This is an AI assisted decompilation of the Ultima 7 game code. Original names were used wherever they were available, but the majority of the function and variable names are inferred, however the logic itself was tested to produce byte exact results using Borland C++ 2.0, the compiler originally used to build Ultima 7.
The decompiled folder contains the source code for the various binaries in Ultima 7: The Black Gate and Ultima 7 Part Two: Serpent Isle. A lot of the original source was assembly code, which was faithfully preserved. It seems that they also used .c extensions for their C++ code, so I kept that convention.
The ultima7-portable folder is an attempt to clean up the decompiled code to make it more cross-platform friendly with minimal changes to the logic, so that the original games can be played on modern machines. Black Gate and Serpent Isle are both built as drop-in replacement binaries. Each merges the multiple programs for the intro, endgame, menu, and main game, clears the globals between each load, attempts to catch or fix null pointer exceptions that were valid in dos, 16 to 32 bit issues, and etc. For audio, you can use either the integrated Munt by providing MT32 roms, or using the integrated Nuked OPL3 for adlib support. The other cross platform functions are handled by the Matoya library. If you want the original experience, warts and all, on a modern PC, this is what you are looking for.
The ultima7-usecode folder is tools for decompiling and building and working with U7 usecode. They haven't really been tested on anything but a mac.