Analysis of information sources in references of the Wikipedia article "Yamaha DX1" in English language version.
Panel Layout, p. 5
Although the DX1 may seem like a better buy than the more popular DX7, remember that the DX1 is expensive. There were only about 140 of these synths made and the retail value of a DX1 during its production year in 1985 was $13,900. ...