Anybody happen to know which ultra-wide SCSI adaptor is most likely to be
NetBSD-compatible?  I assume if the card comes with an Open Firmware driver
there is a chance.

Adaptec 2940UW  (not up for the 2940U2W)
Initio Miles/INI-9100UW
MacGurus Jackhammer

No mention of Open Firmware I have seen with any of them, but haven't been
exhaustive.

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Feasibility of a new signature is currently being evaluated.
h.b.hotz@jpl.nasa.gov, or hbhotz@oxy.edu