You guys have the region thing all wrong. I was not incorrect in what I said.
American games have region lockout code that executes before the game is booted.
ONLY AMERICAN GAMES HAVE THIS CODE. By "code" I mean a microprogram or subroutine, whatever. IIRC it was up to the developer to implement this code to comply with Hudson/NEC's policies. There is at least one US cart that doesn't have this code (Night Creatures I think) and that cart will play on a Japanese system. This code checks a condition on the CPU that is only present in Japanese hardware. You can trick the lockout code into thinking the condition does not exist by grounding a pin on the CPU of the Japanese console. This has nasty side effects that break certain games as well as break the ability to use a flash cart.
There is nothing going on in the hardware itself with regards to region protection other than the swapped cartridge port pin layout; it's all in the ROMs.
Therefor, I can play Japanese ROMs all day long on my US system using a flash cart regardless of what region the cart is set to (although if it's set to JP I'll need a Kisado to use it on my US console). This is because Japanese games don't have a lockout routine checking anything. American ROMs will
only ever be playable on my American system, regardless of whether or not I swap the pinout to be JP-correct because of the routine that checks for the presence of a Japanese CPU
is part of the ROM itself.
Make sense?
So, I was looking at one of these, are they really that good? I am looking at the idea of playing some fan translated stuff, but would I still need an adapter for a US system?
T2KFreeker, the flash cart will work absolutely great for what you want it for-- no adapter required. That's precisely the reason I got mine and it works like a dream on my US TurboDuo.