4DO is an open-source, low-level emulator based on the FreeDO source code. 4DO was able to inherit many great features from FreeDO: high-definition rendering, clock speed adjustments, and the impressive emulation accuracy!
The development of 4DO has introduced several unique features as well: intuitive controller setup, native joystick support, and support for up to 6 players; game identification system; easy-to-use quick save/load system; game compatibility fixes, and multilanguage support.
Here's changelog for latest release:
+ Fixed file extraction – File extraction from the file browser was not functioning because of a missing DLL from the released 1.3.2.2 files.
+ File browser tweaks – Users can now cancel copy operations, and basic progress indicators have been added.
Visit official homepage and sourceforge repository for latest files and further information.
The development of 4DO has introduced several unique features as well: intuitive controller setup, native joystick support, and support for up to 6 players; game identification system; easy-to-use quick save/load system; game compatibility fixes, and multilanguage support.

Here's changelog for latest release:
+ Fixed file extraction – File extraction from the file browser was not functioning because of a missing DLL from the released 1.3.2.2 files.
+ File browser tweaks – Users can now cancel copy operations, and basic progress indicators have been added.
Visit official homepage and sourceforge repository for latest files and further information.