> OK, so the parent set is an earlier release, right? > > From what I'm seeing, MAME doesn't use early versions as parent sets (examples here), > unless they're the only one available (like barata). > > Also, in most cases the latest revisions of a game are used as parent sets - > excluding obviously unofficial releases (hacks, bootlegs, Phoenix editions, etc). > > MAME seems very consistent with these rules, so I think exzisusa should be changed as > the parent set, if it's confirmed as later than exzisus.
MAME is anything but consistent, in this case I think the older set remains as the parent because it's the dedicated version, the proper version of the game, while the others are conversion kits.
See buggyboy (1985) as a parent of buggyboyjr (1986) for another example of this.
the only real policy is 'whatever the dev who worked on it feels is best' with some rough guidelines to help make that decision.
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