Thumper has been around for many years, it is what is called a floor turtle. It has a hole down through the middle to hold a felt pen for doing turtle graphics. It started out tethered to an Atari 400, but now it has an on board microcontroller.
The computer is a Motorola 68hc11 e1 with 512 bytes RAM, and 512 bytes EEPROM, on a BotBoard. Driven by two large stepper motors. It has no sensors, all it knows is what it sends to the motors.
Thumper's EEPROM contains turtle graphics routines; forward, backward, right turn, left turn, and pause. This allows simple turtle programs to be loaded and run from RAM. The EEPROM also includes a program for the dead reckoning contest, and the robot art contest, that used to be held by the Seattle Robotics Society.