One member asked how I was able to use Megadrive controllers with my +2.
It's very simple actually, you'll need a couple of 9 pin sockets, and some wire or ribbon cable.
Simply remove the motherboard from the system, flip it over and solder the wires to the underside. Route them to wherever your sockets are, and connect them up according to the wiring diagram below.
It's as simple as that.
Obviously, if you're using the Atari sockets, you will be unable to use the SJS sockets simultaneously.
Being able to use the entire range of Atari standard controllers makes a big difference!