The MAME 2014 reference set corresponds to MAME version (released 2014). It’s a curated snapshot used for preserving and emulating arcade software as it existed for that MAME release. The set typically includes ROM images and optional CHD (Compressed Hunks of Data) files for large media (CDs, hard-drive games).
Pro tip: Look for DAT files ( .dat ) to verify your set against the official MAME 0.159 XML. Tools like or RomVault will audit and fix your collection. mame 2014 reference set mame 0159 roms chds top
If you’re using RetroArch: