The pinouts of both PCE and USA TurboGrafx addon are the same. The only problem is the shape of the connectors, PCE uses rectangle connector while TG-16 used trapezoid shaped connector.
Is the shape just the only limitation or is there another reason USA and Japanese accessories can't be cross mated? I'd like to try and plug the white PCE into my USA TurboCD, and Tennokoe2 bank on my TG-16 console.
If there's no limitation, I got files and I'm not afraid to use it. :-" Well, I'm not hacking the TurboCD, it's frickin' expensive to replace if it breaks.