No, there's a region lock out. You can fuck about soldering some chip from an NTSC cart into a PAL N64 IIRC, but an adapter is easier. It fits the slot, so no modding required. Get a decent adapter, something like apisspassport 3.
You can remove the tabs on a USA N64 to play Jap games, the only difference is the cart slot, tabs.
Edit: PAL SNES is the same, you need an adapter. Early Mega Drives just needed the cart slot widening.
Last edited by Jackhammer; 25th-April-2011 at 21:27.