Do a search, this has been discussed here. AJA says you can't have anything else on the FW bus when the IO
is being used because it uses all the FW bandwidth. The FW400 and 800 ports share the same single bus, so
having 2 ports doesn't mean 2 busses. If you have a camera or deck connected you may have problems.
But if you search the posts you'll find that some people are using it with other devices attached without