Geolith is a highly accurate emulator for the Neo Geo AES and MVS.
This emulator supports TerraOnion's .NEO file format only.
BIOS files from a recent MAME set are required:
This is the libretro port of the Geolith emulator, whose upstream repository lives at: https://gitlab.com/jgemu/geolith
geolith-libretro supports the following input devices:
Neo Geo Joystick Multiplayer Extension Board (NEO-FTC1B, 4 Player) V-Liner
Geolith is compatible with 100% of the commercially released Neo Geo AES and MVS libraries. Most games work in both modes, but some require MVS mode.
All bootlegs and hacks from the MAME set are compatible, the majority of which require being run in MVS mode. Other bootlegs and hacks not in the MAME set may be compatible if correctly converted to the .NEO format.
Some MVS releases will exhibit glitches when run on an AES BIOS. Home Console releases are preferred when running in AES mode.
Some early prototypes are not currently possible to emulate, pending new dumps or new information: Stakes Winner (early development board) - Missing data from SRAM chip
Dedicated JAMMA PCB and Neo Geo CD systems are not currently supported. PAL mode is not currently supported.
The special inputs for Irritating Maze are not yet supported. It is possible to play Irritating Maze using the Universe BIOS with a cheat enabled for joystick controls.
Geolith's CPUs are emulated at instruction level granularity and are very tightly synced to each other as well as the LSPC (video) and YM2610 (sound). Video related events are timed with a "best effort" approach based on available documentation, with future original hardware research on the agenda. The longer term goal is to have completely cycle accurate video rendering, but for now, things are emulated accurately enough that all games are fully playable with only very minor differences from real hardware, and no known major bugs.
Any contributions should respect the coding style and the direction and goals of this emulator. All code should be placed under a permissive license (BSD, MIT, etc). Changes made for portability or speed should be as generic as possible, and any preprocessor directives for platform-specific code should be avoided at all costs in the interest of keeping the emulator core clean, maintainable, and free of regressions.
Geolith (BSD-3-Clause) Copyright (c) 2022-2024 Rupert Carmichael See LICENSE
Jolly Good Z80 (MIT) Copyright (c) 2019 Nicolas Allemand Copyright (c) 2020-2022 Rupert Carmichael Copyright (c) 2022 rofl0r See src/z80/LICENSE
miniz (MIT) Copyright 2013-2014 RAD Game Tools and Valve Software Copyright 2010-2014 Rich Geldreich and Tenacious Software LLC See deps/miniz/miniz.c (https://github.com/richgel999/miniz)
Musashi (MIT) Copyright (c) 1998-2019 Karl Stenerud See src/m68k/readme.txt (https://github.com/kstenerud/Musashi)
Speex Resampler (BSD-3-Clause) Copyright (c) 2003, 2007, 2008 Xiph.org Foundation See source files in deps/speex/ (https://github.com/xiph/speexdsp)
YMFM-C (BSD-3-Clause) Copyright (c) 2021 Aaron Giles Copyright (c) 2022 Rupert Carmichael See source files in src/ymfm
This emulator could not have been written without the hard work and research done by the FinalBurn Neo project, MAME, GnGeo, and the NeoGeo Development Wiki.