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Do ROMs get "old", and not work well with newer versions of MAME?

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Mugzilla:

If I had a set of 0.74 ROMs, and when I used them with the latest MAME, why would they work slower, crash, some not even start up, etc?  I was under the impression that a ROM is a ROM is a ROM, and they would work with any version of MAME?

richms:

no, they are packed differently as mame evolves - there is a good tutorial on using clrmamepro if you google for it which will sort the roms out based on the dat file made by your current version of mame.

vertygo:

the mame release page http://mamedev.org/release.html has a what's new link, that gives you a pretty good idea about how things change all the time. Bug fixes, new decryption, etc.

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