Ok @ItsBobDudes sent me over his working set. I am out of town so sadly I can't test, but I'm realizing that MiSTer uses the merged set. My bad! I think I just installed it on mine manually, but download-all pulls down the main rom and then the variants in separate subfolders.
I think this will work for you and @Mrhide then.
Download this new zip. Extract it and put the MRA into "/media/fat/_Arcade" folder.
Then you need to build a dedicated, separate ddonpach(campaign).zip file (named 'ddonpach(campaign).zip' to match this MRA file). You may have to consolidate some files from the different folders, but it's basically the patched u62, u27, u7, and u6, plus all the other standard files. That all needs to be zipped up. Here's what it looks like on my computer, you can see from the datestamps that the top 4 files were modified. (probably b1.u27 and b2.u26 are not required but this is what @ItsBobDudes tested as working)
That resulting ddonpach(campaign).zip goes in /media/fat/games/mame
Anyway sorry for the hiccup. This is very helpful so I get the actual release right though!
From your list of files, b1.u27 et b2.u26 wasn't in my zip: it's not in the J or the Arrange zip but is in the main ddp zip. I've added them and ok that works!
now I need to remove these 2 files and try again! be right back.
edit: back and it still works without b1.u27 and b2.u26. These files appear to NOT be needed then and that DoDonPachi (C).mra from @itBobDudes is all that's needed
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