From Wikipedia
The Roland TR-909 Rhythm Composer, commonly known as the 909, is a drum machine introduced by Roland Corporation in 1983, succeeding the TR-808. It was the first Roland drum machine to use samples for some sounds, and the first with MIDI functionality, allowing it to synchronize with other devices.
The 909 was a commercial failure, as users preferred the more realistic sounds of competing products such as the LinnDrum. Roland ceased production after one year, having built 10,000 units. However, it became popular on the used market and influenced the development of electronic dance music genres such as techno, house and acid house.