FWIW I found a cheapo Adaptec PCI SCSI card and built a kernel
with the ahc(4) device and options AHC_TAGENABLE, and things are Just Peachy.

&^*^$# ncr driver -:)

Unfortunately SDR doesn't see the Adaptec board, but I don't
think that's much of a problem.

	Sean.
- --
# mount_cd9660 -e -o ro /dev/cd0c /mnt
# ls /mnt
TRANS.TBL    binary       boot.catalog boot.i386    installation

ahc0 at pci0 dev 12 function 0
ahc0: interrupting at isa irq 5
ahc0: aic7850 Single Channel, SCSI Id=7, 3 SCBs
ahc0: Host Adapter Bios disabled.  Using default SCSI device parameters
scsibus1 at ahc0 channel 0: 8 targets, 8 luns per target
...
scsibus1: waiting 2 seconds for devices to settle...
ahc0: target 0 synchronous at 10.0MHz, offset = 0xf
cd0 at scsibus1 targ 0 lun 0: <TEAC, CD-R55S, 1.0K> SCSI2 5/cdrom removable