The DX27 is a 4-operator FM synthesizer with 8 available algorithms. It is a version of the Yamaha DX100 with full-size keys (but no velocity or aftertouch) and contains all of the same sounds. There is also a version with built-in speakers, the DX27S.
Thanks to Paul Read for the service manual and schematics.
Year Released: 1986
Keyboard: 61 keys
Polyphony: 8 notes
Preset Patches: 192
User Patches: 24
Screen: 16 x 2 character LCD
Dimensions: 909 mm x 270 mm x 82 mm
Weight: 7.5 kg
Yamaha DX27S ($350)
Yamaha DX-27s (DX-100 / Warranty) ($317.28)