: Many packs include MRA files , which tell the MiSTer how to build a specific arcade game from standard MAME ROMs on the fly.
: For arcade cores, packs often utilize specific versions of MAME ROM sets Mister Rom Packs
The short answer:
For PS1, Sega CD, and PC Engine CD, raw BIN/CUE files take up massive space. High-end MiSTer Rom Packs use (Compressed Hunks of Data). This lossless compression format saves 30-50% of space without impacting performance, which is critical since the MiSTer reads the entire disc image into RAM. : Many packs include MRA files , which
Unofficial packs from random Google Drives or torrents sometimes include corrupted files, incorrect file extensions, or (rarely) Windows executables disguised as ROMs. Only download from trusted sources (e.g., well-seeded archive.org collections with active comments). This lossless compression format saves 30-50% of space