The reference to the octal format (2-3-3) of the instructions is to this document:<p><a href="http:&#x2F;&#x2F;reocities.com&#x2F;SiliconValley&#x2F;heights&#x2F;7052&#x2F;opcode.txt" rel="nofollow">http:&#x2F;&#x2F;reocities.com&#x2F;SiliconValley&#x2F;heights&#x2F;7052&#x2F;opcode.txt</a><p>If you&#x27;re at all interested in the x86 architecture, it&#x27;s highly recommended reading.<p>(This used to be one of the first search results for &quot;x86 octal instructions&quot;. Now it&#x27;s nowhere in the first 10 <i>pages</i> of results and searching for its link directly doesn&#x27;t even cause it to appear. What happened, Google...?)