The Arcade' joystick with DB9 connector for playing on an MSX emulator
USB DB9 Joystick adapter
Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9 – pagetable.com
Atari/SMS/Genesis joystick/controller/multi-tap to USB adapter
What's the best DB9 (Atari 2600, 7800, ColecoVision, Sega Master System, Genesis, Odyssey2, C64, etc.) original controller to USB adapter in 2021? : r/RetroPie
9 pin to USB Dual Atari Joystick, Paddle, and Driving Adapter by iCode, DB9 ports, Pro 2
Use a retro DB9 joystick with Raspberry Pi 400 — The MagPi magazine
Amiga Joystick / Amiga Mouse Extension Cable DB9, Amiga Kit Amiga Store - the world's largest Amiga Store - we ship worldwide
Another DB9 Joystick for the collection. : r/retrogaming