I've got what I'm fairly sure is some model of M4-Data 9-track drive in a "desktop" enclosure, relabeled as an "Interface Data, Inc." drive. It's similar, but not identical, to the 9914 for which there is documentation on Bitsavers. It appears to do 1600 and 3200 BPI (not sure what encodings.) It has a Differential SCSI interface option, along with a Pertec interface. It's labeled on the back as "Model No. 9946." I have some pictures I took when I first got it (it hasn't changed much since then) at: http://yahozna.dyndns.org/scratch/9-track/ The tape transport seems to be working fine (it loads and unloads, moves to BOT and rewinds just as I'd expect. The auto-loading procedure on these drives always seems magical to me...) but there's something wrong with the digital side of things. I've made a few attempts over the past couple of years to use the Pertec interface (with the Diff SCSI interface removed) but all reads result in parity errors. It may just be a configuration issue -- there are tons of configurable settings via the front panel -- but I lack the documentation to know what they are (they are not the same as the 9914's as far as I can tell) or to do any other testing. Picked this up almost three years ago (time flies!) and it's just been taking up space. Time to get it out of here. Anyone want it? It's free! Pickup only in the Seattle area. And if anyone in the Seattle area has a Pertec-interface 9-track drive they want to part with, let me know :). - Josh