{"id":35,"date":"2015-09-09T21:50:44","date_gmt":"2015-09-09T21:50:44","guid":{"rendered":"http:\/\/www.junofirst.com\/?p=35"},"modified":"2015-09-09T21:50:44","modified_gmt":"2015-09-09T21:50:44","slug":"reverse-engineering-robotron-on-a-bootleg-defender-pcb","status":"publish","type":"post","link":"http:\/\/www.junofirst.com\/?p=35","title":{"rendered":"Reverse Engineering Robotron on a bootleg Defender pcb."},"content":{"rendered":"<p><a href=\"http:\/\/www.junofirst.com\/wp-content\/uploads\/2015\/09\/image.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-36\" src=\"http:\/\/www.junofirst.com\/wp-content\/uploads\/2015\/09\/image-300x224.jpg\" alt=\"image\" width=\"300\" height=\"224\" \/><\/a><\/p>\n<p>This little pcb was created by Radich Electronics back in the day to convert a bootleg defender boardset into a Robotron boardset.<\/p>\n<p>But where is the Special chip 1 pair you say? All the TTL logic above the roms implement the blitter chips. In a attempt to prevent copying they have sanded off all the identifying labels.. even underneath the chips!<\/p>\n<p>Fortunately nowadays we have chip testers that can identify any TTL chips, so I am currently labourously desoldering and identifying each chip. Next step is to scan the pcb and make a net list to create a schematic. There are tools out here to assist with reverse engineering but they are all expensive, or require paying someone else to do the work.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This little pcb was created by Radich Electronics back in the day to convert a bootleg defender boardset into a Robotron boardset. But where is the Special chip 1 pair you say? All the TTL logic above the roms implement the blitter chips. In a attempt to prevent copying they have sanded off all the &hellip; <a href=\"http:\/\/www.junofirst.com\/?p=35\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Reverse Engineering Robotron on a bootleg Defender pcb.<\/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":[4,5,3],"tags":[9,7,8,6],"class_list":["post-35","post","type-post","status-publish","format-standard","hentry","category-arcade","category-electronics","category-reverse-engineering","tag-defender","tag-reverse-engineering","tag-robotron","tag-williams"],"_links":{"self":[{"href":"http:\/\/www.junofirst.com\/index.php?rest_route=\/wp\/v2\/posts\/35","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.junofirst.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.junofirst.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.junofirst.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.junofirst.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=35"}],"version-history":[{"count":1,"href":"http:\/\/www.junofirst.com\/index.php?rest_route=\/wp\/v2\/posts\/35\/revisions"}],"predecessor-version":[{"id":37,"href":"http:\/\/www.junofirst.com\/index.php?rest_route=\/wp\/v2\/posts\/35\/revisions\/37"}],"wp:attachment":[{"href":"http:\/\/www.junofirst.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=35"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.junofirst.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=35"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.junofirst.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=35"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}