YAMAHA Keyboards Catalog 1985
from the '70s to '90s, Scanned Catalogs of Electric Guitars, Basses, Amps, Effects and Keyboards - Published in Japan
Yamaha DX27/DX100 Synthesizer Catalog 1985
DX27/DX100 catalog in 1985
4 operator, 8 algorithm FM synthesizers DX100 and DX27. DX100 is mini 49-keys, DX27 is regular 61-keys.
DX7 and DX21
Oct. 1985 issue