Minix

MINIX is an operating system that works like Unix. It was created in 1987 by a computer scientist named Andrew S. Tanenbaum. He made it so that students could learn about operating systems on their own home computers.

The name MINIX comes from “mini-Unix” because it was made to be similar to the Unix system. At first, people could see the code but could not change it freely. In 2000, it was changed so anyone could use and change it however they wanted.

Over the years, MINIX was made to work on many different types of computers. A big update in 2005, called MINIX 3, focused on making the system very reliable and able to fix itself when problems happen.

Implementation

Andrew S. Tanenbaum created MINIX at Vrije Universiteit in Amsterdam to show ideas from his book, Operating Systems: Design and Implementation (1987). It was made to work on affordable home computers of that time.

MINIX started as a simple version for IBM PC and IBM PC/AT computers. Over time, new versions added support for many different types of computers and features. MINIX 3, announced in 2005, was redesigned to be very reliable and could restart parts that stopped working without affecting other programs. It can run on many modern computer systems and supports many programming languages.

Relationship with Linux

Linus Torvalds used and liked MINIX, but he chose a different design for Linux, using a monolithic kernel instead of a microkernel. This choice was not approved by Tanenbaum, leading to a famous debate between them.

Early Linux development happened on MINIX systems, so Linux borrowed some features from MINIX, like its file system. Some people claimed that Linux was copied from MINIX, but these claims were widely rejected, especially by Tanenbaum himself.

Licensing

MINIX had a simple and affordable license when it was first made. People could buy it for a small fee, which included a book by its creator. This made it easier for students to access, even though the license had some limits.

Later, when other free operating systems like Linux appeared, many people stopped using MINIX. But in 2000, MINIX became free to use and change under a new license. Even so, it stayed mostly popular among students and hobbyists who enjoyed learning about operating systems.

Compared to other teaching operating systems

MINIX was created to teach students about operating systems in a simple and affordable way. Unlike other teaching operating systems, MINIX was designed to run on regular home computers that were available at the time. This made it easier for students to learn and experiment with operating systems without needing expensive equipment.