The machine is in good working condition, it plays 80% of the sounds ( Kick, Snare, Hi Hat, Tom, and some Percussion), but needs service.

It comes with 7 voice cards, some of them are not working, and needs service.

With proper service, the machine can be returned into mint condition.

From Wikipedia:

The DMX is a programmable digital drum machine manufactured by Oberheim. It was introduced in 1980 at a list price of US$2,895 (equivalent to $10,700 in 2023) and remained in the company's product line until the mid-1980s.

The Oberheim DMX was the second digital drum machine ever to be sold as a commercial product, following the Linn LM-1 Drum Computer in 1980. Its popularity among musicians of the era contributed to the sound and evolution of 1980s new wave, synth-pop and hip hop music.

The DMX features 24 individual drum sounds derived from 11 original samples[1] and allows for a maximum 8-voice polyphony; one voice per card. It also featured eight separate outputs for individual processing, and allowed up to 100 sequences and 50 songs. One of the distinguishing features of the DMX is that it allowed integration with Oberheim's proprietary interfacing system (the Oberheim Parallel Buss) that pre-dated MIDI and allowed Oberheim equipment to be synchronized with the machine. Later models included factory-fitted MIDI ports and third-party companies also manufactured MIDI interfaces for the DMX.[2]

Drum and percussion samples are stored in EPROM chips placed on removable voice cards.[2] The data format is 8-bit PCM using μ-law companding, increasing sound resolution to approximately 12 bits in the analog domain (a design technique also employed by other early drum machines, including products by Linn Electronics, E-mu Systems and Sequential Circuits).

The DMX's punchy and realistic drum sound made it attractive towards many artists and producers involved in the fledgling hip-hop scene and it is featured on many of the genre's early landmark recordings.