Did you get the X-Surf-100 working with the Amiga 500 Zorro II adapter board from the checkmate case?
I just read this blog and it seems to be working here (with a vampire v2)
Never did, I essentially had the same setup as what was shown in that blog. I gave up on it honestly, I put the vampire and motherboard back in the original A500 case. For my Checkmate case, I'm switching it with my A600 with Vampire setup, but waiting on the back panel I ordered in the second Checkmate production run. My X-Surf-100 and Rapidroad are sitting on a shelf at the moment, I may get my A2000 working again, but have no accelerator for it as It's now in my A500.