MAME's search path for a set is the set and every ancestor
(src/emu/driver.cpp:31-38, src/emu/romload.cpp:67-84 at mame0289), so
a clone reads the ROMs it shares with its parent from the parent's
archive. games/arcade/<profile>.json now records, under parents, each
parent game set with ROMs and the clones whose romof chain reaches it
before any BIOS set, and rom_search_sets adds them to what a command
reads. The installer's index leaves them out, as it does the sources.
arcade_parent_importer --all is re-run: every profile gains parents,
and mame0258, mame0278, mame2010, mame2015, mame2016 and fbneo also
gain the sources their committed files lacked.
Manifests, EmuDeck and RetroDECK only: videopac.zip reaches
roms/odyssey2 beside i8244.zip, electron.zip roms/electron, and the 35 parent
sets the profile holds (a7800, apple2e, intv, videopac and others)
reach arcade, consolearcade and mame, the folders whose command starts
any machine. verify --all keeps its severity and status counts.
mame2000, mame2003 and mame2003-plus carry a DAT their code moved past. Their parents and BIOS sets now come from src/driver.c and src/drivers/ at the pin, named by the src tree sha. The DAT is still read to report gaps. FBNeo DATs are read one namespace each, console sets keyed by driver. A BIOS with no dumped ROM is no longer listed.
The games index now names, per arcade core, the game sets that load no
BIOS set and every BIOS set, so a set on a card the DAT does not know is
told apart from one that needs nothing. Each board default core of a rom
folder gets its own fallback set, and index.json maps every folder name
a setup uses to its systems, for a games folder on a computer.
Abdessamad Derraz