Please let me know about the files in "CHDs" directory at the "MAME" Download directory.
There, CHDs that are not included in each MAME UPDATE folder are often updated.
Recently, "popnanm2" and "mj1" have been updated, but they are not included in the "MAME0.272 UPDATE".
Also, many of them were updated this spring.
For example, "bmiidxc2", "bmiidx", "bm3rdmix", "ddrsna", "ddrsn2u", "ddrsn2j", "timetrv" "maquinati" etc...
Why Updated? Are they dumps from before MAME was compatible? And When MAME is compatible, will the same ones be included in the UPDATE folder at that time?
I'm a beginner, sorry...