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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
This core option was added in mame and mame2016 to avoid having to do that through mame osd (which didn't save between boots either), and i think you are right about the mame version not working properly. It doesn't surprise me, i remember helping that contributor with a few tips on retropie forum, he wanted this feature for playing cv1k games with mame2016 on his pi4, he probably never tested it thoroughly with mame.
This core option was added in mame and mame2016 to avoid having to do that through mame osd (which didn't save between boots either), and i think you are right about the mame version not working properly. It doesn't surprise me, i remember helping that contributor with a few tips on retropie forum, he wanted this feature for playing cv1k games with mame2016 on his pi4, he probably never tested it thoroughly with mame.