The 3DO Company - 3DO (4DO)¶

Background¶

4DO is an open-source, low-level emulator for the 3DO Game Console based on the FreeDO source code.

The 4DO core has been authored by

The 4DO core is licensed under

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

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-patched.bin	Panasonic FZ-10 [RSA Patch]	1477bda80dc33731a65468c1f5bcbee9
panafz10e-anvil.bin	Panasonic FZ-10-E [Anvil]	a48e6746bd7edec0f40cff078f0bb19f
panafz10e-anvil-patched.bin	Panasonic FZ-10-E [Anvil RSA Patch]	cf11bbb5a16d7af9875cca9de9a15e09
goldstar.bin	Goldstar GDO-101M	8639fd5e549bd6238cfee79e3e749114
sanyotry.bin	Sanyo IMP-21J TRY	35fa1a1ebaaeea286dc5cd15487c13ea
3do_arcade_saot.bin	Shootout At Old Tucson	8970fc987ab89a7f64da9f8a8c4333ff

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

Content that can be loaded by the 4DO core have the following file extensions:

RetroArch database(s) that are associated with the 4DO core:

Frontend-level settings or features that the 4DO core respects.

The 4DO core's library name is '4DO'

The 4DO core saves/loads to/from these directories.

Frontend's Save directory

Frontend's State directory

File	Description
*.state#	State

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

The 4DO 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 [4do_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 4DO core so that you can increase performance upto 2x.

May not have an impact on all games.

https://www.youtube.com/watch?v=7bT2ecwKdHQ
High Resolution [4do_high_resolution] (disabled|enabled)

The default internal resolution is 320x240, but the output resolution is 640x480. This feature makes the system behave as if it has a 640x480 framebuffer.

??? note "High Resolution - disabled"

??? note "High Resolution - enabled"

NVRAM Storage [4do_nvram_storage] (per game|shared)

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 [4do_active_devices] (1|2|3|4|5|6|7|8|0)

There is a bug (maybe in 4DO 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) [4do_hack_timing_1] (disabled|enabled)

Enable this to fix Crash 'n Burn.
Timing Hack 3 (Dinopark Tycoon) [4do_hack_timing_3] (disabled|enabled)

Enable this to fix Dinopark Tycoon.
Timing Hack 5 (Microcosm) [4do_hack_timing_5] (disabled|enabled)

Enable this to fix Microcosm.
Timing Hack 6 (Alone in the Dark) [4do_hack_timing_6] (disabled|enabled)

Enable this to fix Alone in the Dark.
Graphics Step Y Hack (Samurai Shodown) [4do_hack_graphics_step_y] (disabled|enabled)

Enable this to fix Samurai Shodown's background rendering.