{"id":1993,"date":"2023-08-08T10:29:36","date_gmt":"2023-08-08T08:29:36","guid":{"rendered":"https:\/\/www.pmd85.cz\/?page_id=1993"},"modified":"2024-12-01T19:23:15","modified_gmt":"2024-12-01T18:23:15","slug":"sapi-deska-pameti-ram-1v-rev-1-0","status":"publish","type":"page","link":"https:\/\/www.pmd85.cz\/?page_id=1993","title":{"rendered":"SAPI – deska pam\u011bti RAM-1V rev. 1.1"},"content":{"rendered":"
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RAM-1V rev. 1.1<\/p><\/div>\n

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Deska umo\u017e\u0148uje za\u010dlenit do syst\u00e9mu 64kB z\u00e1kladn\u00ed pam\u011bti RAM v rozsahu 0000h a\u017e FFFFh. Krom\u011b toho lze pomoc\u00ed syst\u00e9mu mapov\u00e1n\u00ed sign\u00e1lem MAP1 (nebo MAP2) doplnit do syst\u00e9mu dal\u0161\u00edch 32kB, kde lze vyu\u017e\u00edt obvod\u016f TIMEKEEPER a doplnit tak syst\u00e9m o z\u00e1lohovanou pam\u011b\u0165 RAM 32kB a hodiny re\u00e1ln\u00e9ho \u010dasu.<\/p>\n

V pam\u011b\u0165ov\u00e9m prostoru lze zablokovat a\u017e dv\u011b nez\u00e1visl\u00e9 oblasti. Prvn\u00ed, o velikosti 2kB, je ur\u010dena pro p\u0159ekryt\u00ed videoram grafick\u00e9 karty typu AND-1. Druh\u00e1, o velikosti 16kB, je ur\u010dena pro karty DGD-1 a BGP-1. Blokace obou pam\u011b\u0165ov\u00fdch lokac\u00ed m\u016f\u017ee b\u00fdt nepodm\u00edn\u011bn\u00e1, pop\u0159\u00edpad\u011b podm\u00edn\u011bn\u00e1 v\u00fdskytem sign\u00e1lu MAP1 \u010di MAP2.<\/p>\n

Deska rovn\u011b\u017e obsahuje gener\u00e1tor mapovac\u00edch sign\u00e1l\u016f MAP1 a MAP2, kde si lze nastavit adresu IO registru pro z\u00e1pis t\u011bchto sign\u00e1l\u016f a jejich bitovou pozici.<\/p>\n

RAM-1V lze nakonfigurovat jako funk\u010dn\u00ed n\u00e1hradu t\u011bchto origin\u00e1ln\u00edch pam\u011b\u0165ov\u00fdch desek syst\u00e9mu SAPI-1:<\/p>\n