For those who don’t know, click here: https://dreamcastlive.net/dreampi-tutorial/
This is how I connected for PSO.
I’ve mostly hunted on Ragol years ago when lately I decided to start over to avoid playing the Ultimate difficulty at level 74 to 75.
Click here to see any games online now: https://dreamcastlive.net/games/
I also appeared on the DreamcasticChannel a couple of times myself years ago on YouTube:
Back in the day (before third party hardware to do this) the only way to get Dreamcast online was to Dialup or the very rare and expensive broadband adapter.
Seeing as the Dreamcast shipped with a dial up modem, it was possble to set up your PC (also with a modem) and with a a couple of resistors, make a type of "dial up crossover cable". You would set up your PC to "answer" the call from the Dreamcast, then route the traffic to the PCs broadband connection. Zero phone line needed!
That's how it's done here as well. A USB modem attached to a raspberry pi (or just any pc) which answers the dial up connection from the Dreamcast, routing it through broadband.