{"id":1566,"date":"2021-08-23T15:55:47","date_gmt":"2021-08-23T13:55:47","guid":{"rendered":"https:\/\/www.pmd85.cz\/?page_id=1566"},"modified":"2021-09-27T16:59:48","modified_gmt":"2021-09-27T14:59:48","slug":"barevny-modul-colorace64-8barev-pro-pmd-85-se-64kb-ram","status":"publish","type":"page","link":"https:\/\/www.pmd85.cz\/?page_id=1566","title":{"rendered":"Barevn\u00fd modul Colorace64 (8barev) pro PMD-85 se 64kB RAM"},"content":{"rendered":"

Autorem tohoto roz\u0161\u00ed\u0159en\u00ed pro po\u010d\u00edta\u010de PMD-85 je Ub880d, viz \u010dl\u00e1nek zde<\/a>. N\u00e1sledn\u011b vy\u0161lo pokra\u010dov\u00e1n\u00ed \u010dl\u00e1nku zde<\/a> a pozd\u011bj\u0161\u00ed variaci m\u016f\u017eete naj\u00edt i na str\u00e1nk\u00e1ch RM-Teamu<\/a>. Jinou cestou, ov\u0161em se stejn\u00fdmi v\u00fdsledky a 100% zp\u011btnou kompatibilitou, se dal Zden\u011bk6<\/a>.<\/p>\n

A jak toto za\u0159\u00edzen\u00ed funguje? Jeden bajt ve videoram nese u PMD-85 informaci o stavu \u0161esti sousedn\u00edch pixel\u016f (sv\u00edt\u00ed\/nesv\u00edt\u00ed), zb\u00fdvaj\u00edc\u00ed dva bity pak k\u00f3duj\u00ed jednu ze \u010dty\u0159 „barev“, spole\u010dnou pro rozsv\u00edcen\u00e9 pixely ze zm\u00edn\u011bn\u00e9 \u0161estice. Ta barva je v uvozovk\u00e1ch proto, \u017ee prvotn\u00ed modely PMD-85 ve spojen\u00ed s \u010dernob\u00edl\u00fdmi TVP Merkur nahrazovaly zm\u00edn\u011bn\u00e9 \u010dty\u0159i barvy kombinacemi polojasu a blik\u00e1n\u00ed. Nicm\u00e9n\u011b v\u0161echny modely PMD-85 mohou b\u00fdt po v\u011bt\u0161\u00edch \u010di men\u0161\u00edch \u00faprav\u00e1ch p\u0159inuceny k provozu se \u010dty\u0159barevnou grafikou. Barevn\u00e1 paleta nen\u00ed ust\u00e1len\u00e1, jednotliv\u00e9 \u00fapravy dle r\u016fzn\u00fdch autor\u016f produkovaly r\u016fzn\u00e9 kombinace barev podle zvolen\u00e9ho hradlov\u00e9ho kod\u00e9ru.<\/p>\n

Ub880d vymyslel ideu a hardwarov\u00e9 \u0159e\u0161en\u00ed, jak si „vyp\u016fj\u010dit“ dal\u0161\u00ed dva atributov\u00e9 bity ze „sp\u0159\u00e1telen\u00e9ho“ bajtu videoram, \u010d\u00edm\u017e pro dv\u011b \u0161estice pixel\u016f nad sebou m\u016f\u017eeme volit jednu ze 16 barev. Ale proto\u017ee z\u00e1m\u011brem byla i zp\u011btn\u00e1 kompatibilita s m\u00edsen\u00edm barev pomoc\u00ed vizu\u00e1ln\u00edho vjemu, kdy se st\u0159\u00eddaj\u00ed mikro\u0159\u00e1dky dvou z\u00e1kladn\u00edch barev a v\u00fdsledn\u00e1 vn\u00edman\u00e1 barva vznik\u00e1 jejich aditivn\u00edm sm\u00edsen\u00edm, je celkov\u00fd po\u010det barev omezen na osm (v\u010detn\u011b \u010dern\u00e9 barvy).<\/p>\n

