In General
The DM-1 Delay Machine from 1978, Boss's first delay device, offered an affordable alternative to more expensive echo devices. Although it was limited in terms of frequency response and versatility compared to Roland's Space Echo, the analog DM-1 offered a distinctive sound and delay times ranging from 25 to 500 milliseconds. Unlike the subsequent BBD-based models in the DM series, the DM-1's circuitry used a charge-coupled device (CCD), an electronic component that later became common in digital cameras. The DM-1 was manufactured for less than two years. It was followed in 1981 by the much smaller DM-2 in the compact housing of the new Boss design.