me too! somehow in my retro computing/gadget collecting I ended up with two Data Discmans, a DD-8 and a DD-10BZ, they both work fine and the DD-10 is complete in original box as well.

There is authoring software available at http://www.robotsandcomputers.com/computers/dd8h.htm to create compatible CDRs full of books assuming you can find some blank Mini CD-Rs or CD-RWs.

neat devices, Sony was always ahead of the time