Only? Apart from
"Plug in dusty old cartridges, CRT TVs, datasettes, or disk drives - it all works" and "128MB DDR2 RAM (16 MB system, 16 MB REU, 16 MB GeoRAM (soon), remaining MB RAM Disk)" where I assume the RAM disk fits into the "Wi-Fi game transfer" as a destination but that is just a guess from my side.
Or usb.

in my head. I had a mental lapse thinking it might have sata support which is a fever dream of epic fail.
I think fujinet is still a work in progress.
Regardless. This is going to make so many happy. I hold out for rm800xl but that appears to be a true science fiction fantasy