Ok, having faffed and searched round the net, it looks as if the printer is not compatible with the USB adapters. Not that I could find one at a reasonable cost anyway! So, I've borrowed a computer from work which has XP, and a spare PCI slot. Can I use any SCSI card with an external port? There are a couple of raid SCSI cards, so I guess I don't need them. Looking on the eBay there are tons of different ones, some from £10 to £££.
This one
http://www.ebay.co.uk/itm/NEW-ADAPTEC-I ... 3cc1c28c2b is boxed brand new and has an external 68 pin connector, so I could use a 68 to 50 pin cable. Is that going to solve my problem?