Skip to content
RetroBIOS

Opera (4DO)

Opera (4DO) emulates 3DO. It reads 14 files, none of them required: it starts games without them.

About this profile
Detail Value
Type libretro
Classification Community fork
Source https://github.com/libretro/opera-libretro
Upstream https://sourceforge.net/projects/freedo/
Version 1.0.0, stated in libretro.c
Revision libretro/opera-libretro@370d9a25c030
Profiled 2026-10-18
Profile YAML, JSON
Cores opera
Systems 3DO
Core ID opera_libretro
Install this emulator's files

The installer finds your setup and its BIOS folder, then downloads only the files this emulator reads there and checks each one.

Open the Start menu. Type PowerShell and open it. Paste the line. Press Enter.

PowerShell
&([scriptblock]::Create((irm https://abdess.github.io/retrobios/i.ps1))) --emulator opera
Platform details

  • 3do:

    • rom1_size: 1048576
    • rom1_arcade_size: 524288
    • rom2_max_size: 1048576
    • 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: yes
    • source_ref: opera_lr_opts.c:276-359, libopera/opera_bios.c:9-267
Technical 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

Section titled “Files”

14 files: 0 required, 14 optional.

In this collection: 14 in repo and 0 missing.

Optional

Section titled “Optional”
FileStatusHash

opera-boot.bin

  • System: 3DO
  • Opera Boot (System). The image opera_boot.h embeds, from trapexit/opera-boot (release 2026-10-12).
Hashes and source
in repoCRC32 dacb21ad

panafz1.bin

  • System: 3DO
  • Panasonic FZ-1 (U). Version unknown, dated 1993-08-03.
Hashes and source
in repoMD5 f47264dd47fe

panafz1j.bin

  • System: 3DO
  • Panasonic FZ-1 (J). Version 1.54, dated 1994-01-22.
Hashes and source
in repoMD5 a496cfdded3d

panafz1j-norsa.bin

  • System: 3DO
  • Panasonic FZ-1 (J) with RSA check removed. Version 1.54.
Hashes and source
in repoMD5 f6c71de7470d

panafz10.bin

  • System: 3DO
  • Panasonic FZ-10 (U). Version 1.59.1.1, dated 1994-08-25.
Hashes and source
in repoMD5 51f2f43ae2f3

panafz10-norsa.bin

  • System: 3DO
  • Panasonic FZ-10 (U) with RSA check removed. Version 1.59.1.1.
Hashes and source
in repoMD5 1477bda80dc3

panafz10e-anvil.bin

  • System: 3DO
  • Panasonic FZ-10 (E) ANVIL. Version 1.66.1.1, dated 1994-09-22.
Hashes and source
in repoMD5 a48e6746bd7e

panafz10e-anvil-norsa.bin

  • System: 3DO
  • Panasonic FZ-10 (E) ANVIL with RSA check removed. Version 1.66.1.1.
Hashes and source
in repoMD5 cf11bbb5a16d

goldstar.bin

  • System: 3DO
  • Goldstar GDO-101M. Version 1.59, dated 1994-05-10.
Hashes and source
in repoMD5 8639fd5e549b

sanyotry.bin

  • System: 3DO
  • Sanyo Try IMP-21J. Version 1.59, dated 1994-05-10.
Hashes and source
in repoMD5 35fa1a1ebaae

3do_arcade_saot.bin

  • System: 3DO
  • 3DO Arcade SAOT board BIOS. Half the size of consumer BIOS ROMs.
Hashes and source
in repoMD5 8970fc987ab8

panafz1-kanji.bin

  • System: 3DO
  • Kanji font ROM for FZ-1. Version 16.4, dated 1993-08-03. Optional, Japanese text only.
Hashes and source
in repoMD5 b8dc97f778a6

panafz1j-kanji.bin

  • System: 3DO
  • Kanji font ROM for FZ-1J. Version 16.4, dated 1993-08-03. Optional, Japanese text only.
Hashes and source
in repoMD5 c23fb5d5e6bb

panafz10ja-anvil-kanji.bin

  • System: 3DO
  • Kanji font ROM for FZ-10JA ANVIL. Version 16.4. Optional, Japanese text only.
Hashes and source
in repoMD5 428577250f43

Next steps

Section titled “Next steps”
.

Maintained by Abdess on GitHub. Report a problem.

Packs from release v2026.10.10, .

MIT for the tooling and metadata. BIOS and firmware files are third-party system software, preserved for personal backup, archival and interoperability.