On an Apple M4 Max (arm64) running macOS 26.6.2 (25G83) and CrossOver 26.3 (26.3.0.39832), Fallout 2's FMVs could slow down, skip, and repeat short pieces of audio. The cause is the game's self-modifying 8-bit Interplay MVE decoder. This patch replaces the decoder inside fallout2.exe with a non-self-modifying implementation.
This unofficial community patch is provided as-is, without warranty or support. Use it at your own risk and back up the executable and saves first. To the maximum extent permitted by law, the authors and contributors accept no liability for any claim, damage, data loss, or other consequence arising from its use.
The original decoder rewrites its own x86 instructions while processing nearly every 8×8 video block. On translated x86, those writes repeatedly invalidate translated code. Individual frames can take hundreds of milliseconds or more, which makes video skip and the streamed audio bu