So if you load King Of Fighters Battle De Paradise (a Neo Geo Pocket Color game) into a NON-colour Neo Geo Pocket, you get a secret hidden game instead - an obscure lost arcade game called Yosaku.
https://www.youtube.com/watch?v=_lre8pw6JFUI'm doing a little research on Yosaku, so I thought I'd see if I could play it on an emulator (I use Retroarch). I tried BeetleNGP, but whether you give the file an .NGP or .NGC suffix the emulator treats it as a Color game and just loads KoF:BdP, and there are no settings that let you force-choose the hardware.
So I tried the Retroarch version of FBNeoNGP, but it did the same and also has no hardware settings that I can find. So I thought I'd try to fool it by renaming the mono BIOS file as the Color one and running it via the Patched folder. That seems to ALMOST work - as far as I can tell from the sound it's starting Yosaku, but the screen is completely black.
Is there anything I can do to get it to work properly?