<div dir="ltr"><div class="gmail_default"><font face="arial, helvetica, sans-serif" size="4">Ray,</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" size="4"><br></font></div><div class="gmail_default" style="text-align:justify"><font face="arial, helvetica, sans-serif" size="4">I think a much better place to start is<span style="color:rgb(0,0,0);text-align:justify"> John Lion's “<a href="https://en.wikipedia.org/wiki/Lions%27_Commentary_on_UNIX_6th_Edition,_with_Source_Code">A commentary on the Sixth Edition UNIX Operating System</a>” - available for download at: </span><font color="#000000"><a href="http://www.lemis.com/grog/Documentation/Lions/">Grog's Lions web page</a> or purchase a copy at: <a href="https://www.amazon.com/Lions-Commentary-Unix-John/dp/1573980137">Amazon - Lions book</a> This is for the PDP-11, will run on simh just fine, all the sources, comments et al are all there. </font></font><span style="color:rgb(51,51,51);font-family:arial,helvetica,sans-serif;font-size:large">The Lion's text is an clean, interesting, and accessible piece of work.</span></div><div class="gmail_default" style="text-align:justify"><font face="arial, helvetica, sans-serif" size="4"><font color="#000000"><br></font></font></div><div class="gmail_default" style="text-align:justify"><font face="arial, helvetica, sans-serif" size="4"><font color="#000000">What is even more cool in my opinion is we can also </font><span style="color:rgb(51,51,51)">point you to the MIT Undergrad course from the fall of 2014 called: Operating Systems Engineering [aka MIT's 6.828].</span></font></div><font face="arial, helvetica, sans-serif" size="4"><br style="color:rgb(51,51,51)"><span style="color:rgb(51,51,51)">All of docs and code are downloadable to read and work. The course is a modern redux on <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">the same</div> Lion's book from the late 1970s<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> for 40 years later and fresh</div>. The new MIT version is also, as someone else called it "a modern take on a classic" the URL: </span><span class="gmail-qlink_container" style="color:rgb(51,51,51)"><a href="http://pdos.csail.mit.edu/6.828/2014/xv6.html" rel="noopener" target="_blank" class="external_link" style="background-position:100% 0.3em;background-size:10.5px;background-repeat:no-repeat;background-origin:initial;background-clip:initial;background-color:initial;text-decoration:none;color:rgb(43,109,173);padding-right:15px">6.828 / Fall 2014</a></span><br style="color:rgb(51,51,51)"><br style="color:rgb(51,51,51)"><span style="color:rgb(51,51,51)">The latest xv6 source is available via</span><br style="color:rgb(51,51,51)"><span style="color:rgb(51,51,51)"> git clone </span><span class="gmail-qlink_container" style="color:rgb(51,51,51)"><a href="http://git//pdos.csail.mit.edu/xv6/xv6.git" rel="noopener nofollow" target="_blank" class="external_link" style="background-position:100% 0.3em;background-size:10.5px;background-repeat:no-repeat;background-origin:initial;background-clip:initial;background-color:initial;text-decoration:none;color:rgb(43,109,173);padding-right:15px">git://pdos.csail.mit.edu/<wbr>xv6/xv6.git</a></span></font></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Oct 22, 2016 at 1:21 PM, Ray Jewhurst <span dir="ltr"><<a href="mailto:raywjewhurst@gmail.com" target="_blank">raywjewhurst@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">I know some of the code is already there but I need comments since I am not an expert or even a real advanced programmer in assembly. Also, the beauty of running a simulator is that hardware resources are not as much of a problem so I more to fill in the gaps for the stuff I am unsure of. My personal assembly "bible " covers some systems programming but not all. I will have to share the title of the book when I am near it. It is available on Amazon. What my plans are is to make a simple OS with a dual command set using both the RT-11 command line interface and RSX style DCL. Just something fun to play with....</p><div class="HOEnZb"><div class="h5">
<div class="gmail_extra"><br><div class="gmail_quote">On Oct 22, 2016 11:58 AM, "Johnny Billquist" <<a href="mailto:bqt@softjar.se" target="_blank">bqt@softjar.se</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 2016-10-22 16:44, Ray Jewhurst wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I know that RT-11 is under license from Mentec but is there a way to get<br>
the sources for it? I would like preferably v5.3. I have an idea for<br>
project to teach my self rudimentary OS design and I would like to use<br>
RT-11 as an example since PDP-11 assembly is the only assembly I know<br>
and I am already comfortable with RT-11.<br>
</blockquote>
<br>
Unless I'm confused, RT-11 already comes with some sources, but they are stripped of comments.<br>
<br>
Also, as an OS, it is rather rudimentary. And the code is sometimes not that easy to follow, since they have used a lot of tricks to squeeze the most functionality with the minimal amount of memory use.<br>
<br>
Johnny<br>
<br>
-- <br>
Johnny Billquist || "I'm on a bus<br>
|| on a psychedelic trip<br>
email: <a href="mailto:bqt@softjar.se" target="_blank">bqt@softjar.se</a> || Reading murder books<br>
pdp is alive! || tryin' to stay hip" - B. Idol<br>
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