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      4     <title>Retro on Chris Bracken</title>
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      6     <description>Recent content in Retro on Chris Bracken</description>
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     13       <title>PR#6</title>
     14       <link>https://chris.bracken.jp/2007/06/pr6/</link>
     15       <pubDate>Wed, 06 Jun 2007 00:00:00 +0000</pubDate>
     16       <author>chris@bracken.jp (Chris Bracken)</author>
     17       <guid>https://chris.bracken.jp/2007/06/pr6/</guid>
     18       <description>&lt;p&gt;According to &lt;a href=&#34;http://apple.slashdot.org/article.pl?sid=07/06/06/0028246&#34;&gt;Slashdot&lt;/a&gt;, this month the &lt;a href=&#34;https://en.wikipedia.org/wiki/Apple_II&#34;&gt;Apple
     19 II&lt;/a&gt; turns 30. It was in production for 18 of those 30 years,
     20 which likely makes it the longest-selling personal computer of all time. It was
     21 the computer I wrote my first program on, and spent countless hours banging in
     22 and editing code from &lt;em&gt;Compute&lt;/em&gt; magazine—including page after page of raw hex
     23 code when a program included graphics.&lt;/p&gt;
     24 &lt;p&gt;In tribute, I ran a Google search on PR#6 to see what turned up. For those who
     25 don&amp;rsquo;t know or don&amp;rsquo;t remember, PR#6 was the command that kicked off the
     26 bootloader code for slot 6, the drive controller. The search turned up two
     27 relevant links: an &lt;a href=&#34;http://docs.info.apple.com/article.html?artnum=197&amp;amp;coll=ap&#34;&gt;Apple TechTip&lt;/a&gt; on a simple copy-protection scheme,
     28 and a fantastic &lt;a href=&#34;http://diveintomark.org/archives/2006/08/22/c600g&#34;&gt;blog entry&lt;/a&gt; that covers a bit about the Apple
     29 ][&amp;rsquo;s boot process, which brings back a lot of memories of old Shugart drives,
     30 including the terrifying sound of a track 0 seek – a process wherein the drive
     31 head was moved across the disk very quickly until it physically couldn&amp;rsquo;t go any
     32 further, resulting in a loud alarm-like buzz from the drive when it hit the
     33 limit of its reach.&lt;/p&gt;
     34 &lt;p&gt;Anyway, in celebration of the Apple ][&amp;rsquo;s 30th birthday, I recommend grabbing
     35 your nearest &lt;a href=&#34;https://www.scullinsteel.com/apple2/#dos33master&#34;&gt;emulator&lt;/a&gt;, and banging in a &lt;code&gt;call -151&lt;/code&gt; for old time&amp;rsquo;s
     36 sake.&lt;/p&gt;
     37 &lt;figure&gt;&lt;img src=&#34;https://chris.bracken.jp/post/2007-06-06-happy_birthday.png&#34;
     38     alt=&#34;AppleSoft BASIC program&#34;&gt;
     39 &lt;/figure&gt;
     40 
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