说明：  将双字节无符号二进制数转换为压缩 BCD数的子程序。 双字节无符号二进制数的地址放在 R0 中； 存放转换结果（ BCD 数）的地址放在 R1 中。
(The subroutines of converting double byte unsigned binary numbers to compressed BCD numbers. The addresses of double byte unsigned binary numbers are placed in R0. The address that stores the conversion result (BCD number) is placed in R1.)