Po\u010fme sa teraz spolu pozrie\u0165 \u010do nap\u00edsali o dvoch rivaloch z jednej stajne v \u010dasopise Elektr\u00f3n p\u00e4\u0165 mesiacov pred ne\u017enou revol\u00faciou.
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<\/figure>\n\n\n\nV\u00e4\u010d\u0161ine z v\u00e1s ur\u010dite nie je pojem Didaktik Gama nov\u00fd. V estetickej \u0161katuli s t\u00fdmto n\u00e1zvom je skryt\u00fd mikropo\u010d\u00edta\u010d, ktor\u00fd sa svoj\u00edm vonkaj\u0161\u00edm vzh\u013eadom ve\u013emi podob\u00e1 na Sinclair Spectrum +. Je to k\u00f3pia tohto mikropo\u010d\u00edta\u010da alebo nie? \u010co sa stane, ke\u010f vymen\u00edme na stole u\u017e rozlo\u017een\u00fd Sinclair za Didaktik? Po chv\u00edli zist\u00edme, \u017ee tieto dva mikropo\u010d\u00edta\u010de nie s\u00fa \u00faplne kompatibiln\u00e9. Pre\u010do?<\/strong> Pri n\u00e1vrhu mikropo\u010d\u00edta\u010da kon\u0161trukt\u00e9ri ve\u013emi dobre vyu\u017eili to, \u017ee \u00faspech u \u0161irokej verejnosti bude ma\u0165 len ten v\u00fdrobok, pri ktorom pou\u017eij\u00fa kon\u0161truk\u010dn\u00e9 prvky dom\u00e1cej produkcie. Pri porovn\u00e1van\u00ed kladov a z\u00e1porov mikropo\u010d\u00edta\u010da Didaktik Gama vo\u010di mikropo\u010d\u00edta\u010du Sinclair Spectrum treba bra\u0165 do \u00favahy, \u017ee medzi mlad\u00fdmi pou\u017e\u00edvate\u013emi je pribli\u017ene rovnak\u00fd po\u010det majite\u013eov verzie Spectrum + a star\u0161ej (gumenej) verzie.<\/p>\n\n\n\n Ak za\u010dneme porovn\u00e1vat mikropo\u010d\u00edta\u010de pod\u013ea vonkaj\u0161ieho vzh\u013eadu sie\u0165ov\u00e9ho nap\u00e1jania, zist\u00edme, \u017ee obidva zdroje s\u00fa zhodn\u00e9 \u2013 u Didaktiku je rozmerovo trocha v\u00e4\u010d\u0161\u00ed, av\u0161ak vo vn\u00fatri skr\u00fdva poistku, \u010do by u tak\u00e9ho drah\u00e9ho pr\u00edstroja mala by\u0165 samozrejmos\u0165.<\/p>\n\n\n\n Nezvykl\u00fdm rie\u0161en\u00edm je spojenie nap\u00e1jania a v\u00fdvodu pre magnetof\u00f3n do jedn\u00e9ho konektoru. Pravdu maj\u00fa v\u0161etci, ktor\u00ed tvrdia, \u017ee toto miesto m\u00f4\u017ee by\u0165 zdrojom por\u00fach ak sa konektor \u010dastou manipul\u00e1ciou uvoln\u00ed. Na druhej strane sme presved\u010den\u00ed, \u017ee toto rie\u0161enie je lep\u0161ie ako dva samostatn\u00e9 konektory \u2013 jeden pre nap\u00e1janie a druh\u00fd pre magnetof\u00f3n.<\/p>\n\n\n\n Tak isto pou\u017eitie konektoru DIN na pripojenie magnetof\u00f3nu oproti 3,5 mm jack-om u Sinclairu mo\u017eno hodnoti\u0165 ako v\u00fdhodu, najm\u00e4 pre pou\u017e\u00edvate\u013eov, ktor\u00ed si u\u017e predt\u00fdm k\u00fapili kazetov\u00fd magnetof\u00f3n \u010deskoslovenskej v\u00fdroby. Spom\u00ednan\u00fdm spojen\u00edm sa zdanlivo zmen\u0161il po\u010det vodi\u010dov v porovnan\u00ed so Sinclairom.<\/p>\n\n\n\n Pri porovn\u00e1van\u00ed kl\u00e1vesnice treba uzna\u0165, \u017ee vonkaj\u0161\u00edm v\u00fdzorom a aj kvalitou chodu zaost\u00e1va za profesion\u00e1lnej\u0161\u00edm v\u00fdzorom kl\u00e1vesnice \u201epluska\u201c, ale ak ju porovn\u00e1me s kl\u00e1vesnicou star\u0161ieho modelu, tak kl\u00e1vesnica Gamy je ur\u010dite lep\u0161ia a bude ma\u0165 v\u00e4\u010d\u0161iu \u017eivotnos\u0165.