I havent tried it recently. I vaguely recall screwing around with a generic power supply on a 520 long long ago when mine died. Back when I was actively dicking around with these machines in the late 1990s/early 2000s. 

Arnt these guys 16V? I honestly dont remember. 

As far as the pinouts, I remember them being on the web back in the day, but a quick google search has reveled that most of the pictures, charts, and information are long long gone. Has flown through the internets tubes and already in the toilet.