==ROMs==
Just as in MAME, some MESS ROMs have parent ROMs that also need to be installed. E.g., <tt>cpc6128.zip</tt> also requires <tt>cpc464.zip</tt> to run.(See the links section for CPC ROM files.)
ROMs often only work with a specific version of MESS. This does not seem to affect CPC ROMs, but other systems sometimes give an error message when ROM filenames or checksums do not match what MESS expected.