{"id":1648,"date":"2014-09-07T00:10:35","date_gmt":"2014-09-06T22:10:35","guid":{"rendered":"https:\/\/zz-indigo.mavipet.sk\/?p=1648"},"modified":"2019-10-29T18:04:50","modified_gmt":"2019-10-29T18:04:50","slug":"zx81zx80-composite-video-backporch","status":"publish","type":"post","link":"https:\/\/zz-indigo.mavipet.sk\/?p=1648","title":{"rendered":"ZX81\/ZX80 Composite video, backporch. (upraveny)"},"content":{"rendered":"<p>Ako som p\u00edsal potrebujem composite zo ZX81 a nem\u00e1m ULA-u ktor\u00e1 rob\u00ed backporch. Tak som si robil mal\u00fd prieskum mo\u017en\u00fdch rie\u0161en\u00ed. Pre istotu som vysk\u00fa\u0161al \u010di mi nebude sta\u010di\u0165 upravi\u0165 len nap\u00e4\u0165ov\u00fa \u00farove\u0148 a \u017eiaden z mojich monitorov sa nerozhodol zobrazova\u0165 pre neexistenciu backporchu. Tak a teraz moje zistenia:<\/p>\n<p><!--more--><\/p>\n<p>Ke\u010f\u017ee m\u00e1m FPGA verziu ZX80 a ZX81 o backporch probl\u00e9me viem a aj o niektor\u00fdch rie\u0161eniach tohto probl\u00e9mu. Ako prv\u00e9 k \u010domu som sa dostal e\u0161te ke\u010f som tento probl\u00e9m rie\u0161il vo FPGA:<\/p>\n<p><a href=\"http:\/\/www.fruitcake.plus.com\/Sinclair\/ZX80\/VideoGeneration\/ZX80_BackPorchGeneration.htm\">Backporch gener\u00e1tor za pomoci M1 sign\u00e1lu<\/a>. Na\u0148 som pri\u0161iel v\u010faka <a href=\"http:\/\/www.8bity.cz\/2011\/pcb-a-navod-pro-back-porch-genertor\/\">Martinovy<\/a>. Nev\u00fdhodou tohto rie\u0161enia je \u017ee backporch nieje generovan\u00fd v\u017edy rovnako. \u010eal\u0161ia nev\u00fdhoda je \u017ee rie\u0161enie potrebuje oddelen\u00fa synchroniz\u00e1ciu a video. p.s. Vo FPGA generujem backporch na z\u00e1klade po\u010ditadla NMI gener\u00e1tora.<\/p>\n<p><a href=\"http:\/\/searle.hostei.com\/grant\/zx80\/zx80.html\">White level restoration od Granta Searle<\/a>. \u010cas\u0165 <b>: ZX81 Conversion. Jeho rie\u0161enie je tak\u00e9 \u017ee po skon\u010den\u00fd sync pulzu nejak\u00fd \u010das\u0165, ur\u010den\u00fd RC \u010dlenom, posiela namiesto generovan\u00e9ho videa \u010diernu. bohu\u017eia\u013e aj toto rie\u0161enie je ur\u010den\u00e9 pre ZX80 a vy\u017eaduje oddelen\u00fd sync sign\u00e1l. Ale d\u00e1va lep\u0161ie v\u00fdsledky ako gener\u00e1tor z pomocou M1<\/b><\/p>\n<p>Na\u0161iel som aj rie\u0161enie ktor\u00e9 vyu\u017e\u00edva separ\u00e1tor sync separ\u00e1tor LM1881. Ktor\u00fd som aj mal ma\u0165 doma a nena\u0161iel som ho. V\u00fdhoda tohto rie\u0161enia je \u017ee tento obvod aj generuje sign\u00e1l backporch pre TV aby vedelo kedy ho m\u00e1 \u010daka\u0165. na\u0161iel som ale len sch\u00e9my prototypu <a href=\"http:\/\/forum.tlienhard.com\/TS1000\/homepage.ntlworld.com\/deborah.clayton1\/pics\/zxvidmod.jpg\">1<\/a> a <a href=\"http:\/\/forum.tlienhard.com\/TS1000\/homepage.ntlworld.com\/deborah.clayton1\/pics\/zxvidmod3.jpg\">3<\/a>. Ako v\u00fdhoda vyzer\u00e1 to \u017ee rie\u0161enie obsahuje aj video zosil\u0148ova\u010d. Vyzera to \u017ee takto je rie\u0161eny <a href=\"http:\/\/www.sinclairzxworld.com\/new-product-zxvid-t628.html\">ZXvid<\/a><\/p>\n<p>Ke\u010f\u017ee video v\u00fdstup z ULA ma rozp\u00e4tie a\u017e 5V tak\u017ee by sa malo vcelku jednoduch\u00e9 rozozna\u0165 \u00farove\u0148 \u010diernej od sync. Toto vyu\u017e\u00edva napr\u00edklad tento <a href=\"http:\/\/www.user.dccnet.com\/wrigter\/index_files\/zxinverter.htm\">video invertor pre ZX81<\/a>.\u00a0Tu s\u00fa dve verzie jedna z CMOS logick\u00fdmi obvodmi. T\u00e1 pou\u017e\u00edva ve\u013emy zauj\u00edmav\u00fd sp\u00f4sob separ\u00e1cie. Ktor\u00fd pou\u017eiva <a href=\"http:\/\/www.sinclairzxworld.com\/viewtopic.php?f=8&amp;t=841&amp;start=20\">ZX8-CCB<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ako som p\u00edsal potrebujem composite zo ZX81 a nem\u00e1m ULA-u ktor\u00e1 rob\u00ed backporch. Tak som si robil mal\u00fd prieskum mo\u017en\u00fdch rie\u0161en\u00ed. Pre istotu som vysk\u00fa\u0161al \u010di mi nebude sta\u010di\u0165 upravi\u0165 len nap\u00e4\u0165ov\u00fa \u00farove\u0148 a \u017eiaden z mojich monitorov sa nerozhodol &hellip; <a href=\"https:\/\/zz-indigo.mavipet.sk\/?p=1648\">Pokra\u010dova\u0165 v \u010d\u00edtan\u00ed <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,13],"tags":[],"class_list":["post-1648","post","type-post","status-publish","format-standard","hentry","category-ostatne","category-zx81"],"_links":{"self":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/1648","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1648"}],"version-history":[{"count":1,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/1648\/revisions"}],"predecessor-version":[{"id":2648,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/1648\/revisions\/2648"}],"wp:attachment":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}