Comes with cartridge 3, which allows you to factory reset the DX7. Also I will send you my sysex library which includes patches I’ve found and made. You can easily send sysex patches to the DX7 via MIDI and a sysex librarian program.
• Yamaha 3, 64 Patches
• Yamaha 4, 64 Patches
• Yamaha DX7 Data Cartridge, 32 Patches
• Bo Tomlyn’s Best of the USA, 64 Patches
• Bo Tomlyn’s Top Forty, 64 Patches
This was the coveted instrument in the mid 1980s that I didn’t have, though I did get a TX81Z module which I have to this day. These days, we at CatSynth also have a Yamaha TX802 module (essentially a multitimbral timbral module that shares the DX7’s 6-operator FM architecture), so not much need for another. But if you are looking for this (in)famous instrument, this auction might be worth a look.