{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fna6ko.hatenadiary.jp%2Fentry%2F20180226%2Fp1\" title=\" CD-ROM2 \u306e ADPCM \u7528(\u306b\u3082\u3064\u304b\u3048\u308b) RAM \u306e\u8ee2\u9001\u305d\u306e3 - naruko\u306e\u958b\u767a\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2018-02-26 00:00:00","version":"1.0","author_url":"https://blog.hatena.ne.jp/na6ko/","height":"190","provider_name":"Hatena Blog","blog_title":"naruko\u306e\u958b\u767a\u30e1\u30e2","author_name":"na6ko","image_url":null,"blog_url":"https://na6ko.hatenadiary.jp/","description":"\u5225\u4ef6\u306e\u4fee\u6b63\u3067\u3059.\u4e3b\u306b CD-ROM \u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u304b\u3089 ADPCM \u7528 RAM \u3092\u66f8\u3044\u3066\u3057\u307e\u3048\u308b DMA \u3068\u547c\u3070\u308c\u3066\u3044\u308b\u3084\u3064\u3067\u3059. \u7b49\u5e45\u306b\u66f8\u3044\u3066\u3042\u308b\u90e8\u5206\u306e\u5de6\u7aef\u306e\u6570\u5024\u306f 6280 \u304b\u3089\u306e\u7d76\u5bfeaddress 0x1ff80x \u306e\u7565\u8a18,\u305d\u306e\u6b21\u304c\u305d\u3053\u306b\u66f8\u304b\u308c\u308b data \u3067\u4e26\u3076\u5834\u5408\u306f\u9023\u7d9a\u3067\u66f8\u304b\u308c\u307e\u3059. bios, DMA, write pointer \u521d\u671f\u5316\u3042\u308a \u5148\u65e5\u306e\u8a18\u8f09\u3068\u540c\u3058\u3067\u3059. 8 xx 9 xx d 3,2,0 1 81 08 xx xx xx xx 00 b 2 (loading) b 0 d = 3 \u306e\u6642\u70b9\u3067 write pointer \u3092\u66f4\u65b0\u3057\u307e\u3059, \u305d\u306e\u5f8c\u306e 2, 0 \u306f\u610f\u5473\u304c\u3042\u308b\u306e\u304b\u2026","categories":[],"url":"https://na6ko.hatenadiary.jp/entry/20180226/p1","type":"rich","provider_url":"https://hatena.blog","title":" CD-ROM2 \u306e ADPCM \u7528(\u306b\u3082\u3064\u304b\u3048\u308b) RAM \u306e\u8ee2\u9001\u305d\u306e3","width":"100%"}