{"id":3744,"date":"2013-01-19T22:51:26","date_gmt":"2013-01-20T03:51:26","guid":{"rendered":"http:\/\/www.willegal.net\/blog\/?p=3744"},"modified":"2013-01-19T23:04:07","modified_gmt":"2013-01-20T04:04:07","slug":"scelbi-things-to-be-aware-of-scelbi","status":"publish","type":"post","link":"http:\/\/www.willegal.net\/blog\/?p=3744","title":{"rendered":"SCELBI: things to be aware of SCELBI"},"content":{"rendered":"<p>As I layed out the PCBs and researched things SCELBI, I discovered several things that other SCELBI builders should be aware of.  I fully expect that other things will crop up, like they did during my Apple 1 and Apple II builds, but here are a few things that I know about already.<\/p>\n<li>Missing connection on +5 volts on DBB board\t&#8211; there is a missing +5V connection on the DBB board &#8211; add the wire between the resistors as seen on this image of an original DBB board<\/li>\n<div id=\"attachment_3748\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.willegal.net\/blog\/wp-content\/uploads\/2013\/01\/DBBbug.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3748\" src=\"http:\/\/www.willegal.net\/blog\/wp-content\/uploads\/2013\/01\/DBBbug-300x197.png\" alt=\"+5 volt wire on DBB board\" width=\"300\" height=\"197\" class=\"size-medium wp-image-3748\" srcset=\"http:\/\/www.willegal.net\/blog\/wp-content\/uploads\/2013\/01\/DBBbug-300x197.png 300w, http:\/\/www.willegal.net\/blog\/wp-content\/uploads\/2013\/01\/DBBbug.png 435w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-3748\" class=\"wp-caption-text\">+5 volt wire on DBB board<\/p><\/div>\n<li>I did find an error on the CPU Schematic.  The wires going to IC Z20 pins 12 and 8 are swapped on the schematic<\/li>\n<li>There is apparently a problem with the step switch.  This is described in the &#8220;Improving the Operation of the Step Switch &#8221; document, which can be found on <a href=\"http:\/\/www.olson-ndt.com\/Scelbi\/Schematics2\/\" title=\"http:\/\/www.olson-ndt.com\/Scelbi\/Schematics2\/\">this page<\/a>.  When I first looking at this issue, I thought I found some discrepancies between these instructions and the actual board layout, so perhaps this version of the DBB board already has a fix incorporated &#8211; or perhaps the instructions are wrong.  I have not seen an actual SCELBI with the fix applied<\/li>\n","protected":false},"excerpt":{"rendered":"<p>As I layed out the PCBs and researched things SCELBI, I discovered several things that other SCELBI builders should be aware of. I fully expect that other things will crop up, like they did during my Apple 1 and Apple &hellip; <a href=\"http:\/\/www.willegal.net\/blog\/?p=3744\">Continue reading <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":{"footnotes":""},"categories":[16,7],"tags":[],"class_list":["post-3744","post","type-post","status-publish","format-standard","hentry","category-8008-scelbi","category-apple"],"_links":{"self":[{"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3744","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3744"}],"version-history":[{"count":8,"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3744\/revisions"}],"predecessor-version":[{"id":3753,"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3744\/revisions\/3753"}],"wp:attachment":[{"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3744"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3744"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.willegal.net\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3744"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}