You may need to do a couple of things--- some devices have auto-termination (many of the newer ones, and most internal devices). You may need to toggle a setting on your SCSI Bios or a jumper setting on the card to allow this to happen, however.
It's possible that there's also a jumper on each device that sets auto-termination. This is fairly uncommon, but something you may want to check.
Sadly, I don't know anything about NCR SCSI products. When buying SCSI cards, (unless you're on a budget) you should go with Adaptec products-- they tend to be the standard to which most PC SCSI specs are written. You often risk incompatability in some areas otherwise (I have two SCSI cards, an ADVANSYS, which I like alot and a ADAPTEC, which is a bit older and slower. When I wanted to "flash" upgrade my CD-Writer, the ADVANSYS couldn't do it. Worked on the first try with the Adaptec though.)