self, opcode, ea):
          
  #        log.info("%x|\tJSR/BSR to $%x \t| %s" % (
  #            self.last_op_address,
  #            ea, self.cfg.mem_info.get_shortest(ea)
  #        ))
          self.push_word(self.system_stack_pointer, self.program_counter.value)
          self.program_counter.set(ea)
docs: Program control is transferred to the effective address after storing
          the return address on the hardware stack.
  
          A return from subroutine (RTS) instruction is used to reverse this
          process and must be the last instruction executed in a subroutine.
  
          source code forms: BSR dd; LBSR DDDD; JSR EA
  
          CC bits "HNZVC": -----