Go to the Yamaha DX7s main page
From this page you can download Yamaha DX7s SysEx (System Exclusive messages) files, containing voice and performance data (also known as patches) for the Yamaha DX7s synthesizer.
My thanks to vintage gear fan and DX7s owner, Bruce Brooks, who provided the SysEx files available on this page. He used them to restore the internal voices in his Yamaha DX7s, after replacing its battery and finding his ROM cartridge was faulty. Bruce loaded the internal patches into his DX7s with Bome Send SX and reported they worked perfectly. However, he was unable to try the cartridge patches, as he didn't have a RAM cartridge to write them to.
To download all the internal and cartridge voice and performance patches, packaged in a single ZIP file, use the 'Yamaha DX7s SysEx voice and performance files' link.
To download one, or more, individual SysEx files, use the appropriate individual 'Internal patch', or 'ROM Cartridge patch' link.
Patch editor / librarian apps, plus many custom patches, are available from many reputable websites. You can find out more at the world famous 'Dave Benson's DX7 Page' here: