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Geolith - RetroBIOS
Type libretro
Classification official_port
Source https://github.com/libretro/geolith-libretro
Upstream https://gitlab.com/jgemu/geolith
Version 0.3.0
Profiled 2026-03-21
Cores geolith
Systems snk-neogeo-mvs, snk-neogeo-aes
Technical notes

Geolith is a highly accurate Neo Geo AES and MVS emulator using .NEO format ROMs only. BIOS files must be provided as MAME-format ZIP archives in the system directory. The core selects which ZIP to open based on the "geolith_system_type" core option (libretro/libretro.c:1017-1018): - AES mode -> aes.zip - MVS mode -> neogeo.zip - Uni mode -> neogeo.zip (loads uni-bios_4_0.rom from it)

Inside the ZIP, specific ROM files are extracted by filename (src/geo.c:162-241): 1. One 68K BIOS ROM, selected by system type + region: - AES Japan: neo-po.bin - AES other: neo-epo.bin - MVS US: sp-u2.sp1 - MVS Japan: japan-j3.bin - MVS Asia: sp-45.sp1 - MVS Europe: sp-s2.sp1 - Universe: uni-bios_4_0.rom 2. 000-lo.lo (zoom lookup table, always required) 3. sfix.sfix (FIX layer tiles, required for MVS/Uni, not AES) 4. sm1.sm1 (Z80 sound BIOS, required for MVS/Uni, not AES)

The AES mode only needs the 68K BIOS + 000-lo.lo. MVS and Universe BIOS modes additionally need sfix.sfix and sm1.sm1.

11 files | 6 required, 5 optional | 2 in repo, 9 missing

sp-u2.sp1 -required, in neogeo.zip, missing from repo

  • System: snk-neogeo-mvs
  • Size: 128.0 KB
  • CRC32: e72943de
  • Source: src/geo.c:174
  • MVS USA ver. 5 (2 slot) - default for US region

japan-j3.bin -optional, in neogeo.zip, missing from repo

  • System: snk-neogeo-mvs
  • Size: 128.0 KB
  • CRC32: dff6d41f
  • Source: src/geo.c:177
  • MVS Japan (J3) - default for JP region

sp-45.sp1 -optional, in neogeo.zip, missing from repo

  • System: snk-neogeo-mvs
  • Size: 512.0 KB
  • CRC32: 03cc9f6a
  • Source: src/geo.c:180
  • NEO-MVH MV1C (Asia) - default for AS region

sp-s2.sp1 -optional, in neogeo.zip, missing from repo

  • System: snk-neogeo-mvs
  • Size: 128.0 KB
  • CRC32: 9036d879
  • Source: src/geo.c:183
  • MVS Asia/Europe ver. 5 (1 slot) - default for EU region

uni-bios_4_0.rom -optional, in neogeo.zip, missing from repo

  • System: snk-neogeo-mvs
  • Size: 128.0 KB
  • CRC32: a7aab458
  • Source: src/geo.c:189
  • Universe BIOS ver. 4.0 - only version supported by Geolith

000-lo.lo -required, in neogeo.zip

sfix.sfix -required, in neogeo.zip, missing from repo

  • System: snk-neogeo-mvs
  • Size: 128.0 KB
  • CRC32: c2ea0cfd
  • Source: src/geo.c:218-219
  • System FIX layer tiles (text layer)

sm1.sm1 -required, in neogeo.zip, missing from repo

  • System: snk-neogeo-mvs
  • Size: 128.0 KB
  • CRC32: 94416d67
  • Source: src/geo.c:229-230
  • Z80 sound BIOS

neo-epo.bin -required, in aes.zip, missing from repo

  • System: snk-neogeo-aes
  • Size: 128.0 KB
  • CRC32: d27a71f1
  • Source: src/geo.c:168
  • AES Asia/US/EU - default for non-JP regions

neo-po.bin -optional, in aes.zip, missing from repo

  • System: snk-neogeo-aes
  • Size: 128.0 KB
  • CRC32: 16d0c132
  • Source: src/geo.c:167-168
  • AES Japan - default for JP region

000-lo.lo -required, in aes.zip

Generated on 2026-03-25T14:56:43Z