PCSX2 is a PlayStation 2 (PS2) emulator for the Microsoft Windows and Linux operating systems. With the most recent versions, many PS2 games are playable (although speed limitations have made play-to-completion tests for many games impractical), and several games are claimed to have full functionality.The main bottleneck in PS2 emulation is emulating the multi-core PS2 on PC x86 architecture. Although each CPU can be emulated well, getting the synchronization and timing between them to be accurate is very difficult.PCSX2, like its predecessor project PCSX, is based on a plugin architecture, separating several functions from the core emulator. These are the graphics, controls, CD/DVD drive, USB, sound and FireWire ports. Different plugins may produce different results in both compatibility and performance. Additionally, PCSX2 requires a copy of the PS2 BIOS to operate, which is not offered for download by the developer, due to the copyright concerns and legal issues associated with it. A free clone of the official BIOS is in development.
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