{"id":3161,"date":"2019-03-10T22:21:58","date_gmt":"2019-03-11T05:21:58","guid":{"rendered":"http:\/\/k6hr.com\/?p=3161"},"modified":"2023-01-22T17:04:49","modified_gmt":"2023-01-23T01:04:49","slug":"death-of-a-serial-port","status":"publish","type":"post","link":"http:\/\/k6hr.com\/index.php\/2019\/03\/10\/death-of-a-serial-port\/","title":{"rendered":"Death Of A JNOS Serial Port"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">That trace screen looks weird!<\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"http:\/\/k6hr.com\/wp-content\/uploads\/2019\/03\/DSC01164.jpg\" alt=\"JNOS Data Corruption\" class=\"wp-image-3160\" srcset=\"http:\/\/k6hr.com\/wp-content\/uploads\/2019\/03\/DSC01164.jpg 800w, http:\/\/k6hr.com\/wp-content\/uploads\/2019\/03\/DSC01164-300x225.jpg 300w, http:\/\/k6hr.com\/wp-content\/uploads\/2019\/03\/DSC01164-768x576.jpg 768w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><figcaption class=\"wp-element-caption\">JNOS Data Corruption<\/figcaption><\/figure>\n\n\n\n<p>JNOS has been online and on the air here for nearly 20 years. It runs on old Pentium D hardware under Ubuntu Linux 13.04. Old stuff, but it works. at least it did until recently.<\/p>\n\n\n\n<p>The first sign something was wrong, was an error message I hadn&#8217;t seen in many many years: bad header!<\/p>\n\n\n\n<p>At first I thought the TNC (an old Kantronics KPC-3) might have fallen out of KISS mode. In order for JNOS to communicate with the TNC it must be in KISS mode. I pulled the TNC out of service and performed a hardware reset to ensure the device was in KISS mode.<\/p>\n\n\n\n<p>Resetting the TNC did not resolve the issue. As the corruption continued, it was causing the JNOS BBS software to crash.<\/p>\n\n\n\n<p>I quickly discovered that disabling the serial device stopped the software from crashing. The next possibility was that the hardware serial port itself had gone bad. After plugging in a USB to Serial adapter and connecting the TNC on a different COM port the problem was solved.<\/p>\n\n\n\n<p>My mighty little JNOS BBS system is back online and back on the air (on 145.05) While I was at it I upgraded the Ubuntu PC RAM from 1GB to 4GB. There was an occasional console message reporting low memory or &#8216;out of space&#8217;  (JNOS parlance). That message has not occurred since.<\/p>\n\n\n\n<p>JNOS BBS:  Telnet to 44.16.2.46 and give it a try!<\/p>\n\n\n\n<p><a href=\"http:\/\/k6hr.com\">Back To The Front<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>That trace screen looks weird! JNOS has been online and on the air here for nearly 20 years. It runs on old Pentium D hardware under Ubuntu Linux 13.04. Old stuff, but it works. at least it did until recently. The first sign something was wrong, was an error message I hadn&#8217;t seen in many &hellip; <a href=\"http:\/\/k6hr.com\/index.php\/2019\/03\/10\/death-of-a-serial-port\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Death Of A JNOS Serial Port&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[12],"tags":[192,193,194,195],"class_list":["post-3161","post","type-post","status-publish","format-standard","hentry","category-whats-new","tag-jnos","tag-kantronics-kpc-3","tag-kpc-3","tag-tnc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Death Of A JNOS Serial Port - K6HR SDR Server 2026<\/title>\n<meta name=\"description\" content=\"K6HR SDR Server 2023 - 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