It has been tested using batteries and is in good working order.
Electronic Keyboard Yamaha PortaSound PSS-130 Boxed Portable
YAMAHA PORTASOUND PSS-270 Electronic Keyboard vintage 1980's
Vintage Yamaha Portasound PSS-31 Electronic Keyboard Synthesizer Tested Working
Yamaha Portasound Voice Bank PSS-270 Electronic Keyboard ~ Vintage
YAMAHA PSS-170 Electronic Keyboard PortaSound Portable Vintage - EHB
Yamaha PortaSound PS-400 Electronic Portable Keyboard In Original Carry Case Box
