http://blazeretro.com/   I saw this handheld and bought it without thinking too much, I didn't have high expectations but it still intrigued me since recently the market is offering some good quality handhelds. So, coming to the point, it's really possible to add 7800 games via SD but unfortunately some games don't work (including games that use POKEY) and games that work run too fast. Also TIA sounds bad, difficulty switches are not included and some color is wrong (for exampl