two-bit byte 二个二进制位字节
The two values are concatenated, and the five-bit value is used as the byte index of the concatenated value.
这两个值被串接在一起，5位值用作所串接的值的字节索引。
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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