{"id":37569,"date":"2024-11-01T15:03:39","date_gmt":"2024-11-01T19:03:39","guid":{"rendered":"https:\/\/ckms.ca\/?p=37569"},"modified":"2024-11-01T15:05:27","modified_gmt":"2024-11-01T19:05:27","slug":"how-i-can-tell-my-meory-is-fading","status":"publish","type":"post","link":"https:\/\/blog.ckms.ca\/?p=37569","title":{"rendered":"how i can tell my memory is fading&#8230;"},"content":{"rendered":"\n<p>examples.  in <a href=\"https:\/\/blog.ckms.ca\/?p=18994\" data-type=\"post\" data-id=\"18994\" target=\"_blank\" rel=\"noreferrer noopener\">reverse cron<\/a>, of course.<\/p>\n\n\n\n<p>&#8212; 2024-11-01 &#8211; Friday &#8211; any time I see videos or articles on old hardware, like PC\/XT era, I try to recall the command used in DEBUG.EXE to start the &#8220;low-level&#8221; format on MFM controllers.  Videos like this from Dave&#8217;s Garage.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"How To: Formatting the Ancient Hard Drive in a PDP-11\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/FOONsywfj-w?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption>Dave&#8217;s Garage &#8211; How To: Formatting the Ancient Hard Drive in a PDP-11<\/figcaption><\/figure>\n\n\n\n<p><br>to which I added a comment:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Quick quiz: who recall the DEBUG command to start the MFM low-level format on a PC? I guessed wrong, but was close. Must be getting old<\/p><\/blockquote>\n\n\n\n<p>I guessed <strong>g c800:0<\/strong>, should be <strong>g=c800:5<\/strong>, which the MFM controller would be address as (by jumpers or switches, as the good lord intended!)<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/how-i-gauge-my-memory-low-debug-mfm-drives-2024-11-01_14-44-45.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/how-i-gauge-my-memory-low-debug-mfm-drives-2024-11-01_14-44-45-979x1024.jpg\" alt=\"\" class=\"wp-image-37571\" width=\"634\" height=\"663\" srcset=\"https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/how-i-gauge-my-memory-low-debug-mfm-drives-2024-11-01_14-44-45-979x1024.jpg 979w, https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/how-i-gauge-my-memory-low-debug-mfm-drives-2024-11-01_14-44-45-287x300.jpg 287w, https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/how-i-gauge-my-memory-low-debug-mfm-drives-2024-11-01_14-44-45-768x803.jpg 768w, https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/how-i-gauge-my-memory-low-debug-mfm-drives-2024-11-01_14-44-45-675x706.jpg 675w, https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/how-i-gauge-my-memory-low-debug-mfm-drives-2024-11-01_14-44-45.jpg 1151w\" sizes=\"auto, (max-width: 634px) 100vw, 634px\" \/><\/a><\/figure><\/div>\n\n\n\n<p>an MFM controller card (for an AT-class machine, given the 16-bit ISA slot); the addressing jumpers are probably the pin jumpers down near the notch in the ISA edge.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/mfm-controller-pc-xt-2024-11-01_14-59-49.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/mfm-controller-pc-xt-2024-11-01_14-59-49-1024x555.jpg\" alt=\"\" class=\"wp-image-37572\" width=\"618\" height=\"335\" srcset=\"https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/mfm-controller-pc-xt-2024-11-01_14-59-49-1024x555.jpg 1024w, https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/mfm-controller-pc-xt-2024-11-01_14-59-49-300x163.jpg 300w, https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/mfm-controller-pc-xt-2024-11-01_14-59-49-768x416.jpg 768w, https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/mfm-controller-pc-xt-2024-11-01_14-59-49-1226x665.jpg 1226w, https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/mfm-controller-pc-xt-2024-11-01_14-59-49-675x366.jpg 675w, https:\/\/blog.ckms.ca\/wp-content\/uploads\/2024\/11\/mfm-controller-pc-xt-2024-11-01_14-59-49.jpg 1503w\" sizes=\"auto, (max-width: 618px) 100vw, 618px\" \/><\/a><\/figure><\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>examples. in reverse cron, of course. &#8212; 2024-11-01 &#8211; Friday &#8211; any&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[282],"tags":[342,1657,1149],"class_list":["post-37569","post","type-post","status-publish","format-standard","hentry","category-article","tag-computers","tag-how-i","tag-memory","wpcat-282-id"],"_links":{"self":[{"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=\/wp\/v2\/posts\/37569","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=37569"}],"version-history":[{"count":4,"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=\/wp\/v2\/posts\/37569\/revisions"}],"predecessor-version":[{"id":37576,"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=\/wp\/v2\/posts\/37569\/revisions\/37576"}],"wp:attachment":[{"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=37569"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=37569"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.ckms.ca\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=37569"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}