Free Small OS Code: Learn Operating System Fundamentals

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For those learning operating system fundamentals and seeking small, free operating system code (excluding Linux), several resources are available. The Brown University simulator allows users to load and interact with an OS kernel, with a specific kernel provided by a professor, though it may have missing portions. OS/161 is another educational tool designed for undergraduate students, inspired by NachOS, and is aimed at teaching OS concepts over a semester. Xinu is also mentioned as a potential resource. Minix, an educational OS, has a recent version available, and additional documentation on OS development can be found at osdever.net. For those interested in assembly language, the dex minidos project and a 512-byte OS competition with source code are also recommended. The OS development forum offers further community support and resources.
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I am presently learning operating system fundamentals.

Can anyone tell me m from where I can get free very small operating system code, in order to understand how it basically works?

It will be big help...(Please exclude Linux :))

Thanks in anticipation/
 
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jainabhs said:
I am presently learning operating system fundamentals.

Can anyone tell me m from where I can get free very small operating system code, in order to understand how it basically works?

It will be big help...(Please exclude Linux :))

Thanks in anticipation/

I remember in my OS course we used a simulator from Brown University i think which allowed you to load an OS's kernel on top. For that class we were using a kernel written by a professor at my university. The assignments involved coding portions of the kernel that were intentionally left out.

The Brown Simulator:
http://www.cs.brown.edu/software/brownsim/

The Kernel is here:
http://www.engr.uconn.edu/~kishori/Project/ucosStudents.tgz
Though if i remeber it is password protected, and it since it has missing portions it wouldn't really function very well.
 
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http://www.tinyos.net/

I've only heard about it; I haven't tried to use it. But this might be what you're looking for.
 
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OS/161 is designed to teach undergraduate students about operating systems over four months. That's what they used to teach me in third-year. I honestly don't know if it's still good to learn from without a lecturer.

http://www.eecs.harvard.edu/syrah/os161/

It's inspired by, but not based off of, NachOS, which is also meant to be instructional.

http://www.cs.washington.edu/homes/tom/nachos/

They are sort of hard to set up in the first place (or were when I used them).

I've also heard of Xinu:

http://www.cs.purdue.edu/homes/dec/xsoft.html
 
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