The classic Konami side-scrolling beat 'em up, perfect for multiplayer. Double Dragon (1987): The genre-defining beat 'em up. Classic Classics
Fundamental, fast-paced action. Robotron: 2084: The ultimate dual-joystick shooter.
: pacman.zip will contain the files for the original US version, the Japanese version ( Puck Man ), bootlegs, and hacks altogether.
Here is a comprehensive guide to understanding MAME 0.144 ROMs, why this specific version matters, and how to manage your classic arcade library. The Architecture of MAME: Why Versions Matter
As the MAME development team discovers better ways to dump these chips, or finds chips that were previously missing from a game board, they update the source code. Consequently, the files required to run that game change.