Pintos is computer software, a simple instructional operating system framework for the 80x86 processor architecture. It supports kernel threads, loading and running user programs, and a file system, but it implements all of these in a very simple way. It was created at Stanford University by Ben Pfaff in 2004. It originated as a replacement for Not Another Completely Heuristic Operating System (Nachos), a similar system originally developed at UC Berkeley by Thomas E. Anderson, and was designed along similar lines. Like Nachos, Pintos is intended to introduce undergraduates to concepts in operating system design and implementation by requiring them to implement significant portions of a real operating system, including thread and memory management and file system access. Pintos also teache