What happens when you put a US card in a Jp PC Engine?

[Jay]

I've just got hold of a Duo which supposedly plays US and Jp cards.

US cards just give me a purple screen. Is this what happens on an unmodded machine?

Thanks

[J0e Musashi]

There'd be a switch if it was modded.

[Jay]

There'd be a switch if it was modded.

Brilliant, thanks for the info. Much appreciated.