Can anyone identify this 9-track drive?

I picked up an old 9-track drive and thus far I've been unable to identify what, precisely, it is. I have a couple of pictures at: http://yahozna.dyndns.org/scratch/9-track It has no manufacturer or brand information on it other than an "Interface Data, Inc." label on the front and a label on the back indicating that it is Model No. 9946. I can't find any information at all on the 'net going by this information. I'm guessing that it's a rebranded drive. It is a desktop unit, horizontally mounted and self-threading. As far as I can tell from examining it and fooling around with the front panel buttons it has a SCSI interface and does 1600 and 3200bpi. In the back of the unit are 5 slots, 4 of which are filled with cards. It appears to power up fine, but I can't get it to show up on the SCSI bus when hooked to a PC -- I don't know if the interface is broken or if there's some configuration I need to do. Any ideas? I'd like to find a manual for it so I can figure out what it can do and how to configure it. Thanks as always, Josh