The October 30th versions of netbsd.quadra and netbsd.quadra_dual behave
identically on my Quadra 950.  Here is the log of the relevant-seeming
portions of the boot log plus a bit of context (copied by hand off the
screen, so apologies for any typos):

....
asc0 at obio0 Apple Sound Chip.
esp0 at obio0: address 0x84e000: NCR 53C96 25MHz, target 7
scsibus0 at esp0
sd0 at scsibus0 targ 0 lun 0: <QUANTUM, PD425S, 606_> SCSI2 0/direct fixed
sd0: 406MB, 1520 cyl, 9 head, 60 sec, 512 bytes/sec
st0 at scsibus0 targ 1 lun 0: <ARCHIVE, Python 25501-XXX, 2.50> SCSI2 1/sequential removable
st0: drive empty
sd1 at scsibus0 targ 4 lun 0: <QUANTUM, FIREBALL1080S, 1Q09>, SCSI2 0/direct fixed
sd1: 1042MB, 3835 cyl, 4 head, 139 sec, 512 bytes/sec
esp1 at obio0: address 0x84e400: NCR53C96 25 MHz, target 7
scsibus1 at esp1
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
esp1: SCSI bus reset
zsc0 at obio0 chip type 0
....
panic: cannot mount root


The probe of the internal SCSI bus is entirely correct and agrees with the
information returned by HDT Prober.  I haven't yet repartitioned the drive
to have a UFS partition, so the panic is entirely reasonable.

Any idea what's up with the external SCSI bus?  I've got two devices on it
-- a CD-ROM drive and an old 105MB LaCie Tsunami HD.

Hope this info is helpful/useful...

-- 
Jonathan Lennox
lennox@cs.columbia.edu