Patch demos and tutorials of the late 80s Yamaha FM 6op, 4op and 2op synths, starting with Sound Source Unlimited's amazing patches from the 80's and 90's!
You can sometimes find the disks on eBay, Reverb, or auction sites. Greytsounds carries some of the banks. Also check out Bobby Blues' page where you will find more patches than you could ever get through in a lifetime. The Bo Tomlyn banks are particularly good as are the Yamaha carts.
IRL I am a professional composer and would love to connect with anyone making a fun retrogame in the Sierra style. Or a modern videogame. Just saying.