most significant character
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而最高位为1的另128个字符(80h—ffh)被称为“扩展ascii”，一般用来存放英文的制表符、部分音标字符等等的一些其它符号。
The highest bit is 1 the other 128 characters (80h-ffh) is called "extended ASCII", usually used to store the English tabs, part of the phonetic characters, and so some of the other symbols.
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