void setup() {
  volatile char *ddra;
  ddra = 0x21;
  *ddra = 0xff;
  volatile char *ddrb;
  ddrb = 0x24;
  *ddrb= 0xff;
}

void loop() {
  // put your main code here, to run repeatedly: 
  volatile char *outa = (char*)0x22;
  *outa= 0x6d;
  volatile char *outb = (char*)0x25;
  *outb=0x5b;
}