Eh. No luck. I've never used Mame on Switch-Retroarch.
I have the CHD file for both Gauntdl/Gauntdl24 as well as the .Bin files.
Gauntdl.bin and vegassio.bin
Ive tried loading both CHD and BIN, but it is just a black screen. The BIN files won't let me select any MAME core, the CHD only shows I can use Mame2000 or 2003 Core, forgot which.
Do I need a BIOS for RetroArch Mame? I can get 2 dozen other cores to run fine, except this one.