Yamaha PSS-680 MIDI PortaSound Keyboard Original Service Manual, Schematics Book | eBay
Yamaha PSS list
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Yamaha PortaSound PSS-470 | Vintage Synth Explorer
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Yamaha PSS list
Yamaha PSS-A50 : MIDI Controller - More Possibilities with MIDI Connectivity - YouTube
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OT - The YAMAHA PSS 460 - I Still Love These Ultra RETRO Synths — Audiobus Forum
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