It looks like your unit is the original first version, labeled "H8000". Then the H8000A followed (with 4 analog I/Os) and finally the H8000FW with 4 analog I/O, FireWire and 8 AES-EBU channels on a DB-25 connector.
So, your unit can be only used as a stereo machine thru analog I/Os. Any other reset must be used thru AES or ADAT…
….or you can upgrade it to H8000FW! The Eventide website has information on the costs and details.
all the best
I
