void setup() {
 volatile char *portf, *portk;
 portf = 0x30; portk = 0x107;
 *portf = 0xFF; *portk = 0x00;

}

void loop() {
  volatile char *outf, *ink;
  outf = 0x31; ink = 0x106;
  char hex[] = { 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F };
  switch(*ink){
    case 0x01:
    *outf = hex[8];
    break;
    case 0x02:
    *outf = hex[7];
    break;
    case 0x04:
    *outf = hex[6];
    break;
    case 0x08:
    *outf = hex[5];
    break;
    case 0x10:
    *outf = hex[4];
    break;
    case 0x20:
    *outf = hex[3];
    break;
    case 0x40:
    *outf = hex[2];
    break;
    case 0x80:
    *outf = hex[1];
    break;
    default:
    *outf = 0;
    break;
  }

}