Custom ROM for Sup Game Box 400-in-1

What is it inside??

I have torn down these things and I found:

• BL-5C battery. Best to take it out when not playing it! And best don’t leave it alone when charging it!

• TFT screen module. Sticking this thing into a FPC converter, Arduino and the Arduino sketch it shows that it is a GC9306. This is found on the handhelds that are bought in 2020. After that year, by using the same technique, it does not report this model number anymore. However, swapping the screen on another Sup 400-in-1 that are bought in a different year normally works too. (Note: Your mileage may vary on this!!)

• BGA Flash Carrier. The NOR flash are usually Samsung K5L2731CAM-D770, “Unknown Model” V00670002ADGB and ST M36L0T705. They are 16 megabytes of size. These sit on top of a breakout board that is then soldered onto the unit’s PCB. Extracting this thing out is a painful and very error-prone process. I recommend a ChipQuik to do so for ROM dumping. Suggestions are welcome to extract this with a lower cost! Please refer to the “How to Dump its ROM” for more information.

• TSOP56 NOR Flash. These NOR flash are usually S29GL128 or S29GL256. These ones are easier to remove by hot air, but you need a T56 Programmer to dump and reflash it. Also, the pads on these board are very flimsy and very prone to lifting if you put the hot air on it too long!

• Black blob. Well, we are stuck here of course, unless if someone curious could expose the die and have it examined in a microscope. Exploring the forums such as BGC Forums and NesDev Forums it is highly suspected that this is a Nintendo-on-a-Chip (NOAC) with OneBus to accomodate 16-bit data parallel flash.