Problems Connecting an Arduino Uno to a Commodore 64 Joystick Port - Retrocomputing Stack Exchange
Technical corner
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
ESD Protection for the C64 Control Ports | hackup.net
TUT] Mega Drive Pad am AMIGA / C64 mit Buttonremapping - Commodore - Circuit-Board
Joystick interface for C-16, C-116 and Plus/4 - V1.1
Joystick information and circuits
Atari joystick port - Wikipedia
Technical corner
Joystick with 2 button support - English Amiga Board