> > MAME only uses read only chds, the diff doesn't have to be the same version as the > > chd. > > Incorrect. There's a very misleading error message that appears when you try, which > was quite common in the immediate aftermath of the v5 upgrade.
AFAIK the error message was because the diff wasn't v5, not because the diff had to be the same as the chd. Yes the error message was confusing.
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