Who better to tell the story of the FEZ Game-O CHIP-8 emulator, than the man who created it,
Ok, so he said a lot more than that but you can read all the details here, http://www.ghielectronics.com/community/forum/topic?id=14030.
CHIP-8 : http://en.wikipedia.org/wiki/CHIP-8
FEZ Game-O : http://www.ghielectronics.com/catalog/product/448
FEZ Game-O CHIP-8 Emulator : http://www.ghielectronics.com/community/codeshare/entry/826