The gold standard for emulation. It compresses the game significantly while keeping it as a single file. Supported by RetroArch and DuckStation .
There are many "highly compressed" formats floating around (like Ps1 Roms Highly Compressed
You lose authenticity. Music may sound tinny, cutscenes may look blocky, and some emulators may crash when the compressed audio fails to sync. The gold standard for emulation
Section 1201 of the DMCA allows circumvention for preservation by libraries/archives, but not for general distribution. Highly compressed ROMs exist in a legal gray zone, though sites hosting them regularly face takedowns. cutscenes may look blocky