Need help with UMax Astra 600S scanner

[Theophylact]

The scanner is obsolete, but it still works. It's a SCSI scanner, and the VistaScan drivers originally supplied don't work under WinXP. I had a workaround when I installed it on my old machine, but that's now dead, and the new one isn't recognizing the scanner at all, and I've forgotten the workaround. (I think it involved trying to get Paint to scan anything; but I've tried that, and it's no go.) UMax no longer provides support for this product since January 1.

Any help would be appreciated. I can, of course, buy a new USB scanner; but that would be accepting defeat.