Just a reminder that providing specifics on, sharing links to, or naming websites where ROMs can be accessed is against the rules. If your post has any of this information it will be removed.
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Try make a 1GB game first :v
If you wan't to crypt your game with the basic stuff, it's 128MB or 4GB (the max you can get with x86 apps). If you do not crypt your game, you don't care because you usualy don't read all files at once.