<\/p>\n\n\n\n Ur\u010ditou nev\u00fdhodou kl\u00e1vesnice Didaktiku m\u00f4\u017ee by\u0165 to, \u017ee sp\u00f4sob rozmiestnenia jednotliv\u00fdch kl\u00e1ves je rovnak\u00fd ako u star\u0161ieho typu Sinclairu, \u010do sa prejavuje komplikovanej\u0161\u00edm prep\u00ednan\u00edm jednotliv\u00fdch re\u017eimov, ovl\u00e1dan\u00edm kurzoru, medzery (ktor\u00e1 je umiestnen\u00e1 ne\u0161tandardne) a vymaz\u00e1vanim znakov.<\/p>\n\n\n\n Na pravej strane kl\u00e1vesnice s\u00fa vhodne umiestnen\u00e9 dve indika\u010dn\u00e9 LED di\u00f3dy a tla\u010didlo RESET.<\/p>\n\n\n\n Pri porovn\u00e1van\u00ed v\u00fdvodov syst\u00e9mov\u00e9ho konektora zist\u00edme, \u017ee nie v\u0161etky v\u00fdvody Didaktiku Gama sa zhoduj\u00fa so zapojen\u00edm v\u00fdvodov Sinclairu. Preto pozor! Ak chcete pripojit perif\u00e9rne zariadenie, ktor\u00e9 s mikropo\u010d\u00edta\u010dom Sinclair Spectrum spo\u013eahlivo funguje, nemus\u00ed spolupracova\u0165 s Didaktikom Gama.<\/p>\n\n\n\n U Gamy nie s\u00fa vyveden\u00e9 nap\u00e4tia +12 V, +9 V, -5 V, -12 V a ani v\u00fdstup ozna\u010den\u00fd VIDEO. Zapojenie ostatn\u00fdch v\u00fdvodov sa zhoduje. Pri poh\u013eade do vn\u00fatra Didaktiku Gama vidno, \u017ee kapacita pam\u00e4te RWM je zv\u00e4\u010d\u0161en\u00e1 na 80 kB a navy\u0161e je pridan\u00fd jeden vstupno-v\u00fdstupn\u00fd obvod 8255.<\/p>\n\n\n\n Pre zauj\u00edmavos\u0165 pri osadzovan\u00ed pam\u00e4\u0165ov\u00fdch buniek s adresami 8000H a\u017e FFFFH sa u Sinclairu s v\u00fdhodou pou\u017e\u00edvali chybn\u00e9 \u010dipy 64 kilobitov\u00fdch pam\u00e4t\u00ed, z ktor\u00fdch sa vyu\u017e\u00edvala iba polovica kapacity, t. j. 32 kilobitov. Samozrejme, bolo treba v\u017edy vyh\u013eada\u0165 tak\u00fdch 8 pam\u00e4t\u00ed, ktor\u00e9 mali chybn\u00e9 bunky v rovnakom adresnom priestore a tieto potom pou\u017ei\u0165. So zmenou adresovania t\u00fdchto \u010dipov sa po\u010d\u00edtalo u\u017e pri n\u00e1vrhu Sinclairu a na plo\u0161nom spoji s\u00fa pre tento \u00fa\u010del umiestnen\u00e9 dve dr\u00f4tov\u00e9 prepojky na prepojovanie adresn\u00e9ho vodi\u010da A14 a na trval\u00e9 pripojenie adresn\u00e9ho vodi\u010da A15 na o alebo 1. Ke\u010f\u017ee v \u010ceskoslovensku sa pam\u00e4te s v\u00fdskytom chybn\u00fdch buniek vyra\u010fuj\u00fa u\u017e vo v\u00fdrobe a nie s\u00fa pr\u00edstupn\u00e9 na trhu, v\u00fdrobca pri osadzovan\u00ed Didaktiku Gama pou\u017eil \u010dipy, pri ktor\u00fdch mo\u017eno adresova\u0165 v\u0161etky bunky pam\u00e4te. V mape pam\u00e4te Didaktiku Gama sa to potom prejav\u00ed existenciou dvoch rovnocenn\u00fdch pam\u00e4\u0165ov\u00fdch baniek. Adresne s\u00fa umiestnen\u00e9 v priestore od 8000H do FFFFH. Spr\u00edstupnenie jednej alebo druhej pam\u00e4\u0165ovej banky je cez bit 0 br\u00e1ny C vstupno-v\u00fdstupn\u00e9ho obvodu 8255.<\/p>\n\n\n\n Upozor\u0148ujeme aj na nieko\u013eko nejasnost\u00ed, ku ktor\u00fdm m\u00f4\u017ee dojs\u0165 pri pre\u010d\u00edtan\u00ed pr\u00edru\u010dky pre Didaktik Gama. V prvom rade si treba uvedomi\u0165, \u017ee pridan\u00edm d’al\u0161ej pam\u00e4\u0165ovej banky s kapacitou 32 kB sa interpreta\u010dn\u00e9 mo\u017enosti jazyka BASIC nijako nezv\u00e4\u010d\u0161ili. Pri prep\u00ednan\u00ed jednotliv\u00fdch \u010dast\u00ed pam\u00e4te sa pren\u00e1\u0161a syst\u00e9mov\u00fd z\u00e1sobn\u00edk, \u010do sa navonok prejavi, ako keby sa pou\u017e\u00edvala t\u00e1 ist\u00e1 \u010das\u0165 pam\u00e4te.