Beetle PCE Fast / Mednafen PCE Fast, GPL-2.0-or-later. Upstream https://github.com/libretro/beetle-pce-fast-libretro, commit 4eee99c. Full license and dependency notices are in corresponding-source.tar.gz. Emscripten 4.0.20; use the included build.sh after sourcing emsdk_env.sh. Modified CHD reader validates both raw sector addresses before recovering a virtual pregap which the image metadata incorrectly labels as stored. It corrects the data offset, length and following TOC entries together. Applied only through this dedicated player. Frontend reads original CHD by ranges, cache 64 MiB, automatic existing owner System Card 3. No disc or proprietary firmware is part of the source package.