I have an HP 98041A disc interface available. This is a desktop type box that has a cable and big module that plugs into some kind of HP 98xx calculator/computer. The box has an HP-IB port on the back. As best I can tell, this box plugs into the HP-IB port of large old 14" HP drives like the 7906H, or, in the configuration I received it, the box plugs into the HP-IB port of an HP-IB optioned 13037 controller. This would allow the calculator to use non-HP-IB drives such as the 7905, 7906A-D, and 7920. This particular one was hooked up to the HP-IB port on a 13037 running to a 7906D drive. I have no need for this, it's available for trade. I have no way to test it, but based on the things I received in this load, I would hazard a guess that it probably does work. Jay West