They are the names of the main ELF files found on a PS2 game. In short, they're acronyms for SLUS: Sony Licence for US Systems SLES: Sony Licence for European Systems. Basically, SLES is PAL European, and SLUS is NTSC US and Canada (though Japan uses NTSC too, and their ELF's are SLPS, SLPM, SCAJ, PBPX and PCPX). US also sometimes uses SCUS.flapjack said:I noticed while looking at the compatibility list, some of the games were listed as playable for SLES ##### and some for SLUS##### what does this mean?
Pretty much, since PAL uses 50 FPS for their games and NTSC uses 60 FPS for their games. This is among other factors that can make some game of one region work, and the same game from a different region not work. Also, sometimes a different region game may be structured differently, which can also cause problems.flapjack said:Thanks! Is this why sometimes SLES and SLUS have better or worse compatibility on PCSX2?