Homebrew Need some help with putting emulators on my EZ4

[MegaMario]

Do I need to patch any files or something like that? I just wanted NES pretty much.

 

[FAST6191]

While there are a couple of nes emus about I can only really suggest nesDS:
http://www.cs.utah.edu/~tew/nesDS/
NesDS comes with an app called nesDS.exe which you can use to build roms, the original nesDS does not have save support (it will load a present save but nothing more). In short you can get away with copying the .ds.gba file to the memory card.
I have not got around to trying out the new modded version.
Modded version:
http://forums.maxconsole.net/showthread.php?t=25181
Downloads:
http://www.playeradvance.org/index.php?p=1 (curently about halfway down the page).

Other emulators either have builders or require you to use the copy /b command (I do not think any emu's access the EZ4's memory at this point) but in the future they probably will (a bunch of homebrew does).

 

[MegaMario]

Can any of the emulators out there save?