: MAME romsets change over time as more accurate dumps of arcade boards are made. A game that worked in version 0.134 might not work in version 0.287 because the file structure or specific chips needed for emulation have been updated.
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For shoot 'em up (shmup) fans, 0.134u4 was a watershed moment. The update specifically fixed timing issues for games (like DoDonPachi DaiOuJou and Espgaluda ). Prior versions had terrible input lag; later versions introduced "perfect" emulation that required high-end PCs. Version 0.134u4 hit the sweet spot of playable accuracy on a Pentium 4 or Core 2 Duo. : MAME romsets change over time as more