What is a ROM image? For arcade games, a ROM image or file is a copy of all of the data inside a given chip on the arcade motherboard. For most consoles and handhelds, the individual chips are frequently (but not always) merged into a single file. As arcade machines are much more complicated in their design, you’ll typically need the data from a number of different chips on the board. Grouping all of the files from Puckman together will get you a ROM set of Puckman. An example ROM image would be the file pm1_prg1.6e stored in the Puckman ROM set. Parents, Clones, Splitting, and Merging As the MAME developers received their third or fourth revision of Pac-Man, with bugfixes and other code changes, they quickly discovered that nearly all of the board and chips were identical to the previously dumped version.

MAME 0.149 to 0.150 Update Pack: Atari 8-bit Family Set: MAME 0.197 to 0.198 Update Pack: Atari 5200 (Good5200 v2.01) MAME 0.143 to 0.144 Update Pack - Part 1: Atari 7800 (Good7800 v2.04) Amstrad CPC (GoodCPC v2.02) MAME 0.145 to 0.146 Update Pack: ZX Spectrum. Jul 13, 2016 - Complete zipped sets for all your favorite classic consoles. I wish there were ROM sets for MAME - I'm still downloading them individually.

In order to save space, MAME was adjusted to use a parent/clone set system. A given set, usually (but not necessarily) the most recent bugfixed World revision of a game, will be designated as the parent. All sets that use mostly the same chips (e.g. Japanese Puckman and USA/World Pac-Man) will be clones that contain only the changed data compared to the parent set. This typically comes up as an error message to the user when trying to run a Clone set without having the Parent set handy.

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Using the above example, trying to play the USA version of Pac-Man without having the PUCKMAN.ZIP parent set will result in an error message that there are missing files. Now we add the final pieces of the puzzle: non-merged, split, and merged sets. MAME is extremely versatile about where ROM data is located and is quite intelligent about looking for what it needs.

This allows us to do some magic with how we store these ROM sets to save further space. A non-merged set is one that contains absolutely everything necessary for a given game to run in one ZIP file.

This is ordinarily very space-inefficient, but is a good way to go if you want to have very few sets and want everything self-contained and easy to work with. We do not recommend this for most users. A split set is one where the parent set contains all of the normal data it should, and the clone sets contain only what has changed as compared to the parent set. This saves some space, but isn’t quite as efficient as A merged set takes the parent set and one or more clone sets and puts them all inside the parent set’s storage. For instance, if we combine the Puckman sets, Midway Pac-Man (USA) sets, and various other related official and bootleg sets all into PUCKMAN.ZIP, the result would be a merged set. A complete merged set with the parent and all clones uses less disk space than a split set.