I seem to remember seeing some stuff that suggested that it was in a usable state as a combination ISA bridge (intended to be used for Ethernet I believe)/ATA interface, and that limited support exists somewhere in the Linux and/or NetBSD port. I'm really not sure though.
edit: poked around a bit and found more info at bITmASTER's new page.
I remember seeing a japanese site that showed this with photos and an explanation of how they were able to do this. I was searching on google for info on game basic at the time. I'll root around in my b/u cd's and see if I can't find the sight or at least the pics.(I know i saved them somewhere.)