>Can you give a bit more detail on the cards in use? If they are ISA, the probability is you're in a good deal of trouble on interrupts, since ISA doesn't share IRQs.

Uh-oh :( I think you've cleared things up. The original SCSI is an ISA for an add-on internal CD. That means there isn't any way I can resolve this with both devices present? The two devices are the CD & that (new HP 6250C) scanner I was posting about a while ago...

The two cards are Adaptec ISA and a new Advansys PCI...