MAME is a constantly evolving project. Every month, the development team updates the source code. Sometimes they add support for new games, but often they "fix" existing games by changing how the ROMs are loaded. This means that a ROM that worked perfectly in MAME version 0.100 might be "broken" or unrecognized in MAME version 0.200.
MAME 0.139 was the major release. Shortly after, an incremental update patch was released: 0.139u1.
Many beginners make the mistake of downloading a "MAME ROMs" pack from a random website and trying to load it into a specific version of MAME, only to be met with error messages like "files missing."
This happens because MAME is obsessive about accuracy. If a game manufacturer released a revision of a chip (say, "pacman.zip"), MAME demands that you have that exact chip dump. If the MAME developers find a better dump of that chip in version 0.150, they change the required file name or checksum.
The "u1" Designation You might see "0.139" and "0.139u1" used interchangeably, but there is a slight difference. The "u" stands for "update."
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