The site has possibly been hacked that's allI'm not willing to disable my antivirus software to find out though
Your not the only one to find MAME difficult to find the roms for but asides from that it's not hard at all to use especially if you use a GUI version like MameUI or one of the many online gaming versions, just about any version that is not the officially distributed version, that are all built on the same source files anyway.
I have full 0.152 set for MAME
Some games do run better in other emulators though due to hacks and various other tricks to get full speed but MAME is more for accuracy so does not use the same tricks, most other arcade emulators still use MAME source as a basis but they alter/add to the code to improve performance but the accuracy is lost through this, from gamers point of view that should not matter so much though
Sites like http://nonmame.retrogames.com/ list alt emulators that can be used that will play some of the games better or emulate games that are not emulated with MAME
Emulators such as FBA and plenty of others tend to be limited to certain games but MAME on the other hand covers alot more systems in general though some are yet to be fully emulated or may be slow but even if you just count what is fully emulated with MAME that is still more than double what any other emulators can play
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