MAMEWorld Forums - EmuChat - Re: Can't Run Willow

And for the record, it's might be these that you're missing:

"buf1" size="279" crc="eb122de7"
"ioa1" size="279" crc="59c7ee3b"
"prg1" size="279" crc="f1129744"
"rom1" size="279" crc="41dc73b9"
"sou1" size="279" crc="84f4b2fe"
"wl24b.1a" size="279" crc="7101cdf1"
"lwio.11e" size="279" crc="ad52b90c"

They're dumps of the programmable logic devices that were used on the arcade boards to determine how memory and the video chips were accessed, among other things.

ROM sets can and do change between versions due to bad dumps being corrected or undumped chips subsequently becoming dumped. In this case it's the latter. While the Capcom CPS-1 driver does not currently make use of the data on these chips, it's important and desirable to have this data documented in MAME, because it largely exists as accurate hardware documentation that people can - and do - use for repairing their own arcade boards that have developed faulty ROMs or programmable devices. Previously MAME was largely limited to only preserving ROM dumps, but there has been a general push towards including the data from other programmable devices on the boards as well.

As there are plenty of torrent sites out there that provide torrents of up-to-date complete ROM sets, having this data documented in MAME effectively incentivizes the duplication of said data, ensuring that it won't be lost in a historical void as things have in the past. Unfortunately for you, the MAMEWorld forums disallow explicit posting of direct ROM links due to the fact that forums have in fact been targeted in the past for copyright violations due solely to content linked on them. About the most anyone can tell you is that if you're looking to download individual ROM sets, you're out of luck, your best bet is a torrent site. Any decent torrent software will even allow you to select just the individual files in the torrent that you want, so you won't even have to download the whole multiple-tens-of-gigabytes-sized full MAME ROM set.