The Yamaha DX7 IID is a later version of the Yamaha DX7 with a bi-timbral sound engine, patch memory, and a better MIDI implementation. Just like the DX7S, it also has an improved DAC with 15 bits of resolution instead of the original DX7's 12 bits. The DX7IIFD is a variant with an internal floppy drive for storing patches.
It can also store patches on a RAM4 cartridge.
Year Released: 1987
Keyboard: 61 keys with velocity and aftertouch
Polyphony: 16 notes
Multitimbral: 2 parts
User Patches: 64
User Performances: 32
Screen: 40 x 2 character LCD plus 2-character 7-segment LED
Dimensions: 999 mm x 85.8 mm x 333.7 mm
Weight: 10.5 kg
Yamaha DX7 IID vintage synth ($499.99)
Yamaha DX7 II-D 1980s ($300)