There's an excellent retrospective on YouTube about the xband and how it was built. It was a product ahead of its time.
For example, the way they got games that weren't built for laggy multiplayer to work was unbelievable: they recognized the cartridge and patched the code. Yes, that means every game that worked was a result of a custom built patching of that game's code at run time!
That’s a great video, thanks for posting it. I remember hearing it was similar to how a Game Genie worked, but that’s a lot more work than expected. Very impressive for 1993-1994.
For example, the way they got games that weren't built for laggy multiplayer to work was unbelievable: they recognized the cartridge and patched the code. Yes, that means every game that worked was a result of a custom built patching of that game's code at run time!
https://youtu.be/k_5M-z_RUKA