One thing I’ve found when playing emulated NES, SNES, and GBA games is that many of them are incredibly long, and for no good reason. For example: Dragon Warrior. Great game. Unfortunately, the slow movement speed and slow battle dialogues make the game about twice as long as it should be. My solution? Run the emulator at 200% 
speed. I was looking forward to getting a DS and playing GBA carts on it, but I lamented that I’d have to play games at the speed of a mere mortal.
No longer! The XCM Hyper Gear case will allow you to play games at 140%, 180%, and 66% speed. I’m pretty sure there are consequences they’re not telling us about, such as really bad battery life or perhaps heat problems, but I don’t really care; if I get myself a Lite (forget the DSi) I’m getting one of these things as well.
[via Techabob]
Very cool. Looks like a good idea to make some of the slower games on the DS a little more fun to play.
the nes emu on the ds has a forward and reverse speed up you can fast forward or reverse (if you die you can play back time) this would be a risk of shortening the life of the system,