Can someone tell me if the 104e board is an actual reverse unit? It looks like it is actually part of another board. I have a steam engine with a dc can motor that I want to add a reverse unit too with very limited room. I would like to have reverse and possibly a whistle sound. The 104e board looks like it would fit, but I can't find any literature on it, let alone a pin-out for the connections.
Anyone familiar with this board? The size and the cost are right.