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字库
字库和图形数字化类似,文字字形也有两种处理方法:点阵式字形和矢量式字形。
DOS操作系统下通常使用的是点阵式字形。标准的西文字符(包括阿拉伯数字)是用8×8个点阵来描述一个字。
如图标出了字符“A”的二进制字形码,每个字符占用8个字节。
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西文“A”的字形编码
汉字字形比较复杂,是方块象形字，在DOS操作系统下显示的通用汉字用16×16点阵描述,一个16×16点阵
需要32个字节，8000多个汉字图形符号需要256K以上的存储空间，在金山汉字系统SPDOS中采用横排列,即每一行左8位,右8位各为一个字节
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01H, |
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02H, |
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04H, |
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08H, |
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60H, |
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