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;      
        delay(200);    
        *out = 0x04;      
        delay(200);   
        *out = 0x02;      
        delay(200);     
        *out = 0x08;      
        delay(200);   
        *out = 0x10;      
        delay(200);   
        *out = 0x40;      
        delay(200);   
        *out = 0x20;      
        delay(200);   
        *out = 0x80;      
        delay(200);      
    }
}