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Date: Fri, 24 May 2013 17:18:39 -0500
From: Joshua Isom <jrisom@gmail.com>
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To: Brian Reichert <reichert@numachi.com>
Subject: Re: Writing a (BSD like) Operating Systems From Scratch
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Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>,
 "Julian H. Stacey" <jhs@berklix.com>, "Welcome, Traiano" <welcomet@amazon.com>
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On 5/24/2013 1:33 PM, Brian Reichert wrote:
> On Fri, May 24, 2013 at 04:57:44PM +0000, Welcome, Traiano wrote:
>> Hi Julian
>>
>>   Thanks, any response is appreciated, here's mine:
>
> I typed into Google: "how to write an OS", and got lots of hits.
> Have you explored them?
>
> 	http://www.acm.uiuc.edu/sigops/roll_your_own/
>
> 	http://mikeos.berlios.de/write-your-own-os.html
>
> 	http://stackoverflow.com/questions/254149/how-do-you-write-a-basic-operating-system
>
>

Might I also recommend Contiki.  I've never used it, but an existing, 
compact, full featured OS should be a good place to start.