void setup()
{
  volatile long i,j;
  unsigned char switches;
  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 & 0xC9) == 0xC9)
    {
      *outf=128;
      for(i=1;i<=4000000;i++);
    }
    else*outf=0x00;
  }
}

void loop()
{

}