RX21
| Manufacturer | Yamaha |
| Function | Drum Machine |
| Produced | 1985 |
| Country | Japan |
| Form Factor | Desktop |
| Signal Path | Digital Hardware (including Analog Connections) |
| Dimensions | 350 mm x 202.5 mm x 55.5 mm |
| Weight | 1.3 kg |
| Notes | Number of Pads: 9 Polyphony: 9 notes Preset Patterns: 44 User Patterns: 56 User Songs: 4 Tempo Range: 40 - 250 BPM Screen: 16-character LCD |