Hi guys I'm having a similar problem with demul,I've set all parameters as is in this post even tried individual launch atomiswave rom paths but all that happens is demul flashes on screen for a second then nothing.
I have naomi booting fine...
Only thing is I have separated atomiswave roms to a seperate folder but did notice when I look at my naomi scrape that it has atomiswave in there also.would this confuse it? can I have both naomi in same roms folder and just use a separate platform and delete the none atomiswave from the platform?
I've checked and double checked all bios is there & paramiters are as should be etc , they boot in demul as a standalone (using 0.57 btw)