Welcome!

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=_lre8pw6JFU

I'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?

I don't think nebula ever released its source code ? Or actually wasn't it supposed to have been incorporated in MAME ?
As for screenshots, i think we are good since we have pcb videos.
The answer probably is in https://github.com/jotego/jtcores/blob/master/cores/cps2/hdl/jtcps2_raster.v, but i don't understand much about vhdl language

Sound👍

@dink: how u doing, I don?t know if you are aware of this in relation to the Shuma gorath raster effect from Marvel super heroes but as far as I know only one author got it right and did it correctly or shall I say accurately and that is the old nebula emulator from elsemi, you may want to look into it if your still interested in solving this old mystery for fbneo and I don?t think jotego ever got back to you about this either? I would?ve provided some screenshots but unfortunately my puter is fried..

This alone was the MYTH in the Games Room!!!

Hmm, I will look into that sometime, just taking a little break from things

best regards,
- dink