How to patch a non VGA game to VGA:
Open the 1ST_READ.bin/main binary with a hex editor and search for "JUE" if it finds the correct position there is a 7 number string 5 bytes after it (if not use find next also you might want to use a match case search), change that string to "0799A10"
You will have to bin hack the 1ST_READ/main binary after changing any values to make it self bootable again
Hope this helps, worked for me with Dino Crisis. Don't know if Seven Mansions is one of the few games that won't work even when patched...
Hope your talking about SGGG/Segagaga!!! Works for me with DEMUL so probably not...
Seven Mansions is one of the few Dreamcast Games that won't work when patched, which is infuriating
And no, I wasn't referring to Segagaga. Though isn't someone else working on that project?
Should be quite easy using Xdelta GUI. Take an example of this Youtube video (its a NDS game but will work with any file).https://www.youtube.com/watch?v=Gz9-EfJrxJ0
Just need the original image and the edited one. Then you can distribute the patch but you have to say which release is your original image (still, could be improved but seems more elegant, isn't it)
Though the download link in that video is to one that works with only NDS files, I found a version of the program that should be able to create and apply patches to most file formats. I'll test it and get back to you. Aleron Ives
brings up a lot of good points however, the file size will be large and it might be easier to just provide all the modified files in an archive so that users can swap/copy and paste over their originals.***UPDATE***
- As Aleron Ives
predicted, the patch file size is large as it's over 200mb. For the best convenience, if users already had a CDI version of the original game (such as Echelon's DOA2 Limited Edition CDI file for instance) they *could* apply the patch to it and get themselves the modded game. I do feel users would much rather download the fully modded game versus downloading the large patch file and then applying it to the CDI image. But, the option is there for people who genuinely want it. If so, I could zip the patch and Xdelta into an archive and upload it online as an alternative.