n D-Sub M J Port C A 1200 M PCB DB9 12674 US $1.25 unalinguistica.com.br
Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9 – pagetable.com
Joystick information and circuits
Joystick interface for C-16, C-116 and Plus/4 - V1.1
Connectors Commodore 16 – My old computer
commodore 64 - Would a multi button controller have been possible on the C64? - Retrocomputing Stack Exchange
Connectors Commodore 64 – My old computer
$3.00 Goodwill find: Removed all electronics from an old PC gamepad and rewired it for use with Commodore computers. : r/c64
Retro Isle - C64/128 Technical Section
PSCD32 Development Diary
9pin Joystick Controller Cable for Atari 2600 Commodore C64 Vic-20 Ami – RetroArcadeCrafts
Joystick with 2 button support - English Amiga Board
Atari joystick port - Wikipedia
Connectors Commodore 64 – My old computer
Vectrex Controller to Atari 2600 Adapter - CNK
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