The Libretro Team

3DO Core improvements - CPU overclocking and video tearing fix!

Added 2018-03-11 23:42:16 +0000 UTC

Several improvements have been made to the libretro core version of the 3DO emulator, 4DO.

CPU overclocking

The 3DO used a 12.5MHz ARM CPU as its central processor. We have implemented a CPU overclocking feature in the 4DO core so that you can increase this by 2 (25MHz) or 4x (50MHz).

Shown in the above video are two games, Wolfenstein 3D and The Need For Speed. It appears both games run at an unlocked framerate, since you can get these games to run at a much better framerate without affecting the game's internal speed. Some games can't be made to run properly with this method, though, such as Doom.

https://www.youtube.com/watch?v=-eIEjwkh-Jw

Video tearing resolved for most games

There was previously an issue with the 3DO core, 4DO, where you could see clear video tearing going on.

In this video, you see us testing three games: Gex, Super Street Fighter II Turbo, and Need For Speed. All three of these games would previously exhibit severe signs of video tearing.

As you can see in the video, this no longer happens. However, the fix that a contributor sent is not a perfect magic bullet yet. There are still games like Wolfenstein 3D which can still show video tearing.