Now make sure your SCSI ID number is set. Start high, keeping in mind that the Mac itself needs ID 7 to work. My Macintosh isn't recognizing my SCSI device. Try mounting the cartridge with SCSI Probe or Mt. Everything 3. I've tried everything, and my SCSI chain is just not working.
SCSI chains are very sensitive.
One weak link can take down the whole line. As a last resort, try connecting one device at a time. Try an intelligent terminator. Borrow or use cables that are known to work. Try the device on a friend's Mac.