AA member Orange808 has created a new title for the Atari 2600 based on the Tron arcade game that goes by that title. The game uses DPC+ and looks pretty amazing. It uses two controllers to be able to emulate the gameplay from the arcade machine.
Port 1: Mattell "M Network" Tron controller
Port 2: CX-22 Trackball in joystick mode. (Not analog)
For some reason, the binaries were removed from the thread, so the latest version is not available. I'll try contacting the programmer to see if I can learn what happened.