<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, sans-serif;"><div>Clem,</div><div><br></div><div>Thanks for the reference to the Dijkstra paper.</div><div>I had my electrical engineering education at the THE 1968-1974 and our introduction to programming class</div><div>was taught by Dijkstra himself. Of course our exercises had to be programmed in Algol68 and run on the EL-X8</div><div>system described in the paper (entering programs on paper tape with a flexowriter).</div><div>Interesting to read how ‘small’ the machine was in terms of memory and mass storage.</div><div>The actual machine consisted of several cabinets.</div><div><br></div><div>Apologies for the off-topic post.</div><div><br></div><div>Ton van Overbeek</div><div><br></div><span id="OLK_SRC_BODY_SECTION"><div style="font-family:Calibri; font-size:11pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt"><span style="font-weight:bold">From: </span> Clem Cole <<a href="mailto:clemc@ccc.com">clemc@ccc.com</a>><br><span style="font-weight:bold">Date: </span> Sunday 8 March 2015 21:39<br><span style="font-weight:bold">To: </span> Sergey Oboguev <<a href="mailto:oboguev@yahoo.com">oboguev@yahoo.com</a>><br><span style="font-weight:bold">Cc: </span> "<a href="mailto:simh@trailing-edge.com">simh@trailing-edge.com</a>" <<a href="mailto:simh@trailing-edge.com">simh@trailing-edge.com</a>><br><span style="font-weight:bold">Subject: </span> Re: [Simh] Regarding "Cutler THE father of VMS" myth<br></div><div><br></div><div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Mar 8, 2015 at 8:23 AM, Sergey Oboguev <span dir="ltr"><<a href="mailto:oboguev@yahoo.com" target="_blank">oboguev@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">If so, he may have a claim to inventing (a hint at) a microkernel concept. ;-)</blockquote></div><br><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Dykstra invented the ukernel -- its the THE kernel: <a href="https://en.wikipedia.org/wiki/THE_multiprogramming_system">https://en.wikipedia.org/wiki/THE_multiprogramming_system</a></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The paper itself is <a href="http://uosis.mif.vu.lt/~liutauras/books/Dijkstra%20-%20The%20structure%20of%20the%20THE%20multiprogramming%20system.pdf">http://uosis.mif.vu.lt/~liutauras/books/Dijkstra%20-%20The%20structure%20of%20the%20THE%20multiprogramming%20system.pdf</a></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">And all kernel hacker should read it some time. It where the idea of semaphores are defined and the idea of "up" and "down" - (aka P/V).</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Clem</div><br></div></div>
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