Sounds like you have an HP. I have a Scanjet IIcx that came with that crappy-ass ISA card. Everytime I had to reinstall Windows, getting that thing to work was a pain.

Currently, I have a generic PCI SCSI card for the purpose of keeping that workhorse of a scanner. My freind Moe always has weird cables. This is likely the one you need. It's the one I have. Works like a charm.
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-Rob Riccardelli
80GB 16MB MK2 090000736