Scsi is a strange beast. Some devices work with no termination, most don't (and those that do might not work reliably )

I'll also mention that I make terminated SCA to 50 pin scsi adapters, uniserver should have a stock of them if he has found the time to sort a small manufacturing problem he encountered They terminate all 16 bits on the sca drive so allow a bigger selection of drives to be used than the passive adapter + pass through terminator option