Thanks. I used to do some C++/sdl2 game programming just for fun but I think this project needs more study. TBH I don't know if Commander Keen is using protect

Thanks. I used to do some C++/sdl2 game programming just for fun but I think this project needs more study. TBH I don't know if Commander Keen is using protected mode. I do not understand the code and I assume not. I need to know how to program and compile for DOS 16-bit, as you said, and how to inline assembly, and how to use assembly to put pixels on screen using a virtual ega card provided by dosbox.