Mine

void setup(){  // start serial port at 9600 bps:  Serial.begin(9600);  Serial.write(0xAA);}void loop(){  int inByte;  int outByte = 64 | 5;  while (1) {    if (Serial.available() > 0) {      // get incoming byte:      inByte = Serial.read();      if (inByte == 0xFF) {        Serial.write(outByte);      }      else {         Serial.write('b');       }    }  }}