You received just the Dotmation I/O board I take it? You already have the Dotmation screen and power supply? Assuming you have all three things, the only thing that could possibly display on the Dotmation would be the generic Williams logo upon startup, but I don't know if even that needs at least the system EPROM to display it.
The I/O board itself is rather bullet-proof. Screen (rugged if handled well, just wears out/gasses out over time, nearly unobtainium today...) and power supply are the real trouble components. I imagine you're putting together a Dotmation themed game, so why not just get the remaining EPROMs you need (should be pretty easy to get your hands on those) and put it all together?