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MINIX — The most popular OS in the world, thanks to Intel

If you have a modern Intel CPU (released in the last few years) with Intel’s Management Engine built in, you’ve got another complete operating system running that you might not have had any clue was in there: MINIX.

That’s right. MINIX. The Unix-like OS originally developed by Andrew Tanenbaum as an educational tool — to demonstrate operating system programming — is built into every new Intel CPU.