This rare variant of the Wiii3 with an additional 7-games cartridge is one of the few places their 16-bit Sunplus games are known to have seen release (not my pic but this is the same model I have) and these videos are me finally finishing the job of capturing footage from it
OK SO I found this program where someone has actually implemented multiboot and enough of the xboo communicator protocol to do everything i need, but with a Raspberry Pi
https://github.com/akkera102/gba_01_multiboot
SO I attempted to modify it to communicate over parallel instead and it just WORKED!?!?!?
It is dog ass slow compared to the original communicator so I probably need to tweak some delays and stuff but i'm so glad this worked oh my god