<\/p>\n\n\n\n Pok\u00fdm pou\u017e\u00edvate\u013e vyu\u017e\u00edva tieto pam\u00e4\u0165ov\u00e9 banky v strojovom k\u00f3de, m\u00f4\u017ee ich vyu\u017e\u00edva\u0165 (obe \u010dasti) osobitne.<\/p>\n\n\n\n Kto chce programovo prep\u00edna\u0165 pam\u00e4\u0165ov\u00e9 banky, mus\u00ed zabezpe\u010di\u0165 ovl\u00e1danie bitu PC0 vstupno-v\u00fdstupn\u00e9ho obvodu 8255. Na to treba myslie\u0165 pri v\u00fdpo\u010dte adresy br\u00e1ny C, preto\u017ee v\u00fdrobca v ,,N\u00e1vode k obsluhe“ ud\u00e1va pr\u00edkaz na prep\u00ednanie s adresou registra riadiaceho slov\u00e1 obvodu 8255. Pri nastavovan\u00ed br\u00e1ny C na vstupn\u00fa, mikropo\u010d\u00edta\u010d sa spr\u00e1va tak, ako keby bol generovan\u00fd sign\u00e1l RESET. Pri porovnan\u00ed tabulky syst\u00e9mov\u00fdch premenn\u00fdch zist\u00edme ich rovnak\u00e9 rozmiestnenie pri obidvoch po\u010d\u00edta\u010doch. Didaktik Gama m\u00e1 navy\u0161e obsaden\u00fa bunku s adresou 23681, kde je ulo\u017een\u00fd po\u010det znakov na riadok pre spolupr\u00e1cu s tla\u010diar\u0148ou.<\/p>\n\n\n\n Ve\u013ekou v\u00fdhodou je pr\u00edtomnos\u0165 paraleln\u00e9ho rozhrania pre spolupr\u00e1cu s tla\u010diar\u0148ou alebo in\u00fdm perif\u00e9rnym zariaden\u00edm, napr. A\/\u010c prevodn\u00edkom. Kv\u00f4li zjednodu\u0161eniu pripojenia perif\u00e9rneho zariadenia s\u00fa na vstupno-v\u00fdstupnom konektore vyveden\u00e9 tri invertory. Na druhej strane nev\u00fdhodou Didaktiku Gama je, \u017ee nem\u00f4\u017ee pracova\u0165 s perif\u00e9rnymi zariadeniami typu mikrodrive a to preto, lebo nie s\u00fa vyveden\u00e9 nap\u00e4tia sa syst\u00e9mov\u00fd konektor a doteraz neboli implementovan\u00e9 pr\u00edkazy na pr\u00e1cu s t\u00fdmto zariaden\u00edm.<\/p>\n\n\n\n Na z\u00e1ver mo\u017eno kon\u0161tatova\u0165, \u017ee mikropo\u010d\u00edta\u010d Didaktik Gama mo\u017eno pou\u017ei\u0165 vo v\u0161etk\u00fdch pr\u00edpadoch rovnocenne namiesto mikropo\u010d\u00edta\u010da Sinclair Spectrum aj Sinclair Spectrum +. V\u00fdrobca i pou\u017e\u00edvatelia by sa mali orientova\u0165 na opera\u010dn\u00fd syst\u00e9m CP\/M, pre ktor\u00fd m\u00e1 Didaktik Gama omnoho lep\u0161ie predpoklady ako Sinclair Spectrum.<\/p>\n\n\n\n Ing. A. STRAKA<\/p>\n\n\n\n Elektr\u00f3n 6\/1989, strana 39 Dnes nie\u010do k p\u00f4vodnej t\u00e9matike blogu aj ke\u010f s nep\u00f4vodn\u00fdm \u010dl\u00e1nkom.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5],"tags":[],"class_list":["post-930465","post","type-post","status-publish","format-standard","hentry","category-tema-2-hardware-php"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5aqy8-3U3v","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts\/930465","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=930465"}],"version-history":[{"count":6,"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts\/930465\/revisions"}],"predecessor-version":[{"id":930476,"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts\/930465\/revisions\/930476"}],"wp:attachment":[{"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=930465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=930465"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=930465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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