void setup()
{
    volatile unsigned char *dir;

    dir = (volatile unsigned char *)0x30; 
    *dir = 0xFF;                           
}

void loop()
{
    volatile unsigned char *out;

    out = (volatile unsigned char *)0x31;  

                          

    while(1)
    {
      *out |= 0X01;
      *out |= 0X10;
      delay(1000);
      *out |= 0X02;
      *out |= 0X20;
      delay(1000);
      *out |= 0X04;
      *out |= 0X40;
      delay(1000);
      *out |= 0X08;
      *out |= 0X80;
      delay(1000);
    }                             
}