Old scanner compatibility with Yosemite?

I have an old scanner a UMAX Astra 6400 which I can't get my newly upgraded Yosemite system to register. I'm using the FireWire 400 interface and the scanner is powering on correctly.

I think it might be TWAIN compliant and I'm aware support was dropped for TWAIN back on 10.5.

I have also tried installing this TWAIN Bridge package to see if it would work, but still no luck.

Any ideas on how I can get this scanner working with my Yosemite system?