Quoted from the 2021 edition: "Project 4 is written in the computer’s assembly language, and projects 9 and 12 (a simple computer game and a basic operating sy

Quoted from the 2021 edition: "Project 4 is written in the computer’s assembly language, and projects 9 and 12 (a simple computer game and a basic operating system) are written in Jack—the Java-like high-level language for which we build a compiler in chapters 10 and 11."