Background¶

Opera is an open-source, low-level emulator for the 3DO Game Console. Opera is a fork of 4DO, originally a port of 4DO, itself a fork of FreeDO, to libretro. The fork/rename occurred due to the original 4DO project being dormant and to differentiate the project due to new development and focus.

The Opera core has been authored by

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• trapexit
• JohnnyDude
• FreeDO team

The Opera core is licensed under

• Modified GNU LGPL / Non-commercial

A summary of the licenses behind RetroArch and its cores can be found here.

BIOS¶

One of the following system BIOSes is required to run software. Place in the frontend’s system directory.

Filename Description md5sum panafz1.bin Panasonic FZ-1 f47264dd47fe30f73ab3c010015c155b panafz10.bin Panasonic FZ-10 51f2f43ae2f3508a14d9f56597e2d3ce panafz10-norsa.bin Panasonic FZ-10 [RSA Patch] 1477bda80dc33731a65468c1f5bcbee9 panafz10e-anvil.bin Panasonic FZ-10-E [Anvil] a48e6746bd7edec0f40cff078f0bb19f panafz10e-anvil-norsa.bin Panasonic FZ-10-E [Anvil RSA Patch] cf11bbb5a16d7af9875cca9de9a15e09 panafz1j.bin Panasonic FZ-1J a496cfdded3da562759be3561317b605 panafz1j-norsa.bin Panasonic FZ-1J [RSA Patch] f6c71de7470d16abe4f71b1444883dc8 goldstar.bin Goldstar GDO-101M 8639fd5e549bd6238cfee79e3e749114 sanyotry.bin Sanyo IMP-21J TRY 35fa1a1ebaaeea286dc5cd15487c13ea 3do_arcade_saot.bin Shootout At Old Tucson 8970fc987ab89a7f64da9f8a8c4333ff

FONT ROM¶

Required for some Japanese games. Optional otherwise.

Filename Description md5sum panafz1-kanji.bin Panasonic FZ-1 Kanji ROM b8dc97f778a6245c58e064b0312e8281 panafz10ja-anvil-kanji.bin Panasonic FZ-10JA Kanji ROM 428577250f43edc902ea239c50d2240d panafz1j-kanji.bin Panasonic FZ-1J Kanji ROM c23fb5d5e6bb1c240d02cf968972be37

Extensions¶

Content that can be loaded by the Opera core have the following file extensions:

• .iso
• .bin
• .chd
• .cue

RetroArch database(s) that are associated with the Opera core:

• The 3DO Company – 3DO

Features¶

Frontend-level settings or features that the Opera core respects.

Feature Supported Restart ✔ Screenshots ✔ Saves ✔ States ✔ Rewind ✔ Netplay ✔ Core Options ✔ RetroAchievements ✔ RetroArch Cheats ✕ Native Cheats ✕ Controls ✔ Remapping ✔ Multi-Mouse ✕ Rumble ✕ Sensors ✕ Camera ✕ Location ✕ Subsystem ✕ Softpatching ✕ Disk Control ✕ Username ✕ Language ✕ Crop Overscan ✕ LEDs ✕

Directories¶

The Opera core’s library name is ‘Opera’

The Opera core saves/loads to/from these directories.

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Frontend’s Save directory

File Description *.srm Per game NVRAM 3DO.nvram Shared NVRAM 3DO.nvram.tmp Only used for atomic saves

Frontend’s State directory

File Description *.state# State

Geometry and timing¶

• The Opera core’s core provided FPS is 60
• The Opera core’s core provided sample rate is 44100 Hz
• The Opera core’s base width is 320 when the ‘High Resolution’ core option is set to disabled.
• The Opera core’s base height is 240 when the ‘High Resolution’ core option is set to disabled.
• The Opera core’s max width is 320 when the ‘High Resolution’ core option is set to disabled.
• The Opera core’s max height is 240 when the ‘High Resolution’ core option is set to disabled.
• The Opera core’s base width is 640 when the ‘High Resolution’ core option is set to enabled.
• The Opera core’s base height is 480 when the ‘High Resolution’ core option is set to enabled.
• The Opera core’s max width is 640 when the ‘High Resolution’ core option is set to enabled.
• The Opera core’s max height is 480 when the ‘High Resolution’ core option is set to enabled.
• The Opera core’s core provided aspect ratio is 4/3

Core options¶

The Opera core has the following option(s) that can be tweaked from the core options menu. The default setting is bolded.

Settings with (Restart) means that core has to be closed for the new setting to be applied on next launch.

• CPU overclock [opera_cpu_overclock] (1.0x (12.50Mhz)|1.1x (13.75Mhz)|1.2x (15.00Mhz)|1.5x (18.75Mhz)|1.6x (20.00Mhz)|1.8x (22.50Mhz)|2.0x (25.00Mhz))

  The 3DO used a 12.5MHz ARM60 CPU as its central processor. We have implemented a CPU overclocking feature in the Opera core so that you can increase performance upto 2x.

  May not have an impact on all games.

• High Resolution [opera_high_resolution] (disabled|enabled)

  The default internal resolution is 320×240, but the output resolution is 640×480. This feature makes the system behave as if it has a 640×480 framebuffer.

High Resolution – disabled High Resolution – enabled

• NVRAM Storage [opera_nvram_storage] (per game|shared)

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  Choose whether NVRAM saves are per game or NVRAM saves are shared between all games.

  Look at the Directories section for more information.

• Active Devices [opera_active_devices] (1|2|3|4|5|6|7|8|0)

  There is a bug (maybe in Opera but possibly in certain games) in which having more than 1 controller emulated causes the game not to respond to input. This allows working around the issue.

• Timing Hack 1 (Crash ‘n Burn) [opera_hack_timing_1] (disabled|enabled)

  Enable this to fix Crash ‘n Burn.

• Timing Hack 3 (Dinopark Tycoon) [opera_hack_timing_3] (disabled|enabled)

  Enable this to fix Dinopark Tycoon.

• Timing Hack 5 (Microcosm) [opera_hack_timing_5] (disabled|enabled)

  Enable this to fix Microcosm.

• Timing Hack 6 (Alone in the Dark) [opera_hack_timing_6] (disabled|enabled)

  Enable this to fix Alone in the Dark.

• Graphics Step Y Hack (Samurai Shodown) [opera_hack_graphics_step_y] (disabled|enabled)

  Enable this to fix Samurai Shodown’s background rendering.

Joypad¶

User 1 – 2 Remap descriptors RetroPad Inputs B A X (Stop) P (Play/Pause) D-Pad Up D-Pad Down D-Pad Left D-Pad Right C L R

Compatibility¶

• Opera Core Compatibility List

External Links¶

• Official 4DO Website
• Official 4DO Wiki
• Official 4DO SourceForge Repository
• Libretro Opera Core info file
• Libretro Opera Github Repository
• Report Libretro Opera Core Issues Here
• Gameplay Videos

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