I have the worst adapter ever, that I bought for 10 bucks at Lik-Sang a few years ago, and the PSX part of it died...but the N64 part lives on. It's cheap. Get one.
You can get a GREAT adaptoid (check the ZDnet referral page from our site, actually) for like 30 something dollars. IIRC, it even supports the peripherals, like rumble and memory card. $30 versus $300 seems like a no brainer.
And it's true that N64 emulation isn't perfect. I've been wanting to play Rogue Squadron in high res (there is a cheat in game for super super high res) but it's not supported. Bummer. And stop being such a ****, we know that you're playing retail games. Ok? So drop the charade.
I just don't really see the point in spending like two or three hundred dollars so you can download a few ROMs that you want to play on your N64. Just go to eBay and get the legit games, it'll cost you a lot less and be a lot easier than trying to go the pirate way.
And if you REALLY are trying to play demos...I don't think I have anything else to say to this thread.
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Dedicated to mediocrity and repetition since 1994.