ROLAND DR-55. Original packaging, manuals. Excellent-scratchy condition, fully functional, highly collectible. Year of manufacture 1981. Included is a PDF with the service manual and schematics of the DR-55. Exchanges, only with Studio - Recording - Live P.A. equipment.

https://www.youtube.com/watch?v=esKJbhMQ6wY

https://microchop.substack.com/p/the-boss-dr-55-dr-rhythm-drum-machine