Hi, I wanted to share my solution to boot on the unibios by default (and not having to switch bios by the mame menu). This seems to work fine with mame 2014. I unzipped my neogeo.zip and renamed the uni-bios-3_1.rom in sp-s2.sp1 I now have a warning message (that some rom may be incorrect) but I start on unibios. It seems to work fine.
In fact, I just keep these 4 files in my neogeo.zip: 000-lo.lo sfix.sfix sm1.sm1 sp-s2.sp1 (renamed from the uni-bios-3.1) The unibios has everything I need. (A+B+C) at the start to select a new region/version and (start+select) when in game
It needs more testing to see if it’s completely reliable, but it seems to work fine for now.
I tried this trick: "With the Mame 2015 core you put a text file you name neogeo.ini with:
bios unibios31
In RetroArch\system\mame\ini folder." but it doesn’t work for me
Edit: To make the neogeo.ini taken into account, you need to hit F1 while i game then Core Options>read configuration: enabled no need then to create a new neogeo.zip bios