Cool. The symptoms were very similar to my problem, but on your board, the software at least detected that something was out there. On mine, SCSIProbe just blinks "SCSI Bus Not Terminated" and only shows the Mac itself at SCSI 0. I'm convinced it's nearly an identical failure, but also just as convinced it's a different pin (1 of 42). Guessing which pin clearly won't get me there, hence my search for documentation. I'm going to check the termination pin on the 53C80 first. I've got to check Trag's refernce to see if it states what the voltage for that pin should be. I'm limited to a simple multimeter/continuity tester for testing so anything that requires a scope is out of my league.