XRoar reads a ROM by name from the directories of rompath. The entries
take their file name as path, relative to ~/.xroar/roms or
${prefix}/share/xroar/roms, and rompath and -rompath are declared as
search lists.
Batocera records its rompath line, Recalbox -rompath bios/<system>
(the placeholder its extractor already writes), RetroBat its -rompath
as two records, bios/dragon and bios/coco for coco. An entry whose
name the platform list does not declare follows the launch its
profile system is listed under: Recalbox lists mc10.rom under
trs80coco, so alice.rom is read there.
Batocera ROMs move from the BIOS root to bios/xroar, Recalbox ROMs to
bios/dragon and bios/trs80coco, RetroBat ROMs to bios/dragon and
bios/coco. RetroDECK and RetroPie keep them at the BIOS root.