DSx86 is a PC emulator for Nintendo DS. It’s purpose is to allow you to run old DOS games on your Nintendo DS game console.

Release notes:

Version 0.03 Alpha. Pretty much everything in it is still temporary or unfinished, but feel free to test it and report all problems you find! See the release notes!

Discussion: http://forum.gbadev.org/viewtopic.php?t=16956