Sorry for taking so long to reply, real life got in the way and the cricket World Cup started this weekend!! I think I do have the install disk somewhere, I'll look for it. I know that the install disk only allows you to install OFS on the drive, it doesn't allow you to add any file systems to the RDB.
I haven't tried using the startup-sequence to add a filesystem, I used a GVP IOExtender card that had a boot rom socket on it to add the 3.15 rom. The only problem is that you can't do a warm reboot, the A2000 would just hang with a black screen, you'd have to switch it off and on again to boot.
I tried every possible way to get the 3.15 rom working on the HC+2 card, split it into odd and even, byte swapped it, created a checksum etc. Nothing worked. Unfortunately I don't know how to remaster the rom and change the bootcode so that it'll work without a PAL change. Hopefully someone out there can do it!
