Atari joystick port - Wikipedia
Making a Joystick for C64 or Atari | Kosciusko Media
Joystick interface for C-16, C-116 and Plus/4 - V1.1
9pin Joystick Controller Cable for Atari 2600 Commodore C64 Vic-20 Ami – RetroArcadeCrafts
Making a Joystick for C64 or Atari | Kosciusko Media
commodore 64 - Would a multi button controller have been possible on the C64? - Retrocomputing Stack Exchange
Retro Joystick CPC Adapter
Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9 – pagetable.com
4 joystick adapter for C64/128 (CGA/Protovision)
ESD Protection for the C64 Control Ports | hackup.net
C64 DB9 compatibility | Official Pyra and Pandora Site
Tube Time 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 neither
Connectors Commodore 64 – My old computer
DIY) USER PORT DONGLE for C64 586220 DIAGNOSTIC CARTRIDGE - Share Project - PCBWay
Connectors Commodore 64 – My old computer
Ultimate fix for the C64 Mini Joystick - Use any Atari or C64 Original joystick! - YouTube
Joystick information and circuits
C64 DB9 compatibility | Official Pyra and Pandora Site
Reading C64 Joysticks and Analog Signals (Programming Electronics with the Commodore 64 Part 3) - Retro Game Coders
What is the pin-out on the 6M DB9 port? – COBRA Firing Systems
Arduino Project: Commodore 64/Amiga, Atari 2600/XL/ST, ZX Spectrum Joystick to Windows/Linux (RetroPie) USB | jfrmilner's Tech Blog
