I will have to fire up the Beaver Mill today and see but I was sure I just put something like port 5 and pins 1, 2 etc. I have a recollection that the SS maybe said they were not valid but had a box you could check to say to ignore in future, maybe that has been removed from recent versions, my plugin is probably 8 or more years old, or maybe I am just not remembering correctly, haven't used the Beaver Mill for about 5 or so years.