{"id":1249,"date":"2017-10-02T21:45:28","date_gmt":"2017-10-02T20:45:28","guid":{"rendered":"http:\/\/www.randomorbit.co.uk\/?p=1249"},"modified":"2017-10-02T21:45:28","modified_gmt":"2017-10-02T20:45:28","slug":"retrochallenge-201710-and-the-beat-goes-on","status":"publish","type":"post","link":"https:\/\/www.randomorbit.co.uk\/?p=1249","title":{"rendered":"RetroChallenge 2017\/10 \u2013 and the beat goes on"},"content":{"rendered":"<p>Yesterday I checked the voltages with my DMV and everything looked OK. Today I checked with the &#8216;scope just to check for ripple and they all look pretty clean to me.<\/p>\n<h2>Clocks<\/h2>\n<p>I also saw that there was a running clock but overnight I became increasing worried that it wasn&#8217;t a very good clock.<\/p>\n<p>Here&#8217;s the circuit&#8230; <a href=\"http:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_182341.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-1248 alignright\" src=\"http:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_182341-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_182341-300x225.jpg 300w, https:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_182341-768x576.jpg 768w, https:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_182341-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>It doesn&#8217;t look too tricky.<\/p>\n<h2>Check with the scope.<\/h2>\n<p><a href=\"http:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_181150.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-1247\" src=\"http:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_181150-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_181150-300x225.jpg 300w, https:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_181150-768x576.jpg 768w, https:\/\/www.randomorbit.co.uk\/wordpress\/wp-content\/uploads\/2017\/10\/20171002_181150-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>A scope trace shows it&#8217;s a bit funny. I&#8217;m not sure quite what the Z80 needs but I thought it should have a better back edge than that.<\/p>\n<p>More thought needed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yesterday I checked the voltages with my DMV and everything looked OK. Today I checked with the &#8216;scope just to check for ripple and they all look pretty clean to me. Clocks I also saw that there was a running clock but overnight I became increasing worried that it wasn&#8217;t a very good clock. Here&#8217;s &hellip; <a href=\"https:\/\/www.randomorbit.co.uk\/?p=1249\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">RetroChallenge 2017\/10 \u2013 and the beat goes on<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[47,129,33,98,127],"tags":[],"class_list":["post-1249","post","type-post","status-publish","format-standard","hentry","category-c93-blog-posts","category-nascom-1","category-c84-retro-tech","category-retrochallenge","category-retrochallenge-201710"],"featured_image_src":null,"author_info":{"display_name":"andy","author_link":"https:\/\/www.randomorbit.co.uk\/?author=1"},"_links":{"self":[{"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1249","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1249"}],"version-history":[{"count":1,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1249\/revisions"}],"predecessor-version":[{"id":1250,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1249\/revisions\/1250"}],"wp:attachment":[{"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}