> > I understand only having officially produced rom sets in MAME but if rom sets like
> > Outrun Enhanced Edition and Metal Slug 2 turbo are supported in MAME then why not
> > this Strider hack?
> The (flimsy) justification is that they've been encountered on boards people are
> selling. I frankly feel that they should be in HBMAME.
For Outrun it's more a case that the version is the version that most modern arcades are running because it supports freeplay properly while the old version did not (attract doesn't play properly, bad for the screens etc.)
Since a lot of modern places operate on a 'pay on entry, games are on freeplay' business model they end up using that version. This means that 20 years down the line, if somebody dumps those PCBs they'll have that version on, so it makes sense to document it rather than trying to document it in 20 years when information about what it is might have been lost. (and documenting it in HBMAME I don't think would be as effective, MAME is likely to be preserved with time, HBMAME might drop off the face of the earth, especially if the author keeps violating the GPL every time he feels like it) People seem to think that once something is on the Internet it's there forever, but for stuff few people care about that simply isn't true.
For Metal Slug, yeah, the usual scummy NeoGeo bootleggers started selling it as soon as it was made.
Overall they fit with the arcade side MAME's philosophy in documenting what ended up in arcades anyway, if anything the OutRun one shows how the arcade scene changed from back then to how it is now.
The Strider hack is more pointless and can go in HBMAME for all I care, very unlikely any significant number of people are going to be putting it on PCBs.