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1 <!doctype html> 2 <html lang="en"> 3 <head> 4 <meta charset="utf-8"> 5 <meta name="viewport" content="width=device-width, initial-scale=1"> 6 <title>PR#6 - Chris Bracken</title> 7 <link href="/css/site.css" rel="stylesheet"> 8 <link rel="apple-touch-icon" sizes="180x180" href="/favicon/apple-touch-icon.png"> 9 <link rel="icon" type="image/png" sizes="32x32" href="/favicon/favicon-32x32.png"> 10 <link rel="icon" type="image/png" sizes="16x16" href="/favicon/favicon-16x16.png"> 11 <link rel="manifest" href="/favicon/site.webmanifest"> 12 <link rel="mask-icon" href="/favicon/safari-pinned-tab.svg" color="#140f42"> 13 <link rel="shortcut icon" href="/favicon/favicon.ico"> 14 <meta name="msapplication-TileColor" content="#603cba"> 15 <meta name="msapplication-config" content="/favicon/browserconfig.xml"> 16 <meta name="theme-color" content="#ffffff"> 17 </head> 18 <body> 19 <header id="header"> 20 <div class="site-title"> 21 <h1><a href="/">Chris Bracken</a></h1> 22 </div> 23 24 <nav class="site-navbar"> 25 <ul id="menu" class="menu"> 26 <li class="menu-item"><a class="menu-item-a" href="/">Home</a></li> 27 <li class="menu-item"><a class="menu-item-a" href="/about/">About</a></li> 28 <li class="menu-item"><a class="menu-item-a" href="/code/">Code</a></li> 29 <li class="menu-item"><a class="menu-item-a" rel="me"href="https://bsd.network/@cbracken">Fediverse</a></li> 30 </ul> 31 </nav> 32 </header> 33 <main id="main"> 34 <article> 35 <h2 class="post-title"><a href="https://chris.bracken.jp/2007/06/pr6/">PR#6</a></h2> 36 06 June 2007 37 <p>According to <a href="http://apple.slashdot.org/article.pl?sid=07/06/06/0028246">Slashdot</a>, this month the <a href="https://en.wikipedia.org/wiki/Apple_II">Apple 38 II</a> turns 30. It was in production for 18 of those 30 years, 39 which likely makes it the longest-selling personal computer of all time. It was 40 the computer I wrote my first program on, and spent countless hours banging in 41 and editing code from <em>Compute</em> magazine—including page after page of raw hex 42 code when a program included graphics.</p> 43 <p>In tribute, I ran a Google search on PR#6 to see what turned up. For those who 44 don’t know or don’t remember, PR#6 was the command that kicked off the 45 bootloader code for slot 6, the drive controller. The search turned up two 46 relevant links: an <a href="http://docs.info.apple.com/article.html?artnum=197&coll=ap">Apple TechTip</a> on a simple copy-protection scheme, 47 and a fantastic <a href="http://diveintomark.org/archives/2006/08/22/c600g">blog entry</a> that covers a bit about the Apple 48 ][’s boot process, which brings back a lot of memories of old Shugart drives, 49 including the terrifying sound of a track 0 seek – a process wherein the drive 50 head was moved across the disk very quickly until it physically couldn’t go any 51 further, resulting in a loud alarm-like buzz from the drive when it hit the 52 limit of its reach.</p> 53 <p>Anyway, in celebration of the Apple ][’s 30th birthday, I recommend grabbing 54 your nearest <a href="https://www.scullinsteel.com/apple2/#dos33master">emulator</a>, and banging in a <code>call -151</code> for old time’s 55 sake.</p> 56 <figure><img src="/post/2007-06-06-happy_birthday.png" 57 alt="AppleSoft BASIC program"> 58 </figure> 59 60 </article> 61 </main> 62 63 <footer id="footer"> 64 <div class="copyright"> 65 <span xmlns:dct="http://purl.org/dc/terms/" xmlns:cc="http://creativecommons.org/ns#"> 66 The content of this site by 67 <a rel="cc:attributionURL" href="https://chris.bracken.jp/about"><span rel="cc:attributionName">Chris Bracken</span></a> 68 is 69 <a href="https://creativecommons.org/licenses/by/4.0">CC BY 4.0</a>. 70 </span> 71 </div> 72 </footer> 73 </body> 74 </html>