v2026.04.02/emulators/chimerasnes.yml

emulator: ChimeraSNES
type: libretro
core_classification: community_fork
source: "https://github.com/jamsilva/chimerasnes"
upstream: "https://github.com/snes9xgit/snes9x"
profiled_date: "2026-03-23"
core_version: ""
display_name: "Nintendo - SNES / SFC (ChimeraSNES)"
cores: [chimerasnes]
systems:
  - nintendo-snes
  - nintendo-satellaview
  - nintendo-sufami-turbo

notes: |
  Based on multiple snes9x forks (uosnes, snes9x2005), optimized for slow hardware.
  All coprocessor data (DSP1-4, CX4, SuperFX, SA-1, SPC7110, OBC1) is HLE with
  embedded ROM tables. No external coprocessor firmware needed.
  BS-X BIOS loading controlled by core option chimerasnes_bsx_bios (default: skip).
  retro_load_game_special() returns false (no subsystem support).
  .info firmware_count absent (= 0), under-declares: code loads 2 files.

files:
  - name: "BS-X.bin"
    system: nintendo-satellaview
    description: "Satellaview BS-X BIOS"
    required: false
    size: 1048576
    source_ref: "source/bsx.c:857-882"
    aliases: ["BS-X.bios"]
    validation: [size]
    notes: |
      Loaded by BSX_LoadBIOS() from system_dir when core option
      chimerasnes_bsx_bios is set to 'load' (default: skip).
      Tries BS-X.bin first, then BS-X.bios as fallback.
      Size must be BIOS_SIZE (0x100000). Many BS-X games run without it.

  - name: "STBIOS.bin"
    system: nintendo-sufami-turbo
    description: "Sufami Turbo BIOS"
    required: true
    size: 262144
    source_ref: "source/memmap.c:275-289"
    notes: |
      Loaded by LoadSFTBIOS() from system_dir when Sufami Turbo game
      detected (BANDAI SFC-ADX header at ROM offset 0, memmap.c:833).
      Reads 0x40000 bytes into Memory.ROM. No validation performed.