Popularly, chip music is nowadays made in music creation tools names as trackers: An example of one, is Dn-Famitracker, which targets the sound processing unit used on the Nintendo Entertainment System video game console system, and some sound chip expansion used on video games for its Japanese counterpart Famicom video game console system. Another approach to, is writing music targeting a macro music language compiler, supporting them, as the macro music compiler named as PPMCK.
One can program a sound driver, and write sound data targetting it; the Nerdy Nights tutorials proposes an approach to. Another introduction to program targeting the Nintendo Entertainment and Famicom video game console systems, may be found on a electronic book, named as Famicom Party.
May I ask: Which are the systems or sound chip that you, may, feel most desire to write music for?
Battle of the Bits offers articles about systems, and creating music targeting different sound chips and formats: One browse of, also in the web page that the next hyperlink leads at: