Are you sure that the card chipset is Aha-152X ?. I had the same problem when I first test my Bus Toaster card. At last it resulted that bus toaster cards newer than 1997 uses a symbios chipset, that are only partialy supported ( I still can't use my card with Linux ).
If the part number ( over the barcode ) is 404-15-002A, it uses symbios chipset.
Good luck, and happy new year.