via this eBay listing
"Fully working tested with DX7 mk1
Original Sound Logic MusicPack MR-2 ROM cartridge for the Yamaha DX7, complete with its original gold Sound Logic sleeve. Early third-party DX7 cartridge that rarely appears on the market, especially with original packaging.
Details
MusicPack MR-2
YAM128
Yamaha DX7 ROM cartridge
Made in USA
Gold-plated contacts
Original sleeve included
Condition
Cartridge in good vintage condition
Packaging shows authentic age wear
Contacts clean
Genuine early FM expansion and a hard-to-source piece for serious DX7 collectors."
