OSDev.org

Where can I find some operating systems' sources (nasm) ?

I severly doubt you'll find too many operating systems written exclusively in assembly.  It's simply too time consuming.

SkyOS, however, IIRC is written 100% in assembly (and is quite impressive, too!).  I don't recall if the sources are downloadable, however.

In any event, there are two links at the top of this page you'll see; OSDev Ring and Links.  Either one will point you in the direction of the vast majority of operating systems available on the internet.  In fact, I don't think you'll find a better list anywhere.

Cheers,
Jeff

Hi Tim,

just "google" for "+JeffOS +os", then you will find a small, simple and rudimentary os with sources. The code is really easy to understand.

Rene

You could also take a look at Menuet OS. It is a 32 bit multi-tasking OS written in asm. I am not sure if it was built with nasm, but it is a complete OS with source. It has a windowing GUI that can run at upto 1280x1024x32, fits on a single floppy, and even includes a minimal text editor and assembler that run native on the OS.

You can find it at www.menuetos.org

I'm looking for that too, but all Google gives me are dead links.