volatile unsigned char *porta,*portk;

void setup() {
  // put your setup code here, to run once:
  volatile unsigned char *dira,*dirk;
  dira = 0x21;
  *dira = 0xFF;
  dirk = 0x107;
  *dirk = 0x0F;
  porta = 0x22;
  portk = 0x108;
}

void loop() {
  // put your main code here, to run repeatedly:
  *portk = 0x0E;
  *porta = 0x3F;
  *portk = 0x0D;
  *porta = 0x06;
  *portk = 0x0B;
  *porta = 0x5B;
  *portk = 0x07;
  *porta = 0x4F;
}