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 v0.51:

[nervegas] Resync frameskip from preferences when loading saved game
[nervegas] Redraw controllers when debug toggled
[nervegas] Minor tweaks to portrait controller hot spots

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