This was posted in the General Discussion Thread and I thought it would be good for this section as well.
Quote:
Originally Posted by joshysquashy
For the NDS, there are slot1 cards, and slot2 cards. The cycloDS is a slot 1 solution, and is very good (I have it). In order to play GBA games, you also need a 3-in-1 card for slot 2, costing $20.
But you don't need that for what you want.
Here is a link to a list of Emulators that run from slot 1. Enjoy!