What is neslab?

NESLab is a Japanese language educational project for learning how computers work at a low level, using the Nintendo Entertainment System as the teaching platform. Instead of writing code for a modern operating system, students write programs in C for the NES itself, where a single CPU, a fixed amount of memory, and a picture processing unit for graphics interact directly, with nothing hidden behind layers of abstraction. The README frames this as a way to understand ideas that are easy to skip past in an ordinary introductory course: why early computing needed a language like C at all rather than working purely in assembly or machine code, how a CPU reads and executes instructions stored in memory, how writing to a specific memory address can directly control what appears on screen or what sound plays, and how a game loop repeats sixty times a second to handle input, check for collisions, and draw the next frame. It also touches on what a compiler actually does, translating human written C code through an assembly stage into the raw machine code the NES hardware runs. No local setup is required to get started. The whole lab runs inside a Google Colab notebook in the browser, reached through an Open In Colab button on the project page. Opening the notebook and running its setup cell clones the repository and automatically installs cc65, the C compiler used to target the NES, so a newcomer can begin experimenting with real hardware level programming within a few minutes rather than spending time configuring a development environment first. The project is written primarily in C++ according to its repository metadata, likely reflecting supporting tooling around the core C based NES lessons.