SCSI with SCO xenix

[Super user]

I have a ZEOS 386 which came with a Seagate ST296N drive and ST02 Host
Adapter -- SCSI configuration.  I also have the SCO-Xenix 2.3.2 386GT
operating system.  Is there any hope of using Xenix with this system?
The xenix release notes state that only the Adaptec AHA-154x SCSI host
adapter is supported.  I cannot find any such adapter listed in any of
my hardware sources.  I would greatly appreciate hearing from anyone
who has been able to set up an SCSI system with SCO-Xenix386 or finding
a source for the Adaptec SCSI host adapter.
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