Atari Controller Interfaces
Stelladaptor
Stelladaptor is a USB interface specifically for Atari 2600 joysticks, paddles, and trackballs.
Keyboard Encoders
Joysticks for Atari 2600 and Atari 7800 consoles (and compatible systems like: Atari 400/800/ST computers, Commodore C64, Sega Master System, Sega Genesis/Megadrive/32X, and others) are fairly easy to interface with Keyboard Encoders. The joystick cords end in standard D-sub 9 female connectors. Each of the 9 pins corresponds to one directional, fire, or common signal.
D-sub 9 pin male connector pinout diagram
D-sub 9 pin male connector photo
D-sub 9 female connector pinout diagram
Here are the pin-outs:
| 1 = Up | 2 = Down | 3 = Left | 4 = Right | 5 = empty |
| 6 = Fire Button | 7 = empty | 8 = Common (Ground) | 9 = empty |
| 1 = Up | 2 = Down | 3 = Left | 4 = Right | 5 = Right Button |
| 6 = Both Buttons | 7 = empty | 8 = Common (Ground) | 9 = Left Button |
So when you move your joystick up, it closes a circuit between pin 1 and pin 8.
To connect a keyboard encoder (I-PAC, KeyWiz, etc.), you need to wire a male D-sub 9 pin connector (available at any electronic parts store) to the appropriate keystrokes on the encoder.
It is as simple as that for the 2600. Just connect the fire button (pin 6) to player1 (or whichever player) button1, left to p1 left, right to p1 right, common to ground, etc.
If you wish to use the 7800 joystick and take advantage of both buttons, you can choose which pin (usually 5) to connect to button1 (bridged with pin 6) and which to button2, or you can bridge pins 5, 6, and 9 so that any button you push on any Atari 2600 or 7800 joystick will close the button1 circuit.
Note that Atari console paddles and trackballs will not work with this method, but could possibly be connected to Gamepad Encoders or Optical Encoders.
Conversely, if you would like to use an arcade joystick with your original Atari console, wire your joystick and buttons to a female D-sub 9 on the end of a cable, and it will plug right into your console.
