if you need to test PS2 games they would more than likely give you a PS3 and PS2 (cross-compatability checking) it takes ages for games to be made properly playable on the PCSX2 emulator and you need a PC worth about $600-$800 from an American store to play them atleast, and then probably add in a better graphics card, too.
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So a BIOS won't actually effect the performance of an emulator, the problem is the engine, it's hard to perfect an engine that is not exactly the same as the actual hardware it's meant to mimic.
PS2's can be had used for $50 which is a lot cheaper than paying $600 for a PC and having to wait months after to actually play the games. The want for PS2 testers is obviously long gone since it is SEVEN YEARS OLD and alot of the games they already have the people who developed them testing them now, they mainly want other people's opinions for button layouts and story and you need qualifications for that.
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