code: def push_byte(self, stack_pointer, byte):
          
          # FIXME: self.system_stack_pointer -= 1
          stack_pointer.decrement(1)
          addr = stack_pointer.value
  
  #        log.info(
  #         log.error(
  #            "%x|\tpush $%x to %s stack at $%x\t|%s",
  #            self.last_op_address, byte, stack_pointer.name, addr,
  #            self.cfg.mem_info.get_shortest(self.last_op_address)
  #        )
          self.memory.write_byte(addr, byte)
docs: pushed a byte onto stack