> On the downside, CHD v1 and v2 files are now unsupported, and CHD v3 and v4 no longer > have write support (support is for read only).
MAME only uses read only chds, the diff doesn't have to be the same version as the chd. I don't tend to keep the diff files, so I don't know if you can upgrade them.
I haven't upgraded the chd files.
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