To understand the "new release" aspect, we have to travel back in time. MAME 0.134u4 was released in late 2009/early 2010. The "u" stands for "u" update or "WIP" (Work In Progress) . These were monthly syncs between major numbered releases.
: Easy to move individual games around; deleting one game won't break another. new release mame 0134u4 rom work
If you want, tell me which game(s) produce errors and paste the verbatim mame console error output and I’ll give exact fixes. To understand the "new release" aspect, we have
The release of MAME 0134u4 marks another step toward perfect arcade emulation. While it may require you to update your ROM sets, the improved accuracy is usually worth the effort. By using proper ROM management tools and ensuring you have the correct data for this specific version, you can keep your favorite arcade games running smoothly. These were monthly syncs between major numbered releases
Understanding the New Release: MAME 0.134u4 ROM Work and Compatibility