I now have a Yamaha DX7, and a Yamaha DX7IIFD with Grey Matter E! Card, and a Yamaha TX816 Midirack and an assortment of cartridges. I am working to learn how to create new patches for the DX7. My notes on Yamahaequipment, including the DX7.
How to Understand and Program Your Yamaha DX7 - Lorenz M. Rychner - Alexander Pub., 1985 - Synthesizer (Musical instrument)
This book has been designed for use in front of the Yamaha DX7. It's written in a tutorial manner, taking [the reader] step-by-step through the operations of this … instrument.-How to get the most out of this book.