Hi,
"Had"?
If you still got it (or access to it), couldn't you open it and see what's inside?
How many wires does it use and how many switches has it got (besides the obvious four; forward, back, left and right)?
What other components are inside?
Could you post (sharp) close up photos of the innards?
Feel free to post whatever results you allready got, however inconclusive they may seem.