PCSX2 SVN r4938 is released. PCSX2 is an open source 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.

PCSX2 SVN Changelog:
r4934
EERec: Small changes so Constant Propagation can be turned off (for testing purposes)
r4935
COP2: Fix/hack for Ace Combat 4 sky, you will need to tick the VU Flag Hack Speedhack to enable it (not sure what else to put it on without adding another hack). This is more likely to do with odd COP2/VU0 sharing pipe behaviour, but ill leave that for cotton :P

Also altered some of the interpreter calls so the defines in config.h can be used again (example the #define ARITHMETICIMM)
r4936
Partial revert of r4935. REC_FUNC_DEL is functionally distinct from REC_FUNC. Fixed REC_FUNC_DEL definition.
r4937
mVU: Typo in CTC2 macro mode instruction for the status register case.
(Untested, unknown what if anything it fixes, possibly ace combat series but probably not.)
r4938
Removed Ace Combat hack as r4937 seems to have solved the problem.

Download: PCSX2 SVN r4938
Source: Here