It has been tested using batteries and is in good working order.
Yamaha PortaSound PSS-140 Electronic Keyboard – Boxed & Working – Vintage Yamaha
Yamaha Portasound PSS-30 Vintage Keyboard Electronic, Working
Vintage 1982 Yamaha PORTASOUND MP-1 Electronic Portable Keyboard - FULLY WORKING
Yamaha Portasound PSS-170 Electronic Keyboard. Very Good Used Condition.
Electronic Keyboard Yamaha PortaSound PSS-130 Boxed Portable
Yamaha PSS 380 Electronic Keyboard Portasound Vintage Digital Synthesizer
