This database can be integrated in MiSTer FPGA by editing the downloader.ini
file at the root of the SD.
To integrate it in a MiSTer device, add the following section to the end of to the file downloader.ini
that should be placed at the root of the SD (if it doesn't exist, you may create it for this purpose):
[misteraddons/mistercade_freeplay_mappings]
db_url = https://raw.githubusercontent.com/misteraddons/mistercade_freeplay_mappings/db/db.json.zip
After that, run downloader or update_all as usual. It will try to fetch the files from your newly created database.
If you want to try the normal mapping repository (no freeplay), go here: https://github.com/misteraddons/mistercade_mappings