Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

model

A simplified, predictable imitation of a piece of hardware that a page can run, labelled as a model.

A model in this course is a deterministic simulation (of a CPU, cache, pipeline or predictor) that follows stated rules; it illustrates a mechanism, not the timing of a real chip.