The 10xxxxxx byte is a continuation byte with the XXXXXX bit positions filled with the bits of the character code number in binary representation.
字节10 xxxxxx是一个扩展字节，它的xxxxx x位位置被以二进制表示的字符代码号的位所填充。
The carry from bit3 to bit4 needed for adding packed binary coded decimal number correctly, where two binary coded decimal digits reside in one8-bit byte.
二进制编码的十进制数进行相加所需的从第3位到第4位的进位。
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