The PSR-31 uses 2-operator FM synthesis based on the Yamaha YM3812 OPL chip.
Year Released: 1991
Keyboard: 61 keys
Polyphony: 9 notes
ROM: 16 sounds, 16 rhythms
Dimensions: 913 mm x 331 mm x 96 mm
Weight: 6.8 kg
This keyboard has built-in 2.5-watt stero speaker(s).
Batteries: D x 6
Yamaha PSR-31 Portatone Service Manual 1986 ($15)
Yamaha PSR-31 1986 - black ($95)
Yamaha Portatone PSR-31 Service Manual [Three Wave Music] ($12)
Power Supply Replacement for YAMAHA PSR-31 KEYBOARD ADAPTER UK 12V ($14.28)
Rockville 61 Key Keyboard Case w/ Wheels +Trolley Handle For Yamaha PSR-E263 ($139.95)
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