{"id":1701,"date":"2014-09-20T20:05:14","date_gmt":"2014-09-20T18:05:14","guid":{"rendered":"https:\/\/zz-indigo.mavipet.sk\/?p=1701"},"modified":"2019-10-29T18:04:50","modified_gmt":"2019-10-29T18:04:50","slug":"zx81xram-by-pokemon","status":"publish","type":"post","link":"https:\/\/zz-indigo.mavipet.sk\/?p=1701","title":{"rendered":"ZX81Xram by PokeMon"},"content":{"rendered":"

V\u010dera do\u0161la „stavebnica“ pam\u00e4te ZX81XRAM<\/a>, tak\u017ee som nad n\u00edm str\u00e1vil cel\u00fd ve\u010der.<\/p>\n

V ob\u00e1lke bol vytla\u010den\u00fd manu\u00e1l, A s\u00e1\u010dik z PCB a s\u00fa\u010diastkami.Od profesion\u00e1lnych stavebn\u00edc sa to l\u00ed\u0161i len faktom ze to nieje dod\u00e1van\u00e9 v blistri ako v\u00e4\u010d\u0161ina stavebn\u00edc.
\nTo \u010dim sa t\u00e1to pam\u00e4\u0165 l\u00ed\u0161i od ostatn\u00fdch je fakt \u017ee sa „samo konfiguruje“ a\u017e na 32K. A netreba v\u00f4bec zad\u00e1va\u0165 poke na zv\u00e4\u010d\u0161enie RAM pre Basic.<\/p>\n

<\/p>\n

Najprv k realiz\u00e1cii kitu. PCB je e\u0161te z predch\u00e1dzaj\u00facej verzie a preto nesedia niektor\u00e9 popisy na PCB. Napr\u00edklad R2 je na mieste ozna\u010denom R4, R5 ktor\u00fd sa prip\u00e1ja na miesto IC4, \u010di R6 ktor\u00fd nem\u00e1 na PCB umiestnenie a d\u00e1va sa priamo k no\u017ei\u010dk\u00e1m IC2. A tie\u017e je na PCB jeden vodi\u010d preru\u0161en\u00fd. IC1 a IC2 s\u00fa pri sebe moc bl\u00edzko preto odpor\u00fa\u010dam IC1 osadi\u0165 do p\u00e4tice. D\u00f4vodom je fakt \u017ee niektor\u00fd v\u00fdrobcovia nedodr\u017euj\u00fa d\u013a\u017eku DIL p\u00fazdra a treba ho potom jemne obr\u00fasi\u0165. (Tento probl\u00e9m m\u00e1 aj m\u00f4j PCB z C_brainom ke\u010f je CPLD osaden\u00e9 v p\u00e4tici) Ale nejedn\u00e1 sa o ni\u010d nezvy\u010dajn\u00e9 ani v pr\u00edpade komer\u010dn\u00fdch rie\u0161en\u00ed.<\/p>\n

\u010co sa t\u00fdka dokument\u00e1cie, Tak t\u00e1 je uroben\u00e1 ve\u013emi kvalitne v\u010detne popisu ako je rie\u0161en\u00e9 automatick\u00e9 rozozn\u00e1vanie plnej ve\u013ekosti.<\/p>\n

Automatick\u00e9 rozozn\u00e1vanie je rie\u0161en\u00e9 ve\u013emi zauj\u00edmavo. A to „modifik\u00e1ciou“ ROM po\u010das \u010dasu ur\u010denom R2 a C6 sa na adres\u00e1ch\u00a0 XXXXXXXX0XXX100 . Za tento \u010das je to len len 0X0004 Kde je v ROM ulo\u017een\u00e1 horna hranica odkia\u013e sa ma RAM kontrolova\u0165. Tak\u017ee CPU namiesto 0X7F pre\u010d\u00edta 0xFF. Funguje len na origin\u00e1l ZX81 lebo ZX80 nem\u00e1 vyveden\u00fd Disable ROM pin.<\/p>\n

Pokia\u013e namiesto 32K RAM sa pou\u017eije 128-512K RAM\u00a0 by po malej modifik\u00e1cii malo by\u0165 mo\u017en\u00e9 pou\u017ei\u0165 48K. A to preru\u0161en\u00edm prepojenia medzi VCC a pinom 31 IC1 a jeho n\u00e1sledn\u00fdm pripojen\u00edm na\u00a0 A15.<\/p>\n

Pokia\u013e chcete pam\u00e4\u0165 schova\u0165 do krabi\u010dky je potrebn\u00e9 konektor prisp\u00e1jkova\u0165\u00a0 vzdialen\u00fd od PCB. Ja som na to pou\u017eil k\u00fasok plastu z header li\u0161ty ktor\u00fd som prevrtal aby tam \u0161li v\u00fdvody konektorov \u013eahko nasun\u00fa\u0165. Vi\u010f obr\u00e1zok.<\/p>\n

\"Detail<\/a>A nakoniec ako sa mi to podarilo:<\/p>\n

\"Hotov\u00e1<\/a>\"Hotov\u00e1<\/a>\u010co doda\u0165 na z\u00e1ver? Pokia\u013e e\u0161te nem\u00e1te roz\u0161\u00edrenie RAM pre ZX81 \u010di 80. Tak ur\u010dite odpor\u00fa\u010dam. ZX81Xram sa dod\u00e1va ako samotn\u00e9 PCB, kit, Osaden\u00e9 rie\u0161enie, A dokonca aj hotov\u00e9 v krabi\u010dke a to aj v priechodnom preveden\u00ed.<\/p>\n","protected":false},"excerpt":{"rendered":"

V\u010dera do\u0161la „stavebnica“ pam\u00e4te ZX81XRAM, tak\u017ee som nad n\u00edm str\u00e1vil cel\u00fd ve\u010der. V ob\u00e1lke bol vytla\u010den\u00fd manu\u00e1l, A s\u00e1\u010dik z PCB a s\u00fa\u010diastkami.Od profesion\u00e1lnych stavebn\u00edc sa to l\u00ed\u0161i len faktom ze to nieje dod\u00e1van\u00e9 v blistri ako v\u00e4\u010d\u0161ina stavebn\u00edc. To … 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":[3,5,13],"tags":[],"class_list":["post-1701","post","type-post","status-publish","format-standard","hentry","category-hw-a-sw","category-ostatne","category-zx81"],"_links":{"self":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/1701","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=1701"}],"version-history":[{"count":1,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/1701\/revisions"}],"predecessor-version":[{"id":2062,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/1701\/revisions\/2062"}],"wp:attachment":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1701"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1701"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1701"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}