To get .sys driver you have to run compile.but at first and then build.bat. compile.bat runs Delphi part of the work creating .obj. build.bat then converts this object file to MS supported format of OMF using OMF2D 1.02 written by EliCZ and then MS linker link.exe is used to assemble final .sys.
In samples directory you've got some of our samples. Each example includes its own compile and build scripts. To compile debug version run compile.debug.bat instead of compile.bat.