Build your own Commodore 64 arcade stick - a guide - Retro Games Collector
Atari joystick port - Wikipedia
Build your own Commodore 64 arcade stick - a guide - Retro Games Collector
Joystick Controller for Commodore - Commodore 64 Brain
Joystick information and circuits
Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9 – pagetable.com
Tube Time (@tubetime@mastodon.social) on Twitter: "the left one is a Commodore 1351 mouse designed for a C64/C128, while the right one is meant for an Amiga. the pinouts are very close and
Commodore Info Page - Articles: C64 - DTV2 with IEC, keyboard and joysticks [en]
C-64 Workshop / Pin Connections
The Keypad Joypad - Amiga, Atari, C64... | Hackaday.io
Connectors Commodore 64 – My old computer
Commodore Info Page - Articles: Input devices [en]
Technical corner
Joystick - DenialWIKI
Control Port - C64-Wiki
Joystick interface for C-16, C-116 and Plus/4 - V1.1
Obsolescence Guaranteed: Converting the 'Commodore 64' DTV
Reading C64 Joysticks and Analog Signals (Programming Electronics with the Commodore 64 Part 3) - Retro Game Coders