Seagull 78 Controller Adapter
Gamepad Gameplay for the Atari 7800!
The Seagull 78 is a controller adapter that allows the use of any Sega Genesis gamepad or other Genesis controller with your Atari 7800, providing authentic two-button gameplay control on all Atari 7800 games.
Plug your Sega Genesis or compatible controller into the Seagull 78, then plug the 28" (0.7m) factory molded game cord into your Atari 7800 console. Buttons "B" and "C" on your Sega controller provide authentic two-button gameplay control on all Atari 7800 games. No other buttons are utilized on the controller while using the Seagull 78 adapter.
Note: This product is an adapter only! You must provide the Sega Genesis compatible controller!
Note: The Seagull 78 controller adapter is not compatible with Sega Master System controllers.
Here's a review by the No Swear Gamer: