void setup()
{
  volatile long i,j;
  unsigned char switches;
  char arr[4]={64,32,8,4};
  volatile char *dirf,*outf;
  volatile char *dirk,*ink;
  dirf=0x30; outf=0x31;
  dirk=0x108; ink=0x106;
  *dirf=0xFF; *dirk=0x00;
  while(1)
  {
    switches=*ink;
    if((switches & 0x04) == 0x04)
    {
      for(i=0;i<=3;i++)
      {
        *outf=arr[i];
        for(j=1;j<=1000000;j++);
      }
    }
    else*outf=0x00;
  }
}

void loop()
{

}