Ultimate fix for the C64 Mini Joystick - Use any Atari or C64 Original joystick! - YouTube
DIY) USER PORT DONGLE for C64 586220 DIAGNOSTIC CARTRIDGE - Share Project - PCBWay
Joystick interface for C-16, C-116 and Plus/4 - V1.1
Arduino Project: Commodore 64/Amiga, Atari 2600/XL/ST, ZX Spectrum Joystick to Windows/Linux (RetroPie) USB | jfrmilner's Tech Blog
Connectors Commodore 16 – My old computer
Control Port - C64-Wiki
C-64 Workshop / Pin Connections
Technical corner
Reading C64 Joysticks and Analog Signals (Programming Electronics with the Commodore 64 Part 3) - Retro Game Coders
Joystick interface for C-16, C-116 and Plus/4 - V1.1
Atari joystick port - Wikipedia
Reading C64 Joysticks and Analog Signals (Programming Electronics with the Commodore 64 Part 3) - Retro Game Coders
$3.00 Goodwill find: Removed all electronics from an old PC gamepad and rewired it for use with Commodore computers. : r/c64
Connectors Commodore 64 – My old computer
What is the pin-out on the 6M DB9 port? – COBRA Firing Systems
ESD Protection for the C64 Control Ports | hackup.net
Problems Connecting an Arduino Uno to a Commodore 64 Joystick Port - Retrocomputing Stack Exchange
Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9 – pagetable.com
9 Pin Joystick to USB Adapter
The Keypad Joypad - Amiga, Atari, C64... | Hackaday.io
Connectors Commodore VIC 20 – My old computer
Connectors Commodore 64 – My old computer
General Purpose port - MSX Wiki
C64 DB9 compatibility | Official Pyra and Pandora Site
Retro Isle - C64/128 Technical Section
