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It's possible but requires more hardware hacking. The only accessible port on an unmodified Game Boy is the cartridge slot, which doesn't carry the video signa

It's possible but requires more hardware hacking. The only accessible port on an unmodified Game Boy is the cartridge slot, which doesn't carry the video signal. The point of this article is to use an unmodified console, which means you can only access what can be seen from the cartridge slot, which is activity on the memory/IO bus, and so this project recreates the video from that. To do what you propose, you'd have to open it up and add hardware hooked in to the connection that goes to the LCD. Someone's probably done that somewhere; it's a different scope than the project here.

anyfoo 4y ago
Now you made me think horrible thoughts: What if the signals to the LCD happen to be AC coupled into the cartridge pins enough that you can filter them out and reconstruct the image from it, at least with some level of fidelity. Probably not though. For starters, the interface to the LCD is most likely parallel, and you have to be really lucky for them to be discernible over unintentional coupling. For example, it could still work if the individual digital signals have slightly different phase and amplitude, in which case what you get from the cartridge pins is "just" quadrature amplitude modulated multiplexing of all pins. And you'd need some high quality test equipment to sample that...