>> Ah, there's the difference, then: the reason the swapped-wires case
>> doesn't work is that they disagree over the ordering between their
>> IDs.
> I don't even think you need to swap wires -- it's a bus; all devices,
> including the host adapter, are equal, as I understand it.

Yes, but.

What I was looking for was a way to connect two devices, each of which
thinks it's at ID 7, without producing a conflict.  It appears there
more or less is no such way (since swapping the wires produces an
arbitration conflict by breaking the assumption that any given device
is at the same ID as seen by all devices); the best suggestion seems to
be mycroft's, to have at least one of the hosts change its SCSI
interface's ID.

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