This is of course as long as the Fast SCSI is at the end of the chain. cyperstorm board -> UW SCSI -> UW SCSI -> FAST SCSI. If the FAST SCSI is in betweeen two UW SCSI devices transfer would not be at UW SCSI rate.
You can even have
UW SCSI -> cyperstorm board -> UW SCSI-> Fast SCSI.
Fast SCSI -> Cyperstorm board ->UW SCSI->UW SCSI.
The Cyperstrom MK III does not have active termination even if the board is the last device you need to add active ternination after the board and at the other end of the chain.
gwalp