A proto\u017ee jsem si danou konstrukci cht\u011bl vyzkou\u0161et p\u0159ed jej\u00ed aplikac\u00ed na desce BGP-1 a pozd\u011bj\u0161\u00ed pl\u00e1novanou reinkarnac\u00ed PMD-85, za\u010dal jsem s modulem pro PMD 85-2A a PMD 85-3. Z po\u010d\u00edta\u010de je nutn\u00e9 vyjmout z patic osm kus\u016f p\u016fvodn\u00edch DRAM 4164 a m\u00edsto nich nasunout uveden\u00fd modul. Modul se p\u0159ipoj\u00ed dv\u011bma a\u017e \u010dty\u0159mi vodi\u010di k z\u00e1kladn\u00ed desce, dal\u0161\u00edmi \u010dty\u0159mi vodi\u010di ke konektoru DIN7 (video) a zb\u00fdvaj\u00edc\u00ed (\u017elut\u00fd) vodi\u010d slou\u017e\u00ed k volb\u011b re\u017eimu 4\/8 barev. V re\u017eimu \u010dty\u0159 barev se vol\u00ed z palety zelen\u00e1-\u010derven\u00e1-modr\u00e1-fialov\u00e1, v re\u017eimu osmi barev (Colorace) jsou k dispozici barvy zelen\u00e1-\u010derven\u00e1-modr\u00e1-fialov\u00e1-\u017elut\u00e1-nebesk\u00e1-b\u00edl\u00e1-\u010dern\u00e1.<\/p>\n

\"\"<\/a>

Sch\u00e9ma zapojen\u00ed<\/p><\/div>\n

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\"\"<\/a>

Modul s integrovan\u00fdmi sign\u00e1ly multiplexeru adres<\/p><\/div>\n

\"\"<\/a>

Modul s extern\u00edmi sign\u00e1ly multiplexeru adres<\/p><\/div>\n

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 <\/p>\n

\"\"<\/a>

Z\u00e1stavba do PMD 85-2A<\/p><\/div>\n

\"\"<\/a>

Z\u00e1stavba do PMD 85-3<\/p><\/div>\n

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

Autorem tohoto roz\u0161\u00ed\u0159en\u00ed pro po\u010d\u00edta\u010de PMD-85 je Ub880d, viz \u010dl\u00e1nek zde. N\u00e1sledn\u011b vy\u0161lo pokra\u010dov\u00e1n\u00ed \u010dl\u00e1nku zde a pozd\u011bj\u0161\u00ed variaci m\u016f\u017eete naj\u00edt i na str\u00e1nk\u00e1ch RM-Teamu. Jinou cestou, ov\u0161em se stejn\u00fdmi v\u00fdsledky a 100% zp\u011btnou kompatibilitou, se dal Zden\u011bk6. A jak toto za\u0159\u00edzen\u00ed funguje? Jeden bajt ve videoram nese u PMD-85 informaci o stavu \u0161esti sousedn\u00edch […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":292,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.pmd85.cz\/index.php?rest_route=\/wp\/v2\/pages\/1566"}],"collection":[{"href":"https:\/\/www.pmd85.cz\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.pmd85.cz\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.pmd85.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pmd85.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1566"}],"version-history":[{"count":8,"href":"https:\/\/www.pmd85.cz\/index.php?rest_route=\/wp\/v2\/pages\/1566\/revisions"}],"predecessor-version":[{"id":1612,"href":"https:\/\/www.pmd85.cz\/index.php?rest_route=\/wp\/v2\/pages\/1566\/revisions\/1612"}],"up":[{"embeddable":true,"href":"https:\/\/www.pmd85.cz\/index.php?rest_route=\/wp\/v2\/pages\/292"}],"wp:attachment":[{"href":"https:\/\/www.pmd85.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}