I am still fascinated by the ZeldaClassic project, particularly when it comes to the possibility of creating an interoperable game engine to play the ZC data files.

Fortunately, the project has released some source code that writes out an unencoded quest file (extension .qsu). This divulges quite a few useful details. For greater context, there is the ZQuest editor that is packaged with the ZeldaClassic game which allows you to create qsu files and tweak existing ones. Further, PureZC has a Wiki that clarifies a lot of the technical details of the game’s data structures.

Anyway, I have started writing clear documentation for the qsu file format. Also, I have a sample C program that parses many of the data structures in such files.