{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","id":"38270854-596f-4a26-8183-db8c968c6020","uuid":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","normalized_title":"编码隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","isbns":["9787121181184","0123456789","6044921875","3039331000","0000000000","0000000000000"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":438,"navigation_url":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020","title_url":"https://workshop.closeclaw.top/ai/title/%E7%BC%96%E7%A0%81%20%E9%9A%90%E5%8C%BF%E5%9C%A8%E8%AE%A1%E7%AE%97%E6%9C%BA%E8%BD%AF%E7%A1%AC%E4%BB%B6%E8%83%8C%E5%90%8E%E7%9A%84%E8%AF%AD%E8%A8%80","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/38270854-596f-4a26-8183-db8c968c6020","page_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/page","search_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/search"},"page":{"printed_page":336,"pdf_page":352,"physical_index":352,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"8416017116d2c62f1628a0de70ebbec16151aefdf41f2bb71eee573f63f61ea7"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"如何确定上面网格中像素的总数呢？你可以去数一下，也可以简单地用320乘以200得出结果64,000。每个像素可以是黑色或白色，或者为某一特定的颜色，这要取决于视频适配器的配置。\n\n现在我们想在显示器上显示出一些文本字符，那么到底能显示出多少呢？很明显，这取决于每个字符所用的像素数。下面是一种可行的方法，每个字符使用8×8的网格（64个像素)。\n\n上图中显示出的字符对应的 ASCII码在20h\\~7Fh区间（在00h\\~1Fh的 ASCII码字符都是无法显示的字符)。\n\n每个字符都被定义为一个7位的ASCI码，但每个字符也与64比特（位）相关，这64比特决定了字符会显示为什么样子。当然，你也可以把这64位信息当做代码看待。\n\n上面我们对字符进行了定义，使用这些定义，分辨率为320×200视频显示器的每一屏就能显示25行、每行40个字符，足够把艾米·洛威尔（AmyLowell，1874-1925）的一首短诗显示出来，看看下面的图。\n\n编码隐匿在计算机软硬件背后的语言\n\n336","previous_page":335,"next_page":337}