CPU8 is an educational app designed for students and software programmers interested in understanding how computers operate. It simulates the SAP-1 (Simple As Possible) 8-bit breadboard computer, popularized by Ben Eater's instructional videos. This app provides a hands-on experience in controlling a fully functional computer, showcasing microcode to demonstrate the functioning of various computer instructions and their relationships with registers, memory, and more.

With CPU8, users can utilize the built-in assembler to write and convert programs into machine language, offering a comprehensive understanding of the programming process. The app also features adjustable clock speed, program stepping, preloaded sample programs, links to Ben Eater's videos, and a detailed history of computing in 37 chapters.