The GC didn't ship with a modem at all even in early not cost reduced models. There may have been some bundles with a modem for PSO1&2 or Homeland but there was only 4 games in its entire library that could even go online.
The Dreamcast had a built in modem and some models of PS2 had one built in.
> The GC didn't ship with a modem at all even in early not cost reduced models.
Yeah that's what I meant (GC and DC too similar acronyms -- easy to typo). I did say elsewhere that the GC's online capabilities required an addon whereas the DC shipped with one).
That said, there were a few special edition Dreamcasts that shipped with the ethernet adapter instead of a modem. They weren't common but they did exist.
I've got a GC and DC sat next to me too -- unfortunately neither with an ethernet adapter. I do have a DreamPi hooked up on the DC though.
> there was only 4 games in its entire library that could even go online.
5 actually, though the 5th only went online for DLC. That said, you can argue that it's a bit of a stretch to call PSO and PSO+ different games.
It's also worth noting that there were a few other GC games that supported the ethernet addapter too albeit for LAN play rather than online. This was in addition to those games also supporting crossover cable.
> and some models of PS2 had one built in.
The original models didn't have it. It was only the slimline models that had ethernet and they were released quite late in the life of the PS2. The previous models required a hardware expansion adapter to provide online functionality (like the GC). Sony were pretty late to the game in that regard because Sega and Microsoft had already proven online gaming by that point.
I believe there was a modem adapter for the PS2 too, but I don't know much about that.
The Dreamcast had a built in modem and some models of PS2 had one built in.