yabause

Type	libretro
Classification	Community forks
Source	https://github.com/libretro/yabause
Upstream	https://github.com/Yabause/yabause
Version	v0.9.15
Revision	libretro/yabause@8926b0c6c347
Profiled	2026-03-25
Profile	YAML, JSON
Cores	yabause
Systems	sega-saturn

Technical notes

Yabause is a software-rendered Sega Saturn emulator. Upstream project is dead. The libretro port is maintained by the community on the master branch of libretro/yabause.

Saturn BIOS search order: 1. {system}/saturn_bios.bin 2. {system}/sega_101.bin 3. {system}/mpr-17933.bin First file found wins. HLE BIOS available via yabause_force_hle_bios core option (reduced compatibility). Multi-disc (m3u) requires real BIOS.

Addon cartridges: 1M/4M RAM expansion via core option (no files needed). ROM cartridge loading, SH1 ROM (CD Block LLE), and MPEG card ROM are standalone-only features disabled in the libretro port.

BIOS loading: retro_load_game() at yabause/src/libretro/libretro.c:1035-1049. Core load: LoadBios() at yabause/src/memory.c:1260-1263, T123Load() at yabause/src/memory.h:196-265.

3 files | 1 required, 2 optional | 3 in repo, 0 missing | 3 with HLE fallback

saturn_bios.bin required in repo HLE fallback #

• System: sega-saturn
• Size: max 512.0 KB
• Priority: 1
• Validation: max_size
• Source: yabause/src/libretro/libretro.c:1035
• Collection copy: bios/Sega/Saturn/sega_100.bin
• Platforms: batocera saturn_bios.bin, emudeck saturn_bios.bin, lakka kronos/saturn_bios.bin, saturn_bios.bin, sega_100.bin, recalbox saturn/saturn_bios.bin, retroarch kronos/saturn_bios.bin, saturn_bios.bin, sega_100.bin, retrobat kronos/saturn_bios.bin, saturn_bios.bin, retrodeck bios/saturn_bios.bin, bios/sega_100.bin, retropie kronos/saturn_bios.bin, saturn_bios.bin, sega_100.bin, rocknix saturn_bios.bin, romm saturn/saturn_bios.bin, saturn/sega_100.bin
• Primary Saturn BIOS. Any region accepted.

sega_101.bin optional in repo HLE fallback #

• System: sega-saturn
• Size: max 512.0 KB
• Priority: 2
• Validation: max_size
• Source: yabause/src/libretro/libretro.c:1039
• Collection copy: bios/Sega/Saturn/SAT_1.01-(J).bin
• Platforms: batocera sega_101.bin, bizhawk SAT_1.01-(J).bin, emudeck sega_101.bin, lakka sega_101.bin, recalbox saturn/sega_101.bin, retroarch sega_101.bin, retrobat sega_101.bin, retrodeck bios/sega_101.bin, retropie sega_101.bin, rocknix sega_101.bin, romm saturn/sega_101.bin
• Saturn BIOS v1.01 (Japan). Fallback if saturn_bios.bin missing.

mpr-17933.bin optional in repo HLE fallback #

• System: sega-saturn
• Size: max 512.0 KB
• Priority: 3
• Validation: max_size
• Source: yabause/src/libretro/libretro.c:1043
• Collection copy: bios/Sega/Saturn/SAT_1.00-(U+E).bin
• Platforms: batocera mpr-17933.bin, bizhawk SAT_1.00-(U+E).bin, emudeck mpr-17933.bin, lakka mpr-17933.bin, recalbox saturn/mpr-17933.bin, retroarch mpr-17933.bin, retrobat mpr-17933.bin, retrodeck bios/mpr-17933.bin, retropie mpr-17933.bin, rocknix mpr-17933.bin, romm saturn/mpr-17933.bin
• Saturn BIOS (NA/EU). Last fallback.

Generated on 2026-10-20T03:49:43Z