{"id":1208,"date":"2020-05-13T08:22:53","date_gmt":"2020-05-13T13:22:53","guid":{"rendered":"https:\/\/paulcarbone.com\/blog\/?p=1208"},"modified":"2023-06-04T10:18:04","modified_gmt":"2023-06-04T15:18:04","slug":"tektronix-7854-continued-woes","status":"publish","type":"post","link":"https:\/\/paulcarbone.com\/blog\/tektronix-7854-continued-woes\/","title":{"rendered":"Tektronix 7854: Continued Woes"},"content":{"rendered":"<p>Well shit &#8211; it seems as though something <em>else<\/em> went wrong with this scope while I was slogging though the ROM problem.\u00a0 It&#8217;s not the display board.\u00a0 We&#8217;re not even getting to the point where that&#8217;s being checked.\u00a0 It seems to quickly go into this vegetative loop pretty much immediately.\u00a0 I put back the old (bad) ROMs to at least see if I could get the ROM error pattern again, but nothing &#8211; just all lights lit.<\/p>\n<p>Did some probing on the chip-select lines on the ROM card, and it&#8217;s clear that it&#8217;s going through some quick little loop, but it&#8217;s not always the <em>same <\/em>loop on each restart.\u00a0 I&#8217;m hoping to find a way to reset the CPU w\/o cycling power.\u00a0 I think I can short TP1200-1 to ground, but waiting for someone to confirm so I don&#8217;t invariably nuke something else.<\/p>\n<p>I confirmed that all power supply rails are spot-on.<\/p>\n<p>onward&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Well shit &#8211; it seems as though something else went wrong with this scope while I was slogging though the ROM problem.\u00a0 It&#8217;s not the display board.\u00a0 We&#8217;re not even getting to the point where that&#8217;s being checked.\u00a0 It seems &hellip; <a href=\"https:\/\/paulcarbone.com\/blog\/tektronix-7854-continued-woes\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"status","meta":[],"categories":[26],"tags":[64,27],"table_tags":[],"_links":{"self":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/1208"}],"collection":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/comments?post=1208"}],"version-history":[{"count":1,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/1208\/revisions"}],"predecessor-version":[{"id":1209,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/1208\/revisions\/1209"}],"wp:attachment":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/media?parent=1208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/categories?post=1208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/tags?post=1208"},{"taxonomy":"table_tags","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/table_tags?post=1208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}