This is the original BIOS for this controller. It does have a 1 GB drive limit, but otherwise works fine. I have dumped these files myself with my Genius G540 USB programmer.
This is the final BIOS for this controller. Highlight is drive support up to 8 GB. This makes using this SCSI controller really nice for a 386 or 486 DOS machine as you can break the 500 MB BIOS limitation. There is a jumper to set, so check the documentation.