The Atari joystick Pinout Common Ground. - Atari 8-Bit Computers - AtariAge Forums
BYO Atari 7800 Controller - Schematic for dummys - Atari 7800 - AtariAge Forums
9pin Joystick Controller Cable for Atari 2600 Commodore C64 Vic-20 Ami – RetroArcadeCrafts
C-64 Workshop / Pin Connections
Atari joystick port - Wikipedia
Joystick information and circuits
msarnoff.org - USB Adapter for Sega Genesis Controller
General Purpose port - MSX Wiki
Reading the Sega Mega Drive / Genesis control pads | PICAXE Forum
15/9 pin controller converter
Retro 9 Pin Joystick to USB Converter : 4 Steps (with Pictures) - Instructables
SegaMaster System (SMS) and MegaDrive joystick pinout diagram @ pinoutguide.com
Atari-style joystick to PC joystick adapter pinout and wiring @ old.pinouts .ru
commodore 64 - Would a multi button controller have been possible on the C64? - Retrocomputing Stack Exchange
File:Atari joy-port.svg - Wikimedia Commons
Radio Shack Avenger 700 Joystick - 2 row 15 pin connector - Project Guidance - Arduino Forum
PC Joystick Pinout – rahji.com
Atari ST
D SUB9 <> DIN Joystickadapter for VP/O2
Joystick interface for C-16, C-116 and Plus/4 - V1.1
DB9/DIN6/DB15 joystick pinouts - Classic Computing Discussion - AtariAge Forums
Atari-style joystick to PC joystick adapter · AllPinouts
D SUB9 <> DIN Joystickadapter for VP/O2
Reviving an old joystick with an Arduino Leonardo | It's Every Bit For Itself
