|License||LGPL with additional notes|
4DO is a 3DO video game system emulator that can be used as a libretro core.
4DO is an open-source, low-level emulator for the 3DO Game Console based on the FreeDO source code.
These are libretro features, not frontend or standalone emulator features.
|Saves||Save states||Rewind||Netplay||Cheats||Controllers API||Rumble||Sensors||Camera||Location||Subsystem API|
4DO requires the following BIOS image file for operation
- panafz10.bin (Panasonic FZ-10 BIOS)
This core has a few options that can be tweaked from the core options menu. The default setting is highlighted and in italics:
- 4do_high_resolution (disabled/enabled)(restart): Doubles the internal resolution.
Compatibility List/General Issues
Main article: 
The 4DO core supports one controller setting:
- 3DO Joypad: 3DO Controller