Explain The Symbols In Rom Lists To Me


spray

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i've acquired a full set of neo geo pocket roms

along with the name of the rom, each file contains what i'm guessing to be some form of language/region thing (UEJ) etc

also where there are duplicate roms, they are suffixed with a !, a1, h1 etc.

what do these symbols mean? i'm looking to just get a repeat free full set of roms, which of the duplicates should i delete?

cheers
 
In general I always delete the alternate and hack versions, leaving only the [!] clean dumps. Is this correct or is it usually better to keep the latest hack version?
 
Hack proof can sometimes be better, as if the original game had slowdown, or there was a glitch that could be fixed by a hacking group, but most of the time its just a release group intro.
 
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