Tested with DC power adaptor and AA batteries ( not included). All keys and buttons working.
Vintage Yamaha Keyboard Portasound PSS-20. Working. Made in Japan With Box
Yamaha PortaSound PSS-140 Electronic Keyboard – Boxed & Working – Vintage Yamaha
Vintage Yamaha Portasound PS-300 - 37 Key keyboard with Case
1980s Vintage YAMAHA PS-2 Portasound Mini Keyboard in case
Vintage Yamaha Portasound PSS-9 Electronic Keyboard Black Voice Bank 32-Keys
Vintage Yamaha Portasound PSS-31 Electronic Keyboard Synthesizer Tested Working
