Well, the playfield is almost done!<\/p>\n
I’ve cleaned out the cabinet and head.
\nI’ve installed the new microswitch (#52) that let’s the machine know the ball is on the 2nd level playfield.
\nI’m still missing a few rubbers, but they are in the mail.
\nThe 20A fuse on the transformer box burned out while I was working on the playfield. I stuck a new one in and that burned out too. So I removed all the lights and measured the wiring to look for shorts. There were none. I stuck the lamps back in one by one and now everything works… Weird.<\/p>\n
The guy I bought the ZM1550 display modules from mailed me to say he is abroad for work and will send them next week.<\/p>\n
I still have the CPU board problem though… I’m going to swap out IC’s 8, 19, 31 and 37 for good measure. The way the CPU reacts to the DIP switch 4 position looks like it’s unable to read the settings once PROGR is off. When I put the switch back in PROGR mode, I can read all the settings, which to me means the RAM is good.
\nI’m also writing a extensive memory test program that will write alternative 0x55 and 0xAA’s to every memory position between 0x1800 and 0x1BFF. When a test fails it will show which test failed in which nibble at which location on the Player 1 display. This way I should be sure if the memory is good and I can test with both positions of DIP switch 4.<\/p>\n
I’ll keep you updated.<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Well, the playfield is almost done! I’ve cleaned out the cabinet and head. I’ve installed the new microswitch (#52) that let’s the machine know the ball is on the 2nd level playfield. I’m still missing a few rubbers, but they are in the mail. The 20A fuse on the transformer box burned out while I […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,3,46,37],"tags":[34,15,30,12,25,8,35,31,24,33],"class_list":["post-157","post","type-post","status-publish","format-standard","hentry","category-cabinet","category-electronics","category-pinball-champ","category-playfield-2","tag-cleaning","tag-cpu","tag-display","tag-electronics-2","tag-memory","tag-pinball-2","tag-playfield","tag-test-program","tag-zaccaria","tag-zm1550"],"_links":{"self":[{"href":"https:\/\/pinball.teta.be\/index.php?rest_route=\/wp\/v2\/posts\/157","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pinball.teta.be\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pinball.teta.be\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pinball.teta.be\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pinball.teta.be\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=157"}],"version-history":[{"count":2,"href":"https:\/\/pinball.teta.be\/index.php?rest_route=\/wp\/v2\/posts\/157\/revisions"}],"predecessor-version":[{"id":219,"href":"https:\/\/pinball.teta.be\/index.php?rest_route=\/wp\/v2\/posts\/157\/revisions\/219"}],"wp:attachment":[{"href":"https:\/\/pinball.teta.be\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pinball.teta.be\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pinball.teta.be\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}