Hello everyone!
By the online mode of Capcom games, a file called NET was often mentioned. This file was required to successfully connect to the KDDI system. Capcom has taken this pattern further with the Playstation 2, the "resurrected" online Playstation 2 games (for example the japanese version of Monster Hunter) also requiring this file to be present. I suppose the proper content of this file is also a missing piece to revive the network mode for the fighting games on our beloved Dreamcast.
I found this guy on Reddit:
https://www.reddit.com/r/dreamcast/comm ... xperiment/
He mentioned the "tweaking of the sp net capcom file". I already wrote him on reddit.
I hope he shares his findings with us.