Arcade emulation requires exact matching between your emulator version and your ROM set. For MAME 2003-Plus, you need the specific MAME 2003-Plus reference set. Key Archive Search Terms

Dozens of games that used to freeze, crash, or suffer from severe frame drops under standard MAME 0.78 run flawlessly in the Plus architecture. This includes optimizations for fighting games, vertical shoot-'em-ups (shmups), and classic beat-'em-ups. How to Set Up and Verify Your Archive

. It is based on the MAME 0.78 codebase but includes modern backports, bug fixes, and expanded game support. Core Features and Improvements

MAME 2003 Plus requires a – generally MAME 0.78 (2003) merged or non-merged sets , but with some updated ROMs from later versions to fix known issues.

MAME 2003-Plus is an updated version of the classic codebase. While the original 2003 core stopped evolving years ago, the "Plus" version is actively maintained by the Libretro team.

Even within a "hot" archive, you might hit errors. Here is the fix: