This is the famouse Cumana controller. It's unique, because the controller has external buffered Oric expansion port mirrored. I don't know if someone has had used it, but I will try. I was the happiest human in the world when I saw working Cumana controllers. I built them from old stock boards I have owned. It was not so easy to be done. Thanks to my friend who gave me an original Cumana controller I was able to check everything, to compare every single component and succesfully to run the new boards.