Hi ripsaw8080 thank you very much for your answer. :blush: I think the huge switch-statement in CPU_Core_Normal_Run() and the code in the "core_normal/prefix*.h" - files is the right place where to start for this. I do know single-stepping, but currently I don't have a clue how to make use of it in …

Hi all, I would like to patch DosBox, but I don't really know where to start. The goal is to code some kind of hook, that patches the executable (running in the DosBox-environment) under certain circumstances on the fly. For instance: Alter a JNE into a JMP when AX==0 or something like this. I can't …