I have some USA n64 carts and want to use them on a pal console.
I've think in three alternatives:
1- Open and mod the console (there should be some lockout chip arround here)
2- Open the carts and mod them
3- Build an import adapter. If someone have one, he can open it and draw some schematics....I don't plan to buy one of these if they are very spensive.
1) Not really possible unless you have an NTSC console to pull the chip out of, in which case you'd... already have an NTSC console.
2) Yes, you can do this but it's a lot of work and there are about 7 different lockout (CIC) chips for NTSC and PAL. So you would need to collect ones from the right carts in order to boot the right games, and make up a socketed cart that would enable you to change the CIC chip to the right one each time.
3) The easiest option, but still not exactly easy. You need all the pins to go through to the machine except the ones that control booting, open up a cart and trace from the CIC chip to the pins to see which ones, or find a cart pin-out somewhere and you'll see. Open up any Universal adaptor for details. You may also need to play about with resistors, because sometimes PAL carts contain them where NTSC ones don't, and vice versa.
Sorry I can't be much help, but it was very much back in the N64 day that we learnt this. Shout to the Dextrose massive