{"id":1028,"date":"2016-08-10T20:29:16","date_gmt":"2016-08-11T01:29:16","guid":{"rendered":"http:\/\/paulcarbone.com\/blog\/?p=1028"},"modified":"2020-06-20T12:42:21","modified_gmt":"2020-06-20T17:42:21","slug":"heathkit-h89a-first-light","status":"publish","type":"post","link":"https:\/\/paulcarbone.com\/blog\/heathkit-h89a-first-light\/","title":{"rendered":"Heathkit H89A, First Light"},"content":{"rendered":"

Progress continues.\u00a0 I tested the regulators and they were fine.\u00a0 I ultimately traced the problem to C513.\u00a0 It was shorted, and has been replaced by a comparable ceramic cap.<\/p>\n

After bringing her up on a variac, I’m greeted with an H: prompt!<\/p>\n

I ran a memory test, which is one of the routines in the monitor ROM.\u00a0 A full test would take over 2 days, so I just let it run for a bit after quitting.<\/p>\n

\"IMG_6407\"<\/a><\/p>\n

377377 is 64K in octal.<\/p>\n

There’s a routine you can enter manually that prints characters to the screen:<\/p>\n

\"IMG_6410\"<\/a><\/p>\n

Finally, there’s a routine to run a drive speed test.\u00a0 Using a tweaker to adjust to 200:<\/p>\n

\"IMG_6424\"<\/a><\/p>\n

Unfortunately, I can’t get it to boot off any medium I have, either hard sectored on the built-in drive, or soft sectored using the external H77 drive.\u00a0 Not sure what to try next…<\/p>\n

\"IMG_6423\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Progress continues.\u00a0 I tested the regulators and they were fine.\u00a0 I ultimately traced the problem to C513.\u00a0 It was shorted, and has been replaced by a comparable ceramic cap. After bringing her up on a variac, I’m greeted with an … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1030,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[66],"tags":[57,54,58],"table_tags":[],"_links":{"self":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/1028"}],"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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/comments?post=1028"}],"version-history":[{"count":1,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/1028\/revisions"}],"predecessor-version":[{"id":1033,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/1028\/revisions\/1033"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/media\/1030"}],"wp:attachment":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/media?parent=1028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/categories?post=1028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/tags?post=1028"},{"taxonomy":"table_tags","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/table_tags?post=1028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}