I run my roms from a usb, and there’s an additional file to edit when running mame from usb, for example in addition to editing the es systems config for mame4all to point to your usb, you have to also edit
/opt/retropie/emulators/mame4all/mame.cfg
I’ve done it once before but I forgot what other file to edit for advmame, can anyone help me out with this?