Library for RAM chip

Using Arduino Storage
20 
int AM9111::_read()
{
  digitalWrite(_odp,0);
  digitalWrite(_wep,1); 
  int rv = 0;
  bitWrite(_rbits,0,digitalRead(_IO[0]));
  bitWrite(_rbits,1,digitalRead(_IO[1]));
  bitWrite(_rbits,2,digitalRead(_IO[2]));
  bitWrite(_rbits,3,digitalRead(_IO[3]));
  _read() = _rbits;
  return rv;
}

Have you ever thought why this routine would always return zero? (if it were to compile)
Is that what you want?