Game Controller Pinouts

I'm make this post as much for my own reference. All three uses DB9-pin connectors

Pinouts for the Odyssey2 controller
1 - Ground
2 - Fire
3 - Left
4 - Down
5 - Right
6 - Up
7,8,9 - not connected

Pinouts for the Atari 2600 controller
1 - Up
2 - Down
3 - Left
4 - Right
6 - Fire
8 - Ground
5,7,9 - not used

Pinout for Sega Genesis controller
1 - Up
2 - Down
3 - Left
4 - Right
5 - Voltage
6 - Button A/Button B
7 - Select
8 - Ground
9 - Button Start/Button C