As the Nintendo DS and 3DS age into the retro category, keeping cartridges in working condition gets harder and harder.
[Modern Vintage Gamer] recently came across a pre-release version of Turok 3 for the Nintendo 64, and set about dumping and preserving the find. (Video, embedded below.) With one-off cartridges ...
Your other option is to modify your N64 so that it directly outputs a clean HDMI signal, and that's not too expensive, though it runs the risk of going wrong, and in many cases you'll have to ...