Jason “Xarton Dragon” Penney has released a set of patches for Ultima 1 through Ultima 6, which should theoretically be applicable to most installations of the games, inside or outside of DOSBox. The patches are distributed in the PDAR (Portable Delta ARchive) format, and contain only the differences between the patched files and the unpatched files. This should streamline and speed the process of patch application, and also removes much of the hassle of the actual installation process that other patching utilities utilize.
Most of the major patches for each game are included, and a complete listing (as well as installation instructions) can be found in the main download. Also available for download are a Windows PDAR application and the PDAR source code.
These have been tested against the GOG versions of the games and are confirmed to work thereupon. Xarton will soon be testing them against the Ultima Collection CD installations, and it is expected that the patches will prove effective for those versions of the games as well.