> I'm contemplating using SCSI interfaces as a networking medium.  Does

This would be very cool ... potentially faster than 100bt, cheaper than
giga-ethernet.

And for machines that will never have 100bt hardware, it would allow you
to get at them quicker by using another machine as a router.

> anyone have any thoughts on where I should look for (a) convincing a
> machine that it should speak on other than ID 7 or (b) convincing a

Some machines have a eeprom/nvram setting for the host's SCSI ID, but
I expect that this is only used by the boot firmware. You'd probably have
to UTSL to find the relevant kernel code.

> Oh, it is also important that both hosts be able to speak to disks on
> the bus.  (Yes, I do intend to make sure they use disjoint subsets of
> the drives present. :-)

This is definitely possible; it's been done before. Back in the heyday of
the Apple II in elementary schools, you could buy a SCSI card from CMS
peripherals that would let you share one hard drive among multiple hosts
on the same bus. As you'd expect, read-only partitions were accessible to
all hosts and writable partitions were exclusive to one host.

I'm pretty sure they used an NCR 5380 with smarter host software. All
the Apple-branded SCSI hardware from that era did.

Todd Whitesel
toddpw @ best.com