The NiCad battery pack in the controller is dead. We just purchased an old SC3000 that uses ADS (Replaced by Buzz) running in DOS. After replacing the battery pack you have to home the robot. You may be able to do this in Buzz. I found a Buzz 2 manual at Buzz2UsersManual_°Ù¶ÈÎÄ¿â. I can't figure out how to download it as some of the website is in Chinese or Mandarin.