Viktor, creator of 3DOPlay, has offered his time to introducing his changes to the FreeDO core into 4DO. A more complete list of the changes is:

Timing fixes – a more proper fix for the “temporalfixes” setting in FreeDO’s original code

Sprites in Doom are fixed

Fonts and sound speed in Wicked 18 fixed

Sound in games better, no bugs (some examples are Need For Speed, Escape from Monster Manor, Star Fighter, Slayer, Pyramid Intruder)

Games work faster (some optimizations added)

“Bad Slack Calc” error fixed

Thank you Viktor!

The internal timing improvements have various noticeable improvements in games. I noticed that lip syncing in Lost Eden is now working correctly. Some benefits/changes from 3DOPlay are not added. For example, Phoenix 3 currently still hangs at loading screens in 4DO.

In addition to this, I’ve added a few higher-level changes:

In DirectX rendering, fixed diagonal pixel misalignment when using non-smoothed image resizing. – At certain window sizes, this was causing a “slice” down the diagonal at the center of the screen in which pixels were misaligned.

4DO now only emulates controllers/devices that have input bindings. For example, if you have only set up input bindings for controller #1, 4DO will only emulate one attached controller. This resolves the non-responsive controls in Super Wing Commander. However, if you create bindings for all 6 controllers, the game will produce this issue (perhaps the original game acted this way?).