Youtuber that also sells modchips, arcade game parts, cartridge mods, and will also repair and mod consoles for you.
It looks like he's got mods for the SNES, N64, PC Engine, Turbografix, and the NES.
Someone fed ROM dumps from a couple of Atari games into distellamap and generated maps of function calls, with sprite dumps. Amazing, how simple games were back then...