Any thoughts on how to fix this?

I checked the cabling and termination, but things seem unhappy in
a suspicious way.

	Sean.
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cpu0 at mainbus0: ID 0 (primary), 21064A ()
apecs0 at mainbus0: DECchip 21071 Core Logic chipset
apecs0: DC21071-CA pass 2, 64-bit memory bus
apecs0: DC21071-DA pass 2
pci0 at apecs0 bus 0
pci0: i/o enabled, memory enabled
ncr0 at pci0 dev 6 function 0: ncr 53c810 fast10 scsi
ncr0: interrupting at isa irq 11
ncr0: minsync=25, maxsync=206, maxoffs=8, 16 dwords burst, normal dma fifo
ncr0: single-ended, open drain IRQ driver
ncr0: restart (scsi reset).
scsibus0 at ncr0: 8 targets
sd0 at scsibus0 targ 5 lun 0: <iomega, jaz 1GB, H.71> SCSI2 0/direct removable
sd0(ncr0:5:0): 10.0 MB/s (100 ns, offset 8)
ncr0: aborting job ...
ncr0:5: ERROR (90:0) (0-22-0) (8/13) @ (script 1c4:900b0000).
ncr0: script cmd = 910a0000
ncr0: regdump: da 10 80 13 47 08 05 1f 01 08 02 2a 80 00 02 00.
ncr0: restart (fatal error).
sd0(ncr0:5:0): COMMAND FAILED (9 ff) @0xfffffe0000019800.
ncr0: aborting job ...
ncr0:0: ERROR (90:0) (0-22-0) (0/3) @ (script a0:430000a8).
ncr0: script cmd = 878b0000
ncr0: regdump: da 00 00 03 47 00 05 1f 31 08 02 22 80 00 02 02.
ncr0: restart (fatal error).
sd0(ncr0:5:0): COMMAND FAILED (9 ff) @0xfffffe0000019800.
ncr0: aborting job ...
ncr0:0: ERROR (90:0) (0-22-0) (0/3) @ (script a0:430000a8).
ncr0: script cmd = 878b0000
ncr0: regdump: da 00 00 03 47 00 05 1f 31 08 02 22 80 00 02 02.
ncr0: restart (fatal error).
sd0(ncr0:5:0): COMMAND FAILED (9 ff) @0xfffffe0000019800.
sd0: drive offline
sd0: drive offline
ncr0: aborting job ...
ncr0:0: ERROR (90:0) (0-22-0) (0/3) @ (script a0:430000a8).
ncr0: script cmd = 878b0000
ncr0: regdump: da 00 00 03 47 00 05 1f 31 08 02 22 80 00 02 02.
ncr0: restart (fatal error).
probe(ncr0:5:1): COMMAND FAILED (9 ff) @0xfffffe0000019c00.
ncr0: aborting job ...
ncr0:0: ERROR (90:0) (0-22-0) (0/3) @ (script a0:430000a8).
ncr0: script cmd = 878b0000
ncr0: regdump: da 00 00 03 47 00 05 1f 31 08 02 22 80 00 02 02.
ncr0: restart (fatal error).
probe(ncr0:5:1): COMMAND FAILED (9 ff) @0xfffffe0000019c00.
ncr0: aborting job ...
~ncr0:0: ERROR (90:0) (0-22-0) (0/3) @ (script a0:430000a8).
ncr0: script cmd = 878b0000
ncr0: regdump: da 00 00 03 47 00 05 1f 31 08 02 22 80 00 02 02.
ncr0: restart (fatal error).
probe(ncr0:5:1): COMMAND FAILED (9 ff) @0xfffffe0000019%c00.

etc all the way through all the SCSI IDs. :(