Retro Atari 7800 Mod: Sega Master System Controller to Atari 2600/7800 Hack : 4 Steps - Instructables
Atari 7800 2600 Robotron RobotWar Themed Controller Control Pad Gamepa – RetroGameBoyz
Two Dual Red Button Joystick Controllers for Atari 2600, Atari 7800, Retron 77 and Atari Flashback Systems - Walmart.com
racketboy.com • View topic - Portable PlugPlay - Atari 7800 Video Cart Slot Mod Audio Fix
Atari 7800 Joystick Controller (Atari 7800) | Classic Game Room Wiki | Fandom
Atari 2600 und 7800 Zubehör - atarimuseum.de
After 14+ months work
Amazon.com: Retro Classic 3D Analog Joystick Controller for Atari 2600 Joystick, for Atari Flashback Game Control with Operating Button/Four-Way Joystick, for Atari Joystick with Games for Atari 2600 Systems : Video Games