There's a terminator on the end of the cable. What I've read though is that Quadras 950 are terminated on the motherboard and hard drives should not be terminated. http://support.apple.com/kb/TA47480?viewlocale=en_US

I've ordered a replacement cable. I have a 76gb sca scsi drive with a adapter I did get the Mac to see on Position A of the cable (Positions B-D do not work).