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Synths that use the YM3812

Yamaha PSR11 49keys 16sounds (1986)
Yamaha PSR12 49keys 32sounds (1987)
Yamaha PSR31* 61keys 16sounds (1991)
Yamaha PSR32* 61keys 32sounds (1987)
Yamaha PSS460 49keys 21sounds (1986)
Yamaha PSS470 49keys 21sounds (1987)
Yamaha PSS560* 49keys 21sounds (1986)
Yamaha PSS570* 49keys 21sounds (1987)

*While it does use the YM3812, it also uses an additional chip for drums.

Synths that use the YM2413 (cost reduced YM3812)

Yamaha PSR6 49keys 100sounds (1994)
Yamaha PSS140 37keys 100sounds (1988)
Yamaha PSS170 44keys 100sounds (1986)
Yamaha PSS270 49keys 100sounds (1986)