#define Delay 90000
void setup() {
  // put your setup code here, to run once:
  volatile unsigned char *r=0x107;
  *r=0xFF;
}

void loop() {
  // put your main code here, to run repeatedly:
volatile unsigned char *row=0x108;
*row=0xF0;
volatile long i;
for(i=0;i<Delay;i++);
}