NES.app uses the popular InfoNES emulation core to mimic the 6502 processor in a Nintendo Entertainment System, allowing you to play ROM dumps of games designed for the NES console. ROM dumps are files containing the dumped instruction code from a physical cartridge.

Changes since v0.54:

[nervegas] Minor speedups for game genie
[nervegas] Fixed bugs related to preferences being reset (Occured if the preference had not been drawn when exited)
[nervegas] Replaced “All Games / Saved Games” button with disclosure
[nervegas] Sped up preferences scrolling by precaching values
[nervegas] Refresh “Saved Games” browser when new game is saved
[nervegas] Implemented “true” multitouch using gesture API, fixed issues
[nervegas] Removed diagonl direction hotspots, made controls harder

http://iphone.natetrue.com/nesapp/