emulator: Opera (4DO)
type: libretro
core_classification: community_fork
core: opera_libretro
cores: [opera]
source: "https://github.com/libretro/opera-libretro"
upstream: "https://sourceforge.net/projects/freedo/"
profiled_date: "2026-10-18"
source_commit: "684926fe2079ba12b59d99082291c0a8fe780c67"
core_version: "1.0.0"
display_name: "The 3DO Company - 3DO (Opera)"
systems:
  - 3do

notes: |
  Opera is the libretro port of the 4DO/FreeDO 3DO Interactive Multiplayer emulator.
  The system ROM (rom1) is chosen by the opera_bios core option. Its default is
  Opera Boot, an open boot ROM (trapexit/opera-boot) compiled into the core as a
  zlib stream and inflated at load, so the core starts with no file at all. The
  option lists the built-in ROM first, then each BIOS file physically present in
  the system directory; a file is read with read_file_from_system_directory()
  and byteswapped on little-endian hosts.

  opera-boot.bin is the same Opera Boot image read from the system directory
  ("Opera Boot (System)"), for a newer build than the one compiled in.

  Kanji font ROMs (rom2) are optional and only needed for Japanese text rendering.
  They are loaded via opera_lr_opts_set_font() and selected via opera_font core option.

  All BIOS files are exactly 1 MB (1048576 bytes) except opera-boot.bin (128 KB),
  3do_arcade_saot.bin (512 KB) and panafz1-kanji.bin (933636 bytes).

  BIOS definitions: BIOSES[] at libopera/opera_bios.c:9-164, built-in inflate
  opera_bios_load_builtin() at libopera/opera_bios.c:234-267.
  BIOS selection and loading: opera_lr_opts.c:276-359 (get_bios, _load_bios_rom,
  set_bios). Font loading: opera_lr_opts.c:361-415.
  Core option: libretro_core_options.c:752-783 (set_bios_values) lists the
  built-in ROM and the files present.

files:
  # -------------------------------------------------------
  # Opera Boot, read from the system directory
  # -------------------------------------------------------
  - name: "opera-boot.bin"
    system: 3do
    required: false
    size: 131072  # 128 KB
    sha256: "6cbd0664c36e64c315b699b43dfc27c176597ef8f393279f199986fa5b6ba3bb"
    crc32: "dacb21ad"
    note: "Opera Boot (System). The image opera_boot.h embeds, from trapexit/opera-boot (release 2026-10-12)."
    source_ref: "libopera/opera_bios.c:22-32, opera_boot.h:5-9"

  # -------------------------------------------------------
  # Panasonic FZ-1 (US) - original 3DO launch model
  # -------------------------------------------------------
  - name: "panafz1.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "f47264dd47fe30f73ab3c010015c155b"
    sha1: "34bf189111295f74d7b7dfc1f304d98b8d36325a"
    note: "Panasonic FZ-1 (U). Version unknown, dated 1993-08-03."
    source_ref: "libopera/opera_bios.c:33-45"

  # -------------------------------------------------------
  # Panasonic FZ-1 (Japan)
  # -------------------------------------------------------
  - name: "panafz1j.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "a496cfdded3da562759be3561317b605"
    sha1: "ec7ec62d60ec0459a14ed56ebc66761ef3c80efc"
    note: "Panasonic FZ-1 (J). Version 1.54, dated 1994-01-22."
    source_ref: "libopera/opera_bios.c:46-58"

  # -------------------------------------------------------
  # Panasonic FZ-1 (Japan) [No RSA]
  # -------------------------------------------------------
  - name: "panafz1j-norsa.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "f6c71de7470d16abe4f71b1444883dc8"
    sha1: "a417587ae3b0b8ef00c830920c21af8bee88e419"
    note: "Panasonic FZ-1 (J) with RSA check removed. Version 1.54."
    source_ref: "libopera/opera_bios.c:59-71"

  # -------------------------------------------------------
  # Panasonic FZ-10 (US) - slim redesign
  # -------------------------------------------------------
  - name: "panafz10.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "51f2f43ae2f3508a14d9f56597e2d3ce"
    sha1: "3c912300775d1ad730dc35757e279c274c0acaad"
    note: "Panasonic FZ-10 (U). Version 1.59.1.1, dated 1994-08-25."
    source_ref: "libopera/opera_bios.c:72-84"

  # -------------------------------------------------------
  # Panasonic FZ-10 (US) [No RSA]
  # -------------------------------------------------------
  - name: "panafz10-norsa.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "1477bda80dc33731a65468c1f5bcbee9"
    sha1: "f05e642322c03694f06a809c0b90fc27ac73c002"
    note: "Panasonic FZ-10 (U) with RSA check removed. Version 1.59.1.1."
    source_ref: "libopera/opera_bios.c:85-97"

  # -------------------------------------------------------
  # Panasonic FZ-10 (Europe) ANVIL
  # -------------------------------------------------------
  - name: "panafz10e-anvil.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "a48e6746bd7edec0f40cff078f0bb19f"
    sha1: "a900371f0cdcdc03f79557f11d406fd71251a5fd"
    note: "Panasonic FZ-10 (E) ANVIL. Version 1.66.1.1, dated 1994-09-22."
    source_ref: "libopera/opera_bios.c:98-110"

  # -------------------------------------------------------
  # Panasonic FZ-10 (Europe) ANVIL [No RSA]
  # -------------------------------------------------------
  - name: "panafz10e-anvil-norsa.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "cf11bbb5a16d7af9875cca9de9a15e09"
    sha1: "2765c7b4557cc838b32567d2428d088980295159"
    note: "Panasonic FZ-10 (E) ANVIL with RSA check removed. Version 1.66.1.1."
    source_ref: "libopera/opera_bios.c:111-123"

  # -------------------------------------------------------
  # Goldstar GDO-101M (US)
  # -------------------------------------------------------
  - name: "goldstar.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "8639fd5e549bd6238cfee79e3e749114"
    sha1: "c4a2e5336f77fb5f743de1eea2cda43675ee2de7"
    note: "Goldstar GDO-101M. Version 1.59, dated 1994-05-10."
    source_ref: "libopera/opera_bios.c:124-136"

  # -------------------------------------------------------
  # Sanyo Try IMP-21J (Japan)
  # -------------------------------------------------------
  - name: "sanyotry.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "35fa1a1ebaaeea286dc5cd15487c13ea"
    sha1: "b01c53da256dde43ffec4ad3fc3adfa8d635e943"
    note: "Sanyo Try IMP-21J. Version 1.59, dated 1994-05-10."
    source_ref: "libopera/opera_bios.c:137-149"

  # -------------------------------------------------------
  # 3DO Arcade - SAOT
  # -------------------------------------------------------
  - name: "3do_arcade_saot.bin"
    system: 3do
    required: false
    size: 524288  # 512 KB
    md5: "8970fc987ab89a7f64da9f8a8c4333ff"
    sha1: "520d3d1b5897800af47f92efd2444a26b7a7dead"
    note: "3DO Arcade SAOT board BIOS. Half the size of consumer BIOS ROMs."
    source_ref: "libopera/opera_bios.c:150-162"

  # -------------------------------------------------------
  # Kanji font ROM - FZ-1 (933636 bytes, non-standard size)
  # -------------------------------------------------------
  - name: "panafz1-kanji.bin"
    system: 3do
    required: false
    size: 933636
    md5: "b8dc97f778a6245c58e064b0312e8281"
    sha1: "acd39a8fee1b9d2950d5ab447846c11fb31af63e"
    note: "Kanji font ROM for FZ-1. Version 16.4, dated 1993-08-03. Optional, Japanese text only."
    source_ref: "libopera/opera_bios.c:168-180"

  # -------------------------------------------------------
  # Kanji font ROM - FZ-1J (1 MB)
  # -------------------------------------------------------
  - name: "panafz1j-kanji.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "c23fb5d5e6bb1c240d02cf968972be37"
    sha1: "884515605ee243577ab20767ef8c1a7368e4e407"
    note: "Kanji font ROM for FZ-1J. Version 16.4, dated 1993-08-03. Optional, Japanese text only."
    source_ref: "libopera/opera_bios.c:181-193"

  # -------------------------------------------------------
  # Kanji font ROM - FZ-10JA ANVIL (1 MB)
  # -------------------------------------------------------
  - name: "panafz10ja-anvil-kanji.bin"
    system: 3do
    required: false
    size: 1048576  # 1 MB
    md5: "428577250f43edc902ea239c50d2240d"
    sha1: "2e857b957803d0331fd229328df01f3ffab69eee"
    note: "Kanji font ROM for FZ-10JA ANVIL. Version 16.4. Optional, Japanese text only."
    source_ref: "libopera/opera_bios.c:194-206"

platform_details:
  3do:
    rom1_size: 1048576          # 1 MB standard BIOS
    rom1_arcade_size: 524288    # 512 KB arcade BIOS
    rom2_max_size: 1048576      # 1 MB kanji font ROM
    bios_selection: "core option opera_bios: built-in Opera Boot by default, or a detected file"
    font_selection: "core option opera_font, optional"
    byteswap: "rom1 is byteswapped on little-endian (opera_mem_rom1_byteswap32_if_le)"
    hle_available: true
    source_ref: "opera_lr_opts.c:276-359, libopera/opera_bios.c:9-267"