Because the MAME developers are constantly improving the emulation, the way a game's ROM data is organized can change between versions. As a result, a ROM that works perfectly with one version of MAME may not function or may even crash when used with a newer (or older) version.
Disclaimer: This write-up is for educational and historical documentation of emulation software. Only use ROMs for games you legally own. Mame 0.159u2 Roms