BOSS DR-55 (1980)
A programmable analog drum machine released by Boss in 1980, notable for its step-write pattern programming and use in early electronic music.
Overview
The BOSS DR-55, also known as the "Dr. Rhythm," is a programmable rhythm machine manufactured by Boss and released in 1980. It features analog sound generation and offers four primary sounds: bass drum, snare, hi-hat, and cymbal, with the snare including a rimshot voice. The DR-55 was one of the first drum machines to implement step-write-style pattern programming, allowing users to input rhythms step by step. It includes PLAY and WRITE modes for pattern creation and playback, positioning it as an early tool for hands-on rhythm composition.
Specifications
| Sounds | Bass drum, snare (with rimshot), hi-hat, cymbal |
| Pattern Programming | Step-write-style |
| Modes | PLAY and WRITE modes |
Design
The DR-55 uses analog sound generators for its drum voices, giving it a warm, electronic character typical of early ’80s rhythm boxes. Its circuitry supports internal pattern sequencing, though user reports indicate recurring issues with the sequencer functionality.
Context
Recognized as one of the first step-write-style drum machines, the DR-55 holds a place in history as an early programmable rhythm device. It was adopted by experimental musicians and is noted as the drum machine used by a member of a fledgling group in 1980, affectionately referred to as "Dr. Rhythm."
Market
Units in good condition with original box and manuals have been found locally for $200, while others have been listed around 150€ despite long periods of disuse. Common issues include malfunctioning sequencers, failure to clear patterns, and audio dropouts in Play mode—particularly affecting all sounds except the hi-hat. Users have modified units to add trigger inputs and MIDI sync capabilities. Service and operation manuals are available for download from multiple sources, supporting repair and restoration.
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Related Models
- Roland CR-78 (1978-1980)
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- Roland TR-808 (1980-1983)
- Roland TR-909 (1983-1985)