Oh and I should have made the obvious point before about why I was saying ADAT stand-alone made the Fireface 800 interesting...
I don't think this old series of interfaces is getting driver support on Apple silicon, you can check with RME to be sure. But if so may not be a good choice as an interface (depends on your Mac plans), maybe a great choice as a cheap ADAT mic-pre... especially is prices fall more as folks dump them as Mac interfaces. I'll buy some if the price craters enough