Z80汇编语言BCD码长浮点常用函数运算子程序库设计成功

• 出 处: 航空精密机械工程
• 发表日期: 1986年04期
• 关键词: 汇编语言 浮点 阶码 程序库 算子 BCD Z80 字节 数据格式 补码

我所最近设计了一套Z80汇编语言长浮点BCD码常用函数运算子程序库。这套子程序采用的数据格式是,阶码和尾符占一个字节,阶码用2的补码表示,尾符O表示正数,1表示负数;尾数占八个字节,每个字节存两位BCD码,所以,数据精度可达16位十进制数。

I recently designed a set of Z80 assembly language long floating point BCD commonly used function operator subroutine library. The data format adopted by this subroutine is that the level code and the tail number occupy one byte, the level code is represented by two’s complement code, the tail symbol O represents a positive number, and the number 1 represents a negative number; the mantissa accounts for eight bytes and each byte Save two BCD code, so the data accuracy of up to 16 decimal digits.