How to build an Amiga Joystick to USB adapter (DB9 to USB) - Retro32
Atari joystick port - Wikipedia
C-64 Workshop / Pin Connections
Technical corner
Build your own Commodore 64 arcade stick - a guide - Retro Games Collector
Commodore Info Page - Articles: C64 - DTV2 with IEC, keyboard and joysticks [en]
Joystick with 2 button support - English Amiga Board
The Keypad Joypad - Amiga, Atari, C64... | Hackaday.io
Does anyone use old 9 pin joysticks like this with a computer cores on the MiSTer? A friend wants to use this with the Amiga or ST emulators. : r/fpgagaming
Joystick interface for C-16, C-116 and Plus/4 - V1.1
File:Amiga Powerstick with 9-Pin connector and 1,5m cable.jpg - Wikimedia Commons
3D-Printing a Joystick and a Paddle Controller (While Waiting on my C64 Parts)—Sven Krasser's Blog