A is a massive collection of these game files compiled to match a specific version of the MAME emulator. Because MAME is updated frequently (e.g., version 0.139, 0.229, etc.), the ROMs must match the emulator version. If you try to run a ROM designed for MAME 0.200 on a MAME 0.139 emulator, it likely won’t work.
ROMs exist in a legal grey area. Technically, you are only legally entitled to use a ROM if you own the physical arcade PCB (circuit board) or have created the backup yourself. However, downloading packs is the standard way the preservation community keeps these games alive. Best Mame Roms Pack Download
Even with the best pack, you might see issues: A is a massive collection of these game
In this guide, we’ll break down where to find the best packs, the difference between "Split" and "Merged" sets, and how to ensure they actually work. ROMs exist in a legal grey area