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does this as well when using on server; using atlauncher. same specs as chrhasse. issue goes away when using blue pill, and reappears when taking red pill. restarted server and...

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This pitch looks like it has everything it needs for review. In the meantime, we'll keep this idea open for discussion so the community has the chance to provide feedback....

Savestate: [SLUS-21456 (7D13310A).01.p2s.zip](https://github.com/user-attachments/files/16741509/SLUS-21456.7D13310A.01.p2s.zip) It can be fixed by doing any of these: `disabling MTVU`, `underclocking the ee`, `positive VU1 rounding`,and `Delay VIF1 Stalls`.

"eeRoundMode: 0 # Fixes inability to enter door in Mission 18." in the gameindex is the reason. It needs to be chop/zero for this to work.

> This is one of the oldest known issues. It’s a floating point problem. This might be categorized in the never will be fixed pile. It will be fixed, but...

I've tested this on another emulator. The issue is solely with COP2's ADD/SUB.

> > I've tested this on another emulator. The issue is solely with COP2's ADD/SUB. > > Do you have a source for this? On Sony's PS4 emulator, the issue...

I ran some tests to compare the two emus on an arbitrary instruction: Driv3r SLUS-20587 002A83E4 4BC300E8 vadd.xyz vf03, vf00, vf03 `Instruction: vadd.xyz vf03, vf00, vf03 VF03 W Z Y...

@Goatman13 Which means it's either hacking the emulation or behaving in a way we're oblivious to. If you stick to your guns, then I wish you great luck uncovering why...