Here's the insides of that cart that I found:
I censored parts of it because of obvious reasons. I'd rather we be able to still get these unique carts.
1) See the left half of the first picture? That sucker is just a BGA adapter - in theory you can program it using an overhead pin adapter pressed against it! This means that we don't even need to know the programming method, if any, that the ASIC uses. In fact, you could replace that with a socket.
2) The back in the second part shows how professional the circuit board is. Those are very well-made lines and holes. The layout isn't too bad, either.
3) Some other views of the Flash memory and also the EPOXIED (!) chip on the board. Reminds me of the old Sharp carts on the NES/SNES.
I didn't include the wire-routing list for that wire-wrapped daughterboard because A) didn't remember B) it's pretty basic if you follow the GMB/GBC docs. All of about 20 wires. The glue has some added advantages. It insulates to avoid static/power rail discharges and shorts. It protects the wires from getting pulled out. It protects your freaking hand from those sharp pins(ouch!). It also keeps the solder from corroding - your hands are covered in salt and acids.
The BGA chip seems to be a 128Mb Flash ROM and 16Mb PSRAM all in one package. There are companies putting multiple chips on one IC carrier, nowadays. In theory, you could use this on a DS but mine is waiting on a cable before I can test it out with GBExploader or such. Annoying: EZFA and eCube software won't detect the saved game memory.
