The most difficult part of his work still is not coding by itself but the compilation of his program (it's impossible to test a program without it) - only thing he got as a result of compilation is a dev_p1.rom. He doesn't know how to make the compiler to execute remaining commands in Makefile, because he is not fully get used to work with a makefiles for now.
Sources of Tomahomae's project is here. It uses the DATlib.
