I'm currently working on a SEGA GameGear Flash cart. I had been making several post under the discussion topic
"Do it yourself Gameboy Flashcart" but a group of us were doing allot of discussing and I figured it deserves it's own topic page.
So I will re-post a few of the images and key points to give you all a quick recap on this crazy endeavor that I've been working on.
The real issue here is verification of the actual pinout connection for the Stock issued ROM chips that are used in the actual Sega GG carts.
There are allot of different pinout diagrams around on the net, so it's hard to confirm as to the actual connections without any legit schematics
or Datasheets available. I think that is why there are very few DIY GG Flash carts around.
Shown below is one of the Pinout Diagrams I found online:
Below is the Cart scan of a standard Sega GAMEGEAR cart.
Many of us Backtrack the PCB trace lines using a standard GG cartridge along with these diagrams and then devise a possible
ROM Pinout scheme for the ROM contacts on the PCB. Yet, these connections are all based on the "Hobbyist" provided Cart Edge diagrams
which are questionable as to their accuracy.
I still have some issues with my GameGear? Flash cart but I'm not giving up.
Here is my Current Mess of Wires and Solder! UUGGgghhhhhrrrr!!
In the photo of my current cart (seen above) you can see the Red wires connected to pins 41 & 42 of the cart edge. These I have connected
to a jumper on the outside of the cartridge enclosure. When these two contacts are bridged or unbridged determines if the GameGear is in
a SMS or GameGear mode. There are a few Cartridge adapters for the GG that allow you to use SMS cartridges. So one could also use this
flash cart to play SMS Roms. All the more motivation to get this puppy running
****Still under testing****** Here is my latest updated "GameGear ROM Pinout & Cart Edge Connections Diagram" that I've come up with
and this is what I'm working on and still trying to get working. So by all means if you can see any errors or misshaps I'd love to trade research
with others working on similar Projects.
I look forward to hearing your replies,