{"id":1765,"date":"2014-10-23T22:23:07","date_gmt":"2014-10-23T20:23:07","guid":{"rendered":"https:\/\/zz-indigo.mavipet.sk\/?p=1765"},"modified":"2019-10-29T18:04:49","modified_gmt":"2019-10-29T18:04:49","slug":"novy-projekt-zz81","status":"publish","type":"post","link":"https:\/\/zz-indigo.mavipet.sk\/?p=1765","title":{"rendered":"Nov\u00fd projekt ZZ81"},"content":{"rendered":"

V pominut\u00ed mysle som si na Ebay k\u00fapil „SBC kit“ v zlo\u017een\u00ed Z80 CPU, 32K EEPROM a 32k RAM. Pri\u010dom p\u00e1r t\u00fd\u017ed\u0148ov pred t\u00fdm som sa podobn\u00fdch vec\u00ed zbavil.\u00a0 A ke\u010f\u017ee som to e\u0161te roz\u0161\u00edril o AY-3-8912 mi u\u017e neost\u00e1valo ni\u010d in\u00e9 ako nie\u010do z toho sp\u00e1cha\u0165. A \u010do in\u00e9 ako ZX81. M\u00e1m u\u017e FPGA verziu, origin\u00e1lnu verziu tak pre\u010do nie nejak\u00fd klon \ud83d\ude09<\/p>\n

<\/p>\n

Klon sa vol\u00e1 ZZ81 a obsahuje okrem vy\u0161\u0161ie spom\u00ednan\u00fdch komponentov e\u0161te MAX7128 ktor\u00fd nahradzuje p\u00f4vodn\u00fa ULA. Po cca mesiaci \u010dakania PCB dorazilo.<\/p>\n

\"ZZ81<\/a>Tak\u017ee m\u00e1m \u00ed zatia\u013e zbyto\u010dn\u00fdch. A jednu osaden\u00fa, zatia\u013e z oscil\u00e1torom na zlej frekvencii:<\/p>\n

\"ZZ81<\/a>Na doske nieje vyveden\u00fd JTAG konektor ale len test piny,\u00a0 Na programovanie teda pou\u017e\u00edvam pr\u00edpravok z pogo pinmi.<\/p>\n

\"Pripojenie<\/a>Bohu\u017eia\u013e u\u017e som na\u0161iel aj jednu chybu PCB. Ktor\u00e1 znemo\u017e\u0148ovala \u010d\u00edtanie z ROM po\u010das refresh cyklu (Vyu\u017e\u00edvaju ZX81). Na\u0161\u0165astie oprava je jednoduch\u00e1:<\/p>\n

\"ZZ81<\/a>Status: Aktu\u00e1lne je v CPLD implementovan\u00e1 CS logika pre ROM,RAM, AY. Okrem toho CPLD st\u00e1le posiela CPU in\u0161trukciu NOP.<\/p>\n","protected":false},"excerpt":{"rendered":"

V pominut\u00ed mysle som si na Ebay k\u00fapil „SBC kit“ v zlo\u017een\u00ed Z80 CPU, 32K EEPROM a 32k RAM. Pri\u010dom p\u00e1r t\u00fd\u017ed\u0148ov pred t\u00fdm som sa podobn\u00fdch vec\u00ed zbavil.\u00a0 A ke\u010f\u017ee som to e\u0161te roz\u0161\u00edril o AY-3-8912 mi u\u017e neost\u00e1valo … Pokra\u010dova\u0165 v \u010d\u00edtan\u00ed →<\/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":[3,5,6,13,14],"tags":[],"class_list":["post-1765","post","type-post","status-publish","format-standard","hentry","category-hw-a-sw","category-ostatne","category-projekty","category-zx81","category-zz81"],"_links":{"self":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/1765","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=1765"}],"version-history":[{"count":1,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/1765\/revisions"}],"predecessor-version":[{"id":2060,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/1765\/revisions\/2060"}],"wp:attachment":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}