Note: The following information comes from a Usenet message posted to the group rec.games.video.classic in August of 1995. You can see the original post on Google Groups.

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Subject: Re: Where are the O^2 pinouts?
From: Bruce Tomlin

Here's what I have in my archives:

From: Ben Lincoln
Subject: O2 Joystick patch Date: 6 Aug 1995 19:39:06 GMT

Okay... I've been meaning to post this for awhile, but I couldn't find my notes on the pinouts for the two systems involved. Anyway, here is how to modify an Odyssey^2 system to use Atari 9-pin joysticks.

First, a note: This research was done on a later-model O2--It has a standard RF cable, and the Odyssey2 logo is on a raised plate rather than simply stenciled on the unit.

Materials needed:

1. A Hex driver (Size unknown). A rachet set might work as well.
2. 2 Atari 9-pin style joystick ports.
3. Some solder and an iron, OR electrician's tape for the quick version.

The procedure:

1. Open the O2 case, and remove the bottom half.
2. Chop off the joystick cables about 1 to 1-1/2 feet from the connector on the motherboard.
3. Looking at the connector on the motherboard, the following wires should be exposed just before they enter the cable cover:
   • (Left to Right)
   • Red
   • Orange
   • Yellow
   • Green
   • Black
   • White
4. Strip the ends of the whacked-off joystick cable to the bare wire, and splice them into the Atari ports as follows:

   

   (Front view--These are the pins the joystick will connect to. They are pointing towards you).

   Function	Odyssey 2	Connects to Atari Pin #
   Joystick Up	Red	5
   Joystick Down	Yellow	4
   Joystick Left	Green	3
   Joystick Right	Orange	2
   Action/Fire	White	9
   Ground	Black	7

5. Mount the ports anywhere you want. I'm thinking of doing mine 7800-style, on the front of the O2.

I've only tried this on mine, so any corrections are greatly appreciated.

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Ben Lincoln     +/\s