I have one of those 6100's, it says DOS Compatible where the normal 6100's say PowerPC (I have a normal 6100 as well).
The DOS card runs decently, I have all the cables needed for it (you also need the funky nubus PPC video to mac video adapter).
The DOS card runs decently, I have all the cables needed for it (you also need the funky nubus PPC video to mac video adapter).