Emulator

Game Name?

Metal Gear Solid: The Twin Snakes

Game ID? (right click the game in the game list, Properties, Info tab)

GGSEA4

MD5 Hash? (right click the game in the game list, Properties, Verify tab, Verify Integrity button)

0720e3d3fe42587b2ce22fbb8a60b847

What's the problem? Describe what went wrong.

In the 2nd fight with Vulcan Raven, the game routinely crashes, it gives this error message:

IntCPU: Unknown Instruction 00010001 at PC = 7f05fb1c last_PC = 812fffc8 LR = 7f05f9b4

Condition: 0
File d:\Source\Core\Core\PowerPC\Interpreter\Interpreter.cpp
Line: 315
Function: unknown_instruction

What steps will reproduce the problem?

With no cheats enabled, I load my save at the 2nd Vulcan Raven boss battle, with the bandana equipped. I move down and to the right to the last shipping container to the safespot where Raven can't damage you, I go prone, and as soon as I scope in and/or when Vulcan Raven is alerted to me, I get the error message. This happens regardless of which weapon is equipped, it also happens regardless of whether the bandana is equipped.

The error doesn't occur if I run down and the left, with the bandana equipped and attack him with the Nikita, M9, FAMAS, or SOCOM. The error does occur if I do this and then move right, out of his cone of vision.

The error occurs if I, WITHOUT the bandana equipped, move down and the right to the bottom right corner of the map, turn around, lay prone with the PSG1-T, and begin firing at Raven. Raven walks forward a few times, then turns towards the center of the map, and the error occurs.

If I do nothing (I start the fight with the bandana and Nikita equipped), the error occurs when Raven turns the corner and is alerted to me.

If I avoid Raven, the error occurs within ~10 seconds of loading in, even if I do nothing except move. If I do nothing but avoid Raven and unequip both my items, the error occurs.

Is the issue present in the latest development version? For future reference, please also write down the version number of the latest development version.

Yes, it is present in Dolphin 2509-140

Is the issue present in the latest release? For future reference, please also write down the version number of the latest release.

Yes, it is present in Dolphin 2509

What are your PC specifications? (CPU, GPU, Operating System, more)

NVIDIA system information report created on: 10/06/2025 15:28:11
NVIDIA App version: 11.0.5.266
Operating system: Microsoft Windows 10 Home, Version 10.0.19045
DirectX runtime version: DirectX 12
Driver: Game Ready Driver - 581.42 - Tue Sep 30, 2025
CPU: Intel(R) Core(TM) i3-10100F CPU @ 3.60GHz
RAM: 16.0 GB
Storage (3): SSD - 931.5 GB,HDD - 3.6 TB,+1 more

Graphics card
GPU: NVIDIA GeForce RTX 3060
Direct3D feature level: 12_1
CUDA cores: 3584
Graphics clock: 1807 MHz
Resizable BAR: No
Memory data rate: 15.00 Gbps
Memory interface: 192-bit
Memory bandwidth: 360.048 GB/s
Total available graphics memory: 20433 MB
System video memory: N/A
Shared system memory: 8145 MB
Dedicated video memory: 12288 MB GDDR6
Video BIOS version: 94.04.71.40.09
Device ID: 10DE 2487 397D1462
Part number: G190 0055
IRQ: Not used
Bus: PCI Express x16 Gen3

Display (1): BenQ EW3270ZL
Resolution: 2560 x 1440 (native)
Refresh rate: 60 Hz
Desktop color depth: Highest (32-bit)
HDCP: Supported

Display (2): EW32S3PW
Resolution: 1080p, 1920 x 1080 (recommended)
Refresh rate: 60 Hz
Desktop color depth: Highest (32-bit)
HDCP: Supported

Is there anything else that can help developers narrow down the issue? (e.g. logs, screenshots,
configuration files, savefiles, savestates)

I had the bandana in my inventory by loading it in with a cheat at the very beginning of the game, but turned it off when I got up the elevator.