<story><title>Photos of Roger Penrose’s journal</title><url>https://abakcus.com/directory/roger-penroses-beautiful-journal/</url></story><parent_chain></parent_chain><comment><author>greenyoda</author><text>The first image contains some programs written for a Commodore P50 programmable calculator. Information about this device from 1978, including a photo, can be seen here:&lt;p&gt;&lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.arithmomuseum.com&amp;#x2F;album.php?cat=c&amp;amp;id=246&amp;amp;lang=en&quot; rel=&quot;nofollow noreferrer&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.arithmomuseum.com&amp;#x2F;album.php?cat=c&amp;amp;id=246&amp;amp;lang=en&lt;/a&gt;</text></comment>
<story><title>Photos of Roger Penrose’s journal</title><url>https://abakcus.com/directory/roger-penroses-beautiful-journal/</url></story><parent_chain></parent_chain><comment><author>bmitc</author><text>What is the source of these journal photos? I would love to see more.</text></comment>