static READ32_HANDLER( port1_r )
{
      UINT16 viewval = readinputport(1); //actual value stored in memory
      UINT16 viewdiff = viewval ^ last_port1;
      if ((viewdiff & 0x0010) && !(viewval & 0x0010)) //the button is pressed (?)
      {
            if (view_state==0) {view_state = 4;} //1st view
            else if (view_state==4) {view_state = 2;} //2nd view
            else if (view_state==2) {view_state = 1;} //3rd view
            else if (view_state==1) {view_state = 4;} //1st view
      }
        last_port1 = viewval; 
        viewval = (viewval | 0x00f0) ^ (view_state << 4);
        return (viewval << 16) | viewval